METHOD AND DEVICE FOR WIRELESS COMMUNICATION
Discloser a method and a device for wireless communications, including: transmitting a first MAC PDU, the first MAC PDU comprising a first MAC header and a first MAC subPDU, the first MAC subPDU comprising a first MAC sub-header and a first MAC SDU, the first MAC SDU comprising a first PDCP PDU; the first PDCP PDU being a PDCP PDU of a sidelink RB; herein, a target parameter is used for security algorithm of the first PDCP PDU; whether the target parameter is a LCID is related to whether the first node is a generator of the first PDCP PDU; when the first node is the generator of the first PDCP PDU, the target parameter is a LCID; when the first node is not the generator of the first PDCP PDU, the target parameter is not a LCID. The present application can better ensure security using a target parameter.
1 . A first node for wireless communications, comprising:
a first transmitter, transmitting a first Medium Access Control (MAC) Protocol Data Unit (PDU), the first MAC PDU comprising a first MAC header and a first MAC subPDU, the first MAC subPDU comprising a first MAC sub-header and a first MAC Service Data Unit (SDU), the first MAC SDU comprising a first Packet Data Convergence Protocol (PDCP) PDU; the first PDCP PDU being a PDCP PDU of a unicast sidelink radio bearer (RB);
wherein a target parameter is used for security algorithm of the first PDCP PDU; whether the target parameter is a logical channel identity (LCID) is related to whether the first node is a generator of the first PDCP PDU; when the first node is the generator of the first PDCP PDU, the target parameter is a LCID; when the first node is not the generator of the first PDCP PDU, the target parameter is not a LCID; a header of the first PDCP PDU indicates an identity of a first key, the first key being used for the security algorithm of the first PDCP PDU.
2 . The first node according to claim 1 , characterized in comprising:
a first receiver, receiving a second MAC PDU before the action of transmitting a first MAC PDU, the second MAC PDU for generating the first MAC PDU;
wherein the second MAC PDU comprises a second MAC header and a second MAC subPDU, the second MAC subPDU comprising a second MAC subheader and a second MAC SDU, the second MAC SDU comprising the first PDCP PDU; the generator of the first PDCP PDU is a node other than the first node.
3 . The first node according to claim 2 , characterized in that
the second MAC header comprises a first field and a second field, where the first field in the second MAC header indicates the generator of the first PDCP PDU, while the second field in the second MAC header indicates the first node; the first MAC header comprises a first field and a second field, where the first field comprised by the first MAC header indicates the first node, while the second field comprised by the first MAC header indicates a receiver of the first MAC PDU.
4 . The first node according to claim 1 , characterized in that
the first MAC SDU comprises a PDU of a first protocol layer, the first protocol layer being a protocol layer between an RLC layer and a PDCP layer, with a header of the PDU of the first protocol layer comprising the target parameter;
wherein the generator of the first PDCP PDU is a node other than the first node.
5 . The first node according to claim 2 , characterized in that
the first MAC SDU comprises a PDU of a first protocol layer, the first protocol layer being a protocol layer between an RLC layer and a PDCP layer, with a header of the PDU of the first protocol layer comprising the target parameter;
wherein the generator of the first PDCP PDU is a node other than the first node.
6 . The first node according to claim 3 , characterized in that
the first MAC SDU comprises a PDU of a first protocol layer, the first protocol layer being a protocol layer between an RLC layer and a PDCP layer, with a header of the PDU of the first protocol layer comprising the target parameter;
wherein the generator of the first PDCP PDU is a node other than the first node.
7 . The first node according to claim 1 , characterized in that
the target parameter is a peer-to-peer identity or identifier;
wherein the first node is not a generator of the first PDCP PDU.
8 . The first node according to claim 4 , characterized in that
the target parameter is a BEARER ID.
9 . The first node according to claim 5 , characterized in that
the target parameter is a BEARER ID.
10 . The first node according to claim 6 , characterized in that
the target parameter is a BEARER ID.
11 . The first node according to claim 4 , characterized in that
the target parameter is an identity of a radio bearer between the generator of the first PDCP PDU and a receiver of the first MAC PDU.
12 . The first node according to claim 5 , characterized in that
the target parameter is an identity of a radio bearer between the generator of the first PDCP PDU and a receiver of the first MAC PDU.
13 . The first node according to claim 6 , characterized in that
the target parameter is an identity of a radio bearer between the generator of the first PDCP PDU and a receiver of the first MAC PDU.
14 . The first node according to claim 8 , characterized in that
5 bits of the target parameter are as inputs of parameters of the security algorithm from BEARER[0] to BEARER[4].
15 . The first node according to claim 11 , characterized in that
5 bits of the target parameter are as inputs of parameters of the security algorithm from BEARER[0] to BEARER[4].
16 . The first node according to claim 1 , characterized in that
when the first node is not the generator of the first PDCP PDU, the first node is a L2 U2U (i.e., UE to UE) relay node.
17 . The first node according to claim 8 , characterized in that
when the first node is not the generator of the first PDCP PDU, the first node is a L2 U2U relay node.
18 . The first node according to claim 11 , characterized in that
when the first node is not the generator of the first PDCP PDU, the first node is a L2 U2U relay node.
19 . The first node according to claim 1 , characterized in that
when the first node is the generator of the first PDCP PDU, the first node is not a L2 U2U relay node; the first node is a remote UE.
20 . A method in a first node for wireless communications, comprising:
transmitting a first MAC PDU, the first MAC PDU comprising a first MAC header and a first MAC subPDU, the first MAC subPDU comprising a first MAC sub-header and a first MAC SDU, the first MAC SDU comprising a first PDCP PDU; the first PDCP PDU being a PDCP PDU of a unicast sidelink RB;
wherein a target parameter is used for security algorithm of the first PDCP PDU; whether the target parameter is a LCID is related to whether the first node is a generator of the first PDCP PDU; when the first node is the generator of the first PDCP PDU, the target parameter is a LCID; when the first node is not the generator of the first PDCP PDU, the target parameter is not a LCID; a header of the first PDCP PDU indicates an identity of a first key, the first key being used for the security algorithm of the first PDCP PDU.