# US 10,455,577 B2 · Base station device, gateway device, call connecting method, and wireless communication system

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- Number: US 10,455,577 B2
- Document ID: US10455577B2
- Status: Granted
- Kind: B2
- Application number: 15/240,929
- Filed: 2016-08-18
- Published: 2016-12-08
- Granted: 2019-10-22
- Earliest claimed: 2008-10-30
- Assignees: Sun Patent Trust
- Applicants: Sun Patent Trust
- Inventors: Takeshi Kanazawa; Yoshikazu Ishii
- Web page: https://patentgrep.com/patent/US10455577B2

## CPC

- H04M 3/16: with lock-out or secrecy provision in party-line systems
- H04M 7/1235: {where one of the core networks is a wireless network}
- H04W 12/06: Authentication
- H04W 12/062: Pre-authentication
- H04W 40/005: {Routing actions in the presence of nodes in sleep or doze mode}
- H04W 68/00: User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W 68/02: Arrangements for increasing efficiency of notification or paging channel
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04M 3/205: {Eavesdropping prevention - indication of insecurity of line or network}
- H04M 2207/18: wireless networks
- H04W 84/045: {using private Base Stations, e.g. femto Base Stations, home Node B}
- H04W 88/02: Terminal devices
- H04W 88/08: Access point devices
- H04W 88/16: Gateway arrangements
- H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A system is provided which is capable of connecting a call without degrading the security level in a mobile terminal network, even when a call addressed to a user equipment (UE) arrives via the Internet or a home network. A femto base station receives a packet addressed to a UE via the Internet or a home network, and starts a paging procedure. The UE establishes an RRC connection to the femto base station. The UE transmits, to the femto base station, a paging response addressed to the SGSN. The femto base station performs NAS verification. If the femto base station detects the paging response to a paging request that the femto base station itself has issued, the femto base station changes the service type of the service request received from the UE from the paging response to signaling.

## Claims

### Claim 1

A traffic offload system comprising:
a user equipment (UE), and
a traffic offloading apparatus including:
a pager which, in operation, pages the UE in idle mode for downlink offload traffic arriving at the traffic offloading apparatus;
a receiver which, after the pager having paged the UE, receives from the UE a service request message, wherein a service type of the service request message indicates a paging response;
a controller which, in operation, modifies the service type of the service request message from indicating the paging response to indicating a UE-initiated service request; and
a transmitter which, in operation, sends the modified service request message to a Serving General Packet Radio Service (GPRS) Support Node (SGSN),
wherein the traffic offloading apparatus is an intermediate node between the UE and the SGSN.

### Claim 2 (depends on 1)

The traffic offload system according to claim 1, wherein the traffic offloading apparatus is a femto base station.

### Claim 3 (depends on 1)

The traffic offload system according to claim 1, wherein the traffic offloading apparatus has a Gateway General Support Node (GGSN) functionality.

### Claim 4 (depends on 1)

The traffic offload system according to claim 1, wherein the traffic offloading apparatus has a SGSN functionality.

### Claim 5

A method of traffic offload performed by a user equipment (UE), the method comprising:
in response to being paged by a traffic offloading apparatus for downlink offload traffic arriving at the traffic offloading apparatus when the UE is in idle mode, transmitting a service request message to the traffic offloading apparatus, wherein a service type of the service request message indicates a paging response; and
triggering the traffic offloading apparatus to modify the service type of the service request message from indicating the paging response to indicating a UE-initiated service request and to send the modified service request message to a Serving General Packet Radio Service (GPRS) Support Node (SGSN),
wherein the traffic offloading apparatus is an intermediate node between the UE and the SGSN.

### Claim 6 (depends on 5)

The method of traffic offload according to claim 5, wherein the traffic offloading apparatus is a femto base station.

### Claim 7 (depends on 5)

The method of traffic offload according to claim 5, wherein the traffic offloading apparatus has a Gateway General Support Node (GGSN) functionality.

### Claim 8 (depends on 5)

The method of traffic offload according to claim 5, wherein the traffic offloading apparatus has a SGSN functionality.