Notification method and apparatus for returning to network, and terminal
This application discloses a notification method and apparatus for returning to a network, and a terminal. The notification method is performed by a terminal, including: determining whether to send a return notification to a network; and when it is determined to send the return notification to the network, sending the return notification to the network.
1 . A notification method for returning to a network, performed by a terminal, comprising:
when the terminal returns to the network before a gap ends, determining, by a media access control (MAC) layer of the terminal, whether to send a return notification to the network; and
when it is determined to send the return notification to the network, sending the return notification to the network,
wherein sending the return notification to the network comprises:
initiating random access,
wherein the gap is a Multi-SIM gap, and the terminal is a multi-SIM terminal.
2 . The notification method according to claim 1 , wherein determining whether to send the return notification to the network comprises:
determining to send the return notification to the network when a preset condition is met, wherein the preset condition comprises at least one of the following:
a first preset condition: when the terminal returns to the network, there is no uplink data or signaling to be sent;
a second preset condition: when the terminal returns to the network, no buffer status report (BSR) is triggered;
a third preset condition: when the terminal returns to the network, the buffer status report (BSR) is triggered, but there is no resource for sending the BSR;
a fourth preset condition: when the terminal returns to the network, there is uplink data to be sent, but the uplink data has triggered the BSR, and there is no resource for sending the uplink data;
a fifth preset condition: the network configures the terminal to send the return notification;
a sixth preset condition: before returning to the network, the terminal leaves the network based on first indication information of the network; or
a seventh preset condition: the terminal leaves the network autonomously.
3 . The notification method according to claim 2 , wherein the first preset condition is determined based on at least one of the following:
an indication of the MAC layer of the terminal, an indication of an RRC layer of the terminal, an indication of a service data adaptation protocol (SDAP) layer of the terminal, an indication of a PDCP layer of the terminal, or an indication of a physical layer of the terminal.
4 . The notification method for returning to a network according to claim 1 , wherein when it is determined to send the return notification to the network, sending the return notification to the network further comprises at least one of the following:
generating or triggering a BSR;
generating a MAC control element (CE), wherein the MAC CE is used to instruct the terminal to return to the network;
triggering a scheduling request (SR);
requesting, by the MAC layer of the terminal, an RRC layer to generate the return notification;
requesting, by the RRC layer of the terminal, the MAC layer to generate the return notification;
generating, by the RRC layer, the return notification;
sending, by the MAC layer of the terminal, the return notification generated at the RRC layer; or
triggering channel state information (CSI) reporting or sounding reference signal (SRS) sending.
5 . The notification method according to claim 4 , wherein the MAC CE comprises a specific logical channel identifier (LCID) field or a specific numerical field.
6 . The notification method according to claim 4 , wherein the BSR meets any one of the following:
a buffer size field does not appear;
a value of the buffer size field is a preset value;
a value of an LCID field is a preset value; or
the BSR is empty.
7 . The notification method according to claim 4 , wherein when the terminal has a dedicated SR resource, the SR is sent.
8 . The notification method according to claim 4 , wherein when the terminal has a physical uplink shared channel (PUSCH) resource, performing any one of the following:
sending the BSR;
sending the MAC CE;
generating, by the RRC layer, the return notification;
requesting, by the MAC layer of the terminal, the RRC layer to generate the return notification;
requesting, by the RRC layer of the terminal, the MAC layer to generate the return notification; or
sending, by the MAC layer of the terminal, the return notification generated at the RRC layer.
9 . The notification method according to claim 4 , wherein when the terminal has a dedicated resource for CSI or SRS reporting, CSI reporting or SRS sending is triggered.
10 . The notification method according to claim 1 , wherein when the terminal has no available PUSCH resource or physical uplink control channel (PUCCH) resource, random access is initiated.
11 . The notification method according to claim 1 , wherein before determining whether to send the return notification to the network, the method further comprises at least one of the following:
requesting or indicating, by an RRC layer of the terminal, to restore a packet data convergence protocol (PDCP) layer of the terminal; or
requesting, by the RRC layer of the terminal, the PDCP layer of the terminal to indicate whether there is uplink data to be sent.
12 . The notification method according to claim 1 , wherein before it is determined to send the return notification to the network, the method further comprises:
obtaining a configuration of a first resource of the network, so as to use the first resource to send the return notification to the network.
13 . The notification method according to claim 12 , wherein the first resource comprises at least one of the following:
a configured grant type 1;
a configured grant type 2;
a physical uplink shared channel (PUSCH) resource;
a physical uplink control channel (PUCCH) resource;
a dedicated scheduling request (SR) resource;
a dedicated random access channel (RACH) resource;
a dedicated sounding reference signal (SRS) resource; or
a dedicated channel state information (CSI) reporting resource.
14 . The notification method for returning to a network according to claim 1 , wherein the gap is a period of time in which the terminal does not monitor scheduling or does not transmit data in the network.
15 . A terminal, comprising:
a memory storing a computer program; and
a processor coupled to the memory and configured to execute the computer program to perform operations comprising:
when the terminal returns to the network before a gap ends determining, by a media access control (MAC) layer of the terminal, whether to send a return notification to a network; and
when it is determined to send the return notification to the network, sending the return notification to the network,
wherein sending the return notification to the network comprises:
initiating random access,
wherein the gap is a Multi-SIM gap, and the terminal is a multi-SIM terminal.
16 . The terminal according to claim 15 , wherein determining whether to send the return notification to the network comprises:
determining to send the return notification to the network when a preset condition is met, wherein the preset condition comprises at least one of the following:
a first preset condition: when the terminal returns to the network, there is no uplink data or signaling to be sent;
a second preset condition: when the terminal returns to the network, no buffer status report (BSR) is triggered;
a third preset condition: when the terminal returns to the network, the buffer status report (BSR) is triggered, but there is no resource for sending the BSR;
a fourth preset condition: when the terminal returns to the network, there is uplink data to be sent, but the uplink data has triggered the BSR, and there is no resource for sending the uplink data;
a fifth preset condition: the network configures the terminal to send the return notification;
a sixth preset condition: before returning to the network, the terminal leaves the network based on first indication information of the network; or
a seventh preset condition: the terminal leaves the network autonomously.
17 . The terminal according to claim 15 , wherein when it is determined to send the return notification to the network, sending the return notification to the network further comprises at least one of the following:
generating or triggering a BSR;
generating a MAC control element (CE), wherein the MAC CE is used to instruct the terminal to return to the network;
triggering a scheduling request (SR);
requesting, by the MAC layer of the terminal, an RRC layer to generate the return notification;
requesting, by the RRC layer of the terminal, the MAC layer to generate the return notification;
generating, by the RRC layer, the return notification;
sending, by the MAC layer of the terminal, the return notification generated at the RRC layer; or
triggering channel state information (CSI) reporting or sounding reference signal (SRS) sending.
18 . The terminal according to claim 15 , wherein the gap is a period of time in which the terminal does not monitor scheduling or does not transmit data in the network.
19 . A non-transitory computer-readable storage medium, storing a computer program, when the computer program is executed by a processor of a terminal, causes the processor to perform operations comprising:
when the terminal returns to the network before a gap ends, determining, by a media access control (MAC) layer of the terminal, whether to send a return notification to a network; and
when it is determined to send the return notification to the network, sending the return notification to the network,
wherein sending the return notification to the network comprises:
initiating random access,
wherein the gap is a Multi-SIM gap, and the terminal is a multi-SIM terminal.
20 . The non-transitory computer-readable storage medium according to claim 19 , wherein the gap is a period of time in which the terminal does not monitor scheduling or does not transmit data in the network.