Hardware-based beacon processing

• US 9,209,988 B2
• Filed: 08/02/2012
• Issued: 12/08/2015
• Est. Priority Date: 01/08/2007
• Status: Active Grant

• Current Assignee: Nordic Semiconductor ASA
• Original Assignee: Imagination Technologies Limited (Imagination Technologies Group Ltd.)
• Inventors: Aldaz, Luis Jr., Barman, Kaushik, Johnson, Allan A., Malladi, Raghavendra
• Primary Examiner(s): Nguyen, Steven H
• Application Number:
  US13/564,726
• Publication Number:
  US 20130058267A1
• Time in Patent Office: 1,223 Days
• Field of Search: 370/311, 340/7.32
• US Class Current: 1/1
• CPC Class Codes: H04L 12/40013 Details regarding a bus controller

Abstract

A battery-powered WLAN communication device has an activity sensor operable to identify an available packet. A PHY module is awakened to begin receiving the packet. The PHY module decodes a full MAC address from a MAC portion of a header of the packet. A MAC address parser receives the MAC address and determines whether the packet is to be received by comparing the full MAC address to a MAC address of the WLAN communication device. The MAC address parser is awakened to perform the comparing and shutdown after. Packets to be received include beacon packets. A hardware centric MAC separate from the MAC address parser has a beacon processor capable of being awakened from a shutdown state to process a beacon packet. The PHY module, the MAC address parser, and the beacon processor module are operable to be awakened and shutdown independently of each other and of a microprocessor.

Claims

1. A battery-powered Wireless Local Area Network (WLAN) communication device comprising:

an activity sensor operable to identify a packet available to be received at the WLAN communication device;

a physical layer (PHY) module to be awakened to begin receiving the packet, the PHY module operable to decode a full MAC address from a media access control portion of a header of the packet;

a MAC address parser coupled to the PHY module to receive the MAC address and to determine whether the packet is to be received at the WLAN communication device by comparing the full MAC address to a MAC address of the WLAN communication device, the MAC address parser operable to be awakened for performing the comparing and to be shut down after the comparing, wherein packets to be received include beacon packets; and

a hardware centric Medium Access Controller (MAC) separate from the MAC address parser and comprising a beacon processor capable of being awakened from a shutdown state to process a beacon packet, wherein the PHY module, the MAC address parser, and the beacon processor module are operable to be awakened and shutdown independently of each other and of a microprocessor.

2. The battery-powered Wireless Local Area Network (WLAN) communication device of claim 1, wherein the beacon processor is operable to deactivate after processing a beacon packet.

3. The battery-powered Wireless Local Area Network (WLAN) communication device of claim 1, wherein the MAC address parser is further operable to indicate that the packet being received is not for the WLAN communication device, resulting in shutdown of the PHY module, before completing reception of the packet, the PHY module being in shutdown for at least as long as an estimated remaining length of the packet being received.

4. An apparatus for receiving and transmitting packets of voice traffic over a wireless communication medium, comprising:

a microprocessor;

a memory communicatively coupled to said microprocessor;

a physical layer (PHY) module for decoding at least a header portion of a packet;

a MAC address parser coupled to the PHY module and operable to receive a full MAC address decoded from the packet by the PHY module and to determine whether the packet is to be further processed;

a hardware-centric medium access control (MAC) module communicatively coupled to the PHY module, and to be awakened by the MAC address parser, after determining that the packet is to be further processed, the hardware-centric MAC device comprising;

a packet receiver configured for receiving the packet, and

a beacon processing module configured to perform beacon processing without requiring use of the microprocessor, and activatable to process the packet if the packet is a beacon packet, the beacon processing module otherwise shutdown.

5. The apparatus of claim 4, wherein the PHY module is further operable to be deactivated while the packet is being transmitted on the wireless connection, responsive to a determination that the packet is not to be further received.

6. The apparatus of claim 5, wherein the PHY module is shut down for a time determine using packet duration information decoded from the packet by the PHY module.

7. The apparatus of claim 4, wherein the MAC address parser is operable to determine a match between the full MAC address and a MAC address to be received by the apparatus, while the PHY module is receiving the packet, and to shut down the PHY module before the packet has been fully received, responsible to determining that the packet is not be received by the apparatus.