Communication method and system, base station and terminal

Patent metadata

Field	Value
Publication number	US-12250736-B2
Application number	US-202017772804-A
Country	US
Kind code	B2
Filing date	Jul 13, 2020
Priority date	Oct 30, 2019
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

The present disclosure relates to a communication method, system, base station, and terminal. The method includes: sending, by a first BS, a broadcast message, which comprises: a NID and a PLMN ID, which correspond to each of one or more SNPNs supported by the first BS; receiving, by the first BS, a connection request sent from a terminal, wherein the connection request represents that the first BS supports at least one of one or more SNPNs subscribed by the terminal; establishing, by the first BS, a RRC connection with the terminal; receiving, by the first BS, a RRC connection setup complete message sent from the terminal, wherein the RRC connection setup complete message carries a NID and a PLMN ID, which correspond to a SNPN that the terminal selects to access; and connecting, by the first BS, the terminal to the SNPN that the terminal selects to access.

First claim

What is claimed is:

1. A communication method, comprising:
sending, by a first Base Station (BS), a broadcast message, which comprises: a Network Identifier (NID) and a Public Land Mobile Network Identifier (PLMN ID), which correspond to each of one or more Standalone Non-Public Networks (SNPNs) supported by the first BS;
receiving, by the first BS, a connection request sent from a terminal, wherein the connection request represents that the first BS supports at least one of one or more SNPNs subscribed by the terminal;
establishing, by the first BS, a Radio Resource Control (RRC) connection with the terminal according to the connection request;
receiving, by the first BS, a RRC connection setup complete message sent from the terminal, wherein the RRC connection setup complete message carries a NID and a PLMN ID, which correspond to a SNPN that the terminal selects to access; and
connecting, by the first BS, the terminal to the SNPN that the terminal selects to access, according to the RRC connection setup complete message;
receiving, by the first BS, a measurement report sent from the terminal, wherein the measurement report comprises: a NID, a PLMN ID and signal quality information of a cell, which correspond to a SNPN that the terminal applies to access;
making a handover judgment and determining a cell corresponding to a second BS as a target cell according to the measurement report by the first BS;
sending, by the first BS, a handover required message to a core network element, to initiate a handover request to the second BS through the core network element, wherein the handover required message comprises the NID and the PLMN ID, which correspond the SNPN that the terminal applies to access, and an identifier of the target cell, in a case where the first BS judges that a handover condition is met; and
receiving, by the first BS, a handover command returned by the core network element, and executing a handover process, wherein the handover command represents that the target cell supports the SNPN that the terminal applies to access.

2. The communication method according to claim 1 , wherein connecting, by the first BS, the terminal to the SNPN that the terminal selects to access comprises:
sending, by the first BS, an initial user equipment (UE) message to a core network element, wherein the initial UE message comprises the NID and the PLMN ID, which correspond to the SNPN that the terminal selects to access, which are used for verifying whether a current access of the terminal is legal; and
receiving, by the first BS, a downlink non-access stratum transport message sent from the core network element, and connecting the terminal to the SNPN that the terminal selects to access according to the downlink non-access stratum transport message, wherein the downlink non-access stratum transport message represents that the current access of the terminal is legal.

3. The communication method according to claim 2 , wherein:
the NID corresponding to the SNPN that the terminal selects to access is added to a mobility restriction list of the downlink non-access stratum transport message as a serving NID; or
whether the current access of the terminal is legal is determined according to a comparison result between the NID and the PLMN ID, which correspond the SNPN that the terminal selects to access and NIDs and PLMN IDs, which correspond to the one or more SNPNs subscribed by the terminal.

4. The communication method according to claim 1 , wherein sending, by the first BS, the handover required message to the core network element, to initiate the handover request to the second BS through the core network element comprises:
matching, by the first BS, the NID and the PLMN ID, which correspond the SNPN that the terminal applies to access with a NID and a PLMN ID, which correspond to a SNPN to which the terminal is connected under the first BS;
if matched, comparing, by the first BS, the NID and the PLMN ID, which correspond to the SNPN to which the terminal is connected under the first BS with a NID and a PLMN ID, which correspond to each core network element, and determining a core network element with a same NID and a same PLMN ID as the NID and the PLMN ID, which correspond to the SNPN to which the terminal is connected under the first BS, and sending the handover required message to the core network element;
optionally, the method further comprising: receiving, by the first BS, a configuration update signaling or a Next Generation (NG) setup response message of each core network element, wherein the configuration update signaling comprises information of an updated NID corresponding to the each core network element, or the NG setup response message comprises a NID corresponding to the each core network element.

5. The communication method according to claim 1 , further comprising: after the first BS sends the handover required message to the core network element,
determining, by the core network element, whether a current handover of the terminal is legal according to a comparison result between the NID and the PLMN ID, which correspond to the SNPN that the terminal applies to access and NIDs and PLMN IDs, which correspond to one or more SNPNs subscribed by the terminal; and
sending, by the core network element, the handover request to the second BS, in a case where the current handover of the terminal is legal.

6. The communication method according to claim 5 , wherein sending, by the core network element, the handover request to the second BS comprises:
matching the NIDs and the PLMN IDs, which correspond to the one or more SNPNs subscribed by the terminal with NIDs and PLMN IDs, which correspond to one or more SNPNs supported by the second BS, and sending the handover request to the second BS by the core network element, in a case where the match is successful; or
matching the NID and the PLMN ID, which correspond to the SNPN that the terminal applies to access with a NID and a PLMN ID, which correspond to a SNPN supported by the target cell, and sending the handover request to the second BS by the core network element, in a case where the match is successful;
optionally, wherein the second BS sends the NIDs corresponding to the one or more SNPNs supported by the second BS to the core network element through a Next Generation (NG) setup request or a Radio Access Network (RAN) configuration update message.

7. The communication method according to claim 1 , wherein the handover request comprises a mobility restriction list, which comprises the NID and the PLMN ID, which correspond to the SNPN that the terminal applies to access, and the method further comprises:
determining, by the second BS, whether to allow a handover of the terminal according to a comparison result between the NID and the PLMN ID, which correspond to the SNPN that the terminal applies to access, and NIDs and PLMN IDs, which correspond to one or more SNPNs supported by the second BS, or a comparison result between the NID and the PLMN ID, which correspond to the SNPN that the terminal applies to access and a NID and a PLMN ID, which correspond to a SNPN supported by the target cell;
sending, by the second BS, a handover request acknowledge message to the core network element, in a case of allowing the handover of the terminal; and
sending, by the core network element, a handover command to the first BS according to the handover request acknowledge message.

8. A communication method, comprising:
receiving, by a terminal, a broadcast message sent from a first Base Station (BS), wherein the broadcast message comprising: a Network Identifier (NID) and a Public Land Mobile Network Identifier (PLMN ID), which correspond to each of one or more Standalone Non-Public Networks (SNPNs)

Assignees

• China Telecom Co Ltd

Inventors

• Liu Shengnan
• Jiang Zheng
• Chen Peng
• She Xiaoming

Classifications

• H04W36/00838

  Resource reservation for handover · CPC title

• H04W36/14

  Reselecting a network or an air interface · CPC title

• H04W36/0061

  of neighbour cell information · CPC title

• H04W36/0058

  Transmission of hand-off measurement information, e.g. measurement reports · CPC title

• H04W8/186

  Processing of subscriber group data · CPC title