Apparatus and method of wireless communication
A wireless communication method for onboarding and provisioning in non-public networks (NPN) is disclosed, wherein a first next-generation radio access network (NG-RAN) transmits NPN-related information to a user equipment (UE). The method introduces mechanisms for NPN cell identification, synchronization sequences, and system information broadcasting, enabling NPN access and provisioning. Improvements include the transmission of synchronization sequences on initial bandwidth parts (BWP), integration of NPN access permissions in system information elements (IEs), and/or enhanced system information delivery on downlink BWPs for NPN access.
1 . A wireless communication method by a first next generation radio access network (NG-RAN) for onboarding and provisioning in non-public network (NPN), comprising:
transmitting, by the first NG-RAN, an NPN cell identification imposed on an access stratum (AS) level to a user equipment (UE), wherein the NPN cell identification imposed on the AS level comprises at least one of the followings:
wherein a synchronization sequence for NPN is transmitted in one or more synchronization signal blocks (SSBs) on an initial bandwidth part (BWP) by an NPN cell;
wherein in a broadcasting system information on a downlink (DL) BWP, an NPN identifier (ID) is present in an NPN access related information, an information element, (IE) and an NPN access permission is present in a cell usage IE;
wherein the DL BWP for NPN is used to transmit an SSB and related system information; or
wherein an access class permission is transmitted in system information on the DL BWP for NPN access allowance.
2 . The method of claim 1 , wherein if the first NG-RAN receives a mobility restriction before a UE handover from an NG-Core, the first NG-RAN configures a measurement configuration based on the NPN cell subscription on the AS level for uplink (UL) to the UE.
3 . The method of claim 1 , further comprising controlling an NPN-capable UE to identify the NPN cell and configure a measurement configuration for an indicated NPN cell list according to an NPN cell identification and measurement configuration.
4 . The method of claim 1 , further comprising controlling an NPN-capable UE to camp either on a stand-alone non-public network (SNPN) cell or a public network integrated NPN (PNI-NPN) cell based on a UE manual cell selection and/or re-selection.
5 . The method of claim 4 , wherein for the UE manual cell selection and/or re-selection, when a best cell according to at least one of a selection priority rule and a re-selection priority rule is an NPN cell which is in a pre-configured NPN cell list and not in an allowed NPN cell list, the NPN-capable UE excludes the best cell as candidate for cell reselection and proceeds to evaluate another cell on the same frequency for cell reselection.
6 . The method of claim 4 , wherein for the UE manual cell selection and/or re-selection, when a best cell according to at least one of a selection priority rule and a re-selection priority rule is an NPN cell which is in an allowed NPN cell list and not in a pre-configured NPN cell list, the NPN-capable UE considers the best cell as candidate for cell reselection.
7 . The method of claim 4 , wherein when the UE is an SNPN-only-capable UE, the SNPN-only-capable UE moves between SNPN cells, and/or when the UE is a PNI-NPN-only-capable UE, the PNI-NPN-only-capable UE moves between closed access group (CAG) cells.
8 . The method of claim 1 , wherein an NPN membership is checked by one or more RAN nodes comprising the first NG-RAN and used by an NG-Core for verification.
9 . The method of claim 1 , wherein a cell selection and/or re-selection is determined by detecting a setting of the NPN access related information IE and/or the cell usage IE to true.
10 . The method of claim 2 , wherein the first NG-RAN controls an NPN-capable UE to report one or more candidate NPN cells and/or a human-readable network name (HRNN), and the first NG-RAN is configured to perform a handover triggering and decision according to the one or more candidate NPN cells and/or the HRNN.
11 . The method of claim 10 , wherein the first NG-RAN is configured to perform an inter-node message exchange, and the inter-node message exchange is performed between the first NG-RAN and a second NG-RAN.
12 . The method of claim 10 , wherein handover preparation information with a mobility restriction of the UE and a handover command with the NPN cell identification on the AS level for DL is transmitted for handover preparation phase.
13 . The method of claim 10 , wherein the first NG-RAN is configured to control the NPN-capable UE in a radio resource control (RRC)_INACTIVE state to transmit an RRC message with a resume ID, an original NPN cell ID, and/or a resume cause.
14 . The method of claim 13 , wherein a connection resumption with the NPN cell subscription on the AS level for UL applies for the NPN-capable UE in the RRC_INACTIVE state.
15 . The method of claim 2 , wherein the first NG-RAN used as a next generation node B (gNB) comprises a centralized unit (CU) and one or more distributed units (DUs), and an F1 interface is defined between the CU and the one or more DUs.
16 . The method of claim 15 , wherein at mobility and connection resumption, a cell reselection for inter-gNB centralized unit (gNB-CU) via a Xn interface and inter-gNB-CU via an NG interface is based on the NPN cell identification on the AS level for DL.
17 . The method of claim 3 , wherein the first NG-RAN is configured to control the NPN-capable UE to camp either on an SNPN cell or a PNI-NPN cell with an RAN functional split based on the NPN cell subscription on the AS level for UL.
18 . The method of claim 17 , wherein after a cell loading check procedure between a target gNB-CU and a target gNB-DU, a handover command is transmitted from the target gNB-CU to the serving gNB-CU.
19 . The method of claim 18 , wherein a CAG list and/or an NID list is transmitted over the F1 interface for the NPN cell subscription on the AS level for UL during the cell loading check procedure, and/or a downlink RRC transfer is used to carry a DL RRC message.
20 . The method of claim 11 , wherein an inter-node message exchange is performed between a master node (MN) and a secondary node (SN) used as a second NG-RAN.
21 . The method of claim 20 , wherein an SN addition request with a mobility restriction of the UE and an SN addition request acknowledge with the NPN cell identification on the AS level for DL is transmitted for SN addition.
22 . The method of claim 20 , wherein upon a reception of the SN addition request acknowledgement, the MN transmits an RRC connection reconfiguration with an NPN cell ID for SN addition.
23 . The method of claim 22 , wherein the MN is configured to control the UE to transmit an RRC connection reconfiguration complete with the NPN cell subscription and/or an SN NPN cell ID to a non-access stratum (NAS) level.
24 . The method of claim 21 , wherein the SN addition with the NPN cell identification on the AS level for DL applies for the NPN-capable UE establishing a new radio (NR) multi-connection in an RRC_CONNECTED state.
25 . The method of claim 21 , wherein the SN addition request with the mobility restriction of the UE is transmitted from the gNB-CU of the MN to a gNB-CU of the SN.
26 . The method of claim 25 , wherein an intra-gNB-CU handover operation with the NPN cell identification on the AS level for DL applies for the NPN-capable UE switching a DU-connection in an RRC_CONNECTED state, and/or an inter-PLMN with a switching of multiple DU-connections in an NPN is based on the NPN cell identification on the AS level for DL.
27 . A first next generation radio access network (NG-RAN), comprising:
a memory;
a transceiver; and
a processor coupled to the memory and the transceiver;
wherein the transceiver is configured to transmit an NPN cell identification imposed on an access stratum (AS) level to a user equipment (UE), wherein the NPN cell identification imposed on the AS level comprises at least one of the followings:
wherein a synchronization sequence for NPN is transmitted in one or more synchronization signal blocks (SSBs) on an initial bandwidth part (BWP) by an NPN cell;
wherein in a broadcasting system information on a downlink (DL) BWP, an NPN identifier (ID) is present in an NPN access related information, an information element, (IE) and an NPN access permission is present in a cell usage IE;
wherein the DL BWP for NPN is used to transmit an SSB and related system information; or
wherein an access class permission is transmitted in system information on the DL BWP for NPN access allowance.
28 . The first NG-RAN of claim 27 , wherein the first NG-RAN used as a next generation node B (gNB) comprises a centralized unit (CU) and one or more distributed units (DUs), and an F1 interface is defined between the CU and the one or more DUs.
29 . The first NG-RAN of claim 28 , wherein at mobility and connection resumption, a cell reselection for inter-gNB centralized unit (gNB-CU) of the first NG-RAN via a Xn interface and inter-gNB-CU of the first NG-RAN via an NG interface is based on the NPN cell identification on the AS level for DL.
30 . The first NG-RAN of claim 28 , wherein after a cell loading check procedure between a target gNB-CU and a target gNB-DU of first NG-RAN, a handover command is transmitted from the target gNB-CU to the serving gNB-CU.
31 . The first NG-RAN of claim 27 , wherein an inter-node message exchange is performed between a master node (MN) used as the first NG-RAN and a secondary node (SN) used as a second NG-RAN.
32 . The first NG-RAN of claim 31 , wherein an SN addition request with a mobility restriction of the UE is transmitted from the gNB-CU of the MN to a gNB-CU of the SN.
33 . The first NG-RAN of claim 32 , wherein an intra-gNB-CU handover operation with the NPN cell identification on the AS level for DL applies for the NPN-capable UE switching a DU-connection in a radio resource control (RRC)_CONNECTED state, and/or an inter-PLMN with a switching of multiple DU-connections in an NPN is based on the NPN cell identification on the AS level for DL.