Patent ID: 8804651

Claim:
A method for generating demodulation reference signal (DMRS) sequences in a communication system, comprising: determining, by an access network device, quantity of transmission layers of a user equipment (UE) for transmitting uplink data; selecting, by the access network device, 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; generating, by the access network device, 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; sending, by the access network device, the control signaling to the UE; and receiving, by the access network device, 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.