WO2013068834A1 - Method and apparatus for transmitting and receiving downlink control information based on multi-user mimo transmission - Google Patents

Method and apparatus for transmitting and receiving downlink control information based on multi-user mimo transmission Download PDF

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Publication number
WO2013068834A1
WO2013068834A1 PCT/IB2012/002425 IB2012002425W WO2013068834A1 WO 2013068834 A1 WO2013068834 A1 WO 2013068834A1 IB 2012002425 W IB2012002425 W IB 2012002425W WO 2013068834 A1 WO2013068834 A1 WO 2013068834A1
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Prior art keywords
groups
information
downlink control
user equipments
scheduling indication
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PCT/IB2012/002425
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French (fr)
Inventor
Jianguo A. LIU
Zheng C. LIU
Qi A. JIANG
Dongyao Wang
Gang A. SHEN
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Alcatel Lucent
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Publication of WO2013068834A1 publication Critical patent/WO2013068834A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

Definitions

  • Embodiments of the present invention generally relate to the field of wireless communication technology. More specifically, embodiments of the present invention relate to a method and apparatus for transmitting and receiving downlink control information based on multi-use MIMO transmission. Background of the Invention
  • a physical downlink control channel allocates various resources to uplink/downlink transmission of the whole communication system and thus plays a crucial role in system scheduling.
  • the PDCCH capacity limitation has a significant influence on the overall MU-MIMO and CoMP performance.
  • MU-MIMO transmission many user equipments (UEs) have to be scheduled in the same subframe to expect MU-MIMO gains; however, the current PDCCH merely includes a limited number of control channel elements (CCEs), and almost half of these CCEs are reserved for uplink (UL) grants.
  • CCEs control channel elements
  • downlink control overhead reduction is primarily achieved by reducing the size of the downlink control information (DCI) formats for physical downlink shared channel (PDSCH) and physical uplink shared channel (PUSCH) scheduling.
  • DCI downlink control information
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • multiple PDCCHs having a corresponding DCI format will be used for all paired UEs that occupy a same resource block.
  • many domains or fields for example, allocation of resource blocks (RBs) and carrier indication
  • each PDCCH channel is attached with a 16-bit cyclic redundancy check (CRC). All of these settings will consume too many overheads and severely degrade the delivery efficiency of DCI messages.
  • multi-user interference In MU-MIMO transmission, multi-user interference (MUI) would arise if no sufficient spatial orthogonality exists among scheduled multiple users. Due to lack of knowledge of interference caused by other UEs scheduled simultaneously, the UEs affected by the MUI would experience loss of transmission performance. If the grouped or paired users can know the MUI information of other UEs in the group or pair (such as the pre-coding or channel state information), the UE can select an appropriate receiver algorithm to perform MUI suppression.
  • MUI multi-user interference
  • the prior art needs a method and apparatus for transmitting DCI based on MU-MIMO transmission.
  • DL control overheads can be reduced, thereby enhancing the overall performance of the communication system; further, MUI suppression can be realized, thereby improving UE transmission rate and system throughput.
  • one aspect of the present invention provides a method for transmitting downlink control information based on multi-user MIMO transmission, comprising:
  • radio network temporary group identifiers for identifying the groups and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups ;
  • downlink control information to the respective user equipments within the one or more groups, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups, and the common scheduling indication information and specific scheduling indication information is obtained by the user equipment from the downlink control information through the radio network temporary group identifiers and the intra-group user equipment-specific identifiers.
  • the method further comprises, based on the channel state information received from the multiple user equipments, partitioning the user equipments into one or more groups participating in the multi-user MIMO transmission.
  • the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation for the respective user equipments within the groups.
  • the specific scheduling indication information at least comprises a transmit power control command, a new data indication, a hybrid automatic repeat request process number, and data demodulation reference signal configuration information, all of which are specific to respective user equipments within the groups
  • the method further comprising: performing an operation of producing data demodulation reference signals for the respective user equipments based on the radio network temporary group identifiers and the data demodulation reference signal configuration information of the respective user equipments within the groups.
  • the method further comprises: performing a scrambling operation to cyclic redundancy check information in the downlink control information using the radio network temporary group identifiers; and transmitting the downlink control information attached with the scrambled cyclic redundancy check information to the respective user equipments within the one or more groups.
  • Another aspect of the present invention provides a method of receiving downlink control information based on multi-user MIMO transmission, comprising:
  • radio network temporary group identifiers for identifying one or more groups participating in the multi-user MIMO transmission and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups as transmitted by a base station;
  • the base station receiving downlink control information transmitted by the base station, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups;
  • the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation for the respective user equipments within the groups.
  • the specific scheduling indication information at least comprises a transmit power control command, a new data indication, a hybrid automatic repeat request process number, and data demodulation reference signal configuration information, all of which are specific to respective user equipments within the groups
  • the method further comprising: performing a demodulation operation to a data demodulation reference signal based on the radio network temporary group identifiers and the data demodulation reference signal configuration information of the respective user equipments within the group; estimating multi-user interference from other user equipments within the group during the multi-user MIMO transmission based on the data demodulation reference signal; and selecting a receiver algorithm suppressing the multi-user interference based on the estimated multi-user interference.
  • One aspect of the present invention further provides an apparatus for transmitting downlink control information based on multi-user MIMO transmission, comprising:
  • a module configured to transmit, to respective user equipments within one or more groups participating in multi-user MIMO transmission, radio network temporary group identifiers for identifying the groups and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups ;
  • a module configured to transmit downlink control information to the respective user equipments within the one or more groups, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups, and the common scheduling indication information and specific scheduling indication information is obtained by the user equipment from the downlink control information through the radio network temporary group identifiers and the intra-group user equipment-specific identifiers.
  • a still further aspect of the present invention further provides an apparatus for receiving downlink control information based on multi-user MIMO transmission, comprising:
  • a module configured to receive radio network temporary group identifiers for identifying one or more groups participating in the multi-user MIMO transmission and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups as transmitted by a base station; a module configured to receive downlink control information transmitted from the base station, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups; and
  • a module configured to obtain the common scheduling indication information and the specific scheduling indication information from the downlink control information through the radio network temporary group identifier and the intra-group user equipment specific identifiers.
  • Various aspects of the present invention further provide a base station and user equipment comprising the above apparatuses, respectively.
  • the novel compact DCI format design reduces the DL control signaling overheads during MU-MIMO transmission; further, the present DCI format design is compatible with the existing DCI format. Further, because each UE in the group can estimate MUl based on the MUl information of other UEs as provided by the DCI of the present invention, the MUl can be effectively suppressed using an appropriate receiver algorithm.
  • Fig. 1 schematically illustrates a flow chart of a method of transmitting DCI based on MU-MIMO transmission according to one embodiment of the present invention
  • Fig. 2 schematically illustrates a flow chart of a method of receiving DCI based on MU-MIMO transmission according to another embodiment of the present invention
  • Fig. 3 schematically illustrates a structural diagram of DCI according to one embodiment of the present invention
  • Fig. 4 schematically illustrates a detailed flow chart of a method of transmitting and receiving DCI based on MU-MIMO transmission according to one embodiment of the present invention
  • Fig. 5 schematically illustrates a block diagram of an apparatus for transmitting DCI based on MU-MIMO transmission according to one embodiment of the present invention
  • Fig. 6 schematically illustrates a block diagram of an apparatus for receiving DCI based on MU-MIMO transmission according to another embodiment of the present invention
  • Fig. 7 shows performance estimation on user rates as achieved by the methods and apparatuses according to the present invention compared with the prior art in an exemplary simulation scenario.
  • the basic idea of the present invention is to improve the structure of the existing DCI so as to effectively reduce DL control signaling overheads in the MU-MIMO/CoMP transmission and meanwhile utilize the information comprised in the improved DCI to realize effective suppression to the MUI.
  • the BS allocates to respective UEs in the same group a radio network temporary group identifier (g-RNTI) identifying the group and intra-group UE-specific identifiers (for example, in the form of serial numbers) for identifying respective UEs.
  • g-RNTI radio network temporary group identifier
  • intra-group UE-specific identifiers for example, in the form of serial numbers
  • the BS transmits a new formatted DCI to respective UEs, the DCI comprising the same common scheduling indication information among respective UEs and specific scheduling indication information specific to respective UEs within the group.
  • the scheduling indication information is obtained from the DCI using the previously received identification for transmission scheduling and MUI suppression.
  • Fig. 1 illustrates a flow chart of a method 100 of transmitting DCI based on MU-MIMO transmission according to one embodiment of the present invention.
  • the method 100 starts with step SI 01.
  • the method 100 transmits, to respective user equipments within one or more groups participating in multi-user MIMO transmission, g-RNTIs for identifying the groups and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups.
  • the transmission may be implemented through higher- layer signaling (for example, radio resource control (RRC) signaling) or layer- 1 signaling.
  • RRC radio resource control
  • the BS may partition multiple UEs into one or more groups participating into MU-MIMO transmission based on channel state information (CSI) received from multiple UEs.
  • CSI channel state information
  • Multiple UEs within the same group will perform MU-MIMO transmission on the same time-frequency resource, while different multiple groups will perform MU-MIMO transmission on different time-frequency resources.
  • the intra-group UE-specific identifiers may be serial numbers associated with g-RNTI. For example, when the group has four UEs, serial numbers 0, 1, 2, and 3 may be respectively allocated to the four UEs for identifying the four UEs.
  • step S I 03 the method 100 transmits DCI to respective UEs within one or more groups, the DCI comprising common scheduling indication information for the groups and specific scheduling indication information for respective UEs within the groups, and the common scheduling indication information and the specific scheduling indication information is obtained by the UE from the DCI through the above-mentioned g-RNTI and intra-group UE-specific identifiers.
  • the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation for the respective UEs within the groups.
  • the aforementioned specific scheduling indication information at least comprises a transmit power control command (TPC), a new data indication (NDI), a hybrid automatic repeat request (HARQ) process number, and data demodulation reference signal (DMRS) configuration information, all of which are specific to respective user equipments within the groups,
  • the method 100 may further comprise performing an operation of producing DMRS for respective UEs based on g-RNTI and DMRS configuration information of respective UEs within the groups.
  • the method 100 may further comprise performing a scrambling operation to the CRC information of DCI using g-RNTI, and transmitting the DCI attached with scrambled CRC information to respective UEs within one or more groups.
  • Fig. 2 schematically illustrates a flow chart of a method 200 of receiving DCI based on MU-MIMO transmission according to another embodiment of the present invention.
  • the method 200 starts with step S201.
  • the method 200 receives g-RNTI for identifying one or more groups participating in MU-MIMO transmission and intra-group UE-specific identifiers for identifying respective UEs within the groups as transmitted by a BS.
  • the receiving may be implemented through, for example, RRC higher-layer signaling or Layer- 1 signaling.
  • the method 200 receives the DCI transmitted from the BS, wherein the DCI comprises common scheduling indication information for the groups and specific scheduling indication information for respective UEs within the groups.
  • the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation information for respective UEs within the group
  • the specific scheduling indication information at least comprises a TPC command, a NDI, a HARQ process number and DMRS configuration information, all of which are specific to respective UEs within the group.
  • step S203 After completion of step S203, the method 200 proceeds to step S204.
  • the method proceeds to step S204.
  • step S205 the method 200 obtains the common scheduling indication information and specific scheduling indication information from the DCI through the g-RNTI and the intra-group UE-specific identifiers. Finally, the method 200 ends in step S205.
  • the method 200 may further comprise performing an operation of demodulating DMRS based on the g-RNTI and the DMRS configuration information of respective UEs within the group.
  • the method 200 estimates MUI from other UEs within the group during the MU-MIMO transmission based on the DMRS and selects a receiver algorithm suppressing the MUI based on the estimated MUI.
  • the method 200 may further comprise receiving the DCI attached with g-RNTI-scrambled CRC information; performing a descrambling operation to the scrambled CRC information utilizing g-RNTI; and performing a check operation to the DCI based on the descrambled CRC information.
  • DCI with a new format is received at the UE, which can reduce downlink control signaling overheads caused by repetitively receiving the common indication information with the same content and CRC information that is attached for multiple times. Further, by estimating the interference information from other UEs during MU-MIMO transmission, an appropriate receiver algorithm can be selected, thereby performing effective suppression to MUI. Because those skilled in the art may perform MUI suppression based on the obtained DMRS information through various appropriate methods or approaches (for example, advanced-minimum mean square error estimation algorithm), these methods or approaches will not be detailed here so as to avoid unnecessarily confusing the present invention.
  • Fig. 3 schematically illustrates a structural diagram of DCI according to one embodiment of the present invention.
  • the DCI according to the embodiments of the present invention comprises two portions, i.e., the common signaling field or domain for the group (i.e., common scheduling indication information) and UE-specific signaling fields or domains for user 1 and user 2 within the group (i.e., specific scheduling indication information for respective UEs within the group). It may be seen from Fig.
  • the common signaling field at least comprises a carrier indication and a resource block allocation
  • the UE-specific signaling fields for user 1 and user 2 at least comprise: a TPC command, a HARQ process number, DMRS configuration information (an antenna port, a scrambling identifier, and a number of layers indication) and link adaptive information for transmission block 1 and transmission block 2, respectively, comprising a modulation coding scheme (MCS), a NDI, and a HArQ redundancy version (RV).
  • MCS modulation coding scheme
  • RV HArQ redundancy version
  • Fig. 4 schematically illustrates a detailed flow chart of a method 400 of transmitting and receiving DCI based on MU-MIMO transmission according to one embodiment of the present invention.
  • the method 400 starts at step S401 , wherein multiple UEs transmit their own CSIs to the BS.
  • the BS partitions multiple UEs into one or more groups based on the received CSI.
  • the BS transmits identification information to UEs in respective groups through RRC signaling or Layer 1 signaling, and the identification information comprises the g-RNTIs for identifying the groups and the intra-group UE-specific identifiers for identifying respective UEs within the group, as discussed before.
  • the BS forms a new DCI according to the present invention based on the results of scheduling and resource allocation decisions, the DCI having the aforementioned structure, i.e., comprising the common scheduling indication information for the groups and the specific scheduling indication information for respective UEs within the groups.
  • the BS scrambles the CRC information for the DCI using the g-RNTI and attaching the scrambled CRC information to the DCI.
  • the process proceeds to step S406.
  • the BS produces DMRS based on g-RNTI and DMRS configuration information.
  • step S407 the BS transmits the DCI of a new format to respective UEs within respective groups and DMRS (for example, through the existing PDCCH domain or enhanced PDCCH (ePDCCH) domain).
  • Execution of the above steps of method 400 performs the processing at the BS side.
  • the method 400 enters the processing flow at the UE side.
  • step S408 the UE decodes the DCI through searching a UE-specific search space utilizing the previously received g-RNTI, wherein the step comprises performing a descrambling operation to the CRC utilizing the g-RNTI and performing a check operation to the received DCI utilizing the CRC information.
  • step S409 the UE reads the common scheduling indication information and specific scheduling indication information utilizing the received g-RNTI and its own specific identifier, so as to perform subsequent DMRS demodulations and PDSCH demodulations.
  • step S410 based on the obtained DMRS configuration information of the UE and other UEs in the group, demodulation operations are performed to the DMRS of the UE and of the other UEs in the group.
  • the MUI information for example, precoding or CSI information
  • the UE may select an appropriate receiver algorithm based on the obtained interference information so as to suppress the MUI.
  • the UE may select an advanced-minimum mean square error (MMSE) receiver algorithm to perform PDSCH decoding to thereby suppress MUI.
  • MMSE advanced-minimum mean square error
  • a DCI with a new format reduces downlink control signaling overheads caused by repetitively transmitting the common indication information with the same content and CRC information that is attached for multiple times. Meanwhile, by estimating the interference information from other UEs during MU-MIMO transmission, the UE may pre-select an appropriate receiver algorithm, thereby performing effective suppression to MUI.
  • the above flow sequence is merely exemplary, and without departing from the teaching of the present invention, those skilled in the art may vary it as required.
  • Fig. 5 schematically illustrates a block diagram of an apparatus 500 for transmitting DCI based on MU-MIMO transmission according to one embodiment of the present invention.
  • the apparatus 500 comprises a first transmitting module 501 and a second transmitting module 502.
  • the first transmitting module 501 is configured to transmit, to respective UEs within one or more groups participating in MU-MIMO transmission, g-RNTIs for identifying the groups and intra-group UE-specific identifiers for identifying the respective UEs within the groups (i.e., performing step S 102 in the method 100);
  • the second transmitting module 502 is configured to transmit DCI to respective UEs within the one or more groups, wherein the DCI comprises common scheduling indication information for the groups and specific scheduling indication information for respective UEs within the groups, and the common scheduling indication information and the specific scheduling indication information is obtained by the UE from the DCI through the g-R TIs and intra-group UE-specific identifiers (i.e., performing step SI 03 in the
  • Fig. 6 schematically illustrates a block diagram of an apparatus 600 for transmitting DCI based on MU-MIMO transmission according to another embodiment of the present invention.
  • the apparatus 600 comprises a first receiving module 601, a second receiving module 602, and an obtaining module 603.
  • the first receiving module 601 is configured to receive g-RNTI for identifying one or more groups participating in MU-MIMO transmission and intra-group UE-specific identifiers for identifying respective UEs within the groups as transmitted by a BS (i.e., performing step S202 in the method 200);
  • the second receiving module 602 is configured to receive the DCI transmitted by the BS, wherein the DCI comprises common scheduling indication information for the groups and specific scheduling indication information for respective UEs within the groups (i.e., performing step S203 in the method 200);
  • the obtaining module 603 is configured to obtain the common scheduling indication information and specific scheduling indication information from the DCI through the g-RNTI and the intra-group UE-specific identifiers (i.e., performing step S204 in the method 200). It may be seen that the apparatus 200 shown in Fig. 2 may be performed by implementing the apparatus 600.
  • Fig. 7 shows performance estimation on user rates as achieved by the methods and apparatuses according to the present invention compared with the prior art in an exemplary simulation scenario.
  • each cell has 25 UEs in the exemplary simulation scenario, each BS having 4 antennas, each UE having 2 antennas, the antenna being a ⁇ 45°cross-polarized antenna.
  • the prior art generally adopts an MMSE receiver, while the present invention may select an advanced-MMSE receiver for suppressing MUI through a new DCI format.
  • a user i.e., UE
  • the simulation statistical results in the following table also show that the new DCI format according to the present invention not only effectively reduces downlink control overheads, but also effectively suppresses MUI, thereby achieving a larger system average rate and edge user rate than the prior art.
  • the methods 100, 200 or apparatuses 500, 600 according to the present invention may be implemented at a corresponding BS or UE, thereby forming a new DCI and performing MUI suppression with the DCI.
  • signal bearing medium may be a transmission medium or a recordable medium for computer-readable information, including a magnetic medium, an optical medium, or other suitable medium.
  • recordable mediums include: a magnetic disk or floppy disk in a hard disk driver, an optical disk for a CD driver, a magnetic tape, and other medium that can be contemplated by the skilled in the art.
  • any communication terminal with an appropriate programming apparatus can implement steps of the method of the present invention as embodied in the program product.

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Abstract

The present invention provides a method and apparatus for transmitting and receiving downlink control information based on multi-user MIMO transmission, wherein the method comprises: transmitting, to respective user equipments within one or more groups participating in multi-user MIMO transmission, radio network temporary group identifiers for identifying the groups and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups, and transmitting downlink control information to the respective user equipments within the one or more groups, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups, and the common scheduling indication information and specific scheduling indication information is obtained by the user equipment from the downlink control information through the radio network temporary group identifiers and the intra-group user equipment-specific identifiers. The method and corresponding apparatus according to the present invention may reduce downlink control overheads, thereby improving the overall performance of the communication system.

Description

Method and Apparatus for Transmitting and Receiving Downlink Control Information
Based on Multi-User MIMO Transmission
FIELD OF THE INVENTION
Embodiments of the present invention generally relate to the field of wireless communication technology. More specifically, embodiments of the present invention relate to a method and apparatus for transmitting and receiving downlink control information based on multi-use MIMO transmission. Background of the Invention
In a wireless communication system, a physical downlink control channel (PDCCH) allocates various resources to uplink/downlink transmission of the whole communication system and thus plays a crucial role in system scheduling. In particular, for example, for a multi-user-multi-m-multi-out (MU-MIMO) and coordinated multi-point transmit/receive (CoMP) system, the PDCCH capacity limitation has a significant influence on the overall MU-MIMO and CoMP performance. For example, in MU-MIMO transmission, many user equipments (UEs) have to be scheduled in the same subframe to expect MU-MIMO gains; however, the current PDCCH merely includes a limited number of control channel elements (CCEs), and almost half of these CCEs are reserved for uplink (UL) grants. The PDCCH capacity shortage becomes more severe in CoMP transmission scenario 4 than in other scenarios, because more UEs will be scheduled and they consume more PDCCH bandwidth.
In order to enhance the downlink (DL) MIMO performance of an LTE-Advanced (LTE-A) system, it should be considered to reduce PDCCH control overheads and improve PDCCH design so as to avoid capacity limitation of DL control regions associated with deploying MU-MIMO/CoMP. At present, downlink control overhead reduction is primarily achieved by reducing the size of the downlink control information (DCI) formats for physical downlink shared channel (PDSCH) and physical uplink shared channel (PUSCH) scheduling. For LTE Rel-8/0/10 UEs with MU-MIMO/CoMP operation, each paired UE (i.e., a member in a group participating in MU-MIMO transmission) has its own DCI for scheduling indication. Thus, multiple PDCCHs having a corresponding DCI format will be used for all paired UEs that occupy a same resource block. For an existing DCI format, many domains or fields (for example, allocation of resource blocks (RBs) and carrier indication) in each DCI are the same. Besides, each PDCCH channel is attached with a 16-bit cyclic redundancy check (CRC). All of these settings will consume too many overheads and severely degrade the delivery efficiency of DCI messages.
In MU-MIMO transmission, multi-user interference (MUI) would arise if no sufficient spatial orthogonality exists among scheduled multiple users. Due to lack of knowledge of interference caused by other UEs scheduled simultaneously, the UEs affected by the MUI would experience loss of transmission performance. If the grouped or paired users can know the MUI information of other UEs in the group or pair (such as the pre-coding or channel state information), the UE can select an appropriate receiver algorithm to perform MUI suppression.
Thus, the prior art needs a method and apparatus for transmitting DCI based on MU-MIMO transmission. Through this method and apparatus, DL control overheads can be reduced, thereby enhancing the overall performance of the communication system; further, MUI suppression can be realized, thereby improving UE transmission rate and system throughput.
SUMMARY OF THE INVENTION
In order to solve the above technical problem, one aspect of the present invention provides a method for transmitting downlink control information based on multi-user MIMO transmission, comprising:
transmitting, to respective user equipments within one or more groups participating in multi-user MIMO transmission, radio network temporary group identifiers for identifying the groups and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups ; and
transmitting downlink control information to the respective user equipments within the one or more groups, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups, and the common scheduling indication information and specific scheduling indication information is obtained by the user equipment from the downlink control information through the radio network temporary group identifiers and the intra-group user equipment-specific identifiers.
According to one embodiment of the present invention, the method further comprises, based on the channel state information received from the multiple user equipments, partitioning the user equipments into one or more groups participating in the multi-user MIMO transmission.
According to one embodiment of the present invention, wherein the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation for the respective user equipments within the groups.
According to one embodiment of the present invention, wherein the specific scheduling indication information at least comprises a transmit power control command, a new data indication, a hybrid automatic repeat request process number, and data demodulation reference signal configuration information, all of which are specific to respective user equipments within the groups, the method further comprising: performing an operation of producing data demodulation reference signals for the respective user equipments based on the radio network temporary group identifiers and the data demodulation reference signal configuration information of the respective user equipments within the groups.
According to one embodiment of the present invention, the method further comprises: performing a scrambling operation to cyclic redundancy check information in the downlink control information using the radio network temporary group identifiers; and transmitting the downlink control information attached with the scrambled cyclic redundancy check information to the respective user equipments within the one or more groups.
Another aspect of the present invention provides a method of receiving downlink control information based on multi-user MIMO transmission, comprising:
receiving radio network temporary group identifiers for identifying one or more groups participating in the multi-user MIMO transmission and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups as transmitted by a base station;
receiving downlink control information transmitted by the base station, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups; and
obtaining the common scheduling indication information and the specific scheduling indication information from the downlink control information through the radio network temporary group identifier and the intra-group user equipment specific identifiers.
According to one embodiment of the present invention, wherein the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation for the respective user equipments within the groups.
According to one embodiment of the present invention, wherein the specific scheduling indication information at least comprises a transmit power control command, a new data indication, a hybrid automatic repeat request process number, and data demodulation reference signal configuration information, all of which are specific to respective user equipments within the groups, the method further comprising: performing a demodulation operation to a data demodulation reference signal based on the radio network temporary group identifiers and the data demodulation reference signal configuration information of the respective user equipments within the group; estimating multi-user interference from other user equipments within the group during the multi-user MIMO transmission based on the data demodulation reference signal; and selecting a receiver algorithm suppressing the multi-user interference based on the estimated multi-user interference.
According to one embodiment of the present invention, there further comprises: receiving the downlink control information attached with cyclic redundancy check information that is scrambled using the radio network temporary group identifiers; performing a descrambling operation to the scrambled cyclic redundancy check information using the radio network temporary group identifiers; and performing a check operation to the downlink control information based on the descrambled cyclic redundancy check information.
One aspect of the present invention further provides an apparatus for transmitting downlink control information based on multi-user MIMO transmission, comprising:
a module configured to transmit, to respective user equipments within one or more groups participating in multi-user MIMO transmission, radio network temporary group identifiers for identifying the groups and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups ; and
a module configured to transmit downlink control information to the respective user equipments within the one or more groups, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups, and the common scheduling indication information and specific scheduling indication information is obtained by the user equipment from the downlink control information through the radio network temporary group identifiers and the intra-group user equipment-specific identifiers.
A still further aspect of the present invention further provides an apparatus for receiving downlink control information based on multi-user MIMO transmission, comprising:
a module configured to receive radio network temporary group identifiers for identifying one or more groups participating in the multi-user MIMO transmission and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups as transmitted by a base station; a module configured to receive downlink control information transmitted from the base station, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups; and
a module configured to obtain the common scheduling indication information and the specific scheduling indication information from the downlink control information through the radio network temporary group identifier and the intra-group user equipment specific identifiers.
Various aspects of the present invention further provide a base station and user equipment comprising the above apparatuses, respectively.
By using the method and apparatus for transmitting downlink control information based on
MU-MIMO transmission according to the present invention, the novel compact DCI format design reduces the DL control signaling overheads during MU-MIMO transmission; further, the present DCI format design is compatible with the existing DCI format. Further, because each UE in the group can estimate MUl based on the MUl information of other UEs as provided by the DCI of the present invention, the MUl can be effectively suppressed using an appropriate receiver algorithm.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
The above and other objectives, features, and advantages will become more apparent through the following detailed description on the exemplary embodiments with reference to the accompanying drawings.
Fig. 1 schematically illustrates a flow chart of a method of transmitting DCI based on MU-MIMO transmission according to one embodiment of the present invention;
Fig. 2 schematically illustrates a flow chart of a method of receiving DCI based on MU-MIMO transmission according to another embodiment of the present invention;
Fig. 3 schematically illustrates a structural diagram of DCI according to one embodiment of the present invention;
Fig. 4 schematically illustrates a detailed flow chart of a method of transmitting and receiving DCI based on MU-MIMO transmission according to one embodiment of the present invention;
Fig. 5 schematically illustrates a block diagram of an apparatus for transmitting DCI based on MU-MIMO transmission according to one embodiment of the present invention;
Fig. 6 schematically illustrates a block diagram of an apparatus for receiving DCI based on MU-MIMO transmission according to another embodiment of the present invention;
Fig. 7 shows performance estimation on user rates as achieved by the methods and apparatuses according to the present invention compared with the prior art in an exemplary simulation scenario.
DETAILED DESCRIPTION OF THE INVENTION
The basic idea of the present invention is to improve the structure of the existing DCI so as to effectively reduce DL control signaling overheads in the MU-MIMO/CoMP transmission and meanwhile utilize the information comprised in the improved DCI to realize effective suppression to the MUI. According to the embodiments of the present invention, at the base station (BS) side, the BS allocates to respective UEs in the same group a radio network temporary group identifier (g-RNTI) identifying the group and intra-group UE-specific identifiers (for example, in the form of serial numbers) for identifying respective UEs. Next, the BS transmits a new formatted DCI to respective UEs, the DCI comprising the same common scheduling indication information among respective UEs and specific scheduling indication information specific to respective UEs within the group. At the UE side, the scheduling indication information is obtained from the DCI using the previously received identification for transmission scheduling and MUI suppression.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
Fig. 1 illustrates a flow chart of a method 100 of transmitting DCI based on MU-MIMO transmission according to one embodiment of the present invention. As shown in Fig. 1 , the method 100 starts with step SI 01. In step S 102, the method 100 transmits, to respective user equipments within one or more groups participating in multi-user MIMO transmission, g-RNTIs for identifying the groups and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups. The transmission may be implemented through higher- layer signaling (for example, radio resource control (RRC) signaling) or layer- 1 signaling.
In one embodiment, the BS may partition multiple UEs into one or more groups participating into MU-MIMO transmission based on channel state information (CSI) received from multiple UEs. Multiple UEs within the same group will perform MU-MIMO transmission on the same time-frequency resource, while different multiple groups will perform MU-MIMO transmission on different time-frequency resources.
In one embodiment, the intra-group UE-specific identifiers may be serial numbers associated with g-RNTI. For example, when the group has four UEs, serial numbers 0, 1, 2, and 3 may be respectively allocated to the four UEs for identifying the four UEs.
Next, in step S I 03, the method 100 transmits DCI to respective UEs within one or more groups, the DCI comprising common scheduling indication information for the groups and specific scheduling indication information for respective UEs within the groups, and the common scheduling indication information and the specific scheduling indication information is obtained by the UE from the DCI through the above-mentioned g-RNTI and intra-group UE-specific identifiers.
In one embodiment, the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation for the respective UEs within the groups. The aforementioned specific scheduling indication information at least comprises a transmit power control command (TPC), a new data indication (NDI), a hybrid automatic repeat request (HARQ) process number, and data demodulation reference signal (DMRS) configuration information, all of which are specific to respective user equipments within the groups,
When the specific scheduling indication information comprises configuration information of DMRS, the method 100 may further comprise performing an operation of producing DMRS for respective UEs based on g-RNTI and DMRS configuration information of respective UEs within the groups.
In one embodiment, the method 100 may further comprise performing a scrambling operation to the CRC information of DCI using g-RNTI, and transmitting the DCI attached with scrambled CRC information to respective UEs within one or more groups.
Finally, the method 100 ends in step SI 04.
By utilizing the method 100 according to the above embodiments of the present invention, through a novel compact DCI format, it would be unnecessary to transmit common scheduling indication information with the same content repetitively for multiple times and attach CRC information for multiple times, thereby effectively reducing downlink control signaling overheads.
Fig. 2 schematically illustrates a flow chart of a method 200 of receiving DCI based on MU-MIMO transmission according to another embodiment of the present invention. As shown in Fig. 2, the method 200 starts with step S201. In step S202, the method 200 receives g-RNTI for identifying one or more groups participating in MU-MIMO transmission and intra-group UE-specific identifiers for identifying respective UEs within the groups as transmitted by a BS. As above mentioned, the receiving may be implemented through, for example, RRC higher-layer signaling or Layer- 1 signaling.
Next, in step S203, the method 200 receives the DCI transmitted from the BS, wherein the DCI comprises common scheduling indication information for the groups and specific scheduling indication information for respective UEs within the groups. In one embodiment, the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation information for respective UEs within the group, while the specific scheduling indication information at least comprises a TPC command, a NDI, a HARQ process number and DMRS configuration information, all of which are specific to respective UEs within the group.
After completion of step S203, the method 200 proceeds to step S204. Here, the method
200 obtains the common scheduling indication information and specific scheduling indication information from the DCI through the g-RNTI and the intra-group UE-specific identifiers. Finally, the method 200 ends in step S205.
Although it is not shown in Fig. 2, in one embodiment, when the specific scheduling indication information comprises data demodulation reference signal configuration information, the method 200 may further comprise performing an operation of demodulating DMRS based on the g-RNTI and the DMRS configuration information of respective UEs within the group.
Next, the method 200 estimates MUI from other UEs within the group during the MU-MIMO transmission based on the DMRS and selects a receiver algorithm suppressing the MUI based on the estimated MUI.
In another embodiment, the method 200 may further comprise receiving the DCI attached with g-RNTI-scrambled CRC information; performing a descrambling operation to the scrambled CRC information utilizing g-RNTI; and performing a check operation to the DCI based on the descrambled CRC information.
Through the method 200 according to the above embodiments of the present invention, a
DCI with a new format is received at the UE, which can reduce downlink control signaling overheads caused by repetitively receiving the common indication information with the same content and CRC information that is attached for multiple times. Further, by estimating the interference information from other UEs during MU-MIMO transmission, an appropriate receiver algorithm can be selected, thereby performing effective suppression to MUI. Because those skilled in the art may perform MUI suppression based on the obtained DMRS information through various appropriate methods or approaches (for example, advanced-minimum mean square error estimation algorithm), these methods or approaches will not be detailed here so as to avoid unnecessarily confusing the present invention.
Fig. 3 schematically illustrates a structural diagram of DCI according to one embodiment of the present invention. As illustrated in Fig. 3, the DCI according to the embodiments of the present invention comprises two portions, i.e., the common signaling field or domain for the group (i.e., common scheduling indication information) and UE-specific signaling fields or domains for user 1 and user 2 within the group (i.e., specific scheduling indication information for respective UEs within the group). It may be seen from Fig. 3 that the common signaling field at least comprises a carrier indication and a resource block allocation; the UE-specific signaling fields for user 1 and user 2 at least comprise: a TPC command, a HARQ process number, DMRS configuration information (an antenna port, a scrambling identifier, and a number of layers indication) and link adaptive information for transmission block 1 and transmission block 2, respectively, comprising a modulation coding scheme (MCS), a NDI, and a HArQ redundancy version (RV). Here, for the sake of simplicity, merely two UE-specific signaling fields are illustrated. However, those skilled in the art know based on the teaching of the present application that more UE-specific signaling fields can be attached as required.
Fig. 4 schematically illustrates a detailed flow chart of a method 400 of transmitting and receiving DCI based on MU-MIMO transmission according to one embodiment of the present invention. As shown in Fig. 4, the method 400 starts at step S401 , wherein multiple UEs transmit their own CSIs to the BS. Here, for the sake of simplicity, only one UE is illustrated. In step S402, the BS partitions multiple UEs into one or more groups based on the received CSI. Next, in step S403, the BS transmits identification information to UEs in respective groups through RRC signaling or Layer 1 signaling, and the identification information comprises the g-RNTIs for identifying the groups and the intra-group UE-specific identifiers for identifying respective UEs within the group, as discussed before.
Next, at step S404, the BS forms a new DCI according to the present invention based on the results of scheduling and resource allocation decisions, the DCI having the aforementioned structure, i.e., comprising the common scheduling indication information for the groups and the specific scheduling indication information for respective UEs within the groups. In step S405, the BS scrambles the CRC information for the DCI using the g-RNTI and attaching the scrambled CRC information to the DCI. The process proceeds to step S406. Here, the BS produces DMRS based on g-RNTI and DMRS configuration information. Next, in step S407, the BS transmits the DCI of a new format to respective UEs within respective groups and DMRS (for example, through the existing PDCCH domain or enhanced PDCCH (ePDCCH) domain). Execution of the above steps of method 400 performs the processing at the BS side. Next, the method 400 enters the processing flow at the UE side.
In step S408, the UE decodes the DCI through searching a UE-specific search space utilizing the previously received g-RNTI, wherein the step comprises performing a descrambling operation to the CRC utilizing the g-RNTI and performing a check operation to the received DCI utilizing the CRC information. Next, in step S409, the UE reads the common scheduling indication information and specific scheduling indication information utilizing the received g-RNTI and its own specific identifier, so as to perform subsequent DMRS demodulations and PDSCH demodulations.
Next, in step S410, based on the obtained DMRS configuration information of the UE and other UEs in the group, demodulation operations are performed to the DMRS of the UE and of the other UEs in the group. In step S411, through demodulating the DMRS of other UEs in the group, the MUI information (for example, precoding or CSI information) caused by other UEs may be known such that the UE may select an appropriate receiver algorithm based on the obtained interference information so as to suppress the MUI. For example, the UE may select an advanced-minimum mean square error (MMSE) receiver algorithm to perform PDSCH decoding to thereby suppress MUI. In this case, the UE's throughput performance can be further improved.
Through the method 400 according to the above embodiment of the present invention, a DCI with a new format reduces downlink control signaling overheads caused by repetitively transmitting the common indication information with the same content and CRC information that is attached for multiple times. Meanwhile, by estimating the interference information from other UEs during MU-MIMO transmission, the UE may pre-select an appropriate receiver algorithm, thereby performing effective suppression to MUI. Besides, the above flow sequence is merely exemplary, and without departing from the teaching of the present invention, those skilled in the art may vary it as required.
Fig. 5 schematically illustrates a block diagram of an apparatus 500 for transmitting DCI based on MU-MIMO transmission according to one embodiment of the present invention. The apparatus 500 comprises a first transmitting module 501 and a second transmitting module 502. In the apparatus 500, the first transmitting module 501 is configured to transmit, to respective UEs within one or more groups participating in MU-MIMO transmission, g-RNTIs for identifying the groups and intra-group UE-specific identifiers for identifying the respective UEs within the groups (i.e., performing step S 102 in the method 100); and the second transmitting module 502 is configured to transmit DCI to respective UEs within the one or more groups, wherein the DCI comprises common scheduling indication information for the groups and specific scheduling indication information for respective UEs within the groups, and the common scheduling indication information and the specific scheduling indication information is obtained by the UE from the DCI through the g-R TIs and intra-group UE-specific identifiers (i.e., performing step SI 03 in the method 100). It may be seen that the method 100 shown in Fig. 1 may be performed by implementing the apparatus 500.
Fig. 6 schematically illustrates a block diagram of an apparatus 600 for transmitting DCI based on MU-MIMO transmission according to another embodiment of the present invention. The apparatus 600 comprises a first receiving module 601, a second receiving module 602, and an obtaining module 603. In the apparatus 600, the first receiving module 601 is configured to receive g-RNTI for identifying one or more groups participating in MU-MIMO transmission and intra-group UE-specific identifiers for identifying respective UEs within the groups as transmitted by a BS (i.e., performing step S202 in the method 200); the second receiving module 602 is configured to receive the DCI transmitted by the BS, wherein the DCI comprises common scheduling indication information for the groups and specific scheduling indication information for respective UEs within the groups (i.e., performing step S203 in the method 200); and the obtaining module 603 is configured to obtain the common scheduling indication information and specific scheduling indication information from the DCI through the g-RNTI and the intra-group UE-specific identifiers (i.e., performing step S204 in the method 200). It may be seen that the apparatus 200 shown in Fig. 2 may be performed by implementing the apparatus 600.
Fig. 7 shows performance estimation on user rates as achieved by the methods and apparatuses according to the present invention compared with the prior art in an exemplary simulation scenario. Without loss of generality, suppose each cell has 25 UEs in the exemplary simulation scenario, each BS having 4 antennas, each UE having 2 antennas, the antenna being a ± 45°cross-polarized antenna. For the sake of simplicity, only per-UE single-stream transmission scenario is evaluated. As far as a receiver is concerned, the prior art generally adopts an MMSE receiver, while the present invention may select an advanced-MMSE receiver for suppressing MUI through a new DCI format. Under the above supposition, it is seen from the "Multi-User MIMO Transmission Rate" simulation results of Fig. 7 that with the same accumulated probability distributed value, a user (i.e., UE) adopting the method or apparatus of the present invention has a rate obviously higher than the prior art. Likewise, the simulation statistical results in the following table also show that the new DCI format according to the present invention not only effectively reduces downlink control overheads, but also effectively suppresses MUI, thereby achieving a larger system average rate and edge user rate than the prior art.
Figure imgf000013_0001
Although not shown in the drawings, those skilled in the art would appreciate, based on the disclosure or teaching of the present description, that the methods 100, 200 or apparatuses 500, 600 according to the present invention may be implemented at a corresponding BS or UE, thereby forming a new DCI and performing MUI suppression with the DCI.
To sum up, each preferred embodiment of the present invention has been described in detail with reference to the accompanying drawings. Those skilled in the art would appreciate that embodiments of the present invention may be implemented through hardware, software, firmware, module or a combination thereof, or the present invention may be embodied on a computer program product set on a signal bearer medium available to any suitable data processing system. Such signal bearing medium may be a transmission medium or a recordable medium for computer-readable information, including a magnetic medium, an optical medium, or other suitable medium. Examples of recordable mediums include: a magnetic disk or floppy disk in a hard disk driver, an optical disk for a CD driver, a magnetic tape, and other medium that can be contemplated by the skilled in the art. The skilled in the art should understand that any communication terminal with an appropriate programming apparatus can implement steps of the method of the present invention as embodied in the program product.
It should be noted that in order to make the present invention more comprehensible, the above description omits some more specific technical details which are known to the skilled in the art and may be essential to implement the present invention.
Although preferred embodiments of the present invention have been disclosed, those skilled in the art would appreciate that the preferred embodiments may be varied without departing from the spirit and scope of the present invention. Thus, the present invention is not limited to the preferred embodiments, and the appended claims comprise any and all such applications, modification, and embodiments within the scope of the present invention.

Claims

What Is Claimed Is:
1. A method of transmitting downlink control information based on multi-user MIMO transmission, comprising:
transmitting, to respective user equipments within one or more groups participating in multi-user MIMO transmission, radio network temporary group identifiers for identifying the groups and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups; and
transmitting downlink control information to the respective user equipments within the one or more groups, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups, and the common scheduling indication information and specific scheduling indication information is obtained by the user equipment from the downlink control information through the radio network temporary group identifiers and the intra-group user equipment-specific identifiers.
2. The method according to claim 1, further comprising:
partitioning the user equipments into one or more groups participating in the multi-user MIMO transmission based on channel state information received from the multiple user equipments.
3. The method according to claim 1, wherein the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation for the respective user equipments within the groups.
4. The method according to claim 1, wherein the specific scheduling indication information at least comprises a transmit power control command, a new data indication, a hybrid automatic repeat request process number, and data demodulation reference signal configuration information, all of which are specific to respective user equipments within the groups, the method further comprising:
performing an operation of producing data demodulation reference signals for the respective user equipments based on the radio network temporary group identifiers and the data demodulation reference signal configuration information of the respective user equipments within the groups.
5. The method according to claim 1, further comprising:
performing a scrambling operation to cyclic redundancy check information in the downlink control information using the radio network temporary group identifiers; and
transmitting the downlink control information attached with the scrambled cyclic redundancy check information to the respective user equipments within the one or more groups.
6. A method of receiving downlink control information based on multi-user MIMO transmission, comprising:
receiving radio network temporary group identifiers for identifying one or more groups participating in the multi-user MIMO transmission and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups as transmitted by a base station;
receiving downlink control information transmitted by the base station, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups; and
obtaining the common scheduling indication information and the specific scheduling indication information from the downlink control information through the radio network temporary group identifier and the intra-group user equipment-specific identifiers.
7. The method according to claim 6, wherein the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation for the respective user equipments within the groups.
8. The method according to claim 6, wherein the specific scheduling indication information at least comprises a transmit power control command, a new data indication, a hybrid automatic repeat request process number, and data demodulation reference signal configuration information, all of which are specific to respective user equipments within the groups, the method further comprising:
performing a demodulation operation to a data demodulation reference signal based on the radio network temporary group identifiers and the data demodulation reference signal configuration information of the respective user equipments within the group;
estimating multi-user interference from other user equipments within the group during the multi-user MIMO transmission based on the data demodulation reference signal; and
selecting a receiver algorithm suppressing the multi-user interference based on the estimated multi-user interference.
9. The method according to claim 6, further comprising:
receiving the downlink control information attached with cyclic redundancy check information that is scrambled using the radio network temporary group identifiers;
performing a descrambling operation to the scrambled cyclic redundancy check information using the radio network temporary group identifiers; and
performing a check operation to the downlink control information based on the descrambled cyclic redundancy check information.
10. An apparatus for transmitting downlink control information based on multi-user MIMO transmission, comprising:
a module configured to transmit, to respective user equipments within one or more groups participating in multi-user MIMO transmission, radio network temporary group identifiers for identifying the groups and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups; and
a module configured to transmit downlink control information to the respective user equipments within the one or more groups, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups, and the common scheduling indication information and specific scheduling indication information is obtained by the user equipment from the downlink control information through the radio network temporary group identifiers and the intra-group user equipment-specific identifiers.
11. The apparatus according to claim 10, further comprising:
a module configured to partition the user equipments into one or more groups participating in the multi-user MIMO transmission based on channel state information received from the multiple user equipments.
12. The apparatus according to claim 10, wherein the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation for the respective user equipments within the groups.
13. The apparatus according to claim 10, wherein the specific scheduling indication information at least comprises a transmit power control command, a new data indication, a hybrid automatic repeat request process number, and data demodulation reference signal configuration information, all of which are specific to respective user equipments within the groups, the apparatus further comprising:
a module configured to perform an operation of producing data demodulation reference signals for the respective user equipments based on the radio network temporary group identifiers and the data demodulation reference signal configuration information of the respective user equipments within the groups.
14. The apparatus according to claim 10, further comprising:
a module configured to perform a scrambling operation to cyclic redundancy check information in the downlink control information using the radio network temporary group identifiers; and
a module configured to transmit the downlink control information attached with the scrambled cyclic redundancy check information to the respective user equipments within the one or more groups.
15. An apparatus for receiving downlink control information based on multi-user MIMO transmission, comprising:
a module configured to receive radio network temporary group identifiers for identifying one or more groups participating in the multi-user MIMO transmission and intra-group user equipment-specific identifiers for identifying the respective user equipments within the groups as transmitted by a base station;
a module configured to receive downlink control information transmitted from the base station, wherein the downlink control information comprises common scheduling indication information for the groups and specific scheduling indication information for respective user equipments within the groups; and
a module configured to obtain the common scheduling indication information and the specific scheduling indication information from the downlink control information through the radio network temporary group identifier and the intra-group user equipment specific identifiers.
16. The apparatus according to claim 15, wherein the common scheduling indication information at least comprises the same information regarding a carrier indication and a resource block allocation for the respective user equipments within the groups.
17. The apparatus according to claim 15 , wherein the specific scheduling indication information at least comprises a transmit power control command, a new data indication, a hybrid automatic repeat request process number, and data demodulation reference signal configuration information, all of which are specific to respective user equipments within the groups, the apparatus further comprising:
a module configured to perform a demodulation operation to a data demodulation reference signal based on the radio network temporary group identifiers and the data demodulation reference signal configuration information of the respective user equipments within the group; a module configured to estimate multi-user interference from other user equipments within the group during the multi-user MIMO transmission based on the data demodulation reference signal; and
a module configured to select a receiver algorithm suppressing the multi-user interference based on the estimated multi-user interference.
18. The apparatus according to claim 15, further comprising:
a module configured to receive the downlink control information attached with cyclic redundancy check information that is scrambled using the radio network temporary group identifiers;
a module configured to perform a descrambling operation to the scrambled cyclic redundancy check information using the radio network temporary group identifiers; and
a module configured to perform a check operation to the downlink control information based on the descrambled cyclic redundancy check information.
19. A base station, comprising an apparatus according to any one of claims 10-14.
20. A user equipment, comprising an apparatus according to any one of claims 15-18.
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