Method for reconfiguring a PDCP reordering timer in a wireless communication system and device therefor
A method for a User Equipment (UE) operating in a wireless communication system, the method includes stopping a Packet Data Convergence Protocol (PDCP) reordering timer, while the PDCP reordering timer is running, when a value of the PDCP reordering timer is reconfigured by upper layers; restarting the PDCP reordering timer; and setting a value of reordering_PDCP_RX_COUNT of a reordering function corresponding to the restarted PDCP reordering timer to a COUNT value associated to RX_HFN and Next_PDCP_RX_SN.
1. A method for a User Equipment (UE) operating in a wireless communication system, the method comprising:
stopping a Packet Data Convergence Protocol (PDCP) reordering timer, while the PDCP reordering timer is running, when a value of the PDCP reordering timer is reconfigured by upper layers;
restarting the PDCP reordering timer; and
setting a value of reordering_PDCP_RX_COUNT of a reordering function corresponding to the restarted PDCP reordering timer to a COUNT value associated to RX_HFN and Next_PDCP_RX_SN.
2. The method according to claim 1 , wherein the PDCP reordering timer restarts with the value of the PDCP reordering timer indicated by the upper layers.
3. The method according to claim 1 , wherein the value of the PDCP reordering timer is received on a Radio Resource Control (RRC) message.
4. The method according to claim 1 , wherein the reordering_PDCP_RX_COUNT is used only when the reordering function is used, and
a value of the reordering_PDCP_RX_COUNT is a value of a COUNT following a COUNT value associated with a PDCP Protocol Data Unit (PDU) which triggered a PDCP reordering timer.
5. The method according to claim 1 , wherein a variable of the RX_HFN indicates a Hyper Frame Number (HFN) value for generation of a COUNT value used for a received PDCP PDUs for a PDCP entity.
6. The method according to claim 1 , wherein a variable of the Next_PDCP_RX_SN indicates a next expected PDCP Sequence Number (SN) by a receiver for a PDCP entity.
7. A User Equipment (UE) for operating in a wireless communication system, the UE comprising:
a Radio Frequency (RF) module; and
a processor operably coupled with the RF module and configured to:
stop a Packet Data Convergence Protocol (PDCP) reordering timer, while the PDCP reordering timer is running, when a value of the PDCP reordering timer is reconfigured by upper layers;
restart the PDCP reordering timer; and
set a value of reordering_PDCP_RX_COUNT of a reordering function corresponding to the restarted PDCP reordering timer to a COUNT value associated to RX_HFN and Next_PDCP_RX_SN.
8. The UE according to claim 7 , wherein the PDCP reordering timer restarts with the value of the PDCP reordering timer indicated by the upper layers.
9. The UE according to claim 7 , wherein the value of the PDCP reordering timer is received on a Radio Resource Control (RRC) message.
10. The UE according to claim 7 , wherein the reordering PDCP_RX_COUNT is used only when the reordering function is used, and
a value of the reordering_PDCP_RX_COUNT is a value of a COUNT following a COUNT value associated with a PDCP Protocol Data Unit (PDU) which triggered a corresponding PDCP reordering timer.
11. The UE according to claim 7 , wherein a variable of the RX_HFN indicates a Hyper Frame Number (HFN) value for generation of a COUNT value used for a received PDCP PDUs for a PDCP entity.
12. The UE according to claim 7 , wherein a variable of the Next_PDCP_RX_SN indicates a next expected PDCP Sequence Number (SN) by a receiver for a PDCP entity.