METHOD AND DEVICE FOR WIRELESS COMMUNICATION

1 . A first node for wireless communications, comprising:

a first receiver, receiving a first signaling in radio resource control (RRC)_CONNECTED state, as a response to receiving the first signaling, executing a first operation set, entering into RRC_INACTIVE state; receiving data through a first radio bearer in RRC_INACTIVE state;

wherein the first operation set comprises storing first information in a first inactive context, the first information comprises a first key, and the first key is used to encrypt the first signaling; whether the first information comprises a header compression state for the first radio bearer is related to a type of the first radio bearer; when the first radio bearer is not a multicast radio bearer, the first information comprises a header compression state for the first radio bearer; when the first radio bearer is a multicast radio bearer, the first information does not comprise a header compression state for the first radio bearer.

2 . The first node according to claim 1 , wherein

the first signaling is used to indicate receiving data through the first radio bearer set in RRC_INACTIVE state; the first radio bearer set comprises at least the first radio bearer.

3 . The first node according to claim 1 , wherein

only when data is received through the first radio bearer in RRC_INACTIVE state, the phrase that “when the first radio bearer is a multicast radio bearer, the first information does not comprise a header compression state for the first radio bearer” is valid.

4 . The first node according to claim 2 , wherein

only when data is received through the first radio bearer in RRC_INACTIVE state, the phrase that “when the first radio bearer is a multicast radio bearer, the first information does not comprise a header compression state for the first radio bearer” is valid.

5 . The first node according to claim 1 , wherein

a Packet Data Convergence Protocol (PDCP) entity corresponding to the first radio bearer is configured with header compression, and a profile of the header compression configured to a PDCP entity corresponding to the first radio bearer is a profile other than no compression.

6 . The first node according to claim 3 , wherein

a PDCP entity corresponding to the first radio bearer is configured with header compression, and a profile of the header compression configured to a PDCP entity corresponding to the first radio bearer is a profile other than no compression.

7 . The first node according to claim 4 , wherein

a PDCP entity corresponding to the first radio bearer is configured with header compression, and a profile of the header compression configured to a PDCP entity corresponding to the first radio bearer is a profile other than no compression.

8 . The first node according to claim 1 , comprising:

the first receiver, before receiving the first signaling, receiving data through the first radio bearer in RRC_CONNECTED state.

9 . The first node according to claim 1 , wherein

any radio bearer in the first radio bearer set is a multicast radio bearer for multicast; a second radio bearer is a radio bearer other than the first radio bearer set, and the second radio bearer is a multicast radio bearer for broadcast; the first information does not comprise a header compression state for the first radio bearer.

10 . The first node according to claim 1 , comprising:

the first transmitter, transmitting a first message, and the first message being used to request resuming an RRC connection; accompanying a transmission of the first message, restoring second information from the first inactive context, the second information comprising the first key;

wherein whether the second information comprises a header compression state for the first radio bearer is related to a type of the first radio bearer; when the first radio bearer is not a multicast radio bearer, the second information comprises a header compression state for the first radio bearer; when the first radio bearer is a multicast radio bearer, the second information does not comprise a header compression state for the first radio bearer.

11 . The first node according to claim 3 , comprising:

the first transmitter, transmitting a first message, and the first message being used to request resuming an RRC connection; accompanying a transmission of the first message, restoring second information from the first inactive context, the second information comprising the first key;

wherein whether the second information comprises a header compression state for the first radio bearer is related to a type of the first radio bearer; when the first radio bearer is not a multicast radio bearer, the second information comprises a header compression state for the first radio bearer; when the first radio bearer is a multicast radio bearer, the second information does not comprise a header compression state for the first radio bearer.

12 . The first node according to claim 5 , comprising:

the first transmitter, transmitting a first message, the first message being used to request resuming an RRC connection; accompanying a transmission of the first message, restoring second information from the first inactive context, the second information comprising the first key;

wherein whether the second information comprises a header compression state for the first radio bearer is related to a type of the first radio bearer; when the first radio bearer is not a multicast radio bearer, the second information comprises a header compression state for the first radio bearer; when the first radio bearer is a multicast radio bearer, the second information does not comprise a header compression state for the first radio bearer.

13 . The first node according to claim 6 , comprising:

the first transmitter, transmitting a first message, the first message being used to request resuming an RRC connection; accompanying a transmission of the first message, restoring second information from the first inactive context, the second information comprising the first key;

wherein whether the second information comprises a header compression state for the first radio bearer is related to a type of the first radio bearer; when the first radio bearer is not a multicast radio bearer, the second information comprises a header compression state for the first radio bearer; when the first radio bearer is a multicast radio bearer, the second information does not comprise a header compression state for the first radio bearer.

14 . The first node according to claim 7 , comprising:

the first transmitter, transmitting a first message, the first message being used to request resuming an RRC connection; accompanying a transmission of the first message, restoring second information from the first inactive context, the second information comprising the first key;

wherein whether the second information comprises a header compression state for the first radio bearer is related to a type of the first radio bearer; when the first radio bearer is not a multicast radio bearer, the second information comprises a header compression state for the first radio bearer; when the first radio bearer is a multicast radio bearer, the second information does not comprise a header compression state for the first radio bearer.

15 . The first node according to claim 14 , wherein

the phrase that when the first radio bearer is a multicast radio bearer, the second information does not comprise a header compression state for the first radio bearer is valid only when the first radio bearer is in RRC_INACTIVE state.

16 . The first node according to claim 1 , comprising:

the first receiver, receiving a first indication, the first indication being used to determine stopping receiving data through the first radio bearer; storing a header compression state for the first radio bearer in a first inactive context.

17 . The first node according to claim 1 , wherein

the first signaling indicates a nextHopChainingCount, and the nextHopChainingCount is used to generate key.

18 . The first node according to claim 1 , wherein

the multicast radio bearer is a radio bearer configured for MB S multicast or broadcast transmission, and the first radio bearer is a radio bearer other than signaling radio bearer 0 (SRB0).

19 . The first node according to claim 1 , wherein

a PDCP corresponding to the first radio bearer only has one decompressor instance for header compression.

20 . A method in a first node for wireless communications, comprising:

receiving a first signaling in RRC_CONNECTED state, as a response to receiving the first signaling, executing a first operation set, entering into RRC_INACTIVE state; receiving data through a first radio bearer in RRC_INACTIVE state;

wherein the first operation set comprises storing first information in a first inactive context, the first information comprises a first key, and the first key is used to encrypt the first signaling; whether the first information comprises a header compression state for the first radio bearer is related to a type of the first radio bearer; when the first radio bearer is not a multicast radio bearer, the first information comprises a header compression state for the first radio bearer; when the first radio bearer is a multicast radio bearer, the first information does not comprise a header compression state for the first radio bearer.