# US 8,543,174 B2 · Methods and apparatus for reducing power consumption for mobile devices using broadcast-to-unicast message conversion > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,543,174 B2 - Document ID: US8543174B2 - Status: Granted - Kind: B2 - Application number: 13/611,569 - Filed: 2012-09-12 - Published: 2013-01-03 - Granted: 2013-09-24 - Earliest claimed: 2006-04-28 - Assignees: BlackBerry Limited - Applicants: Leonardo Jose Silva Salomone; Thomas Charles Nagy; Arjuna Sivasithambaresan; Matt Milardovic - Inventors: Leonardo Jose Silva Salomone; Thomas Charles Nagy; Arjuna Sivasithambaresan; Matt Milardovic - Web page: https://patentgrep.com/patent/US8543174B2 ## CPC - H04W 52/0225: {using monitoring of external events, e.g. the presence of a signal} - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A mobile device sends to a message a wireless network. The message indicates a plurality of different protocol types of broadcast messages to be processed as broadcast-to-unicast messages during a low power mode of operation of the mobile device. The protocol type of a given broadcast message is identifiable in a protocol identifier field of the broadcast message. The mobile device maintains its wireless receiver in a powered down state during the low power mode of operation while broadcast messages are broadcasted from the wireless network. For each broadcast message of each said indicated protocol type provided in the message sent to the wireless network, the mobile device monitors to receive via the wireless receiver a unicast message from the wireless network. The mobile device identifies broadcast message information of the broadcast message within the unicast message. ## Claims ### Claim 1 A method in a mobile device configured for communications in a wireless network with use of a wireless receiver, the method comprising: sending a message to the wireless network, the message indicating a plurality of different protocol types of broadcast messages to be processed as broadcast-to-unicast messages in a low power mode of operation of the mobile device, the protocol type of a given broadcast message being identifiable in a protocol identifier field of the broadcast message; maintaining at least a portion of the wireless receiver in a powered down state during the low power mode of operation while broadcast messages are broadcasted from the wireless network; and for each broadcast message of each said indicated protocol type provided in the message sent to the wireless network, monitoring to receive via the wireless receiver a unicast message from the wireless network and identifying broadcast message information of the broadcast message within the unicast message. ### Claim 2 (depends on 1) The method of claim 1, further comprising: for each broadcast message of a protocol type that is different from any one of said indicated protocol types: failing to receive any unicast message having broadcast message information of the broadcast message. ### Claim 3 (depends on 1) The method of claim 1, wherein identifying the broadcast message information within the unicast message comprises the further act of decapsulating the unicast message to identify the broadcast message. ### Claim 4 (depends on 1) The method of claim 1, further comprising: processing an instruction in response to the broadcast message information. ### Claim 5 (depends on 1) The method of claim 1, wherein the mobile communication device communicates in accordance with IEEE 802.11. ### Claim 6 (depends on 1) The method of claim 1, wherein the protocol type of a given broadcast message is defined in a protocol identifier field of a sub network access protocol (SNAP) header of the broadcast message, and wherein said indicated protocol types in the message are SNAP types. ### Claim 7 (depends on 1) The method of claim 1, wherein said indicated protocol types in the message include an Internet Protocol (IP) type. ### Claim 8 (depends on 1) The method of claim 1, wherein said indicated protocol types in the message include an Address Resolution Protocol (ARP) type. ### Claim 9 (depends on 1) The method of claim 1, wherein the message having said indicated protocol types excludes an indication of a network basic input/output system (NetBIOS) type, and maintaining the wireless receiver in the powered down state comprises maintaining the wireless receiver in the powered down state during broadcasts of broadcast messages of the NetBIOS type. ### Claim 10 (depends on 1) The method of claim 1, wherein the message having said indicated protocol types excludes an indication of an Intel type, and maintaining the wireless receiver in the powered down state comprises maintaining the wireless receiver in the powered down state during broadcasts of broadcast messages of the Intel type. ### Claim 11 A mobile communication device, comprising: a wireless receiver; a wireless transmitter; one or more processors coupled to the wireless receiver and the wireless transmitter; the one or more processors being configured to: cause a message to be sent to a wireless network via the wireless transmitter, the message indicating a plurality of different protocol types of broadcast messages to be processed as broadcast-to-unicast messages for the mobile device during a low power mode of operation, the protocol type of a given broadcast message being identifiable in a protocol identifier field of the broadcast message; maintain at least a portion of the wireless receiver in a powered down state during the low power mode of operation while broadcast messages are broadcasted from the wireless network; and for each broadcast message of each said indicated protocol type provided in the message sent to the wireless network, receive via the wireless receiver a unicast message from the wireless network and identify broadcast message information of the broadcast message within the unicast message. ### Claim 12 (depends on 11) The mobile device of claim 11, wherein the one or more processors are further configured to: for each broadcast message of a protocol type that is different from any one of said indicated protocol types: fail to receive any unicast message having broadcast message information of the broadcast message. ### Claim 13 (depends on 11) The mobile device of claim 11, wherein the one or more processors are configured to identify the broadcast message information within the unicast message by decapsulating the unicast message to identify the broadcast message. ### Claim 14 (depends on 11) The mobile device of claim 11, wherein the one or more processors are further configured to process an instruction in response to the broadcast message information. ### Claim 15 (depends on 11) The mobile device of claim 11, which communicates in accordance with IEEE 802.11 with a wireless network comprising a wireless local area network (WLAN). ### Claim 16 (depends on 11) The mobile device of claim 11, wherein the one or more processors are further configured to set a DTIM period to infinity for the low power mode of operation. ### Claim 17 (depends on 11) The mobile device of claim 11, wherein the protocol type of a given broadcast message is defined in a protocol identifier field of a sub network access protocol (SNAP) header of the broadcast message, and wherein said indicated protocol types in the message are SNAP types. ### Claim 18 (depends on 11) The mobile device of claim 11, wherein said indicated protocol types in the message include an Internet Protocol (IP) type. ### Claim 19 (depends on 11) The mobile device of claim 11, wherein the message having said indicated protocol types excludes an indication of a network basic input/output system (NetBIOS) type, and the one or more processors are further configured to maintain the wireless receiver in the powered down state by maintaining the wireless receiver in the powered down state during all broadcasts of broadcast messages of the NetBIOS type. ### Claim 20 (depends on 11) The mobile device of claim 11, wherein the message having said indicated protocol types excludes an indication of an Intel type, and maintaining the wireless receiver in the powered down state comprises maintaining the wireless receiver in the powered down state during broadcasts of broadcast messages of the Intel type.