Mediatek Corporation

Mediatek Singapore Pte. Ltd.

Yuan-Chieh Lin

Chien-Chun Huang-Fu

Yu-Syuan Conan Jheng

Guillaume Sebire

Shang-Ru Mo

Chia-Lin Lai

Kuan-Ming Lin

Yung-Fu Chen

Ming-Cong Sun

Nathan Edward Tenny

Yu-Hsin Lin

Marko Niemi

Hung-Lin Chang

Yung Hsiang Hsieh

Huang-Yi Yu

Tsung-Chieh Chang

Chi-Hsien Chen

Ming-Yuan Cheng

Po-Ying Chuang

Mohamed Abdelrazek El-Saidny

Po-Chun Lee

Hui-Ling Chang

Pan-Yen Chiang

Yi-Lun Chen

Yung-Chun Yang

Jen-Chieh Huang

Chien-Chun Huang-fu

A method for enhancing User Equipment (UE) handling of Non-Access Stratum (NAS) signaling connection release is provided. A UE establishes a NAS signaling connection with a mobile communication network belonging to a Public Land Mobile Network (PLMN). The UE receives a NAS message including a Closed Access Group (CAG) information list from the mobile communication network while camping on a CAG cell. The UE starts a timer in response to determining that no entry for the current PLMN is included in the received CAG information list. The UE locally releases the established NAS signaling connection upon expiry of the timer.

Enhancements on user equipment (UE) handling of non-access stratum (NAS) signaling connection release

A method of a relay user equipment (UE) can include receiving, at the relay UE, from a first neighbor UE, a communication request message for establishing a connection between an initiating UE and a target UE, the communication request message including first security-establishment-related information originating from the initiating UE for establishing a security association between the initiating UE and the target UE; modifying the communication request message to add second security-establishment-related information for establishing a security association between the relay UE and a second neighbor UE; and transmitting to the second neighbor UE the modified communication request message that includes the first security-establishment-related information originating from the initiating UE for establishing the security association between the initiating UE and the target UE, and the second security-establishment-related information added by the relay UE for establishing the security association between the relay UE and the second neighbor UE.

Security mechanism for connection establishment over multi-hop sidelinks

Solutions pertaining to user equipment (UE) and network behavior at and after a network disaster in mobile communications are proposed. An apparatus, implemented in or as a UE, determines whether a disaster condition is met with respect to a first public land mobile network (PLMN). The apparatus then selects a second PLMN according to information listing one or more PLMNs which are allowed to be selected by the UE when the disaster condition is met. The apparatus also attempts a registration in the second PLMN.

UE and network behavior at and after a network disaster

A method for expedited tunnel establishment with a non-Third Generation Partnership Project (3GPP) interworking gateway to access a 3GPP network is provided. A User Equipment (UE) initiates establishment of an Internet Protocol secure (IPsec) tunnel with a first non-3GPP interworking gateway associated with the 3GPP network. The UE probes availability of a second non-3GPP interworking gateway associated with the 3GPP network before the IPsec tunnel with the first non-3GPP interworking gateway is established successfully. The UE initiates establishment of an IPsec tunnel with the second non-3GPP interworking gateway in response to failing to establish the IPsec tunnel with the first non-3GPP interworking gateway and the second non-3GPP interworking gateway being available. The UE accesses the 3GPP network over the IPsec tunnel with the second non-3GPP interworking gateway.

Apparatuses and methods for expedited tunnel establishment with a non-third generation partnership project (3GPP) interworking gateway to access a 3GPP network

A method for enhancing User Equipment (UE) handling of UE Route Selection Policy (URSP) rules selection is provided. A UE initiates to send a Protocol Data Unit (PDU) of an application to a mobile communication network. The UE determines that it has no URSP signaled from the mobile communication network. In response to there being pre-configured URSP rules of a Home Public Land Mobile Network (HPLMN) in a Universal Subscriber Identity Module (USIM), the UE uses only the pre-configured URSP rules of the HPLMN in the USIM to derive configuration of a PDU session via which to send the PDU of the application.

Enhancements on user equipment (UE) handling of UE route selection policy (URSP) rules selection

A method for enhancing User Equipment (UE) handling in a limited service state over non-Third Generation Partnership Project (non-3GPP) access is provided. A UE sends a REGISTRATION REQUEST message or a SERVICE REQUEST message to a Public Land Mobile Network (PLMN) over non-3GPP access. The UE receives a REGISTRATION REJECT message or a SERVICE REJECT message from the PLMN over non-3GPP access. In particular, the REGISTRATION REJECT message or the SERVICE REJECT message indicates serving network not authorized. In response to the reception of the REGISTRATION REJECT message or the SERVICE REJECT message which indicates serving network not authorized, the UE enters a limited service state and performs a non-3GPP access network selection.

Enhancements on user equipment (UE) handling in a limited service state over non-third generation partnership project (3GPP) access

Aspects of the disclosure provide methods and apparatuses. The method can include receiving, at a user equipment (UE), system information broadcast from one or more base stations which may be shared by one or more PLMNs and/or one or more SNPNs, the system information including an indication of whether accessing an SNPN using home service provider (HSP) subscription of a HSP network is supported. The UE can be configured with subscription information of the HSP network. The subscription information can include the HSP subscription and a selection list that includes one or more candidate networks each represented by an SNPN identifier. The method can further include responsive to the system information, selecting a network from the selection list according to a priority order of the candidate networks, and accessing the network selected from the selection list using the HSP subscription.

Network selection for supported standalone non-public network (S-SNPN)

Aspects of the disclosure provide methods and apparatuses. The method can include receiving, at a user equipment (UE), system information broadcast from a base station which may be shared by one or more PLMNs and SNPNs, the system information including an indication of whether accessing an SNPN using home service provider (HSP) subscription of a HSP network is supported. The UE can be configured with subscription information of the HSP network. The subscription information can include the HSP subscription and a home SP selection list that includes one or more candidate networks each represented by an SNPN identifier. The method can further include responsive to the system information, selecting a network from the home SP selection list according to a priority order of the candidate networks, and accessing the network selected from the home SP selection list using the HSP subscription.

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a ME/UE. The ME/UE determines whether there is a closed access group (CAG) information list stored in a USIM utilized by the ME. The CAG information list includes an entry that specifying a public land mobile network (PLMN) ID and a CAG ID that in combination uniquely identify a CAG cell. When the CAG information list is detected: the ME/UE maintains the CAG information list for selecting the CAG cell for the ME to access; the ME/UE searches for the CAG cell according to the CAG information list.

Enhanced mechanism for accessing non-public network

A PDU session status information element (IE) is used to bi-directionally synchronize the state of a multi-access (MA) Protocol data unit (PDU) session between UE and NW. In the downlink, the PDU session status IE is included in a 5GMM message sent from NW to UE over an access type, and it indicates the user plane resources are NOT established at NW side on the access type the 5GMM message is sent over. For MA PDU sessions having user plane resources established in the UE side only on the access type the 5GMM message is sent over, the UE performs a local release of those MA PDU sessions. For MA PDU sessions having user plane resources established in the UE side on both access types, the UE performs a local release on the user plane resources on the access type the 5GMM message is sent over.

Multi-access PDU session state synchronization between UE and network

Aspects of the disclosure provide an electronic apparatus and methods for wireless communication. The electronic apparatus can include processing circuitry configured to identify, during an inter-system change of the electronic apparatus from a source network system to a target network system, at least one source session bearer between the electronic apparatus and the source network system. The processing circuitry can further map the at least one identified source session bearer to at least one target session bearer based on a mapping relationship that matches the at least one identified source session bearer with the at least one target session bearer to be established between the electronic apparatus and the target network system.

Method and apparatus for inter-system change in wireless communication

A method of maintaining a proper forbidden tracking area identifier (TAI) list is proposed. A UE receives a service area list comprising one or more allowed tracking areas. The service area list may be carried by a configuration update command. UE compares if any of the allowed tracking area having a matching TAI in the forbidden TAI list. Accordingly, UE removes any allowed tracking areas having a matching TAI from the forbidden TAI list. In one embodiment, UE sends a REGISTRATION REQUEST message to initiate a registration procedure. In response, UE receives a REGISTRATION ACCEPT message, which may also carry a service area list. UE may remove the allowed tracking area having a matching TAI from the forbidden TAI list. However, if UE is registered for emergency services, then UE shall not remove the allowed tracking area from the forbidden TAI list.

Maintenance of forbidden tacking area list in NR systems

Methods and apparatus are provided for inter-RAT bearer change for the 3GPP network. In one novel aspect, a bearer termination procedure is performed upon detecting one or more triggering events for the inter-RAT bearer modification. In one embodiment, the UE established the 4G EPS bearer. The UE successfully performs a bearer change from 4G to 3G. Subsequently, the UE detects missing mandatory parameters during inter-RAT bearer change from 3G to 2G in an idle state. The UE performs bearer termination by releasing the PDP context. In one embodiment, the PDP context is locally released. In other embodiments, the UE explicitly releases bearer using the PDP context deactivation procedure. The locally released procedure can be triggered by the UE, or by the network, or by both the UE and the network. The explicitly PDP context release procedure can be triggered by the UE, or by the network, or by both the UE and the network.

Method of inter-RAT bearer change for 3GPP system

Solutions are proposed to facilitate the support of 3GPP PS_Data_Off feature. The PS_Data_Off feature prevents transport via 3GPP access of all IP packets except those related to 3GPP PS_Data_Off Exempt Services. In one example, signaling storms due to frequent PS_Data_Off reconfiguration are prevented. In another example, for multi-SIM devices and for devices that supporting WiFi access, UE reconfigures the PS_Data_Off feature upon a triggering condition is satisfied. In yet another example, upon status change of PS_Data_Off feature, UE initiates RAT change to improve performance, to reduce power consumption and cost, and to maintain service continuity. Furthermore, new AT commands and parameters are introduced to enable the PS_Data_Off feature.

Growing community of inventors

Taipei, Taiwan

Yuan-Chieh Lin