Method and apparatus for transmitting dmrs

A method for obtaining a demodulation reference signal (DMRS), comprising:

• determining a time-frequency resource used to carry a DMRS, wherein
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a code division multiplexing (CDM) manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• or
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a CDM manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol and a second symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol and the second symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol and the second symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• and
• obtaining the DMRS by using the time-frequency resource.

An indication method, comprising:

• generating indication information, wherein the indication information is used to indicate a time-frequency resource used to carry a demodulation reference signal (DMRS), wherein
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a code division multiplexing (CDM) manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• or
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a CDM manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol and a second symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol and the second symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol and the second symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• and
• sending the indication information.

A method for determining a time-frequency resource, comprising:

• receiving indication information, wherein the indication information is used to indicate a time-frequency resource used to carry a demodulation reference signal (DMRS), wherein
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a code division multiplexing (CDM) manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• or
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a CDM manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol and a second symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol and the second symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol and the second symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• and
• determining the time-frequency resource based on the indication information.

An apparatus for sending a demodulation reference signal (DMRS), comprising:

• a memory;
• and
• a processor, configured to perform following method:
• determining a time-frequency resource used to carry a DMRS, wherein
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a code division multiplexing (CDM) manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• or
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a CDM manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol and a second symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol and the second symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol and the second symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• and
• sending the DMRS by using the time-frequency resource.

An apparatus for obtaining a demodulation reference signal (DMRS), comprising:

• a memory;
• and
• a processor, configured to perform following method:
• determining a time-frequency resource used to carry a DMRS, wherein
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a code division multiplexing (CDM) manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• or
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a CDM manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol and a second symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol and the second symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol and the second symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• and
• obtaining the DMRS by using the time-frequency resource.

An indication apparatus, comprising:

• a memory;
• and
• a processor, configured to perform following method:
• generating indication information, wherein the indication information is used to indicate a time-frequency resource used to carry a demodulation reference signal (DMRS), wherein
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a code division multiplexing (CDM) manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• or
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a CDM manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol and a second symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol and the second symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol and the second symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• and
• sending the indication information.

An apparatus for determining a time-frequency resource, comprising:

• a memory;
• and
• a processor, configured to perform following method:
• receiving indication information, wherein the indication information is used to indicate a time-frequency resource used to carry a demodulation reference signal (DMRS), wherein
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a code division multiplexing (CDM) manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• or
• the DMRS is carried in at least one resource unit;
• and if a total quantity of system-supported DMRS ports is 6, the six DMRS ports are divided into three DMRS port groups, each DMRS port group comprises two DMRS ports, the three DMRS port groups comprise a first DMRS port group, a second DMRS port group, and a third DMRS port group, and a same time-frequency resource is multiplexed for the DMRS ports in each DMRS port group in a CDM manner, in each resource unit, a time-frequency resource to which the first DMRS port group is mapped comprises a subcarrier 12n, a subcarrier 12n+1, a subcarrier 12n+6, and a subcarrier 12n+7 that are in a first symbol and a second symbol in time domain, a time-frequency resource to which the second DMRS port group is mapped comprises a subcarrier 12n+2, a subcarrier 12n+3, a subcarrier 12n+8, and a subcarrier 12n+9 that are in the first symbol and the second symbol in time domain, and a time-frequency resource to which the third DMRS port group is mapped comprises a subcarrier 12n+4, a subcarrier 12n+5, a subcarrier 12n+10, and a subcarrier 12n+11 that are in the first symbol and the second symbol in time domain, wherein n is any one or more integers greater than or equal to 0 and less than └M/12┘, M is a quantity of subcarriers of each resource unit in frequency domain, and M is an integer greater than or equal to 1;
• and
• determining the time-frequency resource based on the indication information.