Method and device for generating demodulation reference signal sequences

A method for generating demodulation reference signal (DMRS) sequences in a communication system, comprising:

• receiving, by a user equipment (UE), a control signaling from an access network device, wherein the control signaling comprises quantity of the transmission layers of the UE for transmitting uplink data, and an item number, wherein the item number corresponds to an combination item among a plurality of predetermined combination items, wherein the combination item comprises N combinations of a Cyclic Shift (CS) resource and an Orthogonal Cover Code (OCC) sequence, the N combinations correspond to N transmission layers supported by the communication system, wherein N is an integer larger than or equal to the quantity of transmission layers of the UE for transmitting uplink data;
• and wherein one combination is used for generating a DMRS sequence for each transmission layer of the UE;
• determining, by the UE, a combination of a CS resource and an OCC sequence for each of the transmission layers of the UE for transmitting uplink data according to the control signaling;
• and
• generating, by the UE, a DMRS, sequence for each of the transmission layers of the UE by using the selected combination of the CS resource and the OCC sequence corresponding to the transmission layer;
• and
• sending, by the UE, the DMRS sequences to the access network device,
• wherein the DMRS sequences are such that spacing between the CS resources for generating the DMRS sequences corresponding to transmission layers mapped to a same codeword is larger than spacing between the CS resources for generating the DMRS sequences corresponding to transmission layers mapped to different codewords.

An access network device, comprising a processor and a memory storing a program product for use by the processor, wherein the program product comprises the following functional units:

• a determination unit, configured to determine quantity of transmission layers of a user equipment (UE) for transmitting uplink data;
• a configuration selection unit, configured to select, a combination item among a plurality of predetermined combination items, wherein the combination item comprises N combinations of a Cyclic Shift (CS) resource and an Orthogonal Cover Code (OCC) sequence, the N combinations correspond to N transmission layers supported by the communication system, wherein N is an integer larger than or equal to the quantity of transmission layers of the UE for transmitting uplink data;
• and one combination is used for generating a DMRS sequence for each transmission layer of the UE;
• an indication unit, configured to generate a control signaling containing the determined quantity of the transmission layers of the UE for transmitting uplink data, and an item number corresponding to the selected combination item, and cause the control signaling to be sent to the UE;
• and
• a receiver, configured to receive the DMRS sequences generated by the UE according to the control signaling,
• wherein the DMRS sequences are such that spacing between the CS resources for generating the DMRS sequences corresponding to transmission layers mapped to a same codeword is larger than spacing between the CS resources for generating the DMRS sequences corresponding to transmission layers mapped to different codewords.

A user equipment (UE), comprising a processor and a memory storing a program product for use by the processor, wherein the program product comprises the following functional units:

• a receiving unit, configured to receive a control signaling from an access network device, wherein the control signaling comprises quantity of the transmission layers of the UE for transmitting uplink data, and an item number, wherein the item number corresponds to an combination item among a plurality of predetermined combination items, wherein the combination item comprises N combinations of a Cyclic Shift (CS) resource and an Orthogonal Cover Code (OCC) sequence, the N combinations correspond to N transmission layers supported by a communication system, wherein N is an integer larger than or equal to the quantity of transmission layers of the UE for transmitting uplink data;
• and wherein one combination is used for generating a DMRS sequence for each transmission layer of the UE;
• a configuration determination unit, configured to determine a combination of a CS resource and an OCC sequence for each of the transmission layers of the UE for transmitting uplink data according to the control signaling;
• and
• a generation unit, configured to generate a DMRS sequence for each of the transmission layers of the UE by using the selected combination of the CS resource and the OCC sequence corresponding to the transmission layer;
• and
• a sending unit, configured to cause the DMRS sequences to be sent to the access network device,
• wherein the DMRS sequences are such that spacing between the CS resources for generating the DMRS sequences corresponding to transmission layers mapped to a same codeword is larger than spacing between the CS resources for generating the DMRS sequences corresponding to transmission layers mapped to different codewords.