Data transmission method and device
The present disclosure relates to the field of wireless communication technology, and provides a data transmission method and a data transmission device, so as to solve the problem in the related art where, for 5G application scenarios, in the case that an uplink scheduling algorithm for a conventional 4G system continues to be used, a large number of control signaling overheads are required due to the meteoric growth in the number of UEs to be connected. In the present disclosure, a network side device determines non-orthogonal multiple access basic transmission units allocated to UEs, detects a pilot signal from each UE on the corresponding non-orthogonal multiple access basic transmission unit, and in the case that the pilot signal has been detected, performs data detection on the UE which has transmitted the pilot signal through the non-orthogonal multiple access basic transmission unit.
1. A data transmission method used in a telecommunications system comprising a network side device and User Equipments (UEs), the method comprising:
determining, by the network side device, non-orthogonal multiple access basic transmission units allocated to the UEs, each non-orthogonal multiple access basic transmission unit corresponding to a time-frequency resource, a pattern vector resource and a pilot resource, wherein the pattern vector resource corresponding to the non-orthogonal multiple access basic transmission unit comprises one column of a non-orthogonal multiple access (NOMA) pattern matrix as a basic unit;
detecting, by the network side device, a pilot signal from each UE on the non-orthogonal multiple access basic transmission unit corresponding to the UE; and
in the case that the pilot signal has been detected, performing, by the network side device, data detection on the UE, which has transmitted the pilot signal, through the non-orthogonal multiple access basic transmission unit,
wherein the step of determining, by the network side device, the non-orthogonal multiple access basic transmission units allocated to the UEs comprises: allocating, by the network side device, the non-orthogonal multiple access basic transmission units with pattern vectors having different diversities to the UEs in the NOMA pattern matrix in accordance with distances between the UEs and the network side device;
wherein the non-orthogonal multiple access basic transmission unit with a pattern vector having a high diversity is allocated by the network side device to the UE at a large distance from the network side device; and
wherein the diversity refers to the number of elements whose values are one appeared in a Pattern Division Multiple Access (PDMA) pattern vector in the NOMA pattern matrix.
2. The data transmission method according to claim 1 , wherein a time-domain resource corresponding to the non-orthogonal multiple access basic transmission unit comprises one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols as a basic unit;
a frequency-domain resource corresponding to the non-orthogonal multiple access basic transmission unit comprises a group of frequency-domain subcarriers as a basic unit, and the number of subcarriers comprised in the group of frequency-domain subcarriers is an integral multiple of the number of rows of the non-orthogonal multiple access (NOMA) pattern matrix; and
the pilot resource corresponding to the non-orthogonal multiple access basic transmission unit comprises one of a group of orthogonal pilot signal sets as a basic unit.
3. The data transmission method according to claim 1 , wherein the step of determining, by the network side device, the non-orthogonal multiple access basic transmission units allocated to the UEs comprises:
determining, by the network side device, the non-orthogonal multiple access basic transmission units allocated to the UEs in accordance with UE information, the UE information about different UEs having different values.
4. The data transmission method according to claim 1 , wherein after the network side device has detected the pilot signal from each UE of a plurality of UEs on the non-orthogonal multiple access basic transmission unit corresponding to the UE of the plurality of UEs, the data transmission method further comprises:
in the case that there is a pilot signal conflict between the UE and the other UEs of the plurality of UEs, scheduling, by the network side device, the UE to perform the data transmission on a reserved scheduling time-frequency resource, and notifying, through downlink signaling, a previously presented non-orthogonal multiple access basic transmission unit allocated to the UE; or
in the case that there is the pilot signal conflict between the UE and the other UEs of the plurality of UEs, notifying, by the network side device, the UE that there is a multi-user pilot signal conflict through downlink signaling.
5. The data transmission method according to claim 1 , wherein after the network side device has detected the pilot signal, the data transmission method further comprises performing, by the network side device, pilot channel estimation on the UE that has transmitted the pilot signal through the non-orthogonal multiple access basic transmission unit.
6. A network side device used in a telecommunications system comprising the network side device and User Equipments (UEs), the network side device comprising a processor, a transceiver and a memory, wherein
the processor is configured to read a program stored in the memory, so as to: determine non-orthogonal multiple access basic transmission units allocated to the UEs, each non-orthogonal multiple access basic transmission unit corresponding to a time-frequency resource, a pattern vector resource and a pilot resource, wherein the pattern vector resource corresponding to the non-orthogonal multiple access basic transmission unit comprises one column of a non-orthogonal multiple access (NOMA) pattern matrix as a basic unit; detect a pilot signal from each UE on the non-orthogonal multiple access basic transmission unit corresponding to the UE; and in the case that the pilot signal has been detected, perform data detection on the UE, which has transmitted the pilot signal, through the non-orthogonal multiple access basic transmission unit,
the transceiver is configured to receive and transmit data, and
the memory is configured to store therein data for the operation of the processor,
wherein the processor is further configured to: allocate the non-orthogonal multiple access basic transmission units with pattern vectors having different diversities to the UEs in the NOMA pattern matrix in accordance with distances between the UEs and the network side device;
wherein the non-orthogonal multiple access basic transmission unit with a pattern vector having a high diversity is allocated by the network side device to the UE at a large distance from the network side device; and
wherein the diversity refers to the number of elements whose values are one appeared in a Pattern Division Multiple Access (PDMA) pattern vector in the NOMA pattern matrix.
7. The network side device according to claim 6 , wherein a time-domain resource corresponding to the non-orthogonal multiple access basic transmission unit comprises one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols as a basic unit;
a frequency-domain resource corresponding to the non-orthogonal multiple access basic transmission unit comprises a group of frequency-domain subcarriers as a basic unit, and the number of subcarriers comprised in the group of frequency-domain subcarriers is an integral multiple of the number of rows of the non-orthogonal multiple access (NOMA) pattern matrix; and
the pilot resource corresponding to the non-orthogonal multiple access basic transmission unit comprises one of a group of orthogonal pilot signal sets as a basic unit.
8. The network side device according to claim 6 , wherein the network side device is further configured to:
determine the non-orthogonal multiple access basic transmission units allocated to the UEs in accordance with UE information, the UE information about different UEs having different values.
9. The network side device according to claim 6 , wherein the network side device is further configured to:
in the case that there is a pilot signal conflict between the UE and the other UEs of the plurality of UEs, schedule the UE to perform the data transmission on a reserved scheduling time-frequency resource, and notify, through downlink signaling, the UE to be mapped to a previously presented non-orthogonal multiple access basic transmission unit; or
in the case that there is a pilot signal conflict between the UE and the other UEs of the plurality of UEs, notify the UE that there is a multi-user pilot signal conflict through downlink signaling,
wherein the network side device is further configured to, after the network side device has detected the pilot signal, perform pilot channel estimation on the UE that has transmitted the pilot signal through the non-orthogonal multiple access basic transmission unit.