Method and apparatus for combining UL data with a feedback of DL data in a wireless communication system

1. A method performed by a wireless device in a wireless communication system, the method comprising:

receiving, from a network, system information for specific downlink (DL) data,

wherein the system information includes an indicator informing a transmission type for the specific DL data,

wherein the transmission type for the specific DL data is one of (1) a first transmission type in which a single uplink (UL) transmission for application level UL data, subsequent to the specific DL data, is expected, (2) a second transmission type in which no further UL transmission for application level UL data, subsequent to the specific DL data, is expected, or (3) a third transmission type in which multiple UL transmissions of application level UL data, subsequent to the specific DL data, are expected;

receiving, from the network, a paging for the specific DL data;

initiating random access procedure for mobile-terminated (MT) early data transmission (EDT);

transmitting, to the network, a random access preamble in the random access procedure;

receiving, from the network, a random access response message in response to the random access preamble in the random access procedure;

transmitting, to the network, a random access message 3 in response to the random access response message in the random access procedure; and

receiving, from the network, a random access message 4 including the specific DL data in response to the random access message 3 in the random access procedure,

wherein the method further comprises:

(1) based on the indicator informing the first transmission type for the specific DL data:

starting a timer upon receiving the random access message 4 including the specific DL data;

based on receiving, by a radio resource control (RRC) layer of the wireless device from at least one application layer of the wireless device, application level UL data while the timer is running, transmitting, to the network, a single UL signaling including both the application level UL data and a hybrid automatic repeat request (HARQ) positive acknowledgement (ACK) for the specific DL data,

wherein the application level UL data and the HARQ ACK are multiplexed in a single medium access control (MAC) Protocol Data Unit (PDU); and

based on not receiving the application level UL data while the timer is running, transmitting, to the network, a HARQ negative acknowledgement (NACK) for the specific DL data via a Non-access stratum (NAS) message;

(2) based on the indicator informing the second transmission type for the specific DL data:

transmitting a HARQ ACK or a HARQ NACK for the specific DL data via RRC signalling; and

transitioning to RRC_IDLE or RRC_INACTIVE upon receiving the specific DL data; and

(3) based on the indicator informing the third transmission type for the specific DL data:

transitioning to RRC_CONNECTED upon receiving the random access message 4 including the specific DL data; and

performing the multiple UL transmissions of application level UL data, subsequent to the specific DL data, in the RRC_CONNECTED.

2. The method of claim 1 ,

wherein the application level UL data is generated by the at least one application layer while the timer is running.

3. The method of claim 1 , wherein the DL data is an application level DL data.

4. The method of claim 1 , wherein the wireless device is in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.

5. A wireless device in a wireless communication system comprising:

a transceiver;

a memory; and

at least one processor operatively coupled to the transceiver and the memory, and configured to:

control the transceiver to receive, from a network, system information for specific downlink (DL) data,

wherein the system information includes an indicator informing a transmission type for the specific DL data,

wherein the transmission type for the specific DL data is one of (1) a first transmission type in which a single uplink (UL) transmission for application level UL data, subsequent to the specific DL data, is expected, (2) a second transmission type in which no further UL transmission for application level UL data, subsequent to the specific DL data, is expected, or (3) a third transmission type in which multiple UL transmissions of application level UL data, subsequent to the specific DL data, are expected;

control the transceiver to receive, from the network, a paging for the specific DL data;

initiate random access procedure for mobile-terminated (MT) early data transmission (EDT);

control the transceiver to transmit, to the network, a random access preamble in the random access procedure;

control the transceiver to receive, from the network, a random access response message in response to the random access preamble in the random access procedure;

control the transceiver to transmit, to the network, a random access message 3 in response to the random access response message in the random access procedure; and

control the transceiver to receive, from the network, a random access message 4 including the specific DL data in response to the random access message 3 in the random access procedure,

wherein the at least one processor is further configured to:

(1) based on the indicator informing the first transmission type for the specific DL data:

start a timer upon receiving the random access message 4 including the specific DL data;

based on receiving, by a radio resource control (RRC) layer of the wireless device from at least one application layer of the wireless device, application level UL data while the timer is running, control the transceiver to transmit, to the network, a single UL signaling including both the application level UL data and a hybrid automatic repeat request (HARQ) positive acknowledgement (ACK) for the specific DL data,

wherein the application level UL data and the HARQ ACK are multiplexed in a single medium access control (MAC) Protocol Data Unit (PDU); and

based on not receiving the application level UL data while the timer is running, control the transceiver to transmit, to the network, a HARQ negative acknowledgement (NACK) for the specific DL data via a Non-access stratum (NAS) message;

(2) based on the indicator informing the second transmission type for the specific DL data:

control the transceiver to transmit a HARQ ACK or a HARQ NACK for the specific DL data via RRC signalling; and

transition to RRC_IDLE or RRC_INACTIVE upon receiving the specific DL data; and

(3) based on the indicator informing the third transmission type for the specific DL data:

transition to RRC_CONNECTED upon receiving the random access message 4 including the specific DL data; and

control the transceiver to perform the multiple UL transmissions of application level UL data, subsequent to the specific DL data, in the RRC_CONNECTED.

6. A non-transitory computer-readable medium having stored thereon a plurality of instructions, which, when executed by a processor of a wireless device, cause the wireless device to:

receive, from a network, system information for specific downlink (DL) data,

wherein the system information includes an indicator informing a transmission type for the specific DL data,

wherein the transmission type for the specific DL data is one of (1) a first transmission type in which a single uplink (UL) transmission for application level UL data, subsequent to the specific DL data, is expected, (2) a second transmission type in which no further UL transmission for application level UL data, subsequent to the specific DL data, is expected, or (3) a third transmission type in which multiple UL transmissions of application level UL data, subsequent to the specific DL data, are expected;

receive, from the network, a paging for the specific DL data;

initiate random access procedure for mobile-terminated (MT) early data transmission (EDT);

transmit, to the network, a random access preamble in the random access procedure;

receive, from the network, a random access response message in response to the random access preamble in the random access procedure;

transmit, to the network, a random access message 3 in response to the random access response message in the random access procedure; and

receive, from the network, a random access message 4 including the specific DL data in response to the random access message 3 in the random access procedure,

wherein the plurality of instructions further cause the wireless device to:

(1) based on the indicator informing the first transmission type for the specific DL data:

start a timer upon receiving the random access message 4 including the specific DL data;

based on receiving, by a radio resource control (RRC) layer of the wireless device from at least one application layer of the wireless device, application level UL data while the timer is running, transmit, to the network, a single UL signaling including both the application level UL data and a hybrid automatic repeat request (HARQ) positive acknowledgement (ACK) for the specific DL data,

wherein the application level UL data and the HARQ ACK are multiplexed in a single medium access control (MAC) Protocol Data Unit (PDU); and

based on not receiving the application level UL data while the timer is running, transmit, to the network, a HARQ negative acknowledgement (NACK) for the specific DL data via a Non-access stratum (NAS) message;

(2) based on the indicator informing the second transmission type for the specific DL data:

transmit a HARQ ACK or a HARQ NACK for the specific DL data via RRC signalling; and

transition to RRC_IDLE or RRC_INACTIVE upon receiving the specific DL data; and

(3) based on the indicator informing the third transmission type for the specific DL data:

transition to RRC_CONNECTED upon receiving the random access message 4 including the specific DL data; and

perform the multiple UL transmissions of application level UL data, subsequent to the specific DL data, in the RRC_CONNECTED.