CROSS-REFERENCE TO RELATED APPLICATION

This application is the U.S. national phase of PCT Application No. PCT/CN2019/073671 filed on Jan. 29, 2019, which claims priority to Chinese Patent Application No. 201810147628.2 filed on Feb. 12, 2018, the disclosures of which are incorporated in their entirety by reference herein.

TECHNICAL FIELD

The present disclosure relates to the field of communications technology, and in particular to a downlink control information (DCI) transmission method, a device and a network equipment.

BACKGROUND

In the new radio (New Radio, NR) system, broadcast message can be divided into master information block (master information block, MIB), remaining minimum system information (remaining minimum system information, RMSI) and other system information (other system information, OSI) and paging (paging) information;

the MIB is transmitted in a physical broadcast channel (physical broadcast channel, PBCH);

the RMSI and the OSI are transmitted in a physical downlink shared channel (physical downlink shared channel, PDSCH) and are scheduled by corresponding physical downlink control channel (physical downlink control channel, PDCCH); paging information can be divided into two types: one is directly indicated in the physical downlink control channel (physical downlink control channel, PDCCH), the other is transmitted by a physical downlink shared channel (physical downlink shared channel, PDSCH) scheduled by the physical downlink control channel (physical downlink control channel, PDCCH).

The MIB, RMSI, OSI, and paging are all broadcast message, and the coverage of a cell is the intersection of the coverages of MIB, SI, paging, and SI/paging PDCCH.

In the NR system, the payload of the MIB is 56 bits, and the symbol number of NR PBCH is 576 resource elements (resource elements, REs), where DMRS accounts for ¼, so 576*(1−¼)=432 REs are used for transmitting data. The PBCH uses QPSK coding, and the PBCH contains only MIB information therein. Therefore, the number of the coded bits of the MIB can reach 432*2=864 bits, the code rate is 56/864=0.065, and the MIB can be transmitted 4 times, and merged at the UE.

In the NR system, DCI format 1_0 (downlink fallback DCI) can be used in the related art to schedule the RMSI/OSI/paging information.

The payload of DCI format 1_0 is about 64 bits, the aggregation level (aggregation level, AL) that PDCCH can adopt is 4, 8, 16; at different aggregation levels, minus ¼ of the number of DMRS symbols, the number of available REs is as follows:

ALRE numberCoded bits (bits)Code rate42164320.14884328640.0741686417280.052

A Control Channel Element (Control Channel Element, CCE) contains 6 RE groups (REGs), an REG contains 12REs;

when AL=4, the available REs are 4*6*12*(1−¼)=216 REs.

Frequency domain resources of control resource set (Control-resource Set, CORESET) of the RMSI are 24 RBs, 48 RBs, 96 RBs; where RB is a resource block;

The RMSI CORESET configures the bandwidth of the initial BWP, which is equal to the bandwidth of the RMSI CORESET.

Therefore, the initial bandwidth part (initial BWP) has 24 RBs, 48 RBs, 96RBs depending on the configuration. In a case of mini-slot scheduling, the number of symbols that can be occupied is 2/4/7 OFDM symbols, the SI/paging is transmitted by a single port, and the Demodulation Reference Signal (Demodulation Reference Signal, DMRS) configuration (configuration) type2 is adopted, then DMRS occupies ⅓ of the RE resources of the first OFDM symbol, and the available resources are as follows:

Max REs24 RBs48 RBs96 RBs2 OFDM symbols48096019204 OFDM symbols1056211242247 OFDM symbols192038407680

If 2 OFDM symbols and 24 RBs are used for transmission, the available REs can be calculated as: 2*12*24−1*12*24*⅓=432 REs.

When scheduling SI/paging using DCI format 1_0, if the aggregation level is 4 or 8, the code rate is too large (compared to MIB, the code rate for the MIB is 0.065), the PDCCH may not reach the coverage of the MIB.

In the LTE, the SI and paging are modulated by using QPSK fixedly.

In the NR system, DCI format 0_0/1_0 is used to schedule data in Ultra Reliable & Low Latency Communication (Ultra Reliable & Low Latency Communication, URLLC) scenarios, which has a higher code rate, resulting in a smaller PDCCH coverage.

SUMMARY

The embodiments of the present disclosure provide a downlink control information (DCI) transmission method, a device and a network equipment to solve the problem of high code rate of the PDCCH and insufficient coverage in the DCI transmission in the related art.

In a first aspect, an embodiment of the present disclosure provides a downlink control information (DCI) transmission method applied to a network equipment, which includes:

determining a DCI format for transmitting the downlink control information (DCI), the DCI format including: a time domain resource allocation field, an aggregation transmission indication field, a first indication field or a second indication field, the first indication field indicating a configuration value of a time domain resource and a configuration value of a modulation order, the second indication field indicating a configuration value of a time domain resource and a configuration value of an aggregate transmission indication; and

transmitting the DCI according to the DCI format.

In a second aspect, an embodiment of the present disclosure further provides a downlink control information (DCI) transmission device applied to a network equipment, including:

a processing module configured to determine a DCI format for transmitting the downlink control information (DCI), the DCI format including: a time domain resource allocation field, an aggregation transmission indication field, a first indication field or a second indication field, the first indication field indicating a configuration value of a time domain resource and a configuration value of a modulation order, the second indication field indicating a configuration value of a time domain resource and a configuration value of an aggregate transmission indication; and

a transceiver module configured to transmit the DCI according to the DCI format.

In a third aspect, an embodiment of the present disclosure provides a network equipment, including:

a processor configured to determine a DCI format for transmitting the downlink control information (DCI), the DCI format including: a time domain resource allocation field, an aggregation transmission indication field, a first indication field or a second indication field, the first indication field indicating a configuration value of a time domain resource and a configuration value of a modulation order, the second indication field indicating a configuration value of a time domain resource and a configuration value of an aggregate transmission indication; and

a transceiver configured to transmit the DCI according to the DCI format.

In a fourth aspect, an embodiment of the present disclosure provides a network equipment, including a processor, a storage, and a computer program stored on the storage and capable of running on the processor, the processor implementing, when executing the computer program, the steps of the downlink control information (DCI) transmission method as described above.

In a fifth aspect, an embodiment of the present disclosure provides a computer readable storage medium having a computer program stored thereon, the computer program implementing, when executed by a processor, the steps of the downlink control information (DCI) transmission method as described above.

Thus, the downlink control information (DCI) transmission method according to the embodiment of the present disclosure includes: determines a DCI format for transmitting the downlink control information (DCI), the DCI format including: a time domain resource allocation field, an aggregation transmission indication field, a first indication field or a second indication field, the first indication field indicating a configuration value of a time domain resource and a configuration value of a modulation order, the second indication field indicating a configuration value of a time domain resource and a configuration value of an aggregate transmission indication; and transmits the DCI according to the DCI format; therefore, DCI configured with a smaller payload is achieved, and under the limited resource configuration, the code rate of the PDCCH is reduced, and the coverage of the PDCCH is improved.

