Method for notifying for D2D communication system and device therefor
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for notifying D2D communication, the method comprising: generating, by a first UE, a first identity (ID) according to a type of D2D (Device to Device) communication; generating, by a first UE, a first indicator indicating that the first UE is trying to perform the type of D2D communication with at least one second UE; and transmitting, by the first UE, a first MAC PDU (Medium Access Control Protocol Data Unit) including the first ID and the first indicator to that at least one second UE.
1. A method for a first user equipment (UE) operating in a wireless communication system, the method comprising:
generating, by the first UE, a Medium Access Control (MAC) Protocol Data Unit (PDU) including a first identity (ID) identifying the first UE and a second ID, and a plurality of logical channel IDs (LCIDs) and a plurality of MAC Service Data Units (SDUs) to be transmitted to a second UE; and
transmitting, by the first UE to the second UE, the generated MAC PDU via a direct interface configured between the first UE and the second UE directly,
wherein if the MAC PDU is for one-to-one communication, the second ID identifies the second UE and the MAC PDU includes an indicator indicating that the MAC PDU is for one-to-one communication,
wherein if the MAC PDU is for one-to-many communication, the second ID identifying a group to which the second UE belongs and the MAC PDU includes an indicator indicating that the MAC PDU is for one-to-many communication, and
wherein each MAC SDU of the plurality of MAC SDUs respectively corresponds to one LCID of the plurality of LCIDs.
2. The method according to claim 1 , wherein the indicator is a joining one-to-one communication indicator indicating that the second UE wants to join device-to-device (D2D) communication with the first UE if the MAC PDU is for one-to-one communication.
3. The method according to claim 1 , wherein the indicator is a joining one-to-many communication indicator indicating that the second UE wants to join device-to-device (D2D) communication with the group identified by the second ID if the MAC PDU is for one-to-many communication.
4. The method according to claim 1 , wherein the MAC PDU further includes a third ID identifying the second UE if the MAC PDU is for one-to-many communication.
5. A first User Equipment (UE) for operating in a wireless communication system, the first UE comprising:
a Radio Frequency (RF) module; and
a processor configured to:
generate a Medium Access Control (MAC) Protocol Data Unit (PDU) including a first identity (ID) identifying the first UE and a second ID, and a plurality of logical channel IDs (LCID) and a plurality of MAC Service Data Units (SDUs) to be transmitted to a second UE, and
control the RF unit to transmit the generated MAC PDU to the second UE via a direct interface configured between the first UE and the second UE directly,
wherein if the MAC PDU is for one-to-one communication, the second ID identifies the second UE and the MAC PDU includes an indicator indicating that the MAC PDU is for one-to-one communication,
wherein if the MAC PDU is for one-to-many communication, the second ID identifying a group to which the second UE belongs and the MAC PDU includes an indicator indicating that the MAC PDU is for one-to-many communication, and
wherein each MAC SDU of the plurality of MAC SDUs respectively corresponds to one LCID of the plurality of LCIDs.
6. The first UE according to claim 5 , wherein the indicator is a joining one-to-one communication indicator indicating that the second UE wants to join device-to-device (D2D) communication with the first UE if the MAC PDU is for one-to-one communication.
7. The first UE according to claim 5 , wherein the indicator is a joining one-to-many communication indicator indicating that the second UE wants to join device-to-device (D2D) communication with the group identified by the second ID if the MAC PDU is for one-to-many communication.
8. The first UE according to claim 5 , wherein the MAC PDU further includes a third ID identifying the second UE if the MAC PDU is for one-to-many communication.