Transmission during a radio access network (RAN) update
The present application discloses a method and a device in a communication node for wireless communications. A communication node receives a first message; and as a response to the action of receiving a first message, starts a first timer; and determines whether to transmit a second message at a first time according to whether a packet is to be transmitted via a first data radio bearer; the first message is an RRC signaling, where a name of the first message includes RRC and Release, the first message indicating a first expiration value of the first timer; a time interval from the first time to the starting action of the first timer is no smaller than the first expiration value of the first timer. The present application proposes a scheme of canceling the performance of RNA update in Small Data transmission for guaranteeing the transmission of small data packets.
1 . A first node for wireless communications, comprising:
a receiver, configured to receive a first message comprising an indication of a first expiration value associated with a first timer, wherein the first message is a radio resource control (RRC) release message;
in response to the received first message, run the first timer until an expiry of the first timer according to the first expiration value; and
a first transmitter configured to transmit a second message used to determine an update of a first area, wherein the transmission of the second message is triggered after the expiry of the first timer and in response to a received system information block (SIB) message if there is an ongoing small data transmission (SDT), and wherein the transmission of the second message is triggered by the expiry of the first timer if there is no ongoing SDT.
2 . A method in a first node for wireless communications, comprising:
receiving a first message comprising an indication of a first expiration value associated with a first timer, wherein the first message is a radio resource control (RRC) release message;
in response to the received first message, running the first timer until an expiry of the first timer according to the first expiration value; and
transmitting a second message used to determine an update of a first area, wherein the transmission of the second message is triggered after the expiry of the first timer and in response to a received system information block (SIB) message if there is an ongoing small data transmission (SDT), and wherein the transmission of the second message is triggered by the expiry of the first timer if there is no ongoing SDT.
3 . The first node of claim 1 , further configured to:
in response to the received first message, enter an RRC_INACTIVE state.
4 . The first node of claim 1 , wherein the indication of the first expiration value is included in a T380 field of the first message.
5 . The first node of claim 1 , wherein the first timer is a T380 timer.
6 . The first node of claim 1 , wherein the ongoing SDT is via a first data radio bearer.
7 . The first node of claim 1 , wherein the transmission of the second message is triggered by the expiry of the first timer if an SDT at the first node fails before the expiry of the first timer.
8 . The first node of claim 1 , wherein the transmission of the second message is triggered after the expiry of the first timer and in response to the received SIB message if a serving cell of the first node does not belong to a configured ran-NotificationAreaInfo.
9 . The first node of claim 1 , wherein the second message is an RRC resume request message including a resumeCause indication with a value configured as rna-Update, and wherein the first area comprises a radio access network (RAN)-based Notification Area (RNA).
10 . The method of claim 2 , further comprising:
in response to the received first message, entering an RRC_INACTIVE state.
11 . The method of claim 2 , wherein the indication of the first expiration value is included in a t380 field of the first message.
12 . The method of claim 2 , wherein the first timer is a T380 timer.
13 . The method of claim 2 , wherein the ongoing SDT is via a first data radio bearer.
14 . The method of claim 2 , wherein the transmission of the second message is triggered by the expiry of the first timer if an SDT at the first node fails before the expiry of the first timer.
15 . The method of claim 2 , wherein the transmission of the second message is triggered after the expiry of the first timer and in response to the received SIB message if a serving cell of the first node does not belong to configured a ran-NotificationAreaInfo.
16 . The method of claim 2 , wherein the second message is an RRC resume request including a resumeCause indication with a value configured as rna-Update, and wherein the first area comprises a radio access network (RAN)-based Notification Area (RNA).