Method and apparatus for handling failure of early data transmission in wireless communication system
A method and apparatus for transmitting data in a wireless communication system is provided. A user equipment (UE) transmits the data in a first cell during a first random access procedure, i.e. early data transmission. The UE detects that transmission of the data in the first cell during the first random access procedure has failed, and prioritizes a second cell based on candidate cell information. After selecting the second cell, the UE transmits a failed part of the data in the second cell during a second random access procedure.
1. A method for transmitting data by a user equipment (UE) in a wireless communication system, the method comprising:
transmitting the data in a first cell during a first random access procedure;
detecting that transmission of the data in the first cell during the first random access procedure has failed;
prioritizing a second cell based on candidate cell information; and
transmitting a failed part of the data in the second cell during a second random access procedure.
2. The method of claim 1 , wherein the first cell and the second cell support an early data transmission which corresponds to a data transmission during a random access procedure.
3. The method of claim 1 , wherein the data is transmitted in the first cell via a first MSG3 of the first random access procedure.
4. The method of claim 1 , wherein the failed part of the data is transmitted in the second cell via a second MSG3 of the second random access procedure.
5. The method of claim 1 , wherein the candidate cell information includes a list of candidate cells supporting a data transmission during a random access procedure.
6. The method of claim 5 , wherein the candidate cell information is received from the first cell via system information.
7. The method of claim 1 , wherein the candidate cell information includes information on a candidate cell supporting a data transmission during a random access procedure.
8. The method of claim 7 , wherein the candidate cell information is received from the first cell via a dedicated signaling.
9. The method of claim 8 , wherein the dedicated signaling indicates that transmission of the data in the first cell during the first random access procedure has failed.
10. The method of claim 1 , wherein the candidate cell information includes information about a cell on which the UE had previously succeeded a data transmission during a random access procedure.
11. The method of claim 1 , wherein the candidate cell information is obtained by performing measurements on neighbor cells.
12. The method of claim 1 , further comprising transmitting a part of the data which is yet transmitted, in the second cell during the second random access procedure.
13. The method of claim 1 , wherein the UE is in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the UE.
14. A user equipment (UE) in a wireless communication system, the UE comprising:
a memory;
a transceiver; and
a processor, coupled to the memory and the transceiver, that:
controls the transceiver to transmit the data in a first cell during a first random access procedure,
detects that transmission of the data in the first cell during the first random access procedure has failed,
prioritizes a second cell based on candidate cell information, and controls the transceiver to transmit a failed part of the data in the second cell during a second random access procedure.