Uplink transmission method, terminal, and network side device
The disclosure provides an uplink transmission method, a terminal, and a network side device. The method includes: pre-allocating, by a network side device, an uplink transmission time-frequency resource to a terminal, and storing, by the terminal, the uplink transmission resource; and when the terminal needs to send a data packet, sending, by the terminal, the data packet to the network side device by using the uplink transmission resource, where the data packet includes indication information, the indication information is used to indicate whether the data packet is initially transmitted by the terminal or the data packet is retransmitted by the terminal, and the network side device can correctly receive the data packet and perform combination processing on the data packet based on the indication information. According to embodiments of the disclosure, reliability of grant-free transmission can be ensured, and communication performance can be effectively improved.
1. An uplink transmission method, comprising:
receiving, by a network side device, a data packet sent by a terminal to the network side device by using a pre-allocated uplink transmission resource, wherein the data packet comprises indication information including a resource block assignment (RBA) indicator used to determine whether the data packet is initially transmitted by the terminal or the data packet is retransmitted by the terminal, wherein the RBA indicates a size and a location of a time-frequency resource; and
performing, by the network side device, combination processing on the data packet based on the indication information, wherein the network side device determines, based on a redundancy version (RV), a current quantity of retransmission times and whether the data packet is an initially transmitted data packet or a retransmitted data packet, and combines an initially transmitted data packet and a retransmitted data packet that are transmitted in a same hybrid automatic repeat request (HARQ) process;
wherein the indication information received by the transceiver is further used to indicate whether a data packet to be sent next time by the terminal is transmitted by using the pre-allocated uplink transmission resource or is transmitted by using an uplink transmission resource allocated by the network side device as re-requested;
wherein the indication information received by the transceiver is a buffer status report (BSR);
wherein the transceiver detects a data packet on an uplink transmission resource that is jointly used by an initially transmitted data packet and a retransmitted data packet, the data packet comprises control information, and the indication information is carried in the control information; and
then the network side device determines, based on a correspondence between a quantity of retransmission times and transmission bandwidth, transmission bandwidth corresponding to the current quantity of retransmission times.
2. A network side device, comprising:
a transceiver, configured to receive a data packet sent by a terminal to the network side device by using a pre-allocated uplink transmission resource, wherein the data packet comprises indication information including a resource block assignment (RBA) indicator used to determine whether the data packet is initially transmitted by the terminal or the data packet is retransmitted by the terminal, wherein the RBA indicates a size and a location of a time-frequency resource; and
a processor, configured to:
perform combination processing on the data packet based on the indication information,
determine, based on a redundancy version (RV), a current quantity of retransmission times and whether the data packet is an initially transmitted data packet or a retransmitted data packet,
wherein the indication information received by the transceiver is further used to indicate whether a data packet to be sent next time by the terminal is transmitted by using the pre-allocated uplink transmission resource or is transmitted by using an uplink transmission resource allocated by the network side device as re-requested;
wherein the indication information received by the transceiver is a buffer status report (BSR);
wherein the transceiver detects a data packet on an uplink transmission resource that is jointly used by an initially transmitted data packet and a retransmitted data packet, the data packet comprises control information, and the indication information is carried in the control information,
determine, based on a correspondence between a quantity of retransmission times and transmission bandwidth, transmission bandwidth corresponding to the current quantity of retransmission times, and
combine an initially transmitted data packet and a retransmitted data packet that are transmitted in a same hybrid automatic repeat request (HARQ) process.
3. The network side device according to claim 2 , wherein the indication information comprises one or more of the following parameters: HARQ process identity (ID), a new data indicator (NDI), and the redundancy version (RV).
4. The network side device according to claim 2 , wherein the data packet comprises a reference signal, and the indication information received by the transceiver is carried in the reference signal.
5. The network side device according to claim 2 , wherein the processor determines, based on a HARQ process ID, the HARQ process in which the terminal sends the data packet, and combines the initially transmitted data packet and the retransmitted data packet that are transmitted in the same HARQ process.