METHOD AND DEVICE USED FOR WIRELESS COMMUNICATION
The present application provides a method and device for wireless communications. A first node, as a response to any condition in a first condition set being satisfied, transitions from RRC_INACTIVE state to a first RRC state; when the first node receives data from a multicast MRB in the RRC_INACTIVE state, receives at least one first-type signal, and each of the at least one first-type signal comprises the data from the multicast MRB; wherein the first condition set is related to whether the first node receives the data from the multicast MRB in the RRC_INACTIVE state; there exists at least one first-type condition belonging to the first condition set only when the first node receives the data from the multicast MRB in the RRC_INACTIVE state. The present application can significantly reduce packet loss.
1 . A first node for wireless communications, comprising:
a first transmitter, as a response to any condition in a first condition set being satisfied, transitioning from RRC (Radio Resource Control)_INACTIVE state to a first RRC state, the first RRC state being RRC_CONNECTED state; and
a first receiver, when the first node receives data from a multicast MRB (MBS Radio Bearer) in the RRC_INACTIVE state, receiving at least one first-type signal, and each of the at least one first-type signal comprising the data from the multicast MRB;
wherein the first condition set is related to whether the first node receives the data from the multicast MRB in the RRC_INACTIVE state; there exists at least one first-type condition belonging to the first condition set only when the first node receives the data from the multicast MRB in the RRC_INACTIVE state; each of the at least one first-type signal is associated with an SSB (SS/PBCH) indicated by a first SSB index.
2 . The first node according to claim 1 , wherein one of the at least one first-type condition is that reception quality of the SSB indicated by the first SSB index is less than a first threshold;
wherein the first threshold is explicitly indicated by a higher-layer signaling.
3 . The first node according to claim 1 , wherein one of the at least one first-type condition is that measured RSRP (Reference Signal Received Power) or RSRQ (Reference Signal Received Quality) of a first cell is less than a third threshold;
wherein the third threshold is configurable, and the first cell is a serving cell.
4 . The first node according to claim 1 , wherein the transitioning to a first RRC state comprises transmitting a second message, and the second message requests resuming an RRC connection;
wherein a first RLC (Radio Link Control) bearer associated with the multicast MRB is configured for small data transmission; the second message comprises an RLC control message, and the RLC control message is transmitted through the first RLC bearer.
5 . The first node according to claim 1 , wherein when the first node does not receive the data from the multicast MRB in the RRC_INACTIVE state, the first condition set is a first candidate condition set; when the first node receives the data from the multicast MRB in the RRC_INACTIVE state, the first condition set is a second candidate condition set; the first candidate condition set is a true subset of the second candidate condition set.
6 . The first node according to claim 1 , wherein the multicast MRB is associated with a second RLC bearer, and the second RLC bearer is transmitted through PTM (Point to Multipoint);
wherein the multicast MRB is a radio bearer configured for MBS (multicast/broadcast service) multicast transmission.
7 . The first node according to claim 1 , wherein the first SSB index is one of N SSB index(es), N being a positive integer.
8 . A second node for wireless communications, comprising:
a second transmitter, transmitting at least one first-type signal, each of the at least one first-type signal comprising data from a multicast MRB;
wherein as a response to any condition in a first condition set being satisfied, a first node transitions from RRC_INACTIVE state to a first RRC state, the first RRC state is RRC_CONNECTED state; the first condition set is related to whether the first node receives the data from the multicast MRB in the RRC_INACTIVE state; there exists at least one first-type condition belonging to the first condition set only when the first node receives the data from the multicast MRB in the RRC_INACTIVE state; each of the at least one first-type signal is associated with an SSB indicated by a first SSB index.
9 . The second node according to claim 8 , wherein one of the at least one first-type condition is that reception quality of the SSB indicated by the first SSB index is less than a first threshold;
wherein the first threshold is explicitly indicated by a higher-layer signaling.
10 . The second node according to claim 8 , wherein one of the at least one first-type condition is that measured RSRP or RSRQ of a first cell is less than a third threshold;
wherein the third threshold is configurable, and the first cell is a serving cell.
11 . The second node according to claim 8 , comprising:
a second receiver, receiving a second message, the second message being used to request resuming an RRC connection;
wherein the first node transitions from RRC_INACTIVE state to a first RRC state comprises transmitting the second message; a first RLC bearer associated with the multicast MRB is configured for small data transmission; the second message comprises an RLC control message, and the RLC control message is transmitted through the first RLC bearer.
12 . The second node according to claim 8 , wherein when the first node does not receive the data from the multicast MRB in the RRC_INACTIVE state, the first condition set is a first candidate condition set; when the first node receives the data from the multicast MRB in the RRC_INACTIVE state, the first condition set is a second candidate condition set; the first candidate condition set is a true subset of the second candidate condition set.
13 . The second node according to claim 8 , wherein the first SSB index is one of N SSB index(es), N being a positive integer.
14 . A method in a first node for wireless communications, comprising:
as a response to any condition in a first condition set being satisfied, transitioning from RRC_INACTIVE state to a first RRC state, the first RRC state being RRC_CONNECTED state; and
when the first node receives data from a multicast MRB in the RRC_INACTIVE state, receiving at least one first-type signal, and each of the at least one first-type signal comprising the data from the multicast MRB;
wherein the first condition set is related to whether the first node receives the data from the multicast MRB in the RRC_INACTIVE state; there exists at least one first-type condition belonging to the first condition set only when the first node receives the data from the multicast MRB in the RRC_INACTIVE state; each of the at least one first-type signal is associated with an SSB indicated by a first SSB index.
15 . The method in a first node according to claim 14 , wherein one of the at least one first-type condition is that reception quality of an SSB indicated by the first SSB index is less than a first threshold;
wherein the first threshold is explicitly indicated by a higher-layer signaling.
16 . The method in a first node according to claim 14 , wherein one of the at least one first-type condition is that measured RSRP or RSRQ of a first cell is less than a third threshold;
wherein the third threshold is configurable, and the first cell is a serving cell.
17 . The method in a first node according to claim 14 , comprising:
the transitioning to a first RRC state comprises transmitting a second message, the second message being used to request resuming an RRC connection;
wherein the first RLC bearer associated with the multicast MRB is configured for small data transmission; the second message comprises an RLC control message, and the RLC control message is transmitted through the first RLC bearer.
18 . The method in a first node according to claim 14 , wherein when the first node does not receive the data from the multicast MRB in the RRC_INACTIVE state, the first condition set is a first candidate condition set; when the first node receives the data from the multicast MRB in the RRC_INACTIVE state, the first condition set is a second candidate condition set; the first candidate condition set is a true subset of the second candidate condition set.
19 . The method in a first node according to claim 14 , wherein the multicast MRB is associated with a second RLC bearer, and the second RLC bearer is transmitted through PTM;
wherein the multicast MRB is a radio bearer configured for MBS (multicast/broadcast service) multicast transmission.
20 . The method in a first node according to claim 14 , wherein the first SSB index is one of N SSB index(es), N being a positive integer.