FIELD

The present application relates to wireless communications, and more particularly to systems, apparatuses, and methods for detecting duplicate public warning system messages in a cellular communication system.

DESCRIPTION OF THE RELATED ART

Wireless communication systems are rapidly growing in usage. In recent years, wireless devices such as smart phones and tablet computers have become increasingly sophisticated. In addition to supporting telephone calls, many mobile devices (i.e., user equipment devices or UEs) now provide access to the internet, email, text messaging, and navigation using the global positioning system (GPS), and are capable of operating sophisticated applications that utilize these functionalities. Additionally, there exist numerous different wireless communication technologies and standards. Some examples of wireless communication standards include GSM, UMTS (associated with, for example, WCDMA or TD-SCDMA air interfaces), LTE, LTE Advanced (LTE-A), NR, HSPA, 3GPP2 CDMA2000 (e.g., 1×RTT, 1×EV-DO, HRPD, eHRPD), IEEE 802.11 (WLAN or Wi-Fi), BLUETOOTH™, etc.

The ever increasing number of features and functionality introduced in wireless communication devices also creates a continuous need for improvement in both wireless communications and in wireless communication devices. In particular, it is important to ensure the accuracy of transmitted and received signals through user equipment (UE) devices, e.g., through wireless devices such as cellular phones, base stations and relay stations used in wireless cellular communications. In addition, increasing the functionality of a UE device can place a significant strain on the battery life of the UE device. Thus it is very important to also reduce power requirements for wireless communications while allowing the UE device to maintain good transmit and receive abilities for improved communications. Accordingly, improvements in the field are desired.

SUMMARY

Embodiments are presented herein of apparatuses, systems, and methods for detecting duplicate public warning system messages in a cellular communication system.

According to the techniques described herein, a wireless device may be able to determine when a public warning system message being broadcast by a cellular base station has already been received by the wireless device before acquisition of the public warning system message has been performed, and so to determine whether to acquire the public warning system message.

A number of techniques may be possible for facilitating such early duplicate public warning system message detection. Among such techniques, use of an explicitly or implicitly indicated validity period for public warning system messages, use of a public warning system message change indications provided during paging occasions (e.g., in conjunction with public warning system message notifications), use of valuetag indications provided in system information scheduling information, and/or any of various other techniques may be possible.

By using such techniques, a wireless device may be able to determine not to decode a public warning system message if it is able to determine that the public warning system message is a duplicate of a message already received by the wireless device. Thus, the wireless device may be able to avoid unnecessary power consumption by the wireless device to acquire a duplicate message, without impacting the ability of the wireless device to reliably receive and present public warning system messages to a user of the wireless device.

Note that the techniques described herein may be implemented in and/or used with a number of different types of devices, including but not limited to base stations, access points, cellular phones, portable media players, tablet computers, wearable devices, and various other computing devices.

This Summary is intended to provide a brief overview of some of the subject matter described in this document. Accordingly, it will be appreciated that the above-described features are merely examples and should not be construed to narrow the scope or spirit of the subject matter described herein in any way. Other features, aspects, and advantages of the subject matter described herein will become apparent from the following Detailed Description, Figures, and Claims.

