Patent Application
20080320492
Currently, a network interface card (NIC), either wired or wireless, uses the PME signal to bring a system from an idle or sleep mode (also referred to herein as S3, S4 or S5 states) back to the active state (also referred to herein as the S0 state). This mechanism is often referred to as Wake-on-LAN or Wake-on-Wireless-LAN. An example using this mechanism is a NIC that wakes the system up when the incoming packet matches a fixed pattern. While this mechanism allows the system to stay in the low power state (S3/S4) and only wakes up when there is a meaningful thing to do, it is also very limited, in terms of types or degrees of wakes.
Thus, a strong need exists for apparatus and methods using intelligent wake mechanisms.
The subject matter regarded as the invention is particularly pointed out and distinctly claimed in the concluding portion of the specification. The invention, however, both as to organization and method of operation, together with objects, features, and advantages thereof, may best be understood by reference to the following detailed description when read with the accompanying drawings in which:
It will be appreciated that for simplicity and clarity of illustration, elements illustrated in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements are exaggerated relative to other elements for clarity. Further, where considered appropriate, reference numerals have been repeated among the figures to indicate corresponding or analogous elements.
In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be understood by those skilled in the art that the preset invention may be practiced without these specific details. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be understood by those of ordinary skill in the art that the invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, units and/or circuits have not been described in detail so as not to obscure the invention.
Embodiments of the invention may be used in a variety of applications. Some embodiments of the invention may be used in conjunction with various devices and systems, for example, a transmitter, a receiver, a transceiver, a transmitter-receiver, a wireless communication station, a wireless communication device, a wireless Access Point (AP), a modem, a wireless modem, a Personal Computer (PC), a desktop computer, a mobile computer, a laptop computer, a notebook computer, a tablet computer, a server computer, a handheld computer, a handheld device, a Personal Digital Assistant (PDA) device, a handheld PDA device, a network, a wireless network, a Local Area Network (LAN), a Wireless LAN (WLAN), a Metropolitan Area Network (MAN), a Wireless MAN (WMAN), a Wide Area Network (WAN), a Wireless WAN (WWAN), devices and/or networks operating in accordance with existing IEEE 802.16e, 802.20, 3 GPP Long Term Evolution (LTE) etc. and/or future versions and/or derivatives and/or Long Term Evolution (LTE) of the above standards, a Personal Area Network (PAN), a Wireless PAN (WPAN), units and/or devices which are part of the above WLAN and/or PAN and/or WPAN networks, one way and/or two-way radio communication systems, cellular radio-telephone communication systems, a cellular telephone, a wireless telephone, a Personal Communication Systems (PCS) device, a PDA device which incorporates a wireless communication device, a Multiple Input Multiple Output (MIMO) transceiver or device, a Single Input Multiple Output (SIMO) transceiver or device, a Multiple Input Single Output (MISO) transceiver or device, a Multi Receiver Chain (MRC) transceiver or device, a transceiver or device having “smart antenna” technology or multiple antenna technology, or the like. Some embodiments of the invention may be used in conjunction with one or more types of wireless communication signals and/or systems, for example, Radio Frequency (RF), Infra Red (IR), Frequency-Division Multiplexing (FDM), Orthogonal FDM (OFDM), Orthogonal Frequency-Division Multiple Access (OFDMA), Time-Division Multiplexing (TDM), Time-Division Multiple Access (TDMA), Extended TDMA (E-TDMA), Code-Division Multiple Access (CDMA), Multi-Carrier Modulation (MDM), Discrete Multi-Tone (DMT), Bluetooth (RTM), ZigBee (TM), or the like. Embodiments of the invention may be used in various other apparatuses, devices, systems and/or networks.
Although embodiments of the invention are not limited in this regard, discussions utilizing terms such as, for example, “processing,” “computing,” “calculating,” “determining,” “establishing”, “analyzing”, “checking”, or the like, may refer to operation(s) and/or process(es) of a computer, a computing platform, a computing system, or other electronic computing device, that manipulate and/or transform data represented as physical (e.g., electronic) quantities within the computer's registers and/or memories into other data similarly represented as physical quantities within the computer's registers and/or memories or other information storage medium that may store instructions to perform operations and/or processes.
Although embodiments of the invention are not limited in this regard, the terms “plurality” and “a plurality” as used herein may include, for example, “multiple” or “two or more”. The terms “plurality” or “a plurality” may be used throughout the specification to describe two or more components, devices, elements, units, parameters, or the like. For example, “a plurality of stations” may include two or more stations.
An embodiment of the present invention provides an intelligent wake apparatus and method. In this embodiment of the present invention, the device driver and the embedded software (FW or microcode) agree on a set of wake codes and wake behaviors associated with the wake codes. When the device encounters a wake event, the device first adds the wake code to the command queue, then it drives the PME pin to high to wake the system from S3/S4 to S0. When the system wakes up from S3/S4, the device driver first restores its context, then it will receive an interrupt from the device regarding the wake code.
In an embodiment of the present invention and not limited in this respect, the device driver manages the wake behavior of the system accordingly. The possible wake behaviors may be (but are not limited to) full wake up, temporary wake up in order to execute a short piece of code and return to sleep, wakeup until a certain task completes (e.g. email sync, phone call), a partial wakeup during which only select parts of the system are powered/executing, etc. For instance, when a system in standby is roaming between access points (APs) in a wireless local area network (WLAN), the wireless NIC is in a low-power monitoring state and monitors any incoming packets, as well as maintains its connectivity such as re-authentication when roaming into a different extended service sets (ESS). In this case, in an embodiment of the present invention, the wireless NIC may issue a (re)authentication wake code to the host system, the host system wakes up, only wakes up a partial system (no hard drive, audio subsystem, LCD, and etc), starts the re-authentication procedure and then returns to standby state (S3/S4).
Turning now to the figures,
While certain features of the invention have been illustrated and described herein, many modifications, substitutions, changes, and equivalents may occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.
