US Patent No. 9,237,429

METHOD AND SYSTEM FOR IMPLEMENTING PACKET SWITCH DOMAIN SHORT MESSAGE SERVICE, AND USER EQUIPMENT


Patent No. 9,237,429
Issue Date January 12, 2016 
Title Method And System For Implementing Packet Switch Domain Short Message Service, And User Equipment
Inventorship Hui Xu, Shenzhen (CN)
Assignee ZTE Corporation, Shenzhen, Guangdong Province (CN)

Claim of US Patent No. 9,237,429

1. A method for implementing a Packet Switched domain (PS) Short Message Service (SMS), comprising:
after receiving a request message containing an SMS-only indication transmitted by a user equipment, a mobility management
entity (MME) enquiring about a subscription information of the user equipment from a home subscriber server, and receiving
the subscription information of the user equipment returned by the home subscriber server; and

when the MME supports the PS SMS and the subscription information supports the PS SMS, the MME transmitting a request acceptance
message to the user equipment, the MME receiving and transmitting an SMS from and to the user equipment through a Packet Switched
domain; wherein, the request acceptance message comprises the following information: a Location Area Identity (LAI), which
is a non-broadcast LAI and is not associated with a Visitor Location Register (VLR); a Temporary Mobile Subscriber Identity
(TMSI), which is a reserved TMSI; and an International Mobile Subscriber Identity (IMSI) attach which is for a purpose of
SMS-only;

when the MME supports the PS SMS, the MME further transmitting an indication that the PS SMS is supported to the home subscriber
server;

after receiving the indication that the PS SMS is supported, the home subscriber server registering the MME as an SMS serving
node of the user equipment.