Method for transmitting or receiving a MAC PDU in a wireless communication system and a device therefor
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for transmitting or receiving a MAC PDU in a wireless communication system, the method comprising: setting a LCID field in a MAC subheader to a first value indicating that an eLCID field is included in the MAC subheader when a MAC PDU including the LCID field and the eLCID field is to be generated, setting the eLCID field to a second value identifying a logical channel of a MAC SDU or a type of a MAC CE, and generating and transmitting the MAC PDU including the LCID field and the eLCID field, and the MAC SDU or the MAC CE.
1. A method for a device operating in a wireless communication system, the method comprising:
generating a Medium Access Control (MAC) protocol data unit (PDU) including a MAC PDU subheader, the MAC PDU subheader including a first octet of 8 bits; and
transmitting the generated MAC PDU to a second device,
wherein the first octet includes a logical channel identity (LCID) field, and a specific value of the LCID field informs of that a second octet of 8 bits following the first octet is presented for an extended LCID (eLCID) field in the MAC PDU subheader,
wherein a length (L) field related to a length of a MAC control element (CE) is included in a third octet of 8 bits in the MAC PDU subheader, and the second octet is followed by the third octet,
wherein the first octet includes the LCID field and a reserved bit, and the second octet includes only the eLCID field, and the third octet includes only the L field,
wherein there is no octet between the first octet and the second octet, and
wherein the eLCID field identifies a type of the MAC CE.
2. The method according to claim 1 ,
wherein the specific value is one of reserved values of the LCID field.
3. The method of claim 1 , wherein the device is configured by the second device to generate the MAC PDU.
4. A device operating in a wireless communication system, the device comprising:
a transceiver; and
a processor operatively connected to the transceiver, the processor configured for:
generating a Medium Access Control (MAC) protocol data unit (PDU) including a MAC PDU subheader, the MAC PDU subheader including a first octet of 8 bits; and
transmitting the generated MAC PDU to a second device,
wherein the first octet includes a logical channel identity (LCID) field, and a specific value of the LCID field informs of that a second octet of 8 bits following the first octet is presented for an extended LCID (eLCID) field in the MAC PDU subheader,
wherein a length (L) field related to a length of a MAC control element (CE) is included in a third octet of 8 bits in the MAC PDU subheader, and the second octet is followed by the third octet,
wherein the first octet includes the LCID field and a reserved bit, and the second octet includes only the eLCID field, and the third octet includes only the L field,
wherein there is no octet between the first octet and the second octet, and
wherein the eLCID field identifies a type of the MAC CE.
5. The device of claim 4 ,
wherein the specific value is one of reserved values of the LCID field.
6. The device of claim 4 , wherein the device is configured by the second device to generate the MAC PDU.
7. A method for a device operating in a wireless communication system, the method comprising:
receiving, from a second device, a Medium Access Control (MAC) protocol data unit (PDU) including a MAC PDU subheader, the MAC PDU subheader including a first octet of 8 bits,
decoding the MAC PDU,
wherein the first octet includes a logical channel identity (LCID) field, and a specific value of the LCID field informs of that a second octet of 8 bits following the first octet is presented for an extended LCID (eLCID) field in the MAC PDU subheader,
wherein a length (L) field related to a length of a MAC control element (CE) is included in a third octet of 8 bits in the MAC PDU subheader, and the second octet is followed by the third octet,
wherein the first octet includes the LCID field and a reserved bit, and the second octet includes only the eLCID field, and the third octet includes only the L field,
wherein there is no octet between the first octet and the second octet, and
wherein the eLCID field identifies a type of the MAC CE.
8. The method according to claim 7 ,
wherein the specific value is one of reserved values of the LCID field.
9. A device operating in a wireless communication system, the device comprising:
a transceiver; and
a processor operatively connected to the transceiver, the processor configured for:
receiving, from a second device, a Medium Access Control (MAC) protocol data unit (PDU) including a MAC PDU subheader, the MAC PDU subheader including a first octet of 8 bits,
decoding the MAC PDU,
wherein the first octet includes a logical channel identity (LCID) field, and a specific value of the LCID field informs of that a second octet of 8 bits following the first octet is presented for an extended LCID (eLCID) field in the MAC PDU subheader,
wherein a length (L) field related to a length of a MAC control element (CE) is included in a third octet of 8 bits in the MAC PDU subheader, and the second octet is followed by the third octet,
wherein the first octet includes the LCID field and a reserved bit, and the second octet includes only the eLCID field, and the third octet includes only the L field,
wherein there is no octet between the first octet and the second octet, and
wherein the eLCID field identifies a type of the MAC CE.
10. The device of claim 9 ,
wherein the specific value is one of reserved values of the LCID field.