WO2013107250A1

WO2013107250A1 - Downlink control information transmitting method and base station

Info

Publication number: WO2013107250A1
Application number: PCT/CN2012/087354
Authority: WO
Inventors: 石靖; 戴博; 夏树强; 方惠英; 李新彩
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-01-21
Filing date: 2012-12-25
Publication date: 2013-07-25
Also published as: CN103220795A

Abstract

A downlink control information transmitting method, a base station transmits public information or user dedicated information to a user equipment via a physical downlink shared channel (PDSCH), and gives instructions via the downlink control information (DCI) carried on a control channel, the bandwidth occupied by the PDSCH being less than the system bandwidth. Also provided is a base station.

Description

Downlink control information transmission method and base station

Technical field

The present invention relates to the field of wireless communications, and in particular, to a downlink control applicable in an LTE/LTE-A (Long Term Evolution/Long Term Evolution Advance) system and an evolved system thereof. Method of transmitting information and base station. Background technique

MTC (Machine Type Communication) user terminal (MTC UE), also known as M2M (Machine to Machine, Machine to Machine, Μ2Μ) user communication equipment, is the main application form of the Internet of Things at this stage. . Low power consumption and low cost are important guarantees for large-scale applications. At present, Μ2Μ technology has been supported by internationally renowned manufacturers such as NEC, HP, CA, Intel, IBM, AT&T, and mobile operators in various countries. The M2M devices currently deployed on the market are mainly based on the GSM (Global System of Mobile communication) system. In recent years, due to the high spectrum efficiency of LTE/LTE-A, more and more mobile operators have chosen LTE/LTE-A as the evolution direction of future broadband wireless communication systems. M2M multi-class data services based on LTE/LTE-A will also be more attractive. Only the cost of the LTE-M2M device can be lower than that of the MTC terminal of the GSM system, and the M2M service can be truly transferred from the GSM to the LTE system.

The cost of affecting MTC UEs is mainly in baseband processing and radio frequency. Reducing the number of RF antennas is a very effective way to reduce the cost of MTC UEs. That is, the receiving antenna of the MTC UE is smaller than the minimum configuration of the two receiving antennas of the conventional legacy LTE terminal (Ordinary Legacy R8/9/10 UE, OL UE for short). As shown in FIG. 1 , both the low-cost MTC UE and the legacy UE can transmit DCI (Downlink Control Information) through the PDCCH (Physical Downlink Control Channel), and the MTC UE and the new version of LTE-A ( The New Version Rl l/etc. UE, abbreviated as NV UE, can transmit DCI information through an enhanced Physical Downlink Control Channel (ePDCCH).

And the OL UE, the NV UE uses the DCI in the LTE/LTE-A system, and the MTC UE also obtains the DCI by demodulating the PDCCH/ePDCCH channel, so as to implement the PDSCH (Physical Downlink Share Channel, Physical Downlink Shared Channel) and PUSCH (Physical Uplink Share Channel) demodulation and control.

The existing LTE/LTE-A frame structure is shown in Figure 2 and Figure 3.

2 is a schematic diagram of a frame structure of a FDD (Frequency Division Duplexing) mode according to the related art. As shown in Figure 2, a 10ms radio frame consists of twenty slots (lengths) with lengths of 0.5ms and numbers 0~19. The slots 2i and 2i+1 form sub-frames of length 1ms. i.

3 is a schematic diagram of a frame structure of a TDD (Time Division Duplexing) mode according to the related art. As shown in FIG. 3, a 10 ms radio frame is composed of two half frames of 5 ms length. One field includes five subframes of length 1 ms, and subframe i is defined as two slots 2i and 2i+1 that are 0.5 ms long.

When the low-cost MTC terminal accesses the system, because the PDCCH is full-bandwidth interleaved, when the public information is received, all the control information of the PDCCH may not be received due to the large bandwidth, so that the PDSCH cannot be received and the public information cannot be obtained, resulting in the terminal. Unable to access the system.

The following three types of downlink physical control channels are defined in LTE/LTE-A: Physical Control Format Indicator Channel (PCFICH) and Physical Hybrid Automatic Retransmission Request Indicator Channel (Physical Hybrid Automatic Retransmission Request Indicator Channel) , referred to as PHICH) and the physical downlink control channel.

The information carried by the PCFICH is used to indicate Orthogonal Frequency Division Multiplexing (OFDM) symbol feedback information for transmitting the PDCCH in one subframe. The PDCCH is used to carry the DCI, and includes: uplink and downlink scheduling information, and uplink power control information. For the DCI format in the LTE/LTE-A system, DCI Format 0, 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, 3, 3A, 4 are included.

The information included in DCI Format 0 includes: carrier indication, format 0/1A identifier, PUSCH frequency hopping identifier, PUSCH resource allocation and frequency hopping allocation, MCS (Modulation Code Scheme) level and RV (Redundancy Version). Version), NDI (New Data Indicator), TPC (Transmit Power Control) command for scheduled PUSCH, DM RS (Demodulation Reference Signal) Cyclic shift and OCC (Orthogonal Cover Code) index, UL index, DAI (Downlink Assignment Index), CSI (Channel State Information) request, SRS ( Sounding Reference Signal, request reference, resource allocation type.

The information included in DCI Format 1 is: carrier indication, resource scheduling header, resource allocation, MCS level, HARQ (Hybrid Automatic Repeat Request) process number, NDI, RV, PUCCH for scheduling (Physical Uplink Share) Channel, physical uplink control channel) TPC command, DAI.

The information included in the DCI Format 1A when the C-RNT Cell Radio Network Temporary Identifier is used for scrambling is: carrier indication, format 0/1A identifier, and centralized/discrete VRB (Virtual Resource Block). The allocation flag, resource allocation, preamble index, and PRACH (Physical Random Access Channel) mask the index.

The information that DCI Format 1A includes when not using C-RNTI scrambling is: carrier indication, format 0/1A identification, centralized/discrete VRB allocation flag, resource allocation, MCS level, HARQ process number, NDI, RV, scheduling TPC command of PUCCH, DAI.

The DCI Format IB includes information: carrier indication, centralized/discrete VRB allocation flag, resource allocation, MCS level, HARQ process number, NDI, RV, TPC command for scheduled PUCCH, and DAL TPMI (Transmitted Precoding Matrix Indicator). The coding matrix indicates) precoding information, PMI (Precoding Matrix Indicator) confirmation information.

The information included in DCI Format 1C for one PDSCH scheduling is: gap indication value, resource allocation, and MCS.

The information included in the DCI Format 1C for notifying the MCCH (Multicast Control Channel) change is: MCCH change notification information.

The DCI Format 1D includes information: carrier indication, centralized/discrete VRB allocation flag, resource allocation, MCS level, HARQ process number, NDI, RV, TPC command for scheduled PUCCH, DAL TPMI precoding information, downlink power offset . The information included in DCI Format 2 includes: carrier indication, resource scheduling header, resource allocation, TPC command for scheduled PUCCH, DAI HARQ process number, transport block codeword switching flag, MCS level of transport block 1, and NDI of transport block 1. The RV of the transport block 1, the MCS level of the transport block 2, the NDI of the transport block 2, the RV of the transport block 2, and the precoding information.

The DCI Format 2A includes information: carrier indication, resource scheduling header, resource allocation, TPC command for scheduled PUCCH, DAI HARQ process number, transport block codeword switching flag, MCS level of transport block 1, and NDI of transport block 1. The RV of the transport block 1, the MCS level of the transport block 2, the NDI of the transport block 2, the RV of the transport block 2, and the precoding information.

The DCI Format 2B includes information: carrier indication, resource scheduling header, resource allocation, TPC command for scheduled PUCCH, DAI HARQ process number, scrambling acknowledgement, SRS request, MCS level of transport block 1, and NDI of transport block 1. , RV of transport block 1, MCS level of transport block 2, NDI of transport block 2, RV of transport block 2

The DCI Format 2C includes information: carrier indication, resource scheduling header, resource allocation, TPC command for scheduled PUCCH, DAI HARQ process number, antenna port and scrambling acknowledgement and layer number, SRS request, and MCS level of transport block 1. , NDI of transport block 1, RV of transport block 1, MCS level of transport block 2, NDI of transport block 2, RV of transport block 2

DCI Format 3 includes the following information: TPC command number 1 , TPC command number 2, ... TPC command number N ( N format 0

Format 0 = format 0 force CRC ( Cyclic

2

Redundancy Check, the number of bits before the cyclic redundancy check).

The DCI Format 3A includes the following information: TPC command number 1 and TPC command number 2 with TPC command number N (M =

Format 0 plus the number of bits before CRC).

The information included in DCI Format 4 is: carrier indication, resource allocation, TPC command for scheduled PUSCH, DM RS cyclic shift and OCC index, UL index, antenna port and scrambling acknowledgement and layer number, DAI CSI request, SRS request , resource allocation type, MCS level of transport block 1, NDI of transport block 1, MCS level of transport block 2, NDI of transport block 2

The low-cost receiving antenna-limited MTC UE may have a problem of reduced coverage performance in the LTE system, and the low-cost MTC UE may not be fully used because it does not support spatial multiplexing, MIMO, and the like. To the above many DCI formats and corresponding transmission modes. In addition, considering the enhancement of coverage performance, even if the existing partial DCI format can be applied to a low-cost MTC UE, there is a problem of excessive overhead.

Restricted for low-cost receiving antennas MTC UEs have limited coverage in LTE systems, and thus design a suitable information transmission process for low-cost MTC UEs. No effective solution has been proposed yet.

Summary of the invention

The technical problem to be solved by the present invention is to provide a downlink control information transmitting method and a base station, which can compensate for the coverage problem caused by the limited receiving antenna in the LTE system of the low-cost MTC terminal.

In order to solve the above problem, the present invention provides a method for transmitting downlink control information, including: a base station transmitting public information or user-specific information to a user equipment through a physical downlink shared channel (PDSCH), and downlink control information carried by the control channel (DCI) indicates, and the bandwidth occupied by the PDSCH is less than the system bandwidth.

The invention also provides a base station, including

The downlink control information sending unit is configured to: transmit the public information or the user-specific information to the user equipment by using a physical downlink shared channel (PDSCH), and the bandwidth occupied by the PDSCH is smaller than the system bandwidth;

The indication unit is configured to: indicate downlink information or user-specific information in the PDSCH by using downlink control information (DCI) carried by the control channel.

By using the method proposed by the embodiment of the present invention, not only the problem of receiving public information but also the coverage problem caused by the limitation of the receiving antenna in the LTE system can be compensated for. BRIEF abstract

1 is a diagram showing an example of a control channel supporting a low-cost MTC terminal device DCI according to an embodiment of the present invention;

2 is an FDD frame structure of an LTE/LTE-A system; 3 is a TDD frame structure of an LTE/LTE-A system;

FIG. 5 is a block diagram of a base station according to an embodiment of the present invention. Preferred embodiment of the invention

The invention is further elaborated below in conjunction with the drawings and specific embodiments. It should be noted that the embodiments in the present application and the various modes in the embodiments may be combined with each other without conflict.

The method for transmitting the downlink control information in the embodiment of the present invention is preferably applicable to a low-cost MTC UE, but does not exclude other types of UEs, and includes different sending methods, transmission modes, and corresponding control signalings of different types of information. .

The embodiment of the present invention provides a method for transmitting downlink control information, including: The base station uses the transmit diversity transmission mode to transmit public information directly to the user equipment through the PDSCH.

Wherein, the measurement reference signal CRS or the demodulation reference signal DMRS pilot is used in the transmit diversity transmission mode.

The base station sends the public information on subframe 0 and/or subframe 5.

The PDSCH bandwidth is smaller than the system bandwidth. Preferably, it is no more than the bandwidth for receiving access by the user equipment.

The frequency domain resource of the PDSCH is the full bandwidth of the access bandwidth of the user equipment, or is a predefined part of the bandwidth of the access bandwidth of the user equipment, where the user equipment includes a low-cost user equipment, or other user equipment. .

The base station performs power interference on the PDSCH by using a preset radio network temporary identifier RNTI.

The transport block size carried by the PDSCH is one of pre-defined k types, and k is a natural number.

The embodiment of the invention further provides a method for detecting downlink control information, including:

The user equipment blindly detects the physical downlink shared channel (PDSCH) carrying the public information, and obtains The public information.

The PDSCH that bears the public information by the user equipment includes:

The user equipment blindly detects the PDSCH in subframe 0 and/or subframe 5.

The blind detection is blind detection in units of one or more resource blocks RB.

The embodiment of the invention further provides a method for sending downlink control information, including:

The base station transmits the public information or the user-specific information to the user equipment through the PDSCH, and indicates the downlink control information (DCI) carried by the control channel, and the bandwidth occupied by the PDSCH is smaller than the system bandwidth.

The user equipment includes a low-cost user equipment.

Wherein, when transmitting the public information, a transmit diversity transmission mode is used.

Wherein, when transmitting the user-specific information, the transmit diversity transmission mode is fixedly used, or one of a single antenna port transmission and a transmit diversity transmission mode is selected.

Wherein, when transmitting the PDSCH by using a transmit diversity transmission mode, a cell-specific reference signal (CRS) or a DMRS pilot is used.

The frequency domain resource of the PDSCH and/or the PDCCH is the full bandwidth of the user equipment access bandwidth, or is a predefined part of the bandwidth of the user equipment access bandwidth.

The control channel is an enhanced physical downlink control channel or a newly defined physical downlink control channel.

The base station sends the public information or user-specific information on a predefined subframe. For example, a subset of the set of subframes {0, 9}.

The DCI is in one of the following formats:

Format 1A, Format 1C; The newly defined format; the format may be identified by the format 1E, and the identifier is only an example, and other identifiers different from the used DCI Format may be used as needed, which is not limited by the present invention.

The format of the new definition includes the following information:

DCI format identification, resource block allocation, modulation and coding scheme MCS, hybrid automatic repeat request HARQ process number, new data indication NDI, transmission of scheduled physical uplink control channel PUCCH Radio power control TPC command, downlink allocation index, transmission mode identifier;

Or, the DCI format identifier, the centralized/distributed virtual resource block VRB allocation flag bit, the resource block allocation, the MCS, the number of HARQ processes, the NDI, the TPC command to the scheduled PUCCH, the downlink allocation index, and the transmission mode identifier;

Or, DCI format identifier, resource block allocation, MCS, number of HARQ processes, NDI, TPC command for PUCCH for scheduling, and downlink allocation index;

Or, DCI format identifier, centralized/distributed VRB allocation flag bit, resource block allocation, MCS, HARQ process number, NDI, TPC command for scheduled PUCCH, downlink allocation index; or, DCI format identifier, resource block allocation, MCS, NDI, TPC command to scheduled PUCCH, downlink allocation index, and transmission mode identifier;

Or, DCI format identifier, centralized/distributed VRB allocation flag bit, resource block allocation, MCS, NPC pair scheduled PUCCH TPC command, downlink allocation index, and transmission mode identifier; or, DCI format identifier, resource block allocation, MCS And the NDL pairs the scheduled TPC command and the downlink allocation index of the PUCCH;

Or, DCI format identification, centralized/distributed VRB allocation flag bits, resource block allocation,

The TPC command and the downlink allocation index of the scheduled PUCCH by the MCS and the NDL;

The DCI format identifier is used to indicate a DCI format, and the transmission mode identifier is used to indicate a PDSCH transmission mode.

The transmission mode identifier occupies 1 bit.

Wherein, the DCI is Format 0, or is a newly defined format, and the format can use Format

The OA identifier is only an example, and other identifiers different from the used DCI Format may be used as needed, which is not limited by the present invention.

The format of this new definition includes the following information:

DCI format identifier, resource block allocation, MCS, NDL pair scheduled physical uplink shared channel PUPC TPC command, demodulation reference signal cyclic shift DMRS CS and orthogonal cover code OCC index, uplink index number, downlink allocation index;

Or, DCI format identification, resource block allocation, MCS, NDL, scheduling of PUSCH TPC command, DMRS CS and OCC index, uplink index number, downlink allocation index, channel status information CSI request.

Wherein, the resource block allocation occupies "i ₀ g _R ^L _3⁄4aPl /A"' ( ^L _3⁄4aPl /A "+ i) / ² ) 1 bit or ^g^w^^^ + / ² )] bit; The MCS occupies 4 bits or 3 bits or 2 bits or 1 bit.

The DCI format identifier occupies 1 bit.

The public information includes system messages, paging information, and random access feedback information.

Preferably, the UE blindly detects the control channel, and further obtains a PDSCH carrying public information or user-specific information according to the DCI carried by the control channel;

Preferably, the sending subframe of the public information is a predefined subframe, preferably subframe 0 and/or subframe 5, and may also be other subframes, as shown in FIG. 4, occupying subframes 1 and 6 , or, only occupy subframe 1, but not limited to these three.

Preferably, the DCI Format supported by the newly designed low cost MTC terminal (except DCI)

Format3/3A) Only UL Format MTC (also known as Format OA) / DL Format MTC (also known as Format IE)

Preferably, the uplink transmission mode only supports the transmission mode of single antenna port transmission.

Preferably, when the low-cost MTC uses the newly designed DCI format, the resource allocation mode only supports one continuous resource allocation mode type2, and does not support frequency hopping. The MCS level only supports the mode with the highest modulation order of QPSK or 16QAM. The HARQ process supports up to two processes, which can be indicated by lbit. Only periodic CSI feedback or aperiodic CSI feedback is supported.

Preferably, when using the single antenna port transmission mode, the N-SCID is a predefined value of 0 or 1. N-SCID is a parameter required for one of the pilot sequence initializations used in the single antenna port transmission mode. This can be seen in section 6.10.3.1 of 3GPP Protocol 36.211.

The reduction of the radio frequency link removes the receiving diversity of the UE, that is, the single antenna is reserved, which directly causes the UE to reduce the coverage performance. By designing a Compact DCI Format suitable for low-cost MTC UEs Improve coverage and reduce costs.

The related content will be further explained below.

1. For the blind detection PDSCH, similar to the PDCCH blind detection, the RNTL PDSCH whose CRC scrambling is detected occupies the full bandwidth or the predefined partial bandwidth of the system, the system bandwidth is divided into n copies, and the Low Cost UE is detected by the parts.

Solution 1: When the system bandwidth is 1.4MHz, there are 6 RBs, which are divided into 6 parts. When the PDSCH occupies the full bandwidth and allocates 1 RB as the resource unit, the Low Cost UE performs blind detection for each RB within 6 RB.

Scenario 2: When the system bandwidth is 5 MHz, there are 25 RBs, which are divided into 6 parts. When the PDSCH occupies the predefined bandwidth of the central 6 RB and is allocated in 2 RB resource units, the Low Cost UE is blinded every 2 RBs within the predefined bandwidth. Detection.

Scenario 3: When the system bandwidth is 1.4MHz, there are 6 RBs, which are divided into 3 parts. When the PDSCH occupies the full bandwidth and is allocated in 2 RB resource units, the Low Cost UE performs blind detection every 2 RBs within 6 RBs.

Scenario 4: When the system bandwidth is 1.4MHz, there are 6RB, divided into 3, when PDSCH occupies

The predefined bandwidth of 4 RBs is allocated in units of 2 RBs, and the Low Cost UE performs blind detection every 2 RBs within 4 RBs.

Scenario 5: When the system bandwidth is 1.4MHz, there are 6 RBs, which are divided into 1 parts, that is, the PDSCH is allocated in units of 6 RBs, and the Low Cost UE is blindly tested every 6 RBs.

2. For the transmission mode supported by the low-cost MTC terminal, it is the transmission mode of the transmission diversity, or the transmission mode of the transmission mode of the single antenna port and the transmission mode of the transmission diversity.

(a) In the downlink transmission mode, in the common search space and in the user equipment-specific search space defined by C-RNTI and SPS C-RNTI, the downlink control information format DCI Format IE is used to indicate the transmission mode, as shown in Table 1 or 2. Shown. When the transmission mode including the transmission mode of the single antenna port and the transmission mode of the transmission diversity is used, an increase of lbit is added to the DCI Format IE to distinguish.

Table 1 PDCCH and PDSCH configured by C-RNTI or SPS-R TI

Common and

Mode X DCI format IE C-RNTI or SPS-RNTI defines transmit diversity

UE specific (Proprietary) Table 2 PDCCH and PDSCH configured by C-RNTI or SPS-RNTI

(b) In the uplink transmission mode, in the common search space and in the user equipment-specific search space defined by the C-RNTI and the SPS C-RNTI, the downlink control information format DCI Format OA is used to indicate the transmission mode, as shown in Table 3. .

Table 3 PDCCH and PDSCH configured by C-RNTI or SPS-RNTI

3. For the subframe configuration setting of the transmission information, when the public information is transmitted, the transmission subframe of the public information preferably includes subframe 0 and or subframe 5 but is not limited thereto; when transmitting the proprietary information, transmitting the PDCCH The subframe is a predefined subframe, for example, a subset of the subframe {0, 9} set.

Scheme 1: The subframe for the control channel corresponding to the transmission of the proprietary information is all ten subframes within one frame, that is, {0, 9}, or any one or more subframes within one frame, suitable for each sub-frame. Dynamic scheduling of frames.

Scheme 2: The subframe for the control channel corresponding to the transmission of the proprietary information is five subframes within one frame, such as {0, 2, 4, 6, 8} or {1, 3, 5, 7, 9}, Suitable for cross-frame scheduling.

4. The MCS level corresponding to the transport block size of the PDSCH bearer is a predefined k type, and k is a natural number. As described in point 5, when the QPSK modulation mode is limited, the value set of k is {1. 2, 4, 8}; When the limit is 16QAM modulation mode, the value set of k is {1, 2, 4, 8, 16}; when the MCS level is not limited, the value of k is 32; when the transport block size For the predefined k types, the possible values are {1, 2, 4, 8}, and the modulation mode is fixed to one of QPSK or 16QAM.

5. In the Compact DCI Format design, there are several cases for the only supported resource allocation method:

(a) Only the DVRB mode in the resource allocation type type2 is supported. This consideration is mainly concerned with reducing the resource allocation bit field. "i.g ₂ (Ld _Pl Ns ^p J-(k _gaPl /Ns ^p J+i) 2) l bits are required. For example, when the low-cost MTC UE bandwidth is 1.4 MHz, the required resource allocation bit field only needs 3 bits. The advantage of this scheme is that using fewer bits helps to improve performance.

(b) Only the LVRB mode in the resource allocation type type2 is supported. This consideration is that the granularity when allocating resources can be in units of 1 RB. Requires 1. (^ (^ + 1)/2)] bits. For example, when the low-cost MTC UE has a bandwidth of 1.4 MHz, the required resource allocation bit field requires 5 bits. The advantage of this scheme is that the resource allocation is more refined. Enable more UEs to use resources at the same time.

(c) Support resource allocation type type2. The centralized/discrete VRB allocation flag 1 bit (set to '0 for LVRB) and resource block allocation "i.g ₂ (A3⁄4 + i)/2) bits are required, for example, when the low-cost MTC UE bandwidth is 1.4 MHz, The required resource allocation bit field requires 6 bits. The advantage of this scheme is that the resource allocation is more flexible.

For the MCS level bit field, there are several cases:

(a) Limit the maximum number of modulation solutions used to be 16QAM. The advantage of this scheme is to fully guarantee the average frequency efficiency of the system. Further can be subdivided into the following situations:

(al) The MCS level is expressed in 4 bits, for a total of 16 cases. For example, as shown in Table 4. Others in the existing MCS level 0-16 a total of 17 combinations of 16 combinations are included.

Table 4 MCS rating

1 2 1

2 2 2

3 2 3

4 2 4

5 2 5

6 2 6

7 2 7

8 2 8

9 2 9

10 4 9

11 4 10

12 4 11

13 4 12

14 4 13

15 4 14

16 4 15

( a2 ) The MCS level is expressed in 3 bits, for a total of 8 cases. For example: As shown in Table 5. Others in the existing MCS level 0-16 a total of 17 selected combinations of 8 are included.

Table 5 MCS rating

16 4 15

( a3 ) The MCS level is expressed in 2 bits, and there are 4 cases. For example: As shown in Table 6. Others in the existing MCS level 0-16 a total of 17 kinds of combinations are included in 4 combinations.

Table 6 MCS rating

( a4 ) The MCS level is represented by lbit, and there are two cases. For example: As shown in Table 7. Others in the existing MCS level 0-16 a total of 17 kinds of combinations are included.

Table 7 MCS rating

( a5 ) The MCS level bit field is not used, that is, only one MCS level is supported. For example: As shown in Table 8. Others in the existing MCS level 0-16 a total of 17 selected one of the combinations are included.

Table 8 MCS rating

14

(b) Limit the maximum number of modulation solutions used to be QPSK. The advantage of this scheme is to minimize the MCS bit field while reducing the processing complexity while ensuring that the spectrum efficiency is not lower than that of the GSM system. Further can be subdivided into the following situations:

( bl ) The MCS level is expressed in 3 bits, for a total of 8 cases. For example: As shown in Table 9. Others are included in the existing MCS level. 0-9 A total of 10 combinations are included.

Table 9 MCS rating

( b2 ) The MCS level is expressed in 2 bits, for a total of 4 cases. For example: As shown in Table 10, among the existing MCS grades, there are 10 combinations of 10 to choose 4 of them.

Table 10 MCS rating

(b3) The MCS level is represented by lbit, which is a total of two cases. For example: As shown in Table 11, the other in the existing MCS level 0-9 a total of 10 kinds of combinations are included.

Table 11 MCS rating

(b4) The MCS level bit field is not used, that is, only one MCS level is supported. For example: As shown in Table 12. Others in the existing MCS level 0-9 a total of 10 selected one of the combinations are included.

Table 12 MCS rating

For the bit field of the number of HARQ processes, there are the following cases:

(a) Use lbit to indicate the number of HARQ processes, that is, support 2 HARQ processes. This kind of consideration is mainly to ensure the demand of the HARQ process for the burst service, and only one HARQ process can be used for the periodic report service.

(b) The HARQ process number bit field is not used, that is, only one HARQ process is supported. This kind of consideration is mainly for the convenience of operation, and all users use one process.

The DCI format OA and DCI format IE corresponding to the transmission mode used by the low-cost MTC terminal are as follows.

plan 1 :

Information bit ^. Each field (if any, padded 0 bits are also included) is mapped in the order in which they appear, with the first field mapped to the lowest information bit _Ω . The next field is mapped to a high information bit. The most significant bit of each field maps to the lowest information bit of the corresponding field, for example, the most significant bit of the first field maps to _Ω . .

Among them, the DCI format 0Α, 1Ε, 3, and 3Α have the same load size.

Format OA

DCI format OA is used for PUSCH scheduling.

The following information is transmitted via the DCI format OA:

- A flag distinguished by the format OA and the format 1E - 1 bit, where: "0" indicates the format OA, "1" indicates the format 1E, and of course, "1" indicates the format OA, and "0" indicates the format IE; This is not limited.

- Resource block allocation l. g ₂

/A ”' ( ^L _3⁄4apl /A ”+ l)/ 2) Bit, see

Definition of 7.1.6.3 in 36.213. Where N _{gapl is} defined in 6.2.3.2 of 36.211, as defined in section 7.1.6.3 of 36.213

- Modulation coding scheme - 3 bits, see description of MCS level in the specific implementation

- New data indicates one by one 1 bit

- Transmission power control command for the scheduled PUSCH - 2 bits, see 36.213

Section 5.1.1.1 Definition

- DMRS CS and OCC index - 3 bits, see section 5.5.2.1.1 of [1]

― Upstream index number – 2 bits, see section 8 of 36.213 and sections 5.1.1.1, 7.1.2 and 8.4 (this field only appears in the uplink and downlink configuration of TD-LTE 0)

- Downlink allocation index - 2 bits, see section 7.3 of 36.213 (this field only appears in TD-LTE uplink and downlink configuration 1-6)

If the number of information bits of format 0A is less than the payload size of format 1E (including any padding bits added to format 1E), format 0A must be padded with 0 until the payload size is equal to the payload size of format 1E. Format IE

The DCI format IE is used for a PDSCH codeword and a compression schedule for a random access procedure initiated by a PDCCH order.

The following information is transmitted via DCI format 1E:

Only when the CRC of the DCI format 1E is scrambled using the C-RNTI, the format 1E is used for the random access procedure initiated by the PDCCH order, and the remaining fields are set as follows:

- Random access pilot sequence number - 6 bits

- PRACH mask number - 4 bits

- The remaining bits of the compression schedule for a PDSCH codeword in format 1E are all set to 0.

Otherwise,

- Resource block allocation log ₂ (L _R ^L _3⁄4apl /A "' ( ^L _3⁄4apl /A "+ l)/2) bits

- Modulation and coding scheme - 3 bits, see description of MCS level in the specific embodiment - HARQ process number - 1 bit

- New data indicates one by one 1 bit

- Transmission power control command of the scheduled PUCCH - 2 bits, see 36.213

Section 5.1.2.1 Definition

- Transmission mode identification - lbit, 0 means single antenna port transmission, 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). Of course, 1 may indicate a single antenna port transmission, and 0 indicates a transmission diversity transmission mode, which is not limited by the present invention.

Of course, the format and transmission mode identifiers distinguished by format 0A and format 1E can also use 2 bits. The manner of the joint coding is indicated, and the present invention does not limit this.

If the number of information bits in format 1E is less than the payload size of the format OA (including any padding bits added to the format OA), format 1E must be padded with 0 until the payload size is equal to the payload size of the format OA.

Scenario 2:

The fields defined below in the DCI format for low cost MTC UEs correspond to information bits α _ϋ to ^a Al.

Each field (if any, padded 0 bits are also included) is mapped in the order in which they appear, with the first field mapped to the lowest information bit _Ω . The next field is mapped to a high information bit. The most significant bit of each field maps to the lowest information bit of the corresponding field, for example, the most significant bit of the first field maps to _Ω . .

Among them, the DCI format 0Α, 1Ε, 3, and 3Α have the same load size.

Format OA

DCI format OA is used for PUSCH scheduling.

The following information is transmitted via the DCI format OA:

- Format OA and format 1E distinguishing flags - 1 bit, where: "0" means format OA, "1" means format 1E

- Resource block allocation log ₂ (L _R ^L _3⁄4apl /A "' ( ^L _3⁄4apl /A "+ l) / 2) bits

- New data indicates one by one 1 bit

- Transmission power control command for the scheduled PUSCH - 2 bits, see section 5.1.1.1 of 36.213

- DMRS CS and OCC index - 3 bits, see section 5.5.2.1.1 of [1]

- Downlink allocation index - 2 bits, see section 7.3 of 36.213 (this field only appears in TD-LTE uplink and downlink configuration 1-6) If the number of information bits of the format OA is less than the payload size of the format 1E (including any padding bits added to the format 1E), the format OA must be padded with 0 until the payload size is equal to the payload size of the format 1E.

Format IE

The following information is transmitted via DCI format 1E:

Format 1A is used only when the CRC of DCI format 1A is scrambled using C-RNTI

The random access process initiated by the PDCCH command, and the remaining fields are set as follows:

- Random access pilot sequence number - 6 bits

- PRACH mask number - 4 bits

Otherwise,

- Resource block allocation one by one ^ W^A^ + l) /^bit

― HARQ process number - 1 bit

- New data indicates one by one 1 bit

Section 5.1.2.1 Definition

- Transmission mode identification - lbit, 0 means single antenna port transmission, 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits in format 1E is less than the payload size of format 0A (including any Added to the padding bits of the format OA), Format 1E must be padded with 0 until the payload size is equal to the payload size of the format OA.

Option 3:

The fields defined below in the DCI format for low cost MTC UEs correspond to information bits α _ϋ to ^a Al .

Each field (if any, padded 0 bits are also included) is mapped in the order in which they appear, with the first field mapped to the lowest information bit ^Ω . The next field is mapped to a high information bit. The most significant bit of each field maps to the lowest information bit of the corresponding field, for example, the most significant bit of the first field maps to _Ω . .

Among them, the DCI format 0Α, 1Ε, 3, and 3Α have the same load size.

Format OA

DCI format OA is used for PUSCH scheduling.

The following information is transmitted via the DCI format OA:

- Resource block allocation one by one ^ W^A^ + l) / ^bit

- Modulation coding scheme - 3 bits, see description of MCS level in the specific implementation - New data indicates one by one 1 bit

- DMRS CS and OCC index - 3 bits, see section 5.5.2.1.1 of [1]

If the number of information bits in format 0A is less than the payload size of format 1E (including any padding bits added to format 1E), format 0A must be padded with 0 until the payload size is equal to the cell size The payload size of the IE.

Format IE

The following information is transmitted via DCI format 1E:

Only when the CRC of DCI format 1A is scrambled using C-RNTI, Format 1A is used for the random access procedure initiated by the PDCCH order, and the remaining fields are set as follows:

- Random access pilot sequence number - 6 bits

- PRACH mask number - 4 bits

Otherwise,

- Centralized/distributed VRB allocation flag bit - 1 bit, see section 6.1.6.3 in 36.213

- Resource block allocation one by one ^ W^A^ + l) /^bit

― HARQ process number - 1 bit

- New data indicates one by one 1 bit

Section 5.1.2.1 Definition

- Transmission mode identification - lbit, 0 means single antenna port transmission, 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits in format 1E is less than the payload size of format OA (including any Added to the padding bits of the format OA), Format 1E must be padded with 0 until the payload size is equal to the payload size of the format OA.

Option 4:

Information bit ^.

Ά-1

Among them, the DCI format 0Α, 1Ε, 3, and 3Α have the same load size.

Format OA

DCI format OA is used for PUSCH scheduling.

The following information is transmitted via the DCI format OA:

Resource block allocation ^v VRB.gapl ' ^JV RB (IN VRB, gapl / N^ \+ l) / 2) \bit, see

Definition of 7丄6.3 in 36.213. Among them, N _{gapl is} defined in 36.211, and N is defined in 36.213.

- Modulation coding scheme - 2 bits, see description of MCS level in the specific embodiment - New data indicates one by one 1 bit

- DMRS CS and OCC index - 3 bits, see section 5.5.2.1.1 of [1]

Format IE

The following information is transmitted via DCI format 1E:

- Random access pilot sequence number - 6 bits

- PRACH mask number - 4 bits

Otherwise,

- Modulation coding scheme - 2 bits, see description of MCS level in the specific embodiment - HARQ process number - 1 bit

- New data indicates one by one 1 bit

Section 5.1.2.1 Definition

Option 5:

Among them, the DCI format 0Α, 1Ε, 3, and 3Α have the same load size.

Format OA

DCI format OA is used for PUSCH scheduling.

The following information is transmitted via the DCI format OA:

- Resource block allocation l. g ₂ (b _gapl /NS ^P J- (kvm _gapl /NS ^P J+ 1) 2) 1 bit, see

- Modulation coding scheme - 1 bit, see description of MCS level in the specific implementation - New data indication - 1 bit

Section 5.1.1.1 Definition

- DMRS CS and OCC index - 3 bits, see section 5.5.2.1.1 of [1]

Format IE

The following information is transmitted via DCI format 1E:

- Random access pilot sequence number - 6 bits

- PRACH mask number - 4 bits

Otherwise,

- Modulation and coding scheme - 1 bit, see description of MCS level in the specific embodiment - HARQ process number - 1 bit

- New data indicates one by one 1 bit

Section 5.1.2.1 Definition

Option 6:

Among them, the DCI format 0Α, 1Ε, 3, and 3Α have the same load size.

Format OA

DCI format OA is used for PUSCH scheduling.

The following information is transmitted via the DCI format OA:

Section 5.1.1.1 Definition

- DMRS CS and OCC index - 3 bits, see section 5.5.2.1.1 of [1]

Format IE

The following information is transmitted via DCI format 1E:

- Random access pilot sequence number - 6 bits

- PRACH mask number - 4 bits

Otherwise,

Section 5.1.2.1 Definition

- Transmission mode identification - lbit, 0 means single antenna port transmission, 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits in format 1E is less than the payload size of format OA (including any padding bits added to format OA), format 1E must be padded with 0 until the payload size is equal to the cell size The payload size of the OA.

Option 7:

The fields defined in the DCI format for the low-cost MTC UE below correspond to the information bits α _ϋ

«Α-1

Among them, the DCI format 0Α, 1Ε, 3, and 3Α have the same load size.

Format OA

DCI format OA is used for PUSCH scheduling.

The following information is transmitted via the DCI format OA:

- Resource block allocation l. g ₂

/A ”' ( ^L _3⁄4apl /A ”+ l)/2) bit, see

Section 5.1.1.1 Definition

- DMRS CS and OCC index - 3 bits, see section 5.5.2.1.1 of [1]

- CSI request - 1 bit, see section 7.2.1 of 36.213

Format IE

The following information is transmitted via DCI format 1E:

- Random access pilot sequence number - 6 bits

- PRACH mask number - 4 bits

Otherwise,

- New data indicates one by one 1 bit

Section 5.1.2.1 Definition

- Transmission mode identification - lbit, 0 means single antenna port transmission, 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits in format 1E is less than the payload size of format OA (including any How to add padding bits to the format OA), the format IE must be padded with 0 until the payload size is equal to the payload size of the format OA.

In the foregoing solutions, the manner in which each field is mapped to information bits may also be changed, and the mapping order may also be changed. The foregoing is only an example, which is not limited by the present invention.

The invention is further illustrated by the following specific examples.

Example 1

When the eNB sends system information to the UE, the information is only carried by the PDSCH and does not pass the PDCCH indication.

The system information is carried in the PDSCH, and is transmitted in subframes 0 and 5, using QPSK modulation, and the used TBS is one of k types, occupying 2 RBs of bandwidth in full bandwidth, and adopting transmission mode of transmission diversity.

When the UE receives the public information, it performs blind detection in subframes 0 and 5. The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and performs blind detection in units of 2 RBs in the search space in the entire bandwidth, and sequentially detects the number of the six RBs as {1, 2}. RBs of {3, 4}, {5, 6} are detected in the third group, and then k kinds of TBSs are detected in the RB numbers {5, 6}.

Example 2

When the eNB sends the public information to the UE, the information is carried only by using the PDSCH and does not pass the PDCCH indication.

The public information is carried in the PDSCH, and is transmitted in subframes 0 and 5, using QPSK modulation, and the used TBS is one of k types, occupying 2 RBs of bandwidth in a predefined bandwidth of 4 RBs, and using transmit diversity. Transfer mode.

When the UE receives the public information, it performs blind detection in subframes 0 and 5. The UE detects whether it is the information sent to itself according to the RNTI scrambled by the CRC attached to the message, and then performs blind detection in units of 2 RB in the search space within the predefined bandwidth.

For Embodiment 1, the applicable modulation scheme may be other than BPSK, 16QAM, etc. in addition to QPSK; the occupied RBs may be 1, 2, 3, 4, 5, 6 RBs or more but less than 50 RBs; The combination of RBs can be multiple, and 6 RBs (or RB values corresponding to other bandwidths) are selected. A combination of 2 RBs (or other RB counts).

For Embodiment 2, in addition to the above, there are also predefined bandwidths of X RBs, x being 1, 2, ..., 6 RBs or more but less than the system bandwidth.

Example 3

When the eNB sends the public information to the UE, the PDSCH is used to carry the information and is indicated by the DCI carried by the PDCCH.

The public information is carried in the PDSCH, and is transmitted in subframes 0 and 5, using QPSK modulation, and the used TBS is one of k types, occupying 1 RB bandwidth in full bandwidth 6 RB, and transmitting transmission diversity. mode.

When receiving the public information, the UE performs blind detection of the PDCCH in subframes 0 and 5. The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and then performs blind detection detection of the DCI Format 1A according to the CCE aggregation level in the common search space in the full bandwidth, and obtains the DCI and then obtains the PDSCH. Public information.

The configuration of the transfer mode at this time is:

Example 4

When the eNB sends the public information to the UE, the PDSCH is used to carry the information and is indicated by the Compact DCI carried by the ePDCCH.

The public information is carried in the PDSCH, and is transmitted in subframes 0 and 5, using QPSK modulation, and the used TBS is one of k types, occupying 2 RBs of bandwidth in full bandwidth 6 RB, and transmitting transmission diversity. mode.

When receiving the public information, the UE performs blind detection of the ePDCCH in subframes 0 and 5. The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and then performs blind detection detection of the DCI Format IE according to the 2RB in the common search space in the full bandwidth, and obtains the DCI and then obtains the PDSCH. Public information.

The configuration of the transfer mode at this time is: UE downlink transmission mode PDCCH corresponding PDSCH

DCI format search space

Transmission scheme Mode X DCI format IE Common Transmit diversity The configuration of the DCI Format IE is:

Format IE

The following information is transmitted via DCI format 1E:

Resource block allocation i -DL

^l VRBgapl ' ^v RB L/ ^V VRB 1 1) / 2)] bit

- Modulation and coding scheme - 3 bits, see description of MCS level in the specific implementation - Number of HARQ processes - 1 bit

- New data indicates one by one 1 bit

- Transmission power control command for scheduled PUCCH - 2 bits, see section 5.1.2.1 of 36.213

If the number of information bits in format 1E is less than the payload size of format 0A (including any padding bits added to format 0A), format 1E must be padded with 0 until the payload size is equal to the payload size of format 0A.

This embodiment can be modified as follows: different DCI configurations are used; DCI format IE is configured with different number of bits; the number of RBs occupied by the PDSCH can be 1 2 3 4 5 6 RBs or more but less than the system bandwidth; The number of RBs can be 1, 2, 4 8RB

Example 5

When the eNB sends the proprietary information to the UE, the PDSCH is used to carry the information and is indicated by the DCI carried by the PDCCH. The proprietary information is carried in the PDSCH and is transmitted in the predefined subframes 0 to 9. The modulation mode is not limited. The TBS used is one of the k types, and the bandwidth of one RB is occupied in the full bandwidth 6 RB. Send the transmission mode of the diversity.

When receiving the private information, the UE performs blind detection in the predefined subframes 0 to 9. The RN UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC appended by the message, and then the proprietary search space in the full bandwidth. The DCI Format 1A is blindly detected according to the CCE aggregation level, and the DCI is obtained to obtain the proprietary information in the PDSCH.

The configuration of the transfer mode at this time is:

At this point, the configuration of the DCI Format IE is:

Format IE

The following information is transmitted via DCI format 1E:

- Format OA and format 1E distinguishing flags - 1 bit, where: "0" indicates the format

OA, "1" means format 1E

Resource block allocation

^l VRBgapl ' ^v RB L/ ^V VRB 1 1) / 2)] bit

― HARQ process number - 1 bit

- New data indicates one by one bit - Transmission power control command for the scheduled PUCCH - 2 bits, see section 5.1.2.1 of 36.213

- Downstream allocation index - 2 bits, see section 7.3 of 36.213 (this field only

Appears in TD-LTE uplink and downlink configuration 1-6)

Example 6

When the eNB sends the proprietary information to the UE, the PDSCH is used to carry the information and is indicated by the Compact DCI carried by the PDCCH.

The proprietary information is carried in the PDSCH, and is transmitted in the predefined subframes 0 to 9. The QPSK modulation is used, and the used TBS is one of the k types, occupying 1 RB bandwidth in the full bandwidth 6 RB. The transmission mode of the antenna port.

When receiving the proprietary information, the UE performs blind detection of the PDCCH in the predefined subframes 0 to 9. The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and then performs blind detection of the DCI Format IE in units of 1 RB in a dedicated search space in the full bandwidth, and obtains the DCI and then obtains the PDSCH. Proprietary information.

The configuration of the transfer mode at this time is:

Among them, when using CRS, there is only one port, which is a single antenna port.

At this point, the configuration of the DCI Format IE is:

Format IE

The DCI format IE is used for one PDSCH codeword and compression scheduling of a random access procedure initiated by one PDCCH order. The following information is transmitted via the DCI format IE:

OA, "1" means format 1E

- Resource block allocation one by one ^ W^A^ + l) /^bit

― HARQ process number - 1 bit

- New data indicates one by one 1 bit

Appears in TD-LTE uplink and downlink configuration 1-6)

- Transmission mode identification - lbit, 0 means single antenna port transmission, 1 means transmission diversity

Transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field).

If the number of information bits in format 1E is less than the payload size of format OA (including any padding bits added to format OA), format 1E must be padded with 0 until the payload size is equal to the payload size of format 0A.

Example 7

When the eNB sends the proprietary information to the UE, the PDSCH is used to carry the information and is indicated by the Compact DCI carried by the ePDCCH.

The proprietary information is carried in the PDSCH, and is transmitted in the predefined subframes {0, 2, 4, 6, 8}, using 16QAM modulation, and the used TBS is one of the k types, occupying 2 in the full bandwidth 6RB. The bandwidth of the RBs is the transmission mode of the transmit diversity.

When receiving the proprietary information, the UE performs blind detection of the ePDCCH in the predefined subframes {0, 2, 4, 6, 8}. The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and then performs blind detection of the DCI Format IE according to the 2RB in the dedicated search space in the full bandwidth, and obtains the DCI and then obtains the PDSCH. Proprietary information.

DCI format search space

Transmission scheme

Common and C-RNTI

With a single antenna port, port mode X DCI format IE or SPS-RNTI defined

7

UE specific

Common and C-RNTI

Mode X DCI format IE or SPS-RNTI defined transmit diversity

UE specific The configuration of the DCI Format IE at this time is:

Format IE

The following information is transmitted via DCI format 1E:

Resource block allocation

^l VRBgapl ' ^v RB L/ ^V VRB 1 1) / 2)] bit

- Modulation coding scheme - 4 bits, see description of MCS level in the specific embodiment - New data indicates one by one 1 bit

- Transmission mode identification - lbit, 0 means single antenna port transmission, 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits of format 1E is less than the payload size of format OA (including any padding bits added to format OA), format 1E must be padded with 0 until the payload size is equal to the payload size of format OA. Example 8

When the eNB sends the proprietary information to the UE, the PDSCH is used to carry the information and is indicated by the DCI carried by the PDCCH.

The proprietary information is carried in the PDSCH, and is transmitted in the predefined subframes 0 to 9. In the QPSK modulation mode, the TBS used is one of the k types, and the bandwidth of the two RBs is occupied in the full bandwidth 6 RB. The transmission mode of a single antenna port.

When receiving the proprietary information, the UE performs blind detection of the PDCCH in the predefined subframes 0 to 9. The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and then blindly detects the DCI Format OA according to the CCE aggregation level in the proprietary search space in the full bandwidth, and obtains the DCI and then obtains the PDSCH. Proprietary information.

The configuration of the transfer mode at this time is:

At this point, the DCI Format OA configuration is:

Format OA

DCI format OA is used for PUSCH scheduling.

The following information is transmitted via the DCI format OA:

OA, "1" means format 1E

Resource block allocation - "i-DL

Log ^l VRBgapl ' ^v RB v * VRBga l

l)/2) Bits, see 7丄6.3 in 36.213. Among them, N _{gapl is} defined in 36.211, and N is defined in 36.213.

Modulation coding scheme - 3 bits, see the description of the MCS level in the specific implementation. The new data indicates one-to-one bits. - Transmission power control command for the scheduled PUSCH - 2 bits, see section 5.1.1.1 of 36.213

- DMRS CS and OCC index - 3 bits, see section 5.5.2.1.1 of [1]

If the number of information bits in the format OA is less than the payload size of format 1E (including any padding bits added to format 1E), format OA must be padded with 0 until the payload size is equal to the payload size of format 1E.

This embodiment can be modified as follows: different DCI configurations are used; DCI format IE configuration of different number of bits; DCI format OA configuration of different number of bits; number of RBs occupied by PDSCH can be 1, 2, 3, 4, 5 6 RBs or more but less than the system bandwidth; the number of RBs occupied by the ePDCCH may be 1, 2, 4, 8 RB; different transmission mode settings; the predefined subframe may be any combination of 0 to 9;

In the embodiment of the present invention, the public information and the user-specific information may be transmitted in the same subframe and/or different subframes.

The embodiment of the present invention further provides a base station, as shown in FIG. 5, including:

a downlink control information sending unit, configured to transmit public information or user-specific information to the user equipment by using a physical downlink shared channel (PDSCH), and the bandwidth occupied by the PDSCH is smaller than a system bandwidth;

And an indication unit, configured to indicate public information or user-specific information in the PDSCH by using downlink control information (DCI) carried by the control channel.

Among them, the DCI format refers to the method embodiment.

When the downlink control information transmitting unit transmits the public information, the transmit diversity transmission mode is used.

The downlink control information sending unit uses the transmit diversity transmission mode fixedly when transmitting the user-specific information, or selects one of a single antenna port transmission and a transmit diversity transmission mode. Kind.

The downlink control information sending unit transmits the information by using a transmit diversity transmission mode.

In the PDSCH, the cell-specific reference signal CRS or the demodulation reference signal DMRS pilot is used.

The downlink control information sending unit sends the public information or user-specific information in a predefined subframe.

DCI format reference method embodiment.

In the embodiment of the present invention, the public information is directly transmitted in the PDSCH by removing the DCI, and the UE directly detects the PDSCH to obtain the public information, so as to prevent the UE from receiving the PDCCH control information due to the limited bandwidth, and the PDSCH cannot be detected and the public information cannot be obtained. The problem is that, in addition to DCI, the control information overhead is saved. In addition, the PDSCH is transmitted using a small bandwidth, which facilitates UE reception. In another embodiment of the present invention, the size of the DCI Format is reduced by the Compact DCI Format, thereby reducing control information and improving coverage performance.

The above is only the embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. All modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

Industrial applicability

By using the method proposed by the embodiment of the present invention, not only the problem of receiving public information but also the coverage problem caused by the limitation of the receiving antenna in the LTE system can be compensated for.

Claims

Claim

1. A method for transmitting downlink control information, including,

The base station transmits the public information or the user-specific information to the user equipment through the physical downlink shared channel PDSCH, and indicates the downlink control information DCI carried by the control channel, and the bandwidth occupied by the PDSCH is smaller than the system bandwidth.

2. The method of claim 1, wherein the transmit diversity transmission mode is used when transmitting the public information.

3. The method according to claim 1, wherein when the user-specific information is transmitted, the transmit diversity transmission mode is fixedly used, or one of a single antenna port transmission and a transmit diversity transmission mode is selected.

The method according to claim 1, 2 or 3, wherein the cell-specific reference signal CRS or the demodulation reference signal DMRS pilot is used when transmitting the PDSCH using the transmit diversity transmission mode.

The method of claim 1, wherein the frequency domain resource of the PDSCH and/or the physical downlink control channel PDCCH is the full bandwidth of the access bandwidth of the user equipment, or the bandwidth of the user equipment is accessed. The predefined portion of the bandwidth.

The method according to claim 1, wherein the control channel is an enhanced physical downlink control channel or a newly defined physical downlink control channel.

The method of claim 1, wherein the base station transmits the public information or user-specific information on a predefined subframe.

8. The method according to claim 1, wherein the DCI is in one of the following formats:

Format 1A, Format 1C; newly defined format;

The format of the new definition includes the following information:

DCI format identifier, resource block allocation, modulation and coding scheme MCS, hybrid automatic repeat request HARQ process number, new data indication NDI, transmit power control TPC command for scheduled physical uplink control channel PUCCH, downlink allocation index, transmission mode identifier ;

Alternatively, the DCI format identifier, the centralized/distributed virtual resource block VRB allocation flag bit, the resource block allocation, the MCS, the number of HARQ processes, the NDI, the TPC command to the scheduled PUCCH, Row allocation index, transmission mode identifier;

Or, DCI format identifier, centralized/distributed VRB allocation flag bit, resource block allocation, MCS, NPC pair scheduled PUCCH TPC command, downlink allocation index, and transmission mode identifier; or, DCI format identifier, resource block allocation, MCS , NDL to the scheduled PUCCH

TPC command, downlink allocation index;

Or DCI format identifier, centralized/distributed VRB allocation flag bit, resource block allocation, MCS, NPC pair scheduling PUCCH TPC command, downlink allocation index;

9. The method of claim 8 wherein

The transmission mode identifier occupies 1 bit.

10. The method of claim 1, wherein

The DCI is Format O, or, is a newly defined format,

The format of this new definition includes the following information:

Alternatively, the DCI format identifier, the resource block allocation, the MCS, the TPC command of the NDL to the scheduled PUSCH, the DMRS CS and OCC index, the uplink index number, the downlink assignment index, and the channel state information CSI request.

11. The method of claim 8, 9 or 10, wherein The resource block allocation occupied _{_{^{_{^{"l 0 g N v D R L}}}}} ¾apl / A MN v D R L ¾apl / A " ₊ l) / ²⁾ bits or

"1. (Λ3⁄4 (Λ3⁄4 ₊ 1) /2)] bits; where N _gapl is the difference of the physical resource block PRB index corresponding to the two slots corresponding to the virtual resource block, and N is the resource block RB included in the downlink bandwidth Number; The MCS occupies 4 bits or 3 bits or 2 bits or 1 bit.

12. The method of claim 8, 9 or 10, wherein

The DCI format identifier occupies 1 bit.

The method according to any one of claims 1 to 3, 5 to 10, wherein the transport block size carried by the PDSCH is one of pre-defined k types, and k is a natural number.

14. A base station, including,

The downlink control information sending unit is configured to: transmit the public information or the user-specific information to the user equipment by using the physical downlink shared channel PDSCH, and the bandwidth occupied by the PDSCH is smaller than the system bandwidth;

The indication unit is configured to: downlink control information carried by the control channel, DCI, indicating public information or user-specific information in the PDSCH.

The base station according to claim 14, wherein the downlink control information transmitting unit is configured to: when transmitting the public information, use a transmit diversity transmission mode.

The base station according to claim 14, wherein the downlink control information sending unit is configured to: when transmitting the user-specific information, use a transmit diversity transmission mode fixedly, or transmit and transmit diversity transmissions in a single antenna port Choose one of the modes.

The base station according to claim 14, 15 or 16, wherein the downlink control information transmitting unit is configured to: use a cell-specific reference signal CRS or a demodulation reference signal when transmitting the PDSCH by using a transmit diversity transmission mode DMRS pilot.

The base station according to claim 14, wherein the frequency domain resource of the PDSCH and/or the PDCCH is the full bandwidth of the user equipment access bandwidth, or is a predefined part of the user equipment access bandwidth. bandwidth.

The base station according to claim 14, wherein the control channel is an enhanced physical downlink control channel or a newly defined physical downlink control channel.

The base station according to claim 14, wherein the downlink control information sending unit is configured to: send the public information or user-specific information on a predefined subframe.

The base station according to claim 14, wherein the DCI is in one of the following formats: Format 1A, Format 1C; newly defined format;

The format of the new definition includes the following information:

TPC command, downlink allocation index;

22. The base station according to claim 21, wherein the transmission mode identifier occupies 1 bit.

23. The base station according to claim 14, wherein The DCI is FormatO, or, is a newly defined format,

The format of this new definition includes the following information:

DCI format identifier, resource block allocation, MCS, NDI, TPC command for scheduled physical uplink shared channel PUSCH, cyclic shift DMRS CS and orthogonal cover code OCC index of demodulation reference signal, uplink index number, downlink allocation index;

Alternatively, DCI format identification, resource block allocation, MCS, NDI, TPC command for scheduled PUSCH, DMRSCS and OCC index, uplink index number, downlink allocation index, channel status information CSI request.

24. The base station according to claim 21, 22 or 23, wherein

The resource block allocation occupies "i ₀ g ₂ (Ld _Pl Ns ^p J-(k _gaPl /N ^p "+i)/2) bits or

"1. (Λ3⁄4(Λ3⁄4 ₊ 1)/2)] bits; where N _gapl is the difference of the physical resource block PRB index corresponding to the two slots corresponding to the virtual resource block, and N is the number of RBs included in the downlink bandwidth; The MCS occupies 4 bits or 3 bits or 2 bits or 1 bit.

The base station according to claim 21, 22 or 23, wherein

The DCI format identifier occupies 1 bit.

The base station according to any one of claims 14 to 16, 18 to 23, wherein the transport block size of the PDSCH bearer is one of a predefined k type, and k is a natural number.