CN102158302A - Method and device for indicating information - Google Patents

Method and device for indicating information Download PDF

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Publication number
CN102158302A
CN102158302A CN2010101121378A CN201010112137A CN102158302A CN 102158302 A CN102158302 A CN 102158302A CN 2010101121378 A CN2010101121378 A CN 2010101121378A CN 201010112137 A CN201010112137 A CN 201010112137A CN 102158302 A CN102158302 A CN 102158302A
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China
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dmrs port
information
described
rank
ue
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CN2010101121378A
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Chinese (zh)
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CN102158302B (en
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苏昕
缪德山
拉盖施
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电信科学技术研究院
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks

Abstract

The embodiment of the invention provides a method for indicating information, and the method comprises the following steps: a base station communicates with user equipment (UE) and allocates a corresponding dataflow to the UE according to the attribute of the UE; the base station sends downlink control information (DCI) to the UE, wherein the DCI contains information indications allocated to a downlink transmission Rank and a demodulation reference sign (DMRS) port; and the base station sends the corresponding dataflow to the UE through the DMRS port. By using the technical scheme provided by the invention, the signaling overhead is reduced by using a transmission block switch and through the combined coding of NDI (non-damage inspection) bits in the mono-code transmission, thereby supporting the combined indication of the DMRS port and bus Rank with a lower overhead.

Description

A kind of method and apparatus of information indication

Technical field

The present invention relates to digital communicating field, particularly, the present invention relates to a kind of method and apparatus of information indication.

Background technology

Move the developing direction that becomes modern communication technology with the broadband, 3GPP (3rd GenerationPartnership Project, third generation partner program) is devoted to LTE (Long TermEvolution, Long Term Evolution) system is as the evolution of 3G system, and target is that development 3GPP wireless access technology is towards high data rate, the low delay and the evolution of optimization packet data application direction.

At descending MIMO (Multi-input Multi-output, single user's multiple-input, multiple-output) in the transmission course, eNB will be according to each UE (User Equipment, factors such as channel condition subscriber equipment), business characteristic and priority are distributed the parallel data stream of some for each UE that is scheduled, and each data flow wherein is called one deck.In order to support maximum 8 layers space multiplexing technique, will define the DMRS (Demodulation Reference Symbol, demodulation reference mark) of 8 ports among the LTE-A (LongTerm Evolution Advanced, Long Term Evolution is senior).DMRS has adopted the precoding processing identical with data, and UE is by just knowing precoding equivalent channel matrix afterwards, the line data demodulation of going forward side by side to the measurement of DMRS.The descending SU-MIMO of LTE-A can support 8 layers at most, but considers the maximum MU-MIMO that only support total Rank=4 of possibility from signaling consumption and performance gain angle.Will continue the mixing SU/MU transmission mode among the Rel-9 among the LTE Rel-10, promptly support SU (Single User simultaneously by a kind of unified transmission mode, single user) with MU-MIMO (Multiuser Multi-input Multi-output, multi-user's multiple-input, multiple-output), realize the dynamic switching of SU and MU-MIMO.

In order to realize higher peak rate, the descending SU-MIMO of LTE-A can support the parallel transmission of 8 data Layers at most.In order to support the flexible spatial preconditioning technique, the LTE-A down link will adopt the transmission means based on demodulation reference mark DMRS.To define 8 DMRS antenna ports in the LTE Rel-10 standard, in downlink transmission process, eNB need pass through the distribution condition of DCI (DownlinkControl Information, Downlink Control Information) indication DMRS port.In addition, because the DMRS of LTE-A has adopted CDM-FDM (Code DivisionMultiplexing-Frequency Division Multiplexing, the code division multiplexing frequency division multiplexing) mode, in order to make the UE in the MU-MIMO transmission obtain correct power reference and correct demodulation downlink data, need make UE know its PDSCH (Physical DownlinkShared Channel by descending control signaling or other mechanism, the ratio of the power of the signal power of each data Layer Physical Downlink Shared Channel) and corresponding D MRS port, i.e. power excursion (power offset).In order in MU-MIMO, to support MMSE (Minimum Mean Squared Error, least mean-square error) receiving algorithm such as, to suppress co-channel interference better, not only need to indicate the DMRS antenna port distribution condition of each UE self that is scheduled, also need notifying with it in Downlink Control Information, the port of the UE of common scheduling takies situation.

Provided the DMRS pattern when having determined Rank1-4 at present among the LTE-A among Fig. 1.The DMRS pattern of Rank5-8 but can determine substantially in the DMRS pattern of Rank5-8 that each DMRS antenna port will be undertaken multiplexing by the mode of CDM-FDM at present just under discussion.Provided the DMRS pattern example of Rank5-8 among Fig. 2.

ENB need indicate the DMRS port assignment situation of the UE that is scheduled by Downlink Control Information in the downlink transmission process, consider from the angle of signaling consumption, do not need to support port indicating mode fully flexibly, general several port combination when only needing to consider every kind of total Rank get final product.Provided in the table 1 a kind of when utilizing the transmission of 3 bit control informations and single codeword vacant NDI bit indicate the scheme of DMRS distribution condition jointly, be designated as scheme 1.

The indication of table 1.DMRS port 3 bits

Only defined the demodulation pilot frequency of single port among the LTE Rel-8, promptly port 5.Then DMRS is expanded to dual-port among the Rel-9, port 7 and port 8 are multiplexing by the CDM mode.In Rel-8 and Rel-9, UE can suppose that the data RE power of each layer among the PDSCH is identical with corresponding DMRS port power separating timing, does not therefore need extra indication power excursion between the two.But in LTE Rel-10, because a plurality of DMRS ports can adopt the mode of CDM-FDM, therefore the unequal situation of power between DMRS port and the pairing data Layer may appear.In order to make UE obtain correct power reference when the downlink data receiving, it is explicit or implicitly indicate the signal power of each data Layer and the ratio of corresponding DMRS port power to control signaling by certain.

By Fig. 1 and Fig. 2 as can be known, according to total downlink transfer number of plies, each PRB centering DMRS may take 12 or 24 RE, is designated as pattern1 or pattern2 respectively.When carrying out data demodulates, UE not only needs to know the DMRS port assignment of himself, also need to know total DMRSpattern, whether the RE that could determine to be used for DMRS like this is shared by UE of other common scheduling, and determines whether need avoid above-mentioned RE is detected.Therefore need employed DMRS pattern is indicated in the descending control signaling.Provide the scheme of a kind of joint instructions DMRS pattern and port assignment in the table 2, be designated as scheme 2.

Table 2.DMRS pattern and port assignment are united the indication of 4 bits

Total Rank=1, Pattern 1 { 0} or { 1} 2 kinds of states Total Rank 2, Pattern 1 {0,1} 1 kind of state Total Rank 1, Pattern 2 { 0} or { 1} or { 2} or { 3} 4 kinds of states Total Rank 2, Pattern 2 0,1} or 2,3} 2 kinds of states Total Rank 3, Pattern 2 {0,1,2} 1 kind of state Total Rank 4, Pattern 2 {0,1,2,3} 1 kind of state

Total Rank 5-8, Pattern 2 Mapping one to one 4 kinds of states

There is following shortcoming as can be seen from above-mentioned prior art:

(1) scheme 1 is introduced the indication that 3 overhead bits are used for the DMRS port assignment situation of UE self, and vacant NDI bit reduced expense when this scheme had been utilized the single codeword transmission.The port assignment situation when but this scheme can't indicate single codeword to retransmit, for example in the first transmission of the Rank5 of SU-MIMO, code word 1 is mapped in 2 layers and code word 2 is mapped to and transmits in 3 layers, if three layers of code word 2 correspondences are made a mistake, need retransmit separately, then can be corresponding with it in the table 1 without any a kind of situation.Similar problem also can occur in the retransmission processes of single codeword layer 2 or layer 4.In addition, the situation listed according to table 1, UE can't obtain total Rank of complete DMRSpattern/ or power offset information by DCI, additionally notifies these information if desired, also needs very big expense;

(2) scheme 2 can utilize 4 bits to realize the joint instructions of DMRS port and DMRS pattern, but this method can not be indicated total Rank, therefore can not support MMSE, ZF and SIC class receiving algorithm, nor can obtain the PO indication by the listed indication information of table 3.

Therefore, be necessary to propose a kind of antenna port of can realizing and distribute the method with total Rank joint instructions,, support the joint instructions of DMRS port and total Rank with less expense by existing control information sending method.

Summary of the invention

Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, and the combined coding of NDI bit reduces signaling consumption to by the transmission of transmission block switch and single codeword the time especially, realizes supporting with less expense the joint instructions of DMRS port and total Rank.

In order to achieve the above object, embodiments of the invention have proposed a kind of method of information indication on the one hand, may further comprise the steps:

Base station and user equipment (UE) communicate, and are that described UE distributes corresponding data flow according to the attribute of described UE; Described base station sends Downlink Control Information DCI to described UE, and described DCI comprises the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment; Described base station sends to described UE by described DMRS port with corresponding data flow.

Embodiments of the invention have also proposed a kind of method of information indication on the other hand, may further comprise the steps:

User equipment (UE) and base station communicate, and described base station is that described UE distributes corresponding data flow according to the attribute of described UE; Described UE receives the Downlink Control Information DCI that described base station sends, and described DCI comprises the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment; Described UE receives the corresponding data flow that described base station sends by described DMRS port.

Embodiments of the invention have also proposed a kind of base station on the other hand, comprise transceiver module and coding module,

Described coding module is used for encoding send Downlink Control Information DCI to user equipment (UE), and described DCI comprises the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment; Described transceiver module is used for communicating with described UE, is that described UE distributes corresponding data flow according to the attribute of described UE, and by described DMRS port corresponding data flow is sent to described UE.

Embodiments of the invention have also proposed a kind of user equipment (UE) on the other hand, comprise transceiver module and decoding module,

Described decoding module is used for the Downlink Control Information DCI according to the base station transmission, and decoding obtains the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment; Described transceiver module is used for communicating with the base station, and described base station is that described UE distributes corresponding data flow according to the attribute of described UE, and receives the corresponding data flow that described base station sends by described DMRS port.

The such scheme that the present invention proposes, the combined coding of NDI bit reduces signaling consumption during by transmission block switch and single codeword transmission, realizes with the joint instructions of less expense support DMRS port with total Rank.The such scheme that the present invention proposes, very little to the change of existing system, can not influence the compatibility of system, and realize simple, efficient.

Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.

Description of drawings

Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:

DMRS pattern schematic diagram when Fig. 1 is Rank1-4;

DMRS pattern schematic diagram when Fig. 2 is Rank5-8;

Fig. 3 is the flow chart of the method for a kind of information indication of the embodiment of the invention;

Fig. 4 is the flow chart of the method for a kind of information indication of another embodiment of the present invention;

Fig. 5 is the structural representation of embodiment of the invention information indicating equipment.

Embodiment

Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.

In order to realize the present invention's purpose, the invention discloses the method for a kind of information indication, may further comprise the steps: base station and user equipment (UE) communicate, and are that described UE distributes corresponding data flow according to the attribute of described UE; Described base station sends Downlink Control Information DCI to described UE, and described DCI comprises the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment; Described base station sends to described UE by described DMRS port with corresponding data flow.

As shown in Figure 3, the flow chart for the method for a kind of information of embodiment of the invention indication may further comprise the steps:

S301: base station and user equipment (UE) communicate.

In step S301, base station and user equipment (UE) communicate, and are that UE distributes corresponding data flow according to the attribute of UE.

Particularly, in descending MIMO transmission course, eNB will distribute the parallel data stream of some for each UE that is scheduled according to the factors such as channel condition, business characteristic and priority of each UE, and each data flow wherein is called one deck.

S302: the base station sends Downlink Control Information DCI to UE, and wherein DCI comprises the information indication of downlink transfer Rank and DMRS port assignment.

In step S302, the base station sends Downlink Control Information DCI to described UE, and described DCI comprises the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment.

Particularly, the indication of the information of downlink transfer Rank and demodulation reference mark DMRS port assignment comprises following one or more information:

The combined information of Rank that downlink transfer is total and DMRS port assignment;

Described UE uses the information of DMRS port;

The relation information of the power offset of the combination of Rank that downlink transfer is total and DMRS port assignment and each code division multiplexing CDM group.

Below above-mentioned information is launched explanation.

In the technical scheme of the present invention, at first need to define the corresponding relation of total descending Rank and total DMRS port assignment situation, make between descending Rank number and the set of occupied DMRS port by this definition and set up one-to-one relationship.According to this corresponding relation, UE can determine that the DMRS that uses in the current downlink transfer gathers by the total Rank number in the DCI information is unique, has wherein comprised DMRS port and the employed DMRS port numbers of other all common scheduling UE that this UE oneself uses.Provided a kind of like this example of corresponding relation in the table 3.

The corresponding relation example that table 3. downlink transfer Rank and DMRS port take

Total Rank The DMRS port takies situation 1 {0} 2 {0,1} 3 {0,2,3} 4 {0,1,2,3} 5 {0,1,2,3,6} 6 {0,1,4,2,3,6} 7 {0,1,4,2,3,6} 8 {0,1,4,5,2,3,6,7}

Therefore present embodiment adopts the mode of total Rank number and DMRS port assignment joint instructions, needs the descending total Rank that definition supported and the combination of DMRS port assignment.According to above-mentioned definition, UE receives after the corresponding indication information, just can judge total Rank number of current downlink transfer, and himself employed DMRS port set.Table has provided the example that maximum MU Rank number is restricted to 4 o'clock combinations thereof relations among the 4-1, has provided maximum MU Rank number among the table 4-2 and be 2 o'clock combination examples.

The combination (maximum MU-MIMO Rank=4) of table 4-1. port indication and descending Rank

Total Rank Number of combinations Available port assignment mode 1 1 {0} 2 3 {0}{1}{0,1} 3 5 {0}{1}{2}{0,1}{0,2,3}

4 7 {0}{1}{2}{3}{0,1}{2,3}{0,1,2,3} 5 1 {0,1,2,3,6} 6 1 {0,1,2,3,4,6} 7 1 {0,1,2,3,4,6,7} 8 1 {0,1,2,3,4,5,6,7}

The combination (maximum MU-MIMO Rank=2) of table 4-2. port indication and descending Rank

Total Rank Number of combinations Available port assignment mode 1 1 {0} 2 3 {0}{1}{0,1} 3 1 {0,2,3} 4 1 {0,1,2,3} 5 1 {0,1,2,3,6} 6 1 {0,1,2,3,4,6} 7 1 {0,1,2,3,4,6,7} 8 1 {0,1,2,3,4,5,6,7}

In order to make UE obtain the correct power reference information of each layer data, defined the relation between the power offset in the combination of total Rank and DMRS port assignment and each CDM group in the present embodiment.UE just can directly judge the power excursion of each data Layer with respect to the DMRS port of correspondence according to above-mentioned information, and does not need extra control information to be specifically designed to the power excursion indication.The dimension of power excursion span and MU-MIMO has relation closely.Consider that from the performance gain angle MU-MIMO may support 4 parallel transmissions based on the data Layer of quadrature DMRS at most among the Rel-10, and each UE in the MU-MIMO transmission can support 5 layers at most.According to above-mentioned hypothesis, provided the example that maximum MU Rank number is 2 o'clock power excursion values among the table 5-1.Wherein the DMRS port set that comprises in each CDM group will define in standard, and it is 2 o'clock strength that table 5-2 has provided maximum MU Rank number.As can be seen from Table 5, if on the basis of scheme 1 supplemental capacity indication information again, may also need to introduce extra expense.

Power excursion (maximum MU-MIMO Rank=4) in each CDM group of table 5-1

Descending total Rank The number of plies in the DMRS CDM group 1 The number of plies in the DMRS CDM group 2 Power excursion in the DMRS CDM group 1 Power excursion in the DMRS CDM group 2 1 1 0 1 N/A 1 0 1 N/A 1 2 2 0 1 N/A 2 0 2 N/A 1 3 2 1 1.5 3 3 1 2 3 1.5 4 2 2 2 2

Power excursion (maximum MU-MIMO Rank=2) in each CDM group of table 5-2

Descending total Rank The number of plies in the DMRS CDM group 1 The number of plies in the DMRS CDM group 2 Power excursion in the DMRS CDM group 1 Power excursion in the DMRS CDM group 2 1 1 0 1 N/A 1 0 1 N/A 1 2 2 0 1 N/A 2 0 2 N/A 1

Defined after the combination of descending total Rank and DMRS port assignment, need represent above-mentioned combinations of states by specific control information.Introduce total Rank and DMRS port indication information territory in the present embodiment in descending DCI, suppose that the combination of total Rank and DMRS port assignment comprises M kind state altogether, and do not adopt any compression coding mode, then total Rank and DMRS port indication information are In order to reduce signaling consumption, can by with DCI in other information carry out combined coding.For example the Rank of certain UE was more than or equal to 2 o'clock, and two code words are generally adopted in the transmission of data.Need retransmit if certain transmission block makes a mistake, and another transmission block does not have transfer of data, then need to adopt the single codeword transmission.The switch of transmission block is by modulation coding mode (MCS) and redundancy versions (rv) information joint instructions among the DCI.During single codeword transmission simultaneously, the NDI bit corresponding with being closed code word is just vacant among the DCI comes out.In order to reduce the expense of control signaling, the NDI bit of vacant code word carries out combined coding with the new control information of introducing in the time of can utilizing the transmission of code word switch and single codeword, the NDI bit of vacant code word and new information field carry out combined coding during by code word switch, single codeword transmission, are used to indicate total Rank of downlink transfer and DMRS port assignment.Consider the scene that Rank retransmits greater than 1 single codeword, in the design of combined coding, must comprise indication information the transmission of single codeword multilayer.Provide an example (maximum MU-MIMO Rank=4) that carries out the combination of total Rank of combined coding indicating downlink and DMRS port assignment according to the foregoing description among the table 6-1, from this example, as can be seen, needed to introduce the overhead of 4 bits.With respect to scheme 2, the control expense is identical, but the amount of information that present embodiment provides horn of plenty (total Rank and power excursion) more.Example during maximum MU Rank=2 is provided by table 6-2.

Table 6-1. utilizes the NDI bit of TB switch/idle TB and the combined coding example (maximum MU-MIMO Rank=4) of total Rank and the indication of DMRS port

Table 6-2. utilizes the NDI bit of TB switch/idle TB and the combined coding example (maximum MU-MIMO Rank=2) of total Rank and the indication of DMRS port

S303: the base station sends data by the DMRS port to UE.

In step S303, the base station sends to described UE by the described DMRS port of determining with corresponding data flow in step S302.

As shown in Figure 4, the flow chart for the method for a kind of information of another embodiment of the present invention indication may further comprise the steps:

S401: user equipment (UE) and base station communicate.

In step S401, user equipment (UE) and base station communicate, and the base station is that UE distributes corresponding data flow according to the attribute of UE.

Particularly, in descending MIMO transmission course, eNB will distribute the parallel data stream of some for each UE that is scheduled according to the factors such as channel condition, business characteristic and priority of each UE, and each data flow wherein is called one deck.

S402:UE receives the base station and sends Downlink Control Information DCI, and wherein DCI comprises the information indication of downlink transfer Rank and DMRS port assignment.

In step S402, UE receives the Downlink Control Information DCI that the base station sends, and DCI comprises the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment.

Particularly, the indication of the information of downlink transfer Rank and demodulation reference mark DMRS port assignment comprises following one or more information:

The combined information of Rank that downlink transfer is total and DMRS port assignment;

Described UE uses the information of DMRS port;

The relation information of the power offset of the combination of Rank that downlink transfer is total and DMRS port assignment and each code division multiplexing CDM group.

Below above-mentioned information is launched explanation.

In the technical scheme of the present invention, at first need to define the corresponding relation of total descending Rank and total DMRS port assignment situation, make between descending Rank number and the set of occupied DMRS port by this definition and set up one-to-one relationship.According to this corresponding relation, UE can determine that the DMRS that uses in the current downlink transfer gathers by the total Rank number in the DCI information is unique, has wherein comprised DMRS port and the employed DMRS port numbers of other all common scheduling UE that this UE oneself uses.Provided a kind of like this example of corresponding relation in the table 3.

Therefore present embodiment adopts the mode of total Rank number and DMRS port assignment joint instructions, needs the descending total Rank that definition supported and the combination of DMRS port assignment.According to above-mentioned definition, UE receives after the corresponding indication information, just can judge total Rank number of current downlink transfer, and himself employed DMRS port set.Table has provided the example that maximum MU Rank number is restricted to 4 o'clock combinations thereof relations among the 4-1, has provided maximum MU Rank number among the table 4-2 and be 2 o'clock combination examples.

In order to make UE obtain the correct power reference information of each layer data, defined the relation between the power offset in the combination of total Rank and DMRS port assignment and each CDM group in the present embodiment.UE just can directly judge the power excursion of each data Layer with respect to the DMRS port of correspondence according to above-mentioned information, and does not need extra control information to be specifically designed to the power excursion indication.The dimension of power excursion span and MU-MIMO has relation closely.Consider that from the performance gain angle MU-MIMO may support 4 parallel transmissions based on the data Layer of quadrature DMRS at most among the Rel-10, and each UE in the MU-MIMO transmission can support 5 layers at most.According to above-mentioned hypothesis, provided the example that maximum MU Rank number is 2 o'clock power excursion values among the table 5-1.Wherein the DMRS port set that comprises in each CDM group will define in standard, and it is 2 o'clock strength that table 5-2 has provided maximum MU Rank number.As can be seen from Table 5, if on the basis of scheme 1 supplemental capacity indication information again, may also need to introduce extra expense.

Defined after the combination of descending total Rank and DMRS port assignment, need represent above-mentioned combinations of states by specific control information.Introduce total Rank and DMRS port indication information territory in the present embodiment in descending DCI, suppose that the combination of total Rank and DMRS port assignment comprises M kind state altogether, and do not adopt any compression coding mode, then total Rank and DMRS port indication information are In order to reduce signaling consumption, can by with DCI in other information carry out combined coding.For example the Rank of certain UE was more than or equal to 2 o'clock, and two code words are generally adopted in the transmission of data.Need retransmit if certain transmission block makes a mistake, and another transmission block does not have transfer of data, then need to adopt the single codeword transmission.The switch of transmission block is by modulation coding mode (MCS) and redundancy versions (rv) information joint instructions among the DCI.During single codeword transmission simultaneously, the NDI bit corresponding with being closed code word is just vacant among the DCI comes out.In order to reduce the expense of control signaling, the NDI bit of vacant code word carries out combined coding with the new control information of introducing in the time of can utilizing the transmission of code word switch and single codeword, the NDI bit of vacant code word and new information field carry out combined coding during by code word switch, single codeword transmission, are used to indicate total Rank of downlink transfer and DMRS port assignment.Consider the scene that Rank retransmits greater than 1 single codeword, in the design of combined coding, must comprise indication information the transmission of single codeword multilayer.Provide an example (maximum MU-MIMO Rank=4) that carries out the combination of total Rank of combined coding indicating downlink and DMRS port assignment according to the foregoing description among the table 6-1, from this example, as can be seen, needed to introduce the overhead of 4 bits.With respect to scheme 2, the control expense is identical, but the amount of information that present embodiment provides horn of plenty (total Rank and power excursion) more.Example during maximum MU Rank=2 is provided by table 6-2.

S403:UE receives the data that the base station sends by the DMRS port.

In step S403, UE receives the corresponding data flow that the base station sends by the described DMRS port of determining in step S402.

Corresponding and said method, as shown in Figure 5, the embodiment of the invention has also proposed a kind of base station 100 and subscriber equipment 200.

Wherein, base station 100 comprises transceiver module 110 and coding module 120.

Coding module 120 is used for encoding sending Downlink Control Information DCI to user equipment (UE) 200, and DCI comprises the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment;

Transceiver module 110 is used for communicating with UE200, is that UE200 distributes corresponding data flow according to the attribute of UE200, and by the DMRS port corresponding data flow is sent to UE200.

Particularly, the indication of the information of downlink transfer Rank and demodulation reference mark DMRS port assignment comprises following one or more information:

The combined information of Rank that downlink transfer is total and DMRS port assignment;

UE200 uses the information of DMRS port;

The relation information of the power offset of the combination of Rank that downlink transfer is total and DMRS port assignment and each code division multiplexing CDM group.

Particularly, in descending DCI signaling, introduce new information field, be used to indicate the combined information of total Rank of downlink transfer and DMRS port assignment.

Particularly, the NDI bit of vacant code word and new information field carry out combined coding during by code word switch, single codeword transmission, are used to indicate total Rank of downlink transfer and DMRS port assignment.

User equipment (UE) 200 comprises transceiver module 210 and decoding module 220.

Wherein, decoding module 220 is used for the Downlink Control Information DCI according to base station 100 transmissions, and decoding obtains the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment;

Transceiver module 210 is used for communicating with base station 100, and base station 100 is that UE distributes corresponding data flow according to the attribute of UE, and receives the corresponding data flow that base station 100 sends by the DMRS port.

Particularly, the indication of the information of downlink transfer Rank and demodulation reference mark DMRS port assignment comprises following one or more information:

The combined information of Rank that downlink transfer is total and DMRS port assignment;

UE uses the information of DMRS port;

The relation information of the power offset of the combination of Rank that downlink transfer is total and DMRS port assignment and each code division multiplexing CDM group.

Particularly, in descending DCI signaling, introduce new information field, be used to indicate the combined information of total Rank of downlink transfer and DMRS port assignment.

Particularly, the NDI bit of vacant code word and new information field carry out joint decoding during by code word switch, single codeword transmission, are used to indicate total Rank of downlink transfer and DMRS port assignment.

The such scheme that the present invention proposes, the combined coding of NDI bit reduces signaling consumption during by transmission block switch and single codeword transmission, realizes with the joint instructions of less expense support DMRS port with total Rank.The such scheme that the present invention proposes, very little to the change of existing system, can not influence the compatibility of system, and realize simple, efficient.

One of ordinary skill in the art will appreciate that and realize that all or part of step that the foregoing description method is carried is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises one of step or its combination of method embodiment when carrying out.

In addition, each functional unit in each embodiment of the present invention can be integrated in the processing module, also can be that the independent physics in each unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.

The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (16)

1. the method for an information indication is characterized in that, may further comprise the steps:
Base station and user equipment (UE) communicate, and are that described UE distributes corresponding data flow according to the attribute of described UE;
Described base station sends Downlink Control Information DCI to described UE, and described DCI comprises the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment;
Described base station sends to described UE by described DMRS port with corresponding data flow.
2. the method for information indication as claimed in claim 1 is characterized in that, the information indication of described downlink transfer Rank and demodulation reference mark DMRS port assignment comprises following one or more information:
The combined information of Rank that downlink transfer is total and DMRS port assignment;
Described UE uses the information of DMRS port;
The relation information of the power offset of the combination of Rank that downlink transfer is total and DMRS port assignment and each code division multiplexing CDM group.
3. the method for information indication as claimed in claim 2 is characterized in that, introduces new information field in descending DCI signaling, is used to indicate the combined information of total Rank of described downlink transfer and DMRS port assignment.
4. the method for information indication as claimed in claim 3 is characterized in that, the NDI bit and the described new information field of vacant code word carry out combined coding during by code word switch, single codeword transmission, are used to indicate total Rank of downlink transfer and DMRS port assignment.
5. the method for an information indication is characterized in that, may further comprise the steps:
User equipment (UE) and base station communicate, and described base station is that described UE distributes corresponding data flow according to the attribute of described UE;
Described UE receives the Downlink Control Information DCI that described base station sends, and described DCI comprises the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment;
Described UE receives the corresponding data flow that described base station sends by described DMRS port.
6. the method for information indication as claimed in claim 5 is characterized in that, the information indication of described downlink transfer Rank and demodulation reference mark DMRS port assignment comprises following one or more information:
The combined information of Rank that downlink transfer is total and DMRS port assignment;
Described UE uses the information of DMRS port;
The relation information of the power offset of the combination of Rank that downlink transfer is total and DMRS port assignment and each code division multiplexing CDM group.
7. the method for information indication as claimed in claim 6 is characterized in that, introduces new information field in descending DCI signaling, is used to indicate the combined information of total Rank of described downlink transfer and DMRS port assignment.
8. the method for information indication as claimed in claim 7 is characterized in that, the NDI bit and the described new information field of vacant code word carry out joint decoding during by code word switch, single codeword transmission, are used to indicate total Rank of downlink transfer and DMRS port assignment.
9. a base station is characterized in that, comprises transceiver module and coding module,
Described coding module is used for encoding send Downlink Control Information DCI to user equipment (UE), and described DCI comprises the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment;
Described transceiver module is used for communicating with described UE, is that described UE distributes corresponding data flow according to the attribute of described UE, and by described DMRS port corresponding data flow is sent to described UE.
10. base station as claimed in claim 9 is characterized in that, the information indication of described downlink transfer Rank and demodulation reference mark DMRS port assignment comprises following one or more information:
The combined information of Rank that downlink transfer is total and DMRS port assignment;
Described UE uses the information of DMRS port;
The relation information of the power offset of the combination of Rank that downlink transfer is total and DMRS port assignment and each code division multiplexing CDM group.
11. base station as claimed in claim 10 is characterized in that, introduces new information field in descending DCI signaling, is used to indicate the combined information of total Rank of described downlink transfer and DMRS port assignment.
12. base station as claimed in claim 11 is characterized in that, the NDI bit and the described new information field of vacant code word carry out combined coding during by code word switch, single codeword transmission, are used to indicate total Rank of downlink transfer and DMRS port assignment.
13. a user equipment (UE) is characterized in that, comprises transceiver module and decoding module,
Described decoding module is used for the Downlink Control Information DCI according to the base station transmission, and decoding obtains the information indication of downlink transfer Rank and demodulation reference mark DMRS port assignment;
Described transceiver module is used for communicating with the base station, and described base station is that described UE distributes corresponding data flow according to the attribute of described UE, and receives the corresponding data flow that described base station sends by described DMRS port.
14. user equipment (UE) as claimed in claim 13 is characterized in that, the information indication of described downlink transfer Rank and demodulation reference mark DMRS port assignment comprises following one or more information:
The combined information of Rank that downlink transfer is total and DMRS port assignment;
Described UE uses the information of DMRS port;
The relation information of the power offset of the combination of Rank that downlink transfer is total and DMRS port assignment and each code division multiplexing CDM group.
15. user equipment (UE) as claimed in claim 14 is characterized in that, introduces new information field in descending DCI signaling, is used to indicate the combined information of total Rank of described downlink transfer and DMRS port assignment.
16. user equipment (UE) as claimed in claim 15 is characterized in that, the NDI bit and the described new information field of vacant code word carry out joint decoding during by code word switch, single codeword transmission, are used to indicate total Rank of downlink transfer and DMRS port assignment.
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