Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for establishing layer-2 entities for D2D communication system, the method comprising: configuring a sidelink radio bearer over which the UE transmits data to a peer UE; establishing RLC (Radio Link Control) and PDCP (Packet Data Convergence Protocol) entities for the sidelink radio bearer; and transmitting configuration information of the sidelink radio bearer via a sidelink to the peer UE, wherein the UE is directly connected to the peer UE via the sidelink.
Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for canceling scheduling requests triggered by a sidelink buffer status report in a D2D communication system, the method comprising: receiving an uplink grant while one or more Scheduling Requests (SRs) are pending, wherein all of the one or more SRs are triggered by sidelink Buffer Status Report (BSR); generating a MAC (Medium Access Control) PDU (Protocol Data Unit); and canceling the all of the one or more pending SRs if the MAC PDU includes a sidelink BSR MAC CE (Medium Access Control Control Element).
Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for transmitting, by a user equipment (UE), data in a wireless communication system, the method comprising: receiving a first uplink grant for a logical channel group (LCG) and a first LCG indicator of the LCG; generating a Medium Access Control Protocol Data Unit (MAC PDU) containing a data of only the LCG indicated by the first LCG indicator; and transmitting the MAC PDU using the first uplink grant.
Abstract:
There is provided a method for reporting a power headroom. The method may comprise: establishing, by a user equipment (UE), connections with plural base stations, each of which includes one or more cells; determining, by the UE, a power headroom for at least one base station among the plural base stations; and triggering, by the UE, a power headroom reporting (PHR) including the determined power headroom.
Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for reporting an RLC (Radio Link Control) re-transmission failure in the wireless communication system, the method comprising: receiving, from a base station (BS), an indicator indicating a radio bearer (RB) which the UE reports a RLC retransmission error to the BS; and reporting, to a BS, an Radio Link Control (RLC) retransmission error if the RLC retransmission error occurs in the RB indicated by the indicator.
Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for indicating a ciphering indication for a sidelink radio bearer in a D2D communication system, the method comprising: receiving a PDCP SDU when the UE is configured to communicate with one or more other UEs directly; deciding whether to apply ciphering or not for the received PDCP SDU; generating a PDCP data PDU including the received PDCP SDU and a PDCP PDU header including one or more fields for ciphering parameters; and transmitting the PDCP data PDU to the one or more other UEs over PC5 interface, wherein at least one of the one or more fields for ciphering parameters is set to a fixed value when the ciphering is not applied for the received PDCP SDU.
Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for counting a DRX (Discontinuous Reception) timer in a carrier aggregation system, the method comprising: configuring a plurality of cells including at least one FDD (Frequency Division Duplex) serving cell and at least one TDD (Time Division Duplex) serving cell; and counting a DRX timer in a subframe, wherein the subframe is an uplink subframe for all TDD serving cells.
Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for triggering power headroom reporting in a dual connectivity system, the method comprising: configuring a plurality of Medium Access Control (MAC) entities, each MAC entity corresponding to each enhanced-NodeB (eNB); occurring an event for triggering power headroom reporting (PHR) in a MAC entity of the plurality of MAC entities; triggering the PHR in the plurality of MAC entities including the MAC entity if a type of the event is a first type event; and triggering the PHR in the MAC entity if the type of the event is a second type event.
Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for reconfiguring a PDCP reordering timer in wireless communication system, the method comprising: starting a PDCP (Packet Data Convergence Protocol) reordering timer; receiving an RRC (Radio Resource Control) message indicating that a new value is used for the PDCP reordering timer; re-starting the PDCP reordering timer with the new value; and setting a reordering_PDCP_RX_COUNT to a COUNT value associated to RX_HFN and Next_PDCP_RX_SN upon when the PDCP reordering timer with the new value re-start.
Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for releasing a sidelink radio bearer for D2D communication system, the method comprising: receiving configuration information including a targetID, a sourceID, and an LCID from a peer UE, wherein the UE receives data from the peer UE over the sidelink radio bearer; configuring a sidelink radio bearer identified by the targetID, the sourceID, and the LCID; establishing a RLC and a PDCP entities for the sidelink radio bearer based on the configuration information received from the peer UE; starting a timer for the sidelink radio bearer; and releasing the sidelink radio bearer when the timer expires.