US Patent No. 9,241,254

METHOD AND SYSTEM FOR DETERMINING REACHABILITY OF TERMINAL GROUP


Patent No. 9,241,254
Issue Date January 19, 2016 
Title Method And System For Determining Reachability Of Terminal Group
Inventorship Kun Yang, Shenzhen (CN)
Assignee ZTE Corporation, Shenzhen, Guangdong (CN)

Claim of US Patent No. 9,241,254

1. A method for determining reachability of a terminal group, comprising:
when a service network element needs to acquire the reachability of the terminal group, sending, by the service network element,
a terminal group reachability notification request message to a Home Subscriber Server (HSS), wherein the terminal group reachability
notification request message comprises information of the terminal group; and

when the HSS determines that the terminal group is reachable, notifying, by the HSS, the service network element that the
terminal group is reachable;

wherein the operation that the HSS determines that the terminal group is reachable comprises:
after the HSS receives the terminal group reachability notification request message, the HSS sets a terminal Group Reachability
Request Parameter (GRRP) locally, and forwards the terminal group reachability notification request message to a Mobility
Management Entity (MME); and

after the MME receives the terminal group reachability notification request message from the HSS,
when the MME locally detects, according to the information of the terminal group, that a Paging Proceed Flag (PPF) of a representative
terminal of the terminal group has not been cancelled, the MME determines that the terminal group is reachable, and the MME
notifies the HSS that the terminal group is reachable; and after the HSS receives the notification that the terminal group
is reachable, the HSS cancels the terminal GRRP locally; or

when the MME detects that the PPF of the representative terminal of the terminal group has been cancelled, the MME sets the
terminal GRRP locally, and after the MME locally detects an activity event of the representative terminal of the terminal
group according to the information of the terminal group, the MME sends a terminal group activity notification message to
the HSS and locally cancels the terminal GRRP; and after the HSS receives an update location message of the representative
terminal of the terminal group or the terminal group activity notification message from the MME, the HSS determines that the
terminal group is reachable, and the HSS cancels the terminal GRRP locally.