US Patent No. 11,116,039

METHOD AND APPARATUS FOR SUPPORTING USER'S MOBILITY OVER A LOCAL AREA DATA NETWORK


Patent No. 11,116,039
Issue Date September 07, 2021
Title Method And Apparatus For Supporting User's Mobility Over A Local Area Data Network
Inventorship Yongcui Li, Beijing (CN)
Hui Ni, Beijing (CN)
Yan Li, Beijing (CN)
Assignee Huawei Technologies Co., Ltd., Guangdong (CN)

Claim of US Patent No. 11,116,039


1. A method for supporting a local area data network (LADN), comprising:determining, by a session management function (SMF) network element, whether a first condition is met, wherein the first condition comprises: a first location of a user equipment (UE) is outside a service area (SA) of a LADN;
in response to determining that the first condition is met,determining, by the SMF network element, a first policy from a plurality of policies based on an LADN name and user information;
notifying, by the SMF network element, an user plane function (UPF) network element to enable a timer;
stopping, by the SMF network element, data transmission of an LADN packet data unit (PDU) session of the LADN based on the first policy, wherein stopping the data transmission of the LADN PDU session comprises notifying the user plane function (UPF) network element to buffer or discard downlink data received before the timer expires; and
maintaining, by the SMF network element based on the first policy, a resource of the LADN PDU session before the timer expires;
receiving, by the UPF network element, downlink data after the timer expires;
in response to receiving the downlink data after the timer expires, sending, by the UPF network element, a downlink data notification to the SMF network element; and
when the timer expires and in response to receiving the downlink data notification from the UPF network element, triggering, by the SMF network element, the LADN PDU session to enter an activation state,
wherein a duration of the timer is less than a duration of periodic location update received from an access and mobility management function (AMF) network element.