Method for latency measurement and apparatus therefor
End-to-end latency measurement scheme is discloses. In this scheme, the UE receives a request message from a network. This request message requests the UE to report transmission or reception timing information. And, the transmission or reception timing information may be for a latency measurement. Thereafter, the UE transmits the transmission or reception timing information to the network.
1. A method for a user equipment (UE) including a receiver, a transmitter, and a processor, to operate in a wireless communication system, the method comprising:
receiving, by the receiver, a request message from a network, wherein the request message requests the UE to report transmission or reception timing information, the processor having an architecture comprising a layer 1 (L1) corresponding to a PHY (physical) layer, a layer 2 (L2) corresponding to a MAC (medium access control) layer, and a layer 3 (L3) corresponding to an RRC (Radio Resource Control) layer, the transmission or reception timing information being timing information on which a data unit is transmitted or received by the layer 2 of the processor to or from another layer of the processor; and
transmitting, by the transmitter, a wireless signal including the transmission or reception timing information to the network through a radio resource.
2. The method of claim 1 , wherein the transmission or reception timing information of the data unit is transmission timing information when the transmission or reception timing information is used for an uplink latency measurement.
3. The method of claim 2 , wherein the UE transmits the transmission timing information with user data other than the transmission timing information.
4. The method of claim 3 , wherein the user data is an SDU (service data unit).
5. The method of claim 4 , wherein the transmission timing information informs the network of a timing on which the SDU is transmitted from the layer 2 (L2) to the layer 1 (L1).
6. The method of claim 4 , wherein the transmission timing information informs the network of a timing on which the SDU is received from the layer 3 (L3) to the layer 2 (L2).
7. The method of claim 1 , wherein the transmission or reception timing information of the data unit is reception timing information when the transmission or reception timing information is used for a downlink latency measurement.
8. The method of claim 7 , wherein:
the UE stores the reception timing information; and
wherein the UE transmits the stored reception timing information to the network.
9. The method of claim 8 , wherein the data unit is an SDU (service data unit).
10. The method of claim 9 , wherein the reception timing information informs the network of a timing on which the SDU is received from the layer 2 (L2) to the layer 1 (L1).
11. The method of claim 9 , wherein the reception timing information informs the network of a timing on which the SDU is transmitted to the layer 3 (L3) to the layer 2 (L2).
12. The method of claim 1 , wherein the transmission or reception timing information is used in a process of MDT (Minimization of Drive Test).
13. A user equipment (UE) operating in a wireless communication system, the UE comprising:
a processor having an architecture comprising:
a layer 1 (L1) corresponding to a PHY (physical) layer;
a layer 2 (L2) corresponding to a MAC (medium access control) layer; and
a layer 3 (L3) corresponding to an RRC (Radio Resource Control) layer;
a receiver configured to receive a request message from a network, the request message requesting the UE to report transmission or reception timing information, the transmission or reception timing information being timing information on which a data unit is transmitted or received by the layer 2 of the processor to or from another layer of the processor; and
a transmitter configured to transmit a wireless signal including the transmission or reception timing information to the network.