DE102015203508B4 - Wi-Fi preamble field of low energy - Google Patents

Abstract

A method, comprising: by a wireless device: receiving a wireless transmission, wherein the wireless transmission comprises a Physical Layer (PHY) preamble and PHY data, wherein a legacy portion of the PHY preamble has destination information indicative of a destination , and having length information indicating a length of the wireless transmission; determining whether the wireless transmission is for the wireless device or not based on the destination information; and dropping a remaining portion of the wireless transmission if the wireless transmission is not intended for the wireless device.

Description

priority claim

The present application claims the benefit of the priority of the provisional US Patent Application No. 61 / 948,754 entitled "Wi-Fi Low Energy Preamble Field" and filed on March 6, 2014 and provisional application No. 61 / 948,757 entitled "Wi-Fi Low Energy Preamble Using an L-LTF Field and filed Mar. 6, 2014, both of which are incorporated herein by reference in their entirety when fully and fully incorporated herein by reference all set forth herein.

area

The present disclosure relates to wireless communication, the techniques for performing wireless communication with reduced power consumption, and / or earlier display of control information in systems such as IEEE 802.11 wireless systems.

Description of the related techniques

The use of wireless communication systems is increasing rapidly. In addition, there are many different wireless communication technologies and standards. Some examples of wireless communication standards include GSM, UMTS (in conjunction with, for example, WCDMA or TD-SCDMA air interfaces), LTE, LTE-Advanced (LTE-A), HSPA, 3GPP2 CDMA2000 (eg, ixRTT, ixEV-DO, HRPD, eHRPD). , IEEE 802.11 (Wi-Fi or Wi-Fi), IEEE 802.16 (WiMax), Bluetooth and others.

Many devices that implement such wireless communication systems are essentially mobile devices that rely heavily on wireless power (e.g., batteries). For such devices, as well as for other devices in general, the considerations of energy consumption for implementing the wireless technologies may be significant. For example, battery life may affect consumer preference for possible wireless devices.

US 8072980 B1 describes processing frames in wireless networks, including predicting, prior to transmitting a first frame, a source address, and a destination address of a second frame to be transmitted after the transmission of the first frame, generating a predictor field that includes information that the predicted source address and the predicted destination address of the second frame, and appending the predictor field to the first frame. The focus of the method is on the prediction or information of future frames.

Summary

This document describes, inter alia, low power IEEE 802.11 (Wi-Fi) wireless communication methods and describes wireless devices configured to implement the described methods.

Wi-Fi transmissions can generally be constructed as having different physical layer (PHY) preamble fields, followed by PHY data that includes encapsulated header information for higher layer and / or payload data.

Wi-Fi can use Carrier Sensing as a multiple access technology. In this case, a Wi-Fi device may at least temporarily monitor (scan) the Wi-Fi wireless media for transmissions by other Wi-Fi devices to determine whether the medium is busy or free (eg, if it is buffered uplink). Has data and wants to use the medium for uplink transmission) and / or to determine if any transmissions are intended for the device.

It may be desirable for the device to spend more time monitoring the media than necessary to determine that the transmission is not intended for the device and to determine the anticipated length of the transmission to save power. After this determination has been made, the device may assume a low energy state (sleep) for the remainder of the transmission.

According to the techniques described herein, it may be possible to provide destination and length information early in the PHY preamble portion of a Wi-Fi transmission that reduces the amount of time it takes to determine the scheduled duration of the transmission and therefore increase the time duration. in which the device remains in the low-energy state, possibly reducing the power consumption of the device.

It may be possible to include the destination and length information for Wi-Fi transmission before or as part of a portion of the PHY preamble that is set up for channel estimation.

For example, a low energy signal field (LE-SIG) may precede the Legacy Long Training (L-LTF) field (currently used for channel estimation is used) and may include the destination and length information for the Wi-Fi transmission in which it is included. Such a field may be differently coded, if desired, because without the channel estimation, it may be difficult or impossible to use coherent coding (at least in some cases).

As another example, the destination and length information may be included for Wi-Fi transmission in the L-LTF field. In this case, it may be possible to obtain the backward compatibility, for example, by adding the BPSK signaling or the 90 degree rotated BPSK signaling over the two L-LTF training sequences in such a way that when merged, the additional Destination and length information is canceled and the channel estimation training sequence is recovered, but when subtracted from each other, the channel estimation training sequence is canceled and the additional destination and length information can be recovered.

Further, if desired, the L-LTF may generally be used to provide early signaling of control information by adding the information to the LTF training sequence, as in the manner described above. For example, the additional information may be formatted as an L-LTF control field, which may be defined as included subfields for any of various types of control information, such as one or all of packet destinations, MIMO indications (eg, how many RF chains). , Multi-user (MU) MIMO Vs. Single user (SU) MIMO hint, coding hint (eg BCC or LDPC), bandwidth hint (eg 20/30/80/160) and / or FFT size hint (eg 64/128/256/512 ). This may assist a receiving device by providing early detection of the packet destination, providing sufficient time budgets to operate the receive blocks according to particular parameters, and / or preparing the hardware reuse device (such as antenna chains).

The techniques described herein may be implemented and / or used in and / or with a variety of different types of devices including mobile phones, portable media players, wireless speaker systems, portable gaming devices, tablet computers, portable computing devices, remote controls, wireless speakers, set-top Box devices, television systems and computers may include but are not limited to.

The summary is intended to provide a brief overview of some of the items described in this document. Accordingly, it will be appreciated that the above-described features are only examples and should not be construed to in any way limit the scope and spirit of the subject matters described herein. Other features, aspects, and advantages of the objects described herein will become apparent from the following detailed description, figures, and claims.

list of figures

• 1-2 beispielhafte (und vereinfachte) drahtlose Kommunikationssysteme gemäß einiger Ausführungsformen darstellen;
• 3 ein Blockdiagramm einer beispielhaften drahtlosen Vorrichtung gemäß einiger Ausführungsformen zeigt;
• 4-5 Signalflussdiagramme sind, die Aspekte der beispielhaften Verfahren für die drahtlose Kommunikation gemäß einiger Ausführungsformen darstellen;
• 6-13 beispielhafte Implementierungsdetails möglicher Systeme darstellen, die Aspekte des Verfahrens der 4 implementieren, in welcher die Steuerungsinformation in dem L-LTF-Feld einer Wi-Fi-Übertragung gemäß einigen Ausführungsformen beinhaltet ist; und
• 14 - 19 beispielhafte Implementierungsdetails möglicher Systeme darstellen, die Aspekte des Verfahrens der 4 implementieren, in welcher Zielortinformation und Längeninformation in einem LE-SIG-Feld einer Wi-Fi-Übertragung beinhaltet sind, gemäß einiger Ausführungsformen.

A better understanding of the present subject matter can be obtained when the following detailed description of the preferred embodiment is considered in conjunction with the following drawings, in which:

• 1-2 illustrate example (and simplified) wireless communication systems according to some embodiments;
• 3 FIG. 12 shows a block diagram of an exemplary wireless device according to some embodiments; FIG.
• 4-5 Signal flow diagrams illustrating aspects of the example methods for wireless communication according to some embodiments;
• 6-13 Exemplary implementation details of possible systems that represent aspects of the method of 4 in which the control information in the L-LTF field is included in a Wi-Fi transmission according to some embodiments; and
• 14 - 19 Exemplary implementation details of possible systems that represent aspects of the method of 4 in which destination information and length information are included in a LE-SIG field of a Wi-Fi transmission, according to some embodiments.

While the features described herein may be affected by various modifications and alternative forms, it should be understood that certain embodiments thereof are shown by way of example only in the drawings and described in detail herein. It should be understood, however, that the drawings and detailed description thereof are not intended to be limiting to the particular form disclosed, but on the contrary, the invention is intended to cover all modifications, equivalents and alternatives that fall within the spirit and scope of the objects as defined by the appended claims.

Detailed description of the embodiments

terms

• Speichermedium - Irgendeines von verschiedenen Typen von nicht-flüchtigen Computer-zugänglichen Speichervorrichtungen oder Speichervorrichtungen. Der Begriff („Speichermedium“) ist dazu gedacht ein Installationsmedium, z.B. eine CD-ROM, floppy disk, oder Bandgerät („Tape Device“); einen Computersystemspeicher oder wahlfreier Zugriffspeicher wie DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM etc.; ein nicht-flüchtiges Speichermedium wie ein Flash, magnetische Medien, z.B. eine Festplatte, oder einen optischen Speicher; Register oder andere ähnliche Typen von Speicherelementen etc. einzubeziehen. Das Speichermedium kann andere Typen von nicht-flüchtigen Speichermedien als auch andere Kombinationen davon beinhalten. Zusätzlich kann das Speichermedium in einem ersten Computersystem eingerichtet sein, in welchem die Programme ausgeführt werden, oder kann in einem zweiten unterschiedlichen Computersystem eingerichtet sein, das das erste Computersystem über ein Netzwerk verbindet, wie Internet. Im letzteren Fall kann das zweite Computersystem Programmanweisungen an den ersten Computer zur Ausführung bereitstellen. Der Begriff „Speichermedium“ kann zwei oder mehrere Speichermedien beinhalten, die an unterschiedlichen Orten liegen, z.B. in unterschiedlichen Computersystemen, die über ein Netzwerk verbunden sind. Das Speichermedium kann Programmanweisungen speichern (z.B. als Computerprogramme ausgeführt), die von einem oder mehreren Prozessoren ausgeführt werden können.
• Trägermedium - ein Speichermedium, wie oben beschrieben, als auch ein physikalisches Übertragungsmedium, wie ein Bus, Netzwerk und/oder anderes physikalisches Übertragungsmedium kann Signale übertragen, wie elektrische, elektromagnetische oder digitale Signale.
• Programmierbares Hardware-Element - beinhaltet verschiedene Hardware-Vorrichtungen, die programmierbare Funktionsblöcke aufweisen, die über eine programmierbare Verbindung verbunden sind. Beispiele beinhalten FPGAs (Field Programmable Gate Arrays), programmierbare Logikbausteine PLDs (Programmable Logic Devices), FPOAs (Field Programmable Object Arrays) und CPLDs (Complex PLDs). Die programmierbaren Funktionsblöcke können von feingranularen (kombinatorische Logik oder Look-Up-Tabellen) bis hin zu grobgranularen (arithmetische Logikeinheiten oder Prozessorkerne) reichen. Ein programmierbares Hardware-Element kann auch als „rekonfigurierbare Logik“ („reconfigurable logic“) bezeichnet werden.
• Computersystem - irgendeines von verschiedenen Typen von Rechner- oder Verarbeitungssystemen, die ein Personal Computer System (PC), ein Mainframe-Computersystem, einen Arbeitsplatz, eine Netzwerk-Anwendung, eine Internet-Anwendung, eine Personal Digital Assistant (PDA), eine persönliche Kommunikationsvorrichtung, ein Smartphone, ein Fernsehsystem, Grid Computing System oder andere Vorrichtungen oder Kombinationen von Vorrichtungen beinhalten. Im Allgemeinen kann der Begriff „Computersystem“ breit definiert werden, um irgendeine Vorrichtung (oder Kombination von Vorrichtungen) zu umfassen, die mindestens einen Prozessor haben, der Anweisungen von einem Speichermedium ausführt.
• Station (STA) - irgendeine von verschiedenen Typen von Computersystemvorrichtung, die mobil oder tragbar sind und die drahtlose Kommunikationen durchführen. Beispiele der STAs beinhalten Mobiltelefone, Smartphones (z.B. iPhone™, Android™-basierte Telefone), tragbare Spielvorrichtungen (z.B. Nintendo DS™, PlayStation Portable™, Gameboy Advance™, iPhone™), Laptops, tragbare Vorrichtungen (z.B. smart watch, smart glasses), PDAs, tragbare Internetvorrichtungen, Musik-Player, Datenspeichervorrichtungen und andere Handheld-Vorrichtungen etc. Im Allgemeinen kann der Begriff „UE“ oder „UE-Vorrichtung“ breit definiert werden, um irgendeine elektronische, Rechner-, und/oder Telekommunikations-Vorrichtung (oder eine Kombination von Vorrichtungen) zu umfassen, die von einem Anwender leicht zu transportieren und für eine drahtlose Kommunikation geeignet ist.
• Basisstation oder Zugangspunkt („Access Point“) (AP) - Der Begriff „Basisstation“ hat den ganzen Umfang seiner ursprünglichen Bedeutung und beinhaltet zumindest eine drahtlose Kommunikationsstation, die an einem festen Standort installiert ist und dazu verwendet wird, um als Teil eines drahtlosen Kommunikationssystems oder eines Funksystems zu kommunizieren.
• Verarbeitungselement - bezieht sich auf verschiedene Elemente oder Kombinationen von Elementen. Die Verarbeitungselemente beinhalten beispielsweise Schaltungen wie anwendungsspezifische integrierte Schaltungen ASIC (Application Specific Integrated Circuit), Teile oder Schaltungen von einzelnen Prozessorkernen, komplette Prozessorkerne, programmierbare Hardware-Vorrichtungen, wie ein Field Programmable Gate Array (FPGA) und/oder größere Teile von Systemen, die mehrere Prozessoren beinhalten.
• Automatisch - bezieht sich auf eine Aktion oder eine Vorgang, der von einem Computersystem (z.B. Software, ausgeführt von einem Computersystem) oder einer Vorrichtung (z.B. Schaltung, programmierbare Hardware-Elemente, ASICs, etc.) durchgeführt werden, ohne Anwendereingaben, die die Aktion oder den Vorgang direkt festlegen oder durchführen. Daher steht der Begriff „Automatisch“ einem Vorgang gegenüber, der von einem Anwender manuell durchgeführt oder von Ihm festgelegt wird, wenn der Anwender die Eingaben bereitstellt, um den Vorgang direkt durchzuführen. Ein automatisches Verfahren kann durch Eingaben initiiert werden, die von dem Anwender bereitgestellt werden, aber die nachfolgenden Aktionen, die „automatisch“ durchgeführt werden, werden nicht von dem Anwender festgelegt, z.B. werden nicht „manuell“ ausgeführt, wenn der Anwender jede Aktion festgelegt, um diese durchzuführen. Zum Beispiel füllt ein Anwender das Formular manuell aus, wenn ein Anwender ein elektronisches Formular ausfüllt indem er jedes Feld auswählt und Eingaben bereitstellt, die Informationen festlegen (z.B. durch Eingeben von Information, Auswählen von Check-Boxen, Optionsschaltfläche etc.), selbst wenn das Computersystem das Formular in Antwort auf die Anwenderaktionen aktualisieren muss. Das Formular kann automatisch von dem Computersystem ausgefüllt werden, wenn das Computersystem (z.B. Software, die das Computersystem ausführt) die Felder des Formulars analysiert und das Formular ausfüllt ohne irgendeine Anwendereingabe, die die Antworten für die Felder festlegt. Wie oben angedeutet, kann der Anwender das automatische Ausfüllen des Formulars unterbrechen, aber ist in dem aktuellen Ausfüllen des Formulars nicht beteiligt (z.B. der Anwender legt nicht manuell Antworten für die Felder fest, sondern diese werden eher automatisch vervollständigt). Die vorliegende Beschreibung stellt verschiedene Beispiele von Vorgängen bereit, die automatisch in Antwort auf Aktionen durchgeführt werden, die der Anwender vorgenommen hat.
• PHY-Rate oder PHY-Datenrate - Eine Rate bei welcher Vorrichtungen mit einander oder über ein Medium kommunizieren. Viele drahtlose Kommunikationstechnologien (beinhaltend IEEE 802.11) können für die Verwendung unterschiedlicher Kombinationen von einer Modulationsart, einer Kodierungsrate, einer Anzahl räumlicher Ströme, Kanalbreiten und/oder Physical Layer-Eigenschaften bereitstellen. Jede Kombination kann zu (und in einigen Fällen benannt, als) eine „PHY-Rate“ führen. Die Kombination der Physical Layer-Eigenschaften, die zu einer vorgegebenen PHY-Rate führen, können auch als „Modulations- und Kodierungsschema“, „MCS“ oder „MCS-Index“ benannt werden. „Niedrigere“ oder „robustere“ PHY-Raten/MCS-Indexe können Empfängern eine größere Leistungsfähigkeit bereitstellen, um erfolgreich Information zu empfangen, die unter weniger-als-idealen Mediumseigenschaften als „höhere“ oder „weniger robuste“ PHY-Raten kommuniziert werden (z.B. unter Verwendung eines Modulationsschemas niedriger Dichte und/oder mit einem größeren Anteil an einer Fehlerberichtigungs-Kodierungs-Information), oft auf Kosten von potentiellem Durchsatz. Höhere und niedrigere PHY-Raten können, im Gegenteil, eine effizientere Verwendung des Mediums bereitstellen und einen höheren Durchsatz als niedrigere PHY-Raten bereitstellen (z.B. durch Verwendung eines Modulationsschemas hoher Dichte und/oder mit einem niedrigen Anteil an einer Fehlerberichtigungs-Kodierungs-Information), aber können schwieriger sein, um weniger-als-ideale Mediumseigenschaften zu empfangen.
• IEEE 802.11 - bezieht sich auf eine Technologie basierend auf dem IEEE 802.11-drahtlosen Standards, wie 802.11a, 802.11.b, 802.11g, 802.11n, 802.11-2012, 802.11ac und/oder anderen IEEE 802.11-Standards. Die IEEE 802.11-Technologie kann auch als „Wi-Fi“ oder als „Wireless Local Area Network (WLAN)“ Technologie bezeichnet werden.

The following is a glossary of terms used in this disclosure:

• Storage Medium - Any of various types of non-volatile computer-accessible storage devices or storage devices. The term ("storage medium") is intended to mean an installation medium, such as a CD-ROM, floppy disk, or tape device; a computer system memory or random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc .; a non-volatile storage medium such as a flash, magnetic media, eg a hard disk, or an optical storage; Include registers or other similar types of memory elements, etc. The storage medium may include other types of non-volatile storage media as well as other combinations thereof. In addition, the storage medium may be arranged in a first computer system in which the programs are executed, or may be arranged in a second different computer system connecting the first computer system via a network, such as the Internet. In the latter case, the second computer system may provide program instructions to the first computer for execution. The term "storage medium" may include two or more storage media located at different locations, eg, in different computer systems connected via a network. The storage medium may store program instructions (eg, executed as computer programs) that may be executed by one or more processors.
• Carrier medium - a storage medium as described above, as well as a physical transmission medium such as a bus, network and / or other physical transmission medium may transmit signals such as electrical, electromagnetic or digital signals.
• Programmable Hardware Element - includes various hardware devices having programmable functional blocks connected via a programmable link. Examples include Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (PLDs), FPOAs (Field Programmable Object Arrays), and Complex PLDs (CPLDs). The programmable function blocks can range from fine granular (combinational logic or look-up tables) to coarse granular (arithmetic logic units or processor cores). A programmable hardware element may also be referred to as "reconfigurable logic".
• Computer system - any of various types of computing or processing systems, including a personal computer system (PC), a mainframe computer system, a workstation, a network application, an Internet application, a personal digital assistant (PDA), a personal communications device , a smartphone, a television system, grid computing system or other devices or combinations of devices. In general, the term "computer system" can be broadly defined to include any device (or combination of devices) having at least one processor executing instructions from a storage medium.
• Station (STA) - any of various types of computer system devices that are mobile or portable and that perform wireless communications. Examples of STAs include mobile phones, smart phones (eg, iPhone ™, Android ™ based phones), portable gaming devices (eg, Nintendo DS ™, PlayStation Portable ™, Gameboy Advance ™, iPhone ™), laptops, portable devices (eg, smart watch, smart glasses In general, the term "UE" or "UE device" may be broadly defined to mean any electronic, computer, and / or telecommunications device (or a combination of devices) that is easy to carry by a user and suitable for wireless communication.
• Base Station or Access Point (AP) - The term "base station" has the full scope of its original meaning, and includes at least one wireless communication station installed at a fixed location and used to form part of a wireless communication system or a radio system.
• Processing Element - refers to different elements or combinations of elements. The processing elements include, for example, circuits such as application specific integrated circuits ASIC, parts or circuits of individual processor cores, complete processor cores, programmable hardware devices such as a field Programmable Gate Array (FPGA) and / or larger parts of systems containing multiple processors.
• Automatic - refers to an action or process that is performed by a computer system (eg, software run by a computer system) or device (eg, circuit, programmable hardware elements, ASICs, etc.), without user input indicating the action or specify or perform the operation directly. Therefore, the term "automatic" is opposed to a procedure manually performed by or set by a user when the user provides the inputs to perform the operation directly. An automatic method may be initiated by inputs provided by the user, but the subsequent actions that are performed "automatically" are not determined by the user, eg, are not performed "manually" when the user sets each action, to perform this. For example, a user manually fills out the form when a user fills in an electronic form by selecting each field and providing inputs that specify information (eg, by entering information, selecting check boxes, radio buttons, etc.), even if that Computer system must update the form in response to the user actions. The form may be automatically populated by the computer system when the computer system (eg, software executing the computer system) parses the fields of the form and fills in the form without any user input specifying the responses for the fields. As indicated above, the user may interrupt the automatic completion of the form, but is not involved in the current form fill-in (eg, the user does not manually provide answers for the fields, but rather automatically completes them). The present description provides various examples of operations that are performed automatically in response to actions that the user has taken.
• PHY rate or PHY data rate - A rate at which devices communicate with each other or over a medium. Many wireless communication technologies (including IEEE 802.11) may provide for the use of different combinations of a modulation type, a coding rate, a number of spatial streams, channel widths, and / or physical layer properties. Each combination can lead to (and in some cases named as) a "PHY rate". The combination of physical layer properties resulting in a given PHY rate may also be referred to as a "modulation and coding scheme", "MCS" or "MCS index". "Lower" or "more robust" PHY rates / MCS indices may provide more efficiency to receivers to successfully receive information communicated under less than ideal medium properties as "higher" or "less robust" PHY rates ( eg using a low density modulation scheme and / or with a larger amount of error correction coding information), often at the expense of potential throughput. On the contrary, higher and lower PHY rates can provide a more efficient use of the medium and provide higher throughput than lower PHY rates (eg, by using a high density modulation scheme and / or with a low proportion of error correction coding information). but may be more difficult to receive less-than-ideal media properties.
• IEEE 802.11 - refers to a technology based on the IEEE 802.11 wireless standard, such as 802.11a, 802.11b, 802.11g, 802.11n, 802.11-2012, 802.11ac, and / or other IEEE 802.11 standards. IEEE 802.11 technology can also be referred to as "Wi-Fi" or "Wireless Local Area Network (WLAN)" technology.

Figures 1 - 2 - communication system

1 illustrates an exemplary (and simplified) wireless communication system 100 according to some embodiments. Note that the system 100 the 1 is just one example of a possible system and embodiments may be implemented in one of several systems. Note, for example, that although the exemplary wireless communication system 100 , as in 1 , is shown to include four wireless devices and aspects of the disclosure may be implemented in wireless communication systems having a higher or lower number of wireless devices (eg, any number).

As shown, the example wireless communication system includes 100 several wireless devices 102 - 108 that communicate via a transmission medium. Some or all of the wireless devices may be essentially mobile devices ("stations" or "STAs"). Alternatively or additionally, some or all of the wireless devices may be substantially stationary.

The wireless devices 102 - 108 can communicate over the wireless transmission medium in such a way as to form a wireless network. The wireless network may be an IEEE 802.11n "Infrastructure Mode" network that is accessible from an associated access point (eg, wireless device 102 ) provided; alternatively, the wireless network may be an "adhoc" or "peer-to-peer" based network. Note that it may be possible for the wireless network to include one or more "hidden nodes"; For example, as shown, the wireless device may 108 within the communication range of the wireless device 102 but it can be the wireless devices 104 and 106 not recognize (and / or be recognized by). The wireless devices 102 - 108 may be configured to perform IEEE 802.11 low power wireless communication in accordance with aspects of the present disclosure.

One or more of the wireless devices may be configured to communicate with one or more external networks. For example, as shown, the wireless device may 102 communicatively to the network 100 be coupled. The external network may be one of a variety of network types, such as a core network of a mobile operator (eg, via a cellular base station), the Internet, or an organization's intranet, under various circumstances.

Note that one or more of the wireless devices 102 - 108 may be suitable for communication using multiple wireless communication standards. For example, one or more wireless devices 102 - 108 be configured to use at least one wireless network protocol (eg, Wi-Fi) and / or at least one peer-to-peer wireless communication protocol (eg, BT, Wi-Fi peer-to-peer, etc.) and at least one wireless network protocol. Communication Protocols (eg, GSM, UMTS, LTE, LTE-Advanced (LTE-A), 3GPP2, CDMA2000 (eg, 1xRTT, ixEV-DO, HRPD, eHRPD, etc.) Some or all of the wireless devices 102 - 108 may also or alternatively be arranged to use one or more global navigation satellite systems (GNSS, eg GPS or GLONASS), one or more mobile television broadcast standards (eg ATSC-M / H or DVB-H) and / or another wireless Communication protocol, if desired, to communicate. Other communications of wireless communication standards (including more than two wireless communication standards) are also possible. Any or all of the wireless devices 102 - 108 may be arranged to perform any of the method embodiments described herein or part of any of the method embodiments described herein.

2 represents an exemplary wireless communication system 200 in which aspects of the system 100 the 1 according to a possible implementation according to some embodiments. As shown, the wireless device may 106 in the illustrated system a mobile station (STA) 106 his and the wireless device 102 can be an access point 102 (also referred to as "AP" or alternatively as "Base Station" or "BS"). The STA 106 may be a user device having Wi-Fi communication capability, such as a mobile phone, a hand-held device, a portable device, a computer or a tablet, or almost any type of wireless device. The AP 102 may be an access point device with Wi-Fi communication capability, such as a wireless router or other wireless access point.

One or both of the AP 102 and the STA 106 may include a processor configured to execute program instructions stored in a memory. One or both of the AP 102 and the STA 106 may perform any of the method embodiments described herein by executing the stored instructions. Alternatively or additionally, a programmable hardware element, such as a field programmable gate array (FPGA) configured to perform the method embodiments described herein or a portion of a method embodiment described herein may be included as part of the AP 102 and / or the STA 106 includes his.

Figure 3 - Exemplary block diagram of a wireless device

3 FIG. 4 illustrates an example block diagram of a wireless device. FIG 300 which may be adapted to be used in conjunction with various aspects of the present disclosure in accordance with some embodiments. The device 300 may be one of various types of devices and may be configured to perform one of a variety of function types. For example, the device may 300 essentially a portable device (a mobile device), such as a mobile phone, personal productivity device, computer or tablet, hand-held game console, portable media player, etc. Alternatively, the device may 300 essentially a stationary device, such as a television, subwoofer, speaker, or other audio rendering device wireless access point, a set-top box, etc., if desired.

As shown, the device can 300 a processing element 304 include. The processing element 304 may include one or more local and / or system memory elements, such as a memory 302 , include or be linked to them. The memory 302 can include one of a variety of memory types and can handle any one of a variety of functions. For example, the memory 302 a RAM acting as a system memory for the processing element 304 serves. Other storage types and function types are also possible.

The device 300 can also use a wireless communication circuit 306 include. The wireless communication circuit 306 may include analog and / or digital circuit components, or alternatively may be referred to as a "radio unit". Generally, a radio unit may include a combination of a baseband processor, an analog RF signal processing circuit (eg, including filters, mixer, oscillators or amplifiers, etc.) or digital processing circuitry (eg, for digital modulation as well as other digital processing). Likewise, the radio unit may implement one or more receive and transmit chains using the aforementioned hardware. For example, the wireless device may 300 share one or more parts of a receive and / or transmit chain between wireless communication technologies, such as those discussed above. The wireless communication circuit may include one or more antennas 308 include or be linked to them.

Note, if desired, that the wireless communication circuit 306 a separate processing element in addition to the processing element 304 may include; for example, the processing element 304 an "application processor" while the wireless communication circuit 306 may include their own "baseband processor"; alternatively (or additionally), the processing element 304 a processing capability for the wireless communication circuit 306 provide. The device 300 may be configured for communication using any of a variety of wireless communication technologies by means of the wireless communication circuit 306 and the antenna (s) 308.

The device 300 may additionally include one of a variety of other components (not shown) for implementation of the device functionality, depending on the intended functionality of the device 300 which contain additional processing and / or storage elements, one or more power supply elements (which rely on the battery power and / or an external power source), user interface elements (eg, display, speaker, microphone, camera, keyboard, mouse, touch screen, etc.) Communication elements (eg, wireless communication antenna (s), wireless communication I / O ports, communication circuits / controllers, etc.) and / or any of a variety of other components.

The component of the device 300 as the processing element 304 , the memory 302 , the wireless communication circuit 306 and the antenna (s) 308 may be operatively coupled via one or more intra-chip or inter-chip connection interfaces, which may include one of a variety of interface types, possibly including a combination of multiple interface types. As an example, a high-speed inter-chip USB (HSIC) interface can be used for inter-chip communications between the processing element 304 and the wireless communication interface 306 to be provided. Alternatively (or additionally), a Universal Asynchronous Receiver Transmitter (UART) interface, a Serial Peripheral Interface (SPI), an Inter-Integrated Circuit (I2C), a System Management Bus (SMBus), and / or one of a variety of other communication interfaces for the communications between the processing element 304 the store 302 , the wireless communication circuit 306 and / or one of a variety of other device components. Other types of interfaces (eg, peripheral interfaces for communicating with peripheral components inside or outside the device 300 etc.) can also be part of the device 300 to be provided.

As described herein, the device 300 Hardware and software components for implementing the features include performing low energy IEEE 802.11 communication, such as those described herein with reference to inter alia 4 ,

Figures 4-5 - Communication Flow Diagrams

4 FIG. 10 is a communication / signal flow diagram illustrating a scheme that may be used to perform wireless communication in a wireless communication system, such as an IEEE 802.11 wireless communication system, according to some embodiments. The scheme may be used to reduce the power consumption of devices in the wireless communication system, in particular, by allowing the devices in the system to quickly determine whether a given transmission (eg, physical layer packet) is provided for that device and the transmission length. For example, the device may drop the remaining portion of the transmission and enter a low power state (eg, sleep) for the remainder of the transmission length, in the event a device determines that it is not the destination for a transmission, thereby maximizing that of unnecessary energy consumption is avoided.

The procedure, as in 4 can be used in conjunction with any of the computer systems or devices in the above figures, among other devices. Some of the process elements shown may be performed simultaneously, in a different order than shown, or may be omitted. Additional and / or alternative process elements may also be performed as desired. As shown, the methods can work as follows.

A first wireless device 402 can be a wireless transmission 410 (a "first wireless transmission") perform. The first wireless transmission may be performed according to any of a variety of wireless communication technologies and / or standards, as desired. As a particular possibility, the first wireless transmission may be IEEE 802.11 (Wi-Fi) transmission.

The first wireless transmission 410 may include a Physical Layer (PHY) preamble and signal information, as well as PHY data. The PHY data may include encapsulated higher layer data for one of various possible networking, application, and / or other protocol stack layers, for example, depending on the communication standard (s) and / or technologies associated with the first one wireless transmission is performed.

The PHY preamble and signaling information may support carrier sensing and physical layer reception and decoding of the first wireless transmission of devices capable of receiving the first wireless transmission and may be part of one of several desired ones Features include. For example, the PHY preamble and signaling information may include portions that are coarse and / or fine for any or all of the signal / packet detection, gain control (eg, automatic gain control (AGC), coarse and / or fine frequency offset estimation and correction Time estimation, channel estimation, modulation scheme and / or coding rate information, transmission length, transmission destination (s) and / or any of various other information.

For example, in the exemplary case where the first transmission is a Wi-Fi transmission, the PHY preamble may be one or all of a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy Signal Field (L-SIG) as well as one or more high throughput (HT) and / or very high throughput (VHT) shorts training fields, long training Fields and / or signal fields ("Signal Fields"), depending on the version (eg 802.11n, 802.11ac, etc.) of the Wi-Fi transmission include.

As shown, at least a portion of the first wireless transmission 410 from a second wireless device 404 be received. In 412 may be the second wireless device 404 the intended destination of the first wireless transmission 410 determine, for example, based on the destination information included in the PHY preamble.

In 414 If the first wireless transmission is not the intended destination of the first wireless transmission (eg, as indicated by the destination information), the second wireless device may 404 drop the remaining portion of the first wireless transmission. For example, the second wireless device 404 set the receive and decode using their receive chain after determining that the first wireless transmission 410 not for the second wireless device 404 is provided and may enter for the remaining portion of the transmission 'sleep' or enter a state of low energy (eg turn off some or all radio components). The length of time during which the second wireless device 404 sleep may be determined based on the length information provided in the PHY preamble.

At least in some cases, the destination and length information may be for the first wireless transmission 410 early in the first wireless transmission 410 includes his. For example, as a possibility, again referring to the exemplary case where the first wireless transmission 410 is a Wi-Fi transmission, the destination and length information may be provided as a portion of the L-LTF.

The L-LTF can also be used for channel estimation purposes. For example, the L-LTF may include a known training sequence that may be modulated using Binary Phase Shift Keying (BPSK). Too too To include the destination and length information as a portion of the L-LTF field, additional BPSK modulation to the training sequence may be performed. The added BPSK modulation may include performing BPSK modulation on the BPSK training sequence to provide the additional information, or adding the 90 degree rotated BPSK signaling to the BPSK training sequence, among possible options.

As another example, as a possibility, again referring to the exemplary case where the first wireless transmission 410 is a Wi-Fi transmission, the destination and length information may be provided in a 'Low Energy' or 'LE-SIG' field (eg, a new field) in the first wireless transmission 410 can be included after the L-STF and before the L-LTF.

In this exemplary case, the receiving devices may not yet have performed channel estimation (e.g., based on the L-LTF) after receiving the destination and length information.

Accordingly, to enable the receiving devices to decode the destination and length information, in some cases the LE-SIG field may be differently coded. This may be in contrast to subsequent sections of the first wireless transmission 410 (eg, sections after channel estimation, as after L-LTF) that can be coded coherently.

As noted hereinabove, a device that is not the destination of the first wireless transmission 410 is scheduled to drop the remaining portion of the transmission and sleep as soon as it can determine that the transmission is not for this device. Therefore, the former destination and length information is provided for a given transmission, and the former corresponding device for which the transmission is not intended can return to a low power state and avoid further unnecessary power consumption while still being in synchronization with the wireless communication system's transmission plan remains (and thus able to wake up in time for a next transmission that may be provided to the corresponding device).

Therefore, including the destination and length information may be as early as reasonably possible in the first wireless transmission 410 lead to relatively energy-efficient operation for devices in the wireless communication system. This may be the case, in particular, as the number of devices in the wireless communication system increases, as this may be the case as the number of devices in the system increases, the ratio of transmissions not provided for each corresponding device increases can. In other words, the reduction effect of the power consumption of a technique (as described herein) that reduces power consumption in the event a device is not as a receiver of a given transmission may be proportionally more significant when the number of devices in a wireless communication system increases.

5 FIG. 10 is a communication / signal flow diagram illustrating a scheme that may be used to perform wireless communication in a wireless communication system, such as an IEEE 802.11 wireless communication system, according to some embodiments. The scheme may be used to provide early indication of the signaling / information by means of the L-LTF field or the PHY preamble. This may increase the efficiency of a receiving operation of a device, for example, by providing a timing budget for preparing the device to operate its receive blocks, eg when a pact is provided for the device.

The procedure, which in 5 can be used in conjunction with any of the computer systems or devices shown in the above figures among other devices. Some of the process elements shown may be performed simultaneously, in a different order than shown, or may be omitted. Additional process elements may also be performed as desired. As shown, the methods can work as follows.

A wireless device 502 can be a wireless transmission 510 perform (a "first wireless transmission"). The wireless transmission may be performed according to any of a variety of wireless communication technologies and / or standards, as desired. As a particular possibility, the wireless transmission may be IEEE 802.11 (Wi-Fi) transmission.

Similar to the first wireless transmission 410 the 4 can be the first wireless transmission 510 a Physical Layer (PHY) preamble and signal information as well as PHY data. The PHY data may include higher layer encapsulated data for one of several possible networking, application, and / or other protocol stack layers, for example, depending on the communication standard (s) and / or or technologies associated with the first wireless transmission.

The PHY preamble and signal information may enable carrier scanning and physical layer reception and decoding of the first wireless transmission from the devices adapted to receive the first wireless transmission, and may include portions for one of various desired functions. For example, the PHY preamble and signal information may include sections indicative of one or all of the signal / packet detection, gain control (eg Automatic Gain Control (AGC)), coarse and / or fine frequency offset estimation and correction, coarse and / or fine timing, channel estimation, modulation scheme and / or coding rate information, transmission length, transmission destination (s) and / or any of various other information. In particular, in the exemplary case where the first wireless transmission 510 A Wi-Fi transmission, the PHY preamble may include one or all of a Legacy Short Training Field (L-STF), a Legacy Long Training Field (L-LTF), a Legacy Signal Field (L-SIG), one or more Multiple High Throughput (HT) and / or Very High Throughput (VHT) Short Training Fields, Long Training Fields, and / or Signal Fields include, depending on the version (eg, 802.11n, 802.11ac, etc.) the Wi-Fi transmission.

As shown, at least a portion of the first wireless transmission 510 from the second wireless device 504 be received. In 512 may be the second wireless device 404 the control information for the first wireless transmission 510 from the L-LTF field. The control information may include one of various possible types of information according to various embodiments. As a possibility (eg as with reference to 4 noted as a possibility), the L-LTF field may include the control information indicating a destination and length of the first wireless transmission 510 indicates. As further (additional or alternative) possibilities, the L-LTF field may include control signals, the receiver operating parameters for use with the first wireless transmission 510 specify how one or all of the MIMO (s) (eg how many RF chains to use and / or single-user (SU) or multiple user (s) User ") (MU-) MIMO is used), encoding specification (s) (eg which coding type is used, such as" Binary Convolutional Coding "(BCC) or" Low-Density Parity-Check (LDPC) coding), Bandwidth specification ( n) (eg how much bandwidth for the first wireless transmission 510 Fast Fourier Transform (FFT) sizing (eg, the size of the FFT block used for the first wireless transmission 510 is used) and / or one of various other possible types of control information for the first wireless transmission 510 ,

The control information may be stored via the training sequence for the channel estimation of the L-LTF field. For example, the additional BPSK modulation on the training sequence may be performed by performing BPSK modulation on the BPSK training sequence, adding the 90 degree rotated BPSK signaling to the BPSK training sequence, etc. Accordingly, the control information may be provided by the second wireless device 504 are determined by the L-LTF field in one of several ways, eg depending on how the L-LTF field is established.

Based on the control information available in 512 is received, the second wireless device 504 (if it is the intended destination of the first wireless transmission 510 is) itself for receiving the first wireless transmission 510 set up. This may be adjusting the receiver hardware in accordance with the signaled parameters of the first wireless transmission 510 by, for example, preparing the appropriate number of antenna chains, selecting a MIMO mode, setting the bandwidth and / or FFT size, and switching to the appropriate coding block. By receiving such control information as a portion of the L-LTF field, the second wireless device may 504 be provided with a much larger timing budget to set up their various components for the proper operation than if such information is included in the later signal fields, the efficiency being significantly improved and / or higher throughput communication between the first wireless device 502 and the second wireless device 504 is enabled (and potentially between other devices in their wireless communication systems).

Note, if the second wireless device 504 not the intended destination of the first wireless transmission 510 (this may also be determined by the control information determined by the L-LTF field if the destination information is included in the L-LTF field), the second wireless device may 504 be able to drop the remaining portion of the first wireless transmission and thereby obtain energy saving benefits as previously described herein with reference to FIG 4 described.

Figures 6-19 - Exemplary 802.11 implementation details

6 - 19 and the information provided hereinbelow in connection therewith will be provided, by way of example, from various considerations and details relating to possible IEEE 802.11 wireless communication systems, in which one or both of the methods of the 4-5 can be implemented according to some embodiments and are not intended to limit the disclosure as a whole. Numerous variations and alternatives to the details provided hereinbelow are possible and should be considered to be within the scope of the disclosure.

In Wi-Fi communication systems, significant energy savings are achieved by allowing Wi-Fi devices (e.g., STAs) to sleep as much as possible. For example, a potential power save (PS) mode may include waking up an STA at predetermined intervals (e.g., Delivery Traffic Indication Message (DTIM) intervals) to 'listen in' to transmissions from the access point. If traffic is cached to the AP for the STA, the STA may remain awake until the AP has sent all of the cached data to the STA; otherwise, the STA may sleep until the next specified interval and can check the cached traffic again.

However, depending on the load on the cell, the STA may be forced to wait for a greater or lesser amount of time before the AP transmits its data (eg due to Carrier Sense Multiple Access / Collision Avoidance (CSMA / CA) nature) Protocol and time-sharing of the medium). In the meantime, the STA can (at least a portion of) listen to every transmission on the medium as it can not know when its packet will arrive.

As for 4 For example, for a STA, it may be possible to listen only to a portion of a packet, determine that the packet is not intended for the STA and drop the remaining portion of the packet and sleep until the next transmission, which is the power consumption of the STA during such waiting for a transmission to decrease. This may involve setting a "Network Allocation Vector" (NAV) to enable "Virtual Carrier Sensing". As also noted above with respect to 4 , a greater reduction in energy consumption can be achieved by prior involvement of the information required for such a capability. As for 5 Furthermore, it may generally be possible to provide any of a variety of types of control information early in an IEEE 802.11 packet by including the information in a modified (but potentially backward compatible) version of the L-LTF field. 6 - 8th illustrate possible packet structures according to different versions of the IEEE 802.11, in which different types of control information are included in different memory locations in the packet.

As in 6 For 802.11n packets, the destination information (MAC address of the destination device) is not included up to the first OFDM symbol 610 the PHY data. In the WLAN packet structure transition from 802.11n to 802.11ac, certain control information can be put into the VHT SIGi field 620 of the 802.11ac replacing the HT-SIG1 field of the 802.11n, this is also in 6 shown: the destination information (in particular, a Partial Association ID or PAID) for the packet in the VHT SIG A1 field 620 and can be decoded and used to specify the destination of the packet after the VHT SIG A2 field 630 to determine.

In the exemplary subsequent transition illustrated in FIG 6 The control information may even be included earlier in the packet, in particular as a portion of the L-LTF field 640 , Incorporating the control information at such an early storage location in the package may provide an increased timing budget for the blocks for which control information relative to the storage locations otherwise providing the information is provided. For example, as shown, the inclusion of the control information in the L-LTF 640 12-33μs or more time budget for various possible blocks of the receiver relative to alternative storage locations for the control information. It should of course be noted that these example timing budget increment values are provided by way of example only and that a number of alternative timing budget increment values are also possible.

The format of the control information contained in the L-LTF field 640 is included can be set up as desired; for example, any of various fields / sub-fields (with any of a variety of possible lengths and formats) may be defined and may be used for the control information. As an example, this can be done in 7 format shown, if desired.

As shown, the exemplary L-LTF control panel illustrated may be a destination subfield 710 include a partial destination address may include, such as the MAC address or AID address (or a portion such as the lower portion of the MAC address or AID of the destination device). The example subfield may include 6 - 11 bits of information; more bits allocated may reduce the probability of misrecognition, but require that the mechanism (eg, coding scheme) chosen to provide the additional control information be able to provide a larger number of bits of information.

In addition, the L-LTF control panel can be a length subfield 720 which includes a length value of the packet in OFDM symbols, bytes, μs, or any other metric. As one way, the length subfield may include 12 bits of information; a larger or smaller number of bits (eg with correspondingly more or less maximum field values) is also possible.

The L-LTF control panel can also be a MIMO subfield 730 which may include an indication of how many RF chains the transmission is set up for. As an option, the length subfield may include 1-2 bits of information, for example to indicate whether 1, 2, 3, or 4 RF chains are established; a larger or smaller number of bits (eg if a different number of MIMO configurations is possible) is also possible.

Further, the L-LTF control field may be a coding subfield 740 which may include an indication of which of the several possible coding types may be used for the transmission. As one option, the coding subfield may include 1 bit of information, for example to indicate whether BCC or LDPC coding is being used; a larger or smaller number of bits (eg if a different number of coding schemes is possible) is also possible.

Further, the L-LTF control panel may be a bandwidth subfield 750 which may include an indication of which of the multiple transmission bandwidths is used for the transmission. As one option, the BW subfield may contain 2 bits of information, for example to indicate whether the 20, 40, 80, or 160 MHz bandwidth is being used for the transmission; a larger or smaller number of bits (eg if a different number of bandwidths is possible) is also possible.

In addition, the L-LTF control panel may be an FFT subfield 760 which may include an indication of which of the multiple possible FFT block sizes is being used for the transmission. As an option, the FFT subfield 2 Bits of information, for example to indicate if a 64, 128 . 256 , or 512 Point FFT block is used for the transmission; a larger or smaller number of bits (eg if a different number of FFT sizes is used) is also possible.

Therefore, for the exemplary L-LTF control panel, the 7 the 24-30 information bits are used for the control signals. Note that if additional control signals are desired, it is also possible to include them (eg, depending on the coding scheme used for the L-LTF). For example, although not shown, it may also be possible to include one or all of a MU-MIMO indication, a cyclic redundancy check, and / or one of various other subfields in addition to, or as an alternative to, those described in U.S. Pat 7 included subfields as desired.

At least in some cases it may be possible to add the information to the L-LTF without turning off the backward compatibility. In other words, if configured for backward compatibility, legacy devices (eg, unable to obtain the control information from the L-LTF) may still be able to use the L-LTF field for channel estimation and time synchronization perform.

In particular, the original L-LTF field includes a known sequence of + 1s and -1s over 52 tones, which are repeated over two OFDM symbols. The inner 48 tones can be used for channel estimation, e.g. to decode the L-SIG and subsequent fields. If encoded at 1/2 rate, 24 bits of information may be available; if encoded at 3/4 rate, 36 bits of information may be available; if coded differently, 47 bits of information may be available. The repeated known sequence can generate two correlation cosets that can be used to time synchronize the OFDM symbol recognition. The two OFDM symbols of the LTF can be summed up before the channel estimation is performed, resulting, for example, in a gain of a 3dB reduction in noise.

The 8th - 10 illustrate possible techniques for incorporating the additional information into the L-LTF field in a manner that does not eliminate backward compatibility.

The 8th is a constellation diagram illustrating an example technique for adding BPSK signaling to the existing L-LTF BPSK signaling system. Training sequence represents. The resulting constellation diagram appears to be similar to a 2-bit Pulse Amplitude Modulation (4 PAM) scheme; however, such a scheme can actually add 48 coded bits to the L-LTF, since one of the bits is actually determined by the known training sequence. Note that all unity power points can be scaled; the value of ε can be as desired; as an example, he will be in 8th represented as ε = 1/2.

• Ĥ =(y₁ + y₂)/2 × X_t* = H + n,
• wobei die Rauschenergie n -(SNR + 3) dB ist,
• |X_t|²= 1, und
• ()* komplex konjugiert bezeichnet.

As noted previously, channel estimation may be performed on each tone by adding the two L-LTF OFDM symbols (which may alternatively be referred to as L-LTF subfields). If the two L-LTF subfields are as in 9 may be formulated (eg, where L-LTFi has 910 x1 = Xt + ε while L-LTF2 has 920 x2 = Xt -ε), the additional information may be deleted to obtain the term H of the training sequence for each tone (estimated, eg due to the noise, as indicated by the roof):

• Ĥ = (y ₁ + y ₂ ) / 2 × X _t * = H + n,
• where the noise energy is n - (SNR + 3) dB,
• | X _t | ² = 1, and
• () * called complex conjugated.

Therefore, the legacy devices that perform the channel estimation by summing up the two L-LTF subfields 910 . 920 perform, still be able to recognize the familiar training sequence.

wobei die Rauschenergie n -(SNR + 3) dB ist.On the other hand, the additional information about each tone can be obtained by subtracting the two L-LTF subfields 910 . 920 be recognized. For this calculation, the original term for the training sequence Xt can be deleted and only the additional information ε can be retained (with some noise): $$\widehat{\epsilon }=\left({\text{y}}_1-{\text{y}}_2\right)/2=\epsilon +\text{n}.$$

where the noise energy is n - (SNR + 3) dB.

10 Figure 13 is a constellation diagram illustrating an example technique for adding 90 degree rotated BPSK signaling over the existing L-LTF BPSK training sequence. In this case, the real parts of the constellation (eg, +1 or -1) may be used for the original (known) training sequence, whereas the imaginary parts of the constellation (eg, + j or -j) may provide the additional information bits.

11 - 13 are diagrams that provide different test results for the schemes for incorporating the additional information as in the 8th - 10 represented represent.

The 11 illustrates an exemplary packet error rate (PER) capability for the different conditional length schemes for a fading channel. As shown, both schemes (overlaid BPSK 1110 . 1130 and twisted BPSK 1120 . 1140 ) performs well, especially with a conditional length of 7 (Kcc = 7). Note that the superimposed BPSK schemes 1110 . 1130 a 3 dB penalty relative to the rotated BPSK schemes 1120 . 1140 show, eg due to a shortened free distance d _free .

The 12A-12D show the results of the timing timing offset (STO) for the original L-LTF operation 1210 , for the added BPSK operation 1220 and for the added 90-degree BPSK operation 1230 at different Singalpegeln. In particular, the 12A a cross-correlation at 0 dB, the 12B a cross correlation at 2 dB, the 12C a cross correlation at 4 dB and the 12D cross-correlation at 6 dB. As can be seen, the power between the different operations is very similar. The added 90 degree twisted BPSK 1230 seems to show a slight decrease in performance (higher noise level) but the difference seems to be marginal.

The 13 represents the exemplary performance of the channel estimation for the original L-LTF process 1310 , for the added BPSK operation 1320 and for the added 90-degree BPSK operation 1330 In particular, the accuracy of the channel estimation is represented in terms of mean square error (MSE) in dB as a function of a ratio of the received signal and the noise (SNR) in dB.

During the added 90 degree rotated BPSK scheme 1330 a similar performance to the original L-LTF scheme 1310 shows as shown shows the added BPSK scheme 1320 an error level resulting from the uniform energy scale of the 4 PAM constellation. It may be possible to increase the error level for the added BPSK scheme 1320 by reducing the value of ε (eg decreasing), however, this may result in a deterioration of the PER for this scheme.

Therefore, for a device adapted to recognize the information, it may be possible to prepare it Start receiving components according to the particular parameters of a packet in an earlier portion of the packet for which it is the intended receiver by transferring the control information to the L-LTF field using the BPSK or the 90 degree rotated BPSK to the existing one BPSK training sequence is added, or alternatively possible to drop packets for which the device is not the intended receiver, whereby Energieeinsparrungen be realized. Further, the two legacy devices and the new devices may be able to use the L-LTF field for channel estimation and time synchronization as originally envisioned for the use of the schemes.

As before regarding 4 noted as an alternative to providing the destination and length information as a section of the L-LTF field, it may also be possible to define a new field, for example, for inclusion between the L-STF and the L-LTF, in which the destination and length information is provided. The 14 - 15 illustrate how a packet structure that includes the field differs from an 802.11ac packet structure according to some embodiments. As shown, the 14 an exemplary IEEE 802.11ac physical layer packet structure that includes the PHY preamble and the PHY data, similar to that in FIG 6 presented 802.11ac packet structure. As shown, the preamble may include various very high throughput (VHT) short training fields, long training fields, and signal fields, each of which has a fixed length and may be of a very high throughput (FIG. "Very High Throughput" (VHT) data field (eg the PHY data), possibly having a variable length.

In the in the 14 As shown in the exemplary IEEE 802.11ac physical layer packet structure, the destination information (in particular, a partial association ID or PAID) may be provided for the packet in the VHT SIG A1 field and may be decoded and used. to determine the destination of the packet after receiving the VHT SIG A2 field. Therefore, (eg, in conjunction with the length information provided in the L-SIG field), a device that decodes a packet and determines that it is not the intended recipient of the packet may be able to drop and drop the remaining portion of the packet sleep, after an initial time, eg 28μs, for the length of time the remaining part is being transferred.

The 15 FIG. 10 illustrates an exemplary new IEEE 802.11 physical layer packet structure that includes a new low energy 'or' LE-SIG 'field between the L-STF and the L-LTF. The L-SIG field may include the destination and length information for the packet, and therefore may allow a receiving device that is not the intended recipient of the packet to drop the remaining portion of the packet and for the length of time that the packet is being transmitted to sleep after the L-SIG field. If the LE-SIG field is 4μs, this would mean that a receiving device could sleep after only 12μs, while if the LE-SIG field is 8μ, that would mean that a receiving device could sleep after only 16μs. This would represent about 57% (12/28) or 43% (16/28) energy savings compared to the in 14 shown packet structure was used.

The L-STF can handle some functions, including one or all of the beginning of packet detection, AGC, gain control (eg Automatic Gain Control (AGC)), coarse frequency offset estimation and correction, coarse timing estimation. At least in some cases, the L-STF for a receiving device may be insufficient to perform the channel estimation (which may be performed using / based on the L-LTF); accordingly, the LE-SIG may be differently coded to include the destination and length information in the LE-SIG and the LE-SIG may be provided between the L-STF and the L-LTF, as in FIG 15 shown with reasonable expectation of usability by the receiving devices. For example, the information in the transitions may be encoded from one sample to the next, rather than in the sample itself (ie, coherent encoding).

As noted previously, the LE-SIG may include the destination and length information for the packet. The format of the LE-SIG can be created as desired; For example, any format and field length may be used for the destination information and the length information. As a possibility, the LE-SIG 23 Information bits include (and 24 in total, since the first bit may be a reference bit for the different coding) of which 9 bits may indicate the PAID of the destination address (or another compressed format such as a partial MAC address or group ID), 11 bits may indicate the length of the packet in the OFDM symbols and 3 bits may indicate the cyclic redundancy check information. The format can support approximately 1000 STAs per Basic Service Set (BSS) and a maximum packet length of 5.46ms. In this case, a different number of information bits (total and / or per field), different field formats (eg a different destination address format, a length measurement in bytes, μs, or another metric, including or not including a confirmation, etc. as desired) , Inclusion additional information, and / or other deviations in the LE-SIG field may be used as desired.

The LE-SIG may be set up to use or not to use the encoding as desired and to be repeated a number of times as desired (e.g., for time diversity, noise reduction, etc.). For example, the modulated symbols may be repeated four times without coding over an 8μs interval, or may be repeated twice with r = ½ over an 8μs interval. Further, the LE-SIG field may be transmitted to one of various possible PHY data rates, as desired. For example, a 6Mbps data rate may be used for an OFDM symbol duration (4μs), or a 3Mbps data rate may be used for two OFDM symbol durations (8μs).

Since the LE-SIG may encode the information differently, a device adapted to use the LE-SIG may include a Differential Demapper Functional Block (eg, as part of its radio units) , The 16 FIG. 12 illustrates an exemplary receiver block diagram that includes a differential demapper block and that may be used to decode a differently coded LE-SIG field according to different possible implementations.

As shown, the receiver may include a "Radio Frequency" (RF) circuit that can receive signals from an antenna and transmit (eg, filter, amplify, and / or otherwise modify) signals to an analog-to-digital converter converter (A / D), which in turn can convert the analog signals into digital signals and provide them to a digital front-end circuit. Based on the L-STF field of an incoming signal, the receiver may be able to perform Carrier Sensing (CRS) to detect incoming packets and may also set up automatic gain control (AGC) and frequency offset Estimation and correction for each detected incoming packet (eg, based on a control signal from the carrier sampling block that may be provided based on incoming packet detection).

After the Fast Fourier Transformation (FFT) placement and FFT (which can use the FFT input and FFT output buffers), the incoming signals may be sent to a channel estimation block, a demapper block or an LE-SIG symbol. Combiner block can be spread, eg depending on which section of a transmission arrives at a certain time. As shown, incoming signals may also be provided to a data path control block, which may analyze the signals to determine which data path is to be activated. For example, a data path controller may be capable of determining whether the second field of an incoming packet is an LE-SIG or an L-LTF field; and enable the data path for the LE-SIG symbol combiner and differential demapper or the channel estimation block.

Therefore, if the second field is an LE-SIG field, the signals of the LE-SIG field may be provided to the LE-SIG symbol combiner (eg, as they may be repeated to obtain the noise reduction benefits) and thus to the differential demapper. Alternatively (eg, if the LE-SIG signals are not repeated), no LE-SIG symbol combiner block can be used and the LE-SIG data path can provide signals from the FFT block directly to the differential demapper. The differential demapper block may determine the value of each bit (tone) based on the difference relative to the previous tone; for example, if a sound is rotated from the previous sound, which may indicate a '1', whereas if a sound is the same sound as the previous sound, this may indicate a '0'. If the LE-SIG uses the coding (eg r = ½ coding), the Viterbi block can also be used as part of the decoding of the LE-SIG, after which the CRC _LE can be checked to verify that the LE- SIG SIG was properly decoded. Alternatively, if the LE-SIG is uncoded, the data path from the differential demapper can go directly to the CRC _LE check.

If the receiver is the intended receiver for the packet, then the channel estimation based on the L-LTF field can be performed using the channel estimation block, followed by the L-SIG field and subsequent fields (which can be coded coherently) ) can be decoded using the coherent detection in which the demapper and Viterbi blocks are decoded.

As noted above, the data path controller may identify which preamble type is being received (e.g., legacy or LE) and switch the data path accordingly. For the LE preambles, the data path controller may also check the destination and length information in the LE-SIG to determine whether to proceed with the packet or drop it. The identification of the preamble type may be performed in any of various ways as desired; as an option, the L-LTF frame structure can be used to quickly recognize whether or not a field (e.g., the second field of the PHY preamble) is the L-LTF.

For example, as in the 17 an L-LTF may include a cyclic prefix within the first 0.8μs of the field and may repeat the cyclic prefix within the second 0.8μs of the field. In contrast, a LE-SIG field may include a single cyclic prefix before each of the LE-SIGi and LE-SIG2 sections of the field. Therefore, following the L-STF, the data path controller can assemble a 0.8μs sample and perform auto-correlation. If there is a peak in the next 0.8μs, this may indicate that the field is an L-LTF field (and that the preamble of the incoming packet is a legacy preamble), whereas if not, it may indicate that the field is an LE-SIG field (and that the preamble of the incoming packet is an LE preamble). Therefore, the classification can be done within 1.6μs after the L-STF field.

The 18 FIG. 10 is a flowchart illustrating an example process flow for the PS operation of a device configured to use a packet structure including a LE-SIG field as described herein.

As shown, in 1802 the device can actively search for incoming transmissions. Upon detecting an incoming packet (detecting an L-STF) in 1804, the device may identify the second field in 1806. Specifically, in 1808, it may be determined whether the second field is an L-LTF field (eg, if the incoming packet is a legacy packet) or a LE-SIG field (eg, if the incoming packet has the packet structure that is in 15 is shown and described with respect to these).

A mechanism for identifying the second field may simply try the second field as an L-LTF (eg, determining whether the incoming signal matches the expected training sequence), as well as an LE-SIG (eg, determining if the CRC value for that of the LE-SIG would be correct) is to decode, for example, using multiple blocks of the corresponding chain at the same time (eg parallel).

Alternatively, as shown, data path control (as previously described herein with respect to FIGS 16 - 17 ) can be used for the early identification of the second field. The data path controller may perform a time-domain correlator (eg, in associated hardware) after the L-STF on the repeated cyclic prefix, which may be present in a legacy preamble, to determine the identity of the second field before or at the beginning of the second field.

If the second field is an LE-SIG field, then in 1810 the receiving path for the differential demapper to be activated. In 1812 the CRC for the LE-SIG (CRC _LE ) can be checked. If the CRC _{LE is} successful, in 1814 the destination address (DA) and the length of the packet are checked. Assume that the DA is not the one of the device that controls the flow of the process 18 implemented, the device can in 1816 and 1818 Set a timer and sleep for the length of the package. If the DA is that of the device that controls the process flow of the device 18 implemented, the device of the step 1814 to the step 1822 continue to proceed with decoding the remainder of the package.

If in step 1812 the CRC _LE fails, this may be a result of poor reception conditions (or possibly it may result if the packet is a legacy packet and the second packet is actually an L-LTF field). As one way (and as shown), the device may be in step 1818 continue and simply drop the remaining portion of the packet and sleep for a period of time (eg, for a random or pseudo-random time to a beacon, or for another desired interval) after which the device can wake up and on step 1802 can return to actively search for incoming data packets again. As another option (not shown), the device may attempt to continue to receive the packets (eg, performing channel estimation on the L-LTF field and decoding subsequent fields) at least until the next destination address and packet length indication is received.

If in step 1808 it is determined that the packet includes a legacy preamble and the second field is an L-LTF field, the device may follow the right side of the illustrated process flow. Continuing with the step 1820 in this case, the device can activate the path for channel estimation, then in 1822 For example, the device may process the L-SIG and the rest of the packet (at least until an indication of the destination address and packet length is received). If the packet is not intended for the device (as soon as it is detected), the device may drop the packet and sleep for the remainder of the packet duration; if the package is intended for the device, the device may be in 1824 check the CRC _data at the end of the package and if successful in 1826 send a confirmation. If the CRC _data fails, the device may instead step 1828 continue and sleep for a period of time (eg, for a random or pseudo-random time period, until the next signal, or for another desired interval) after which the device can wake up and to step 1802 can return to actively search for incoming packets again.

19 FIG. 10 is a flow chart illustrating an example process flow for operation of a legacy device that is not configured to use a packet structure that includes a LE-SIG field as described herein.

As shown, the device in 1902 actively search for incoming transmissions. After detecting an incoming packet (detecting an L-STF) in 1904 , the device can in 1906 try to decode the second field as an L-LTF. If the incoming packet is a legacy packet (in which case the second field may indeed be an L-LTF), the device may be successful in decoding the L-LTF and may then be capable of the L-SIG and the remainder Section of the package in 1908 to process. The device may therefore continue to process the packet at least until an indication of the destination address and the packet length is received. If the package is not intended for the device, the device may drop it and sleep for the remainder of the package as soon as it is detected; if the package is intended for the device, the device may be in 1910 check the CRC _data at the end of the package and if successful in 1912 send a confirmation. If the CRC _data fails, the device may instead go to step 1914 continue to sleep and sleep for a period of time (eg, for a random or pseudo-random time period, until the next signal or other desired interval) after which the device can wake up and step 1902 can continue to actively search for incoming data packets again.

If the incoming packet is not a legacy packet (in which case the second field may be a LE-SIG field), the device may be in 1906 fail to decode the L-LTF. In this case, the device may sleep (eg, for a random or pseudo-random time period, until the next signal or other desired interval) and may wake up to actively search for incoming packets again or immediately to step 1902 return for an active search for incoming packets. Therefore, using a packet structure with a LE-SIG field as described herein can provide backward compatibility with legacy devices, at least in some cases.

1. 1. Ein Verfahren, aufweisend: Empfangen, durch eine drahtlose Vorrichtung, einer drahtlosen Übertragung, wobei die drahtlose Übertragung eine Physical Layer (PHY)-Präambel und PHY-Daten aufweist; wobei die PHY-Präambel eine Zielortinformation aufweist, die einen Zielort angibt und eine Längeninformation aufweist, die eine Länge der drahtlosen Übertragung angibt, wobei die PHY-Präambel einen Abschnitt aufweist, der für eine Kanalschätzung eingerichtet ist; wobei die Zielortinformation und die Längeninformation in dem Abschnitt der PHY-Präambel umfasst sind, der für die Kanalschätzung eingerichtet ist; Bestimmen, durch die drahtlose Vorrichtung, ob die drahtlose Übertragung für die drahtlose Vorrichtung vorgesehen ist basierend auf der Zielortinformation; und Fallenlassen, durch die drahtlose Vorrichtung, des restlichen Abschnitts der ersten drahtlosen Übertragung, falls die Zielortinformation angibt, dass die drahtlose Übertragung nicht für die drahtlose Vorrichtung vorgesehen ist.
2. 2. Das Verfahren nach Beispiel 1, wobei die Zielortinformation und die Längeninformation durch Hinzufügen einer BPSK-Signalisierung kodiert werden, die die Zielortinformation und die Längeninformation auf einer BPSK-Trainingssequenz trägt, wobei die hinzugefügte BPSK-Signalisierung durch Hinzufügen der BPSK-Signalisierung auf die BPSK-Trainingssequenz; oder durch Hinzufügen eine um eine 90 Grad gedrehten („90 degree rotated“) BPSK-Signalisierung auf die BPSK-Trainingssequenz hinzugefügt wird.
3. 3. Das Verfahren nach einem der Beispiele 1-2, wobei die drahtlose Übertragung eine IEEE 802.11-drahtlose Kommunikation ist; wobei die PHY-Präambel mindestens ein Legacy Short Training Field und ein Legacy Long Training Field aufweist; wobei die Zielortinformation und die Längeninformation Teil des Legacy Long Training Field sind.
4. 4. Das Verfahren nach einem der Beispiele 1-3, wobei das Fallenlassen, durch die drahtlose Vorrichtung, des restlichen Abschnitts der drahtlosen Übertragung das Schlafen oder Betreten eines Zustands niedriger Energie für die Länge der drahtlosen Übertragung basierend auf der Längeninformation aufweist.
5. 5. Ein Verfahren, aufweisend: Durchführen, durch eine erste drahtlose Vorrichtung, einer ersten drahtlosen Übertragung, wobei die erste drahtlose Übertragung eine Physical Layer (PHY)-Präambel und PHY-Daten aufweist, wobei die PHY-Präambel eine Zielortinformation aufweist, die eine Vorrichtung angibt für die die erste drahtlose Übertragung vorgesehen ist und eine Längeninformation aufweist, die eine Länge der ersten drahtlosen Übertragung angibt, wobei die PHY-Präambel einen Abschnitt aufweist, der für eine Kanalschätzung eingerichtet ist; wobei die Zielortinformation und die Längeninformation in dem Abschnitt der PHY-Präambel umfasst sind, der für die Kanalschätzung eingerichtet ist; Empfangen, durch eine zweite drahtlose Vorrichtung, von mindestens einem Abschnitt der ersten drahtlosen Übertragung; und falls die Zielortinformation angibt, dass die erste drahtlose Übertragung nicht für die zweite drahtlose Vorrichtung vorgesehen ist: Bestimmen, durch die zweite drahtlose Vorrichtung, dass die erste drahtlose Übertragung nicht für die zweite drahtlose Vorrichtung vorgesehen ist basierend auf der Zielortinformation; und Fallenlassen, durch die zweite drahtlose Vorrichtung, des restlichen Abschnitts der ersten drahtlosen Übertragung.
6. 6. Das Verfahren nach Beispiel 5, wobei die Zielortinformation und die Längeninformation durch Hinzufügen einer BPSK-Signalisierung kodiert werden, die die Zielortinformation und die Längeninformation auf einer BPSK-Trainingssequenz trägt, wobei die hinzugefügte BPSK-Signalisierung durch: Hinzufügen der BPSK-Signalisierung auf die BPSK-Trainingssequenz; oder durch Hinzufügen einer um 90-Grad gedrehten („90 degree rotated“) BPSK-Signalisierung auf die BPSK-Trainingssequenz hinzugefügt wird.
7. 7. Das Verfahren nach einem der Beispiele 5-6, wobei die erste drahtlose Übertragung eine IEEE 802.11-drahtlose Kommunikation ist; wobei die PHY-Präambel mindestens ein Legacy Short Training Field und ein Legacy Long Training Field aufweist; wobei die Zielortinformation und die Längeninformation Teil des Legacy Long Training Field sind.
8. 8. Das Verfahren nach einem der Beispiele 5 - 7, wobei das Fallenlassen, durch die zweite drahtlose Vorrichtung, des restlichen Abschnitts der ersten drahtlosen Übertragung das Schlafen oder Betreten eines Zustands niedriger Energie für die Länge der ersten drahtlosen Übertragung basierend auf der Längeninformation aufweist.
9. 9. Ein Verfahren: Empfangen, durch eine drahtlose Vorrichtung, einer drahtlosen Übertragung, wobei die drahtlose Übertragung eine Physical Layer (PHY)-Präambel und PHY-Daten aufweist; wobei die PHY-Präambel eine Zielortinformation aufweist, die einen Zielort angibt und eine Längeninformation, die eine Länge der drahtlosen Übertragung angibt; wobei die PHY-Präambel einen Abschnitt aufweist, der für eine Kanalschätzung eingerichtet ist, wobei die Zielortinformation und die Längeninformation vor dem Abschnitt der PHY-Präambel eingerichtet sind, die für die Kanalschätzung eingerichtet ist; Bestimmen, durch die drahtlose Vorrichtung, ob die Zielortinformation angibt, dass die drahtlose Übertragung für die drahtlose Vorrichtung vorgesehen ist; Fallenlassen, durch die drahtlose Vorrichtung, des restlichen Abschnitts der drahtlosen Übertragung, falls die Zielortinformation angibt, dass die drahtlose Übertragung nicht für die drahtlose Vorrichtung vorgesehen ist.
10. 10. Das Verfahren nach Beispiel 9, wobei die Zielortinformation und die Längeninformation unterschiedlich kodiert werden; wobei die Abschnitte der drahtlosen Übertragung nach dem Abschnitt, der für die Kanalschätzung eingerichtet ist, kohärent kodiert werden.
11. 11. Das Verfahren nach einem der Beispiele 9 - 10, wobei die drahtlose Übertragung eine IEEE 802.11-drahtlose Kommunikation ist; wobei die PHY-Präambel mindestens ein Legacy Short Training Field und ein Legacy Long Training Field aufweist; wobei die Zielortinformation und die Längeninformation nach dem Legacy Short Training Field und vor dem Legacy Long Training Field bereitgestellt werden.
12. 12. Das Verfahren nach einem der Beispiele 9 - 11, wobei das Fallenlassen, durch die zweite drahtlose Vorrichtung, des restlichen Abschnitts der ersten drahtlosen Übertragung das Schlafen oder Betreten eines Zustands niedriger Energie für die Länge der ersten drahtlosen Übertragung basierend auf der Längeninformation aufweist.
13. 13. Ein Verfahren, aufweisend: Durchführen, durch eine erste drahtlose Vorrichtung, einer ersten drahtlosen Übertragung, wobei die erste drahtlose Übertragung eine Physical Layer (PHY)-Präambel und PHY-Daten aufweist, wobei die PHY-Präambel eine Zielortinformation aufweist, die eine Vorrichtung angibt für die die erste drahtlose Vorrichtung vorgesehen ist und eine Längeninformation aufweist, die eine Länge der ersten drahtlosen Übertragung angibt, wobei die PHY-Präambel einen Abschnitt aufweist, der für eine Kanalschätzung eingerichtet ist; wobei die Zielortinformation und die Längeninformation vor dem Abschnitt der PHY-Präambel eingerichtet sind, der für die Kanalschätzung eingerichtet ist; Empfangen, durch eine zweite drahtlose Vorrichtung, von mindestens einem Abschnitt der ersten drahtlosen Übertragung; und falls die Zielortinformation angibt, dass die erste drahtlose Übertragung nicht für die zweite drahtlose Vorrichtung vorgesehen ist: Bestimmen, durch die zweite drahtlose Vorrichtung, dass die erste drahtlose Übertragung nicht für die zweite drahtlose Vorrichtung vorgesehen ist basierend auf der Zielortinformation; und Fallenlassen, durch die zweite drahtlose Vorrichtung, des restlichen Abschnitts der ersten drahtlosen Übertragung.
14. 14. Ein Verfahren, aufweisend: durch eine drahtlose Vorrichtung: Empfangen einer drahtlosen Übertragung, wobei die drahtlose Übertragung eine Physical Layer (PHY)-Präambel und PHY-Daten aufweist, wobei die PHY-Präambel eine Zielortinformation aufweist, die einen Zielort angibt und eine Längeninformation, die eine Länge der drahtlosen Übertragung angibt; Bestimmen, ob die drahtlose Übertragung für die drahtlose Vorrichtung vorgesehen ist basierend auf der Zielortinformation; Fallenlassen eines restlichen Abschnitts der drahtlosen Übertragung, falls die drahtlose Übertragung nicht für die drahtlose Vorrichtung vorgesehen ist.
15. 15. Das Verfahren nach Beispiel 14, wobei die PHY-Präambel einen Abschnitt aufweist, der für eine Kanalschätzung eingerichtet ist, wobei die Zielortinformation und die Längeninformation vor dem Abschnitt der PHY-Präambel eingerichtet sind, der für die Kanalschätzung eingerichtet ist.
16. 16. Das Verfahren nach Beispiel 14, wobei die Zielortinformation und die Längeninformation unterschiedlich kodiert werden; wobei die Abschnitte der drahtlosen Übertragung nach dem Abschnitt, der für die Kanalschätzung eingerichtet ist, kohärent kodiert werden.
17. 17. Das Verfahren nach einem der Beispiele 14 - 16, wobei die drahtlose Übertragung eine IEEE 802.11-drahtlose Kommunikation ist; wobei die PHY-Präambel mindestens ein Legacy Short Training Field und ein Legacy Long Training Field aufweist; wobei die Zielortinformation und die Längeninformation nach dem Legacy Short Training Field und vor dem Legacy Long Training Field bereitgestellt werden.
18. 18. Das Verfahren nach einem der Beispiele 14 - 17, wobei das Fallenlassen des restlichen Abschnitts der ersten drahtlosen Übertragung das Schlafen oder Betreten eines Zustands niedriger Energie für die Länge der ersten drahtlosen Übertragung basierend auf der Längeninformation aufweist.
19. 19. Das Verfahren nach einem der Beispiele 14 - 18, wobei die Zielortinformation irgendein ausgewählter einer partial Media Access Control (MAC)-Adresse der Zielvorrichtung oder einer Partial Association ID (PAID) der Zielvorrichtung aufweist.
20. 20. Das Verfahren nach einem der Beispiele 14 - 19, wobei die Längeninformation eine Länge der drahtlosen Übertragung irgendein ausgewählter von Bytes oder von OFDM-Symbolen angibt.
21. 21. Das Verfahren nach einem der Beispiele 14 - 16 oder 18 - 19, wobei die drahtlose Übertragung eine IEEE 802.11-drahtlose Kommunikation ist, wobei die PHY-Präambel mindestens ein Legacy Short Training Field und ein Legacy Long Training Field aufweist, wobei die Zielortinformation und die Längeninformation Teil des Legacy Long Training Field sind.
22. 22. Das Verfahren nach einem der Beispiele 14 - 21, wobei die Zielortinformation und die Längeninformation in einem unterschiedlich kodierten Feld der PHY-Präambel enthalten sind, wobei die OFDM-Symbole der Zielortinformation und der Längeninformation in dem unterschiedlich kodierten Feld zumindest zweimal widerholt werden innerhalb des unterschiedlich kodierten Felds.
23. 23. Das Verfahren nach einem der Beispiele 14 - 22, weiterhin aufweisend:
    • Bestimmen, ob ein Feld der PHY-Präambel nach dem Legacy Short Training Field ein Legacy Long Training Field oder ein Signalfeld niedriger Energie ist, das die Zielortinformation und die Längeninformation aufweist.
24. 24. Das Verfahren nach Beispiel 23, wobei das Bestimmen, ob das Feld der PHY-Präambel nach dem Legacy Short Training Field ein Legacy Long Training Field oder ein Signalfeld niedriger Energie ist weiterhin aufweist: Zusammentragen von Abtastungen für erste 0,8µs des Felds nach dem Legacy Short Training Field; Durchführen einer Auto-Korrelation der ersten 0,8µs mit nächsten 0,8µs des Felds nach dem Legacy Short Training Field; Bestimmen, dass das Feld nach dem Legacy Short Training Field ein Legacy Long Training Field ist, falls die Auto-Korrelation zu einem Höchstpunkt führt; und Bestimmen, dass das Feld nach dem Legacy Short Training Field ein Signalfeld niedriger Energie ist, falls die Auto-Korrelation nicht zu einem Höchstpunkt führt.
25. 25. Ein Verfahren, aufweisend: durch eine erste drahtlose Vorrichtung: Erzeugen eines Signals für eine drahtlose Übertragung, wobei das Signal eine Physical Layer (PHY)-Präambel und PHY-Daten aufweist, wobei die PHY-Präambel eine Zielortinformation aufweist, die einen Vorrichtung angibt, die für die drahtlose Übertragung vorgesehen ist, und eine Längeninformation, die eine Länge der drahtlosen Übertragung angibt; wobei die PHY-Präambel einen Abschnitt aufweist, der für eine Kanalschätzung eingerichtet ist, wobei die Zielortinformation und die Längeninformation vor dem Abschnitt der PHY-Präambel, der für die Kanalschätzung eingerichtet ist, eingerichtet sind oder in diesem enthalten sind; und drahtlose Übertragung des Signals.
26. 26. Das Verfahren nach Beispiel 25, wobei die Zielortinformation und die Längeninformation vor dem Abschnitt der PHY-Präambel, die für die Kanalschätzung eingerichtet ist, eingerichtet sind und unterschiedlich kodiert werden, wobei die Abschnitte des Signals nach dem Abschnitt, der für die Kanalschätzung eingerichtet ist, kohärent kodiert werden.
27. 27. Das Verfahren nach einem der Beispiele 25 - 26, wobei die Zielortinformation eine Partial Association ID (PAID) der Zielvorrichtung aufweist.
28. 28. Das Verfahren nach einem der Beispiele 25 - 27, wobei das Signal ein IEEE 802.11-drahtloses Kommunikationssignal ist; wobei die PHY-Präambel mindestens ein Legacy Short Training Field und ein Legacy Long Training Field aufweist, wobei die Zielortinformation und die Längeninformation nach dem Legacy Short Training Field und vor dem Legacy Long Training Field bereitgestellt werden.
29. 29. Das Verfahren nach einem der Beispiele 25 - 27, wobei das Signal ein IEEE 802.11-drahtloses Kommunikationssignal ist; wobei die PHY-Präambel mindestens ein Legacy Short Training Field und ein Legacy Long Training Field aufweist, wobei die Zielortinformation und die Längeninformation als Teil des Legacy Long Training Field bereitgestellt werden.
30. 30. Ein Verfahren, aufweisend: durch eine drahtlose Vorrichtung: Empfangen einer drahtlosen Übertragung, wobei die drahtlose Übertragung eine Physical Layer (PHY)-Präambel und PHY-Daten aufweist, wobei die PHY-Präambel ein Legacy Long Training Field (L-LTF) aufweist, wobei das L-LTF eine Steuerungsinformation für die drahtlose Übertragung aufweist; Bestimmen der Steuerungsinformation von dem L-LTF-Feld; und Einrichten von Empfangsparametern für die drahtlose Übertragung basierend auf der Steuerungsinformation.
31. 31. Das Verfahren nach Beispiel 30, wobei das L-LTF eine BPSK-Trainingssequenz aufweist, die für eine Kanalschätzung eingerichtet ist, wobei die Steuerungsinformation durch Hinzufügen der BPSK-Signalisierung auf die BPSK-Trainingssequenz kodiert wird.
32. 32. Das Verfahren nach Beispiel 31, wobei die Steuerungsinformation durch Hinzufügen der BPSK-Signalisierung auf die BPSK-Trainingssequenz kodiert wird.
33. 33. Das Verfahren nach Beispiel 31, wobei die Steuerungsinformation durch Hinzufügen einer um 90 Grad gedrehten („90 degree rotated“) BPSK-Signalisierung auf die BPSK-Trainingssequenz kodiert wird.
34. 34. Das Verfahren nach einem der Beispiele 30 - 33, wobei die Steuerungsinformation eine Zielort- und Längeninformation für die drahtlose Übertragung aufweist.
35. 35. Das Verfahren nach einem der Beispiele 30 - 34, wobei die Steuerungsinformation eine MIMO-Konfigurationsinformation für die drahtlose Übertragung aufweist.
36. 36. Das Verfahren nach einem der Beispiele 30 - 35, wobei die Steuerungsinformation eine Angabe aufweist, ob die drahtlose Übertragung Mehrfach-Anwender („multi user“)-MIMO oder Einfach-Anwender („single user“)-MIMO verwendet.
37. 37. Das Verfahren nach einem der Beispiele 30 - 36, wobei die Steuerungsinformation eine Angabe über einen Kodierungstyp aufweist, der für die drahtlose Übertragung verwendet wird.
38. 38. Das Verfahren nach einem der Beispiele 30 - 37, wobei die Steuerungsinformation eine Angabe über eine Bandbreite der drahtlosen Übertragung aufweist.
39. 39. Das Verfahren nach einem der Beispiele 30 - 38, wobei die Steuerungsinformation eine Angabe über die Größe eines Fast Fourier Transform-Blocks aufweist, der für die drahtlose Übertragung verwendet wird.
40. 40. Ein Verfahren, aufweisend: durch eine erste drahtlose Vorrichtung: Erzeugen eines Signals für eine drahtlose Übertragung, wobei das Signal eine Physical Layer (PHY)-Präambel und PHY-Daten aufweist, wobei die PHY-Präambel eine Trainingssequenz aufweist, die von der drahtlosen Vorrichtung für eine Kanalschätzung eingerichtet ist, wobei das Feld weiterhin eine Steuerungsinformation aufweist, die zum Bereitstellen von Empfangsparametern für die drahtlose Übertragung eingerichtet ist; und drahtlose Übertragung des Signals.
41. 41. Das Verfahren nach Beispiel 40, wobei das Signal ein IEEE 802.11-drahtloses Kommunikationssignal ist, wobei das Feld ein Legacy Long Training Field (L-LTF) der PHY-Präambel des IEEE 802.11-drahtlosen Kommunikationssignals aufweist.
42. 42. Das Verfahren nach einem der Beispiele 40 - 41, wobei die Steuerungsinformation durch Hinzufügen der BPSK-Signalisierung, die die Zielortinformation und die Längeninformation trägt, auf die BPSK-Trainingssequenz kodiert wird, wobei die hinzugefügte BPSK-Signalisierung hinzugefügt wird durch: Hinzufügen der BPSK-Signalisierung auf die BPSK-Trainingssequenz; oder Hinzufügen einer um 90 Grad gedrehten („90 degree rotated“)-BPSK-Signalisierung auf die BPSK-Trainingssequenz.
43. 43. Das Verfahren nach einem der Beispiele 40 - 42, wobei die Steuerungsinformation eine Zielortinformation aufweist, die eine Vorrichtung angibt für die die drahtlose Übertragung vorgesehen ist, und eine Längeninformation, die eine Länge der drahtlosen Übertragung angibt.
44. 44. Das Verfahren nach Beispiel 43, wobei die Zielortinformation und die Längeninformation zur Verwendung von drahtlosen Vorrichtungen eingerichtet sind, für die die drahtlose Übertragung nicht vorgesehen ist, um zu bestimmen einen restlichen Abschnitt der drahtlose Übertragung fallenzulassen.
45. 45. Das Verfahren nach einem der Beispiele 40 - 44, wobei die Steuerungsinformation mindestens eines der Folgenden aufweist: eine Angabe einer MIMO-Konfiguration zum Empfangen der drahtlosen Übertragung; eine Angabe darüber SU-MIMO der MU-MIMO zu verwenden; eine Angabe eines Kodierungstyps, der für die drahtlose Übertragung verwendet wird; eine Angabe einer Bandbreite der drahtlosen Übertragung; oder ein Angabe einer Fast Fourier Transform (FFT)-Blockgröße, die für die drahtlose Übertragung verwendet wird.
46. 46. Eine drahtlose Vorrichtung, aufweisend: eine Antenne; ein Verarbeitungselement, das operativ an die Antenne gekoppelt ist; wobei das Verarbeitungselement und die Antenne eingerichtet sind, um ein oder alle Teile eines der Verfahren der obigen Beispiele 1 - 45 zu implementieren.
47. 47. Eine drahtlose Anwender-Vorrichtung („user equipment“) (UE), aufweisend:
    • eine oder mehrere Funk-Einheiten, die an eine oder mehrere Antennen gekoppelt sind, die für eine drahtlose Kommunikation eingerichtet sind; und ein Verarbeitungselement, das operativ an die eine oder mehreren Funk-Einheiten gekoppelt ist; wobei die UE eingerichtet ist, um ein oder alle Teile eines der Verfahren der obigen Beispiele 1 - 45 zu implementieren.
48. 48. Ein nicht-flüchtiges Computer-zugängliches Speichermedium, das Anweisungen aufweist, die, wenn sie von einer Vorrichtung ausgeführt werden, die Vorrichtung dazu veranlassen ein oder alle Teile eines der Verfahren der obigen Beispiele 1 - 45 zu implementieren.
49. 49. Ein Computerprogramm, das Anweisungen zum Durchführen von einem oder allen Teile(n) eines der Verfahren der obigen Beispiele 1 - 45 aufweist.
50. 50. Eine Vorrichtung, die Mittel zum Durchführen von einem oder allen Teile(n) eines der Verfahrenselemente der obigen Beispiele 1 - 45 aufweist.

In the following, further exemplary embodiments of the disclosure are listed.

1. A method, comprising: receiving, by a wireless device, a wireless transmission, wherein the wireless transmission comprises a Physical Layer (PHY) preamble and PHY data; the PHY preamble having destination information indicating a destination and having length information indicative of a length of the wireless transmission, the PHY preamble having a portion adapted for channel estimation; the destination information and the Length information is included in the portion of the PHY preamble arranged for channel estimation; Determining, by the wireless device, whether the wireless transmission is for the wireless device based on the destination information; and dropping, by the wireless device, the remainder of the first wireless transmission if the destination information indicates that the wireless transmission is not intended for the wireless device.
2. 2. The method of Example 1, wherein the destination information and the length information are encoded by adding a BPSK signaling carrying the destination information and the length information on a BPSK training sequence, the added BPSK signaling being added by adding the BPSK signaling BPSK training sequence; or by adding a 90 degree rotated BPSK signaling to the BPSK training sequence.
3. 3. The method of any one of Examples 1-2, wherein the wireless transmission is IEEE 802.11 wireless communication; wherein the PHY preamble comprises at least a Legacy Short Training Field and a Legacy Long Training Field; where the destination information and the length information are part of the Legacy Long Training Field.
4. 4. The method of any one of Examples 1-3, wherein dropping by the wireless device the remaining portion of the wireless transmission includes sleeping or entering a low power state for the length of the wireless transmission based on the length information.
5. 5. A method, comprising: performing, by a first wireless device, a first wireless transmission, wherein the first wireless transmission comprises a Physical Layer (PHY) preamble and PHY data, the PHY preamble having destination information comprising a Device for which the first wireless transmission is provided and has length information indicating a length of the first wireless transmission, the PHY preamble having a section adapted for channel estimation; the destination information and the length information being included in the portion of the PHY preamble arranged for channel estimation; Receiving, by a second wireless device, at least a portion of the first wireless transmission; and if the destination information indicates that the first wireless transmission is not for the second wireless device: determining, by the second wireless device, that the first wireless transmission is not for the second wireless device based on the destination information; and dropping, by the second wireless device, the remainder of the first wireless transmission.
6. 6. The method of Example 5, wherein the destination information and the length information are encoded by adding a BPSK signaling carrying the destination information and the length information on a BPSK training sequence, wherein the added BPSK signaling is by: adding the BPSK signaling the BPSK training sequence; or by adding a 90 degree rotated BPSK signaling to the BPSK training sequence.
7. 7. The method of any one of Examples 5-6, wherein the first wireless transmission is IEEE 802.11 wireless communication; wherein the PHY preamble comprises at least a Legacy Short Training Field and a Legacy Long Training Field; where the destination information and the length information are part of the Legacy Long Training Field.
8. 8. The method of any one of Examples 5-7, wherein dropping, by the second wireless device, the remainder of the first wireless transmission comprises sleeping or entering a low power state for the length of the first wireless transmission based on the length information.
9. 9. A method of receiving, by a wireless device, a wireless transmission, wherein the wireless transmission comprises a Physical Layer (PHY) preamble and PHY data; where the PHY preamble is a Destination information indicating a destination and length information indicating a length of the wireless transmission; wherein the PHY preamble comprises a portion adapted for channel estimation, the destination information and the length information being arranged before the portion of the PHY preamble arranged for channel estimation; Determining, by the wireless device, whether the destination information indicates that the wireless transmission is for the wireless device; Dropping, by the wireless device, the remainder of the wireless transmission if the destination information indicates that the wireless transmission is not intended for the wireless device.
10. 10. The method of Example 9, wherein the destination information and the length information are differently coded; wherein the portions of the wireless transmission are coherently coded after the portion adapted for channel estimation.
11. 11. The method of any one of Examples 9-10, wherein the wireless transmission is IEEE 802.11 wireless communication; wherein the PHY preamble comprises at least a Legacy Short Training Field and a Legacy Long Training Field; wherein the destination information and the length information are provided after the Legacy Short Training Field and before the Legacy Long Training Field.
12. 12. The method of any one of Examples 9-11, wherein dropping, by the second wireless device, the remainder of the first wireless transmission comprises sleeping or entering a low power state for the length of the first wireless transmission based on the length information.
13. 13. A method, comprising: performing, by a first wireless device, a first wireless transmission, wherein the first wireless transmission comprises a Physical Layer (PHY) preamble and PHY data, the PHY preamble having destination information comprising a Indicates apparatus for which the first wireless device is provided and has length information indicating a length of the first wireless transmission, the PHY preamble having a portion adapted for channel estimation; the destination information and the length information being arranged before the portion of the PHY preamble arranged for the channel estimation; Receiving, by a second wireless device, at least a portion of the first wireless transmission; and if the destination information indicates that the first wireless transmission is not for the second wireless device: determining, by the second wireless device, that the first wireless transmission is not for the second wireless device based on the destination information; and dropping, by the second wireless device, the remainder of the first wireless transmission.
14. 14. A method, comprising: by a wireless device: receiving a wireless transmission, wherein the wireless transmission comprises a Physical Layer (PHY) preamble and PHY data, the PHY preamble having destination information indicating a destination, and a Length information indicating a length of the wireless transmission; Determining whether the wireless transmission is for the wireless device based on the destination information; Dropping a remaining portion of the wireless transmission if the wireless transmission is not intended for the wireless device.
15. 15. The method of Example 14, wherein the PHY preamble comprises a portion adapted for channel estimation, wherein the destination information and the length information are arranged before the portion of the PHY preamble arranged for channel estimation.
16. 16. The method of Example 14, wherein the destination information and the length information are differently coded; wherein the portions of the wireless transmission are coherently coded after the portion adapted for channel estimation.
17. 17. The method of any of Examples 14-16, wherein the wireless transmission is IEEE 802.11 wireless communication; wherein the PHY preamble comprises at least a Legacy Short Training Field and a Legacy Long Training Field; wherein the destination information and the length information are provided after the Legacy Short Training Field and before the Legacy Long Training Field.
18. 18. The method of any of Examples 14-17, wherein dropping the remainder of the first wireless transmission comprises sleeping or entering a low power state for the length of the first wireless transmission based on the length information.
19. 19. The method of any of Examples 14-18, wherein the destination information comprises any selected one of a partial media access control (MAC) address of the destination device or a partial association ID (PAID) of the destination device.
20. 20. The method of any one of Examples 14-19, wherein the length information indicates a length of wireless transmission of any selected one of bytes or OFDM symbols.
21. 21. The method of any one of Examples 14-16 or 18-19, wherein the wireless transmission is IEEE 802.11 wireless communication, wherein the PHY preamble comprises at least one Legacy Short Training Field and a Legacy Long Training Field, the destination information and the length information is part of the Legacy Long Training Field.
22. 22. The method of any one of Examples 14-21, wherein the destination information and the length information are contained in a differently coded field of the PHY preamble, wherein the OFDM symbols of the destination information and the length information in the differently coded field are repeated at least twice within of the differently coded field.
23. 23. The method of any of Examples 14-22, further comprising:
    • Determining whether a field of the PHY preamble after the legacy short training field is a legacy long training field or low energy signal field having the destination information and the length information.
24. 24. The method of Example 23, wherein determining whether the field of the PHY preamble after the legacy short training field is a legacy long training field or a low energy signal field further comprises: collecting samples for first 0.8μs of the field after the Legacy Short Training Field; Perform auto-correlation of the first 0.8μs with next 0.8μs of the field after the Legacy Short Training Field; Determining that the field after the legacy short training field is a legacy long training field if the auto-correlation results in a peak; and determining that the field after the legacy short training field is a low energy signal field if the auto-correlation does not result in a maximum point.
25. 25. A method, comprising: by a first wireless device: generating a signal for wireless transmission, wherein the signal comprises a physical layer (PHY) preamble and PHY data, the PHY preamble comprising destination information comprising a device indicating the wireless transmission and a length information indicating a length of the wireless transmission; wherein the PHY preamble comprises a portion adapted for channel estimation, wherein the destination information and the length information are arranged before or included in the portion of the PHY preamble arranged for channel estimation; and wireless transmission of the signal.
26. 26. The method of Example 25, wherein the destination information and the length information are arranged in front of the portion of the PHY preamble adapted for the channel estimation and coded differently, the portions of the signal following the portion established for the channel estimation is coded coherently.
27. 27. The method of any one of Examples 25-26, wherein the destination information comprises a partial association ID (PAID) of the target device.
28. 28. The method of any one of Examples 25-27, wherein the signal is an IEEE 802.11 wireless communication signal; wherein the PHY preamble comprises at least one legacy short training field and one legacy long training field, the destination information and the length information being provided after the legacy short training field and before the legacy long training field.
29. 29. The method of any one of Examples 25-27, wherein the signal is an IEEE 802.11 wireless communication signal; wherein the PHY preamble comprises at least one Legacy Short Training Field and a Legacy Long Training Field, the destination information and the length information being provided as part of the Legacy Long Training Field.
30. 30. A method, comprising: by a wireless device: receiving a wireless transmission, wherein the wireless transmission comprises a Physical Layer (PHY) preamble and PHY data, the PHY preamble comprising a Legacy Long Training Field (L-LTF) wherein the L-LTF comprises control information for the wireless transmission; Determining the control information from the L-LTF field; and establishing receive parameters for the wireless transmission based on the control information.
31. 31. The method of Example 30, wherein the L-LTF comprises a BPSK training sequence adapted for channel estimation, wherein the control information is encoded by adding the BPSK signaling to the BPSK training sequence.
32. 32. The method of Example 31, wherein the control information is encoded by adding the BPSK signaling to the BPSK training sequence.
33. 33. The method of Example 31, wherein the control information is encoded by adding a 90 degree rotated BPSK signaling to the BPSK training sequence.
34. 34. The method of any one of Examples 30-33, wherein the control information includes destination and length information for wireless transmission.
35. 35. The method of any one of Examples 30-34, wherein the control information comprises MIMO configuration information for wireless transmission.
36. 36. The method of any one of Examples 30-35, wherein the control information includes an indication of whether the wireless transmission uses multi-user MIMO or single user MIMO.
37. 37. The method of any one of Examples 30-36, wherein the control information includes an indication of a type of encoding used for wireless transmission.
38. 38. The method of any one of Examples 30-37, wherein the control information includes an indication of a bandwidth of the wireless transmission.
39. 39. The method of any one of Examples 30-38, wherein the control information includes an indication of the size of a Fast Fourier Transform block used for wireless transmission.
40. 40. A method, comprising: by a first wireless device: generating a signal for wireless transmission, wherein the signal comprises a physical layer (PHY) preamble and PHY data, the PHY preamble having a training sequence derived from the wireless apparatus for channel estimation, the panel further comprising control information adapted to provide wireless transmission reception parameters; and wireless transmission of the signal.
41. 41. The method of Example 40, wherein the signal is an IEEE 802.11 wireless communication signal, the field comprising a legacy long training field (L-LTF) of the PHY preamble of the IEEE 802.11 wireless communication signal.
42. 42. The method of any one of Examples 40-41, wherein the control information is encoded by adding the BPSK signaling carrying the destination information and the length information to the BPSK training sequence, wherein the added BPSK signaling is added by: adding the BPSK signaling to the BPSK training sequence; or adding a 90 degree rotated BPSK signaling to the BPSK training sequence.
43. 43. The method of any of Examples 40-42, wherein the control information includes destination information indicating a device for which the wireless transmission is provided, and length information indicating a length of the wireless transmission.
44. 44. The method of Example 43, wherein the destination information and the length information are adapted for use with wireless devices for which the wireless transmission is not intended to determine dropping a remaining portion of the wireless transmission.
45. 45. The method of any of Examples 40-44, wherein the control information comprises at least one of: an indication of a MIMO configuration for receiving the wireless transmission; an indication to use SU-MIMO of the MU-MIMO; an indication of a coding type used for wireless transmission; an indication of a bandwidth of the wireless transmission; or an indication of a Fast Fourier Transform (FFT) block size used for wireless transmission.
46. 46. A wireless device, comprising: an antenna; a processing element operatively coupled to the antenna; wherein the processing element and the antenna are arranged to implement any or all parts of one of the methods of Examples 1-45 above.
47. 47. A wireless user device (UE), comprising:
    • one or more radio units coupled to one or more antennas configured for wireless communication; and a processing element operatively coupled to the one or more wireless units; wherein the UE is arranged to implement any or all parts of one of the methods of Examples 1-45 above.
48. 48. A non-transitory computer-accessible storage medium having instructions which, when executed by a device, cause the device to implement any or all portions of any of the methods of Examples 1-45 above.
49. 49. A computer program comprising instructions for performing any or all portions of any of the methods of Examples 1-45 above.
50. 50. An apparatus comprising means for performing any or all parts of one of the process elements of Examples 1-45 above.

The embodiments of the present disclosure may be embodied in any of various forms. For example, some embodiments may be implemented as a computer implemented method, a computer readable storage medium, or a computer system. Other embodiments may be implemented using one or more hardware devices that are tailored to customer needs, such as ASICs. Still other embodiments may be implemented using one or more hardware elements, such as FPGAs.

In some embodiments, a non-transitory computer-readable storage medium may be arranged to store program instructions and / or data, the program instructions, if executed by a computer system, causing the computer system to perform a method, e.g. one of a method embodiments described herein or a combination of the method embodiments described herein or a subset of any of the method embodiments described herein or a combination of the subset.

In some embodiments, a device (eg, STA) may be configured to include a processor (or set of processors) and a storage medium, wherein the storage medium stores program instructions, the processor configured to read the program instructions from the storage medium and wherein the program instructions are executable to implement one of the various method embodiments described herein (or a combination of the method embodiments described herein or a subset of one of the method embodiments described herein or a combination of the subset). The device can be realized in one of several forms.

Although the above embodiments have been described in considerable detail, many variations and modifications will become apparent to those skilled in the art once the foregoing disclosure is fully appreciated. It is intended that the following claims be interpreted to include all such variations and modifications.

Claims (15)

A method, comprising: by a wireless device: receiving a wireless transmission, wherein the wireless transmission comprises a Physical Layer (PHY) preamble and PHY data, wherein a legacy portion of the PHY preamble has destination information indicative of a destination and a length information indicating a length of the wireless transmission; Determining whether the wireless transmission is for the wireless device or not based on the destination information; and Dropping a remaining portion of the wireless transmission if the wireless transmission is not intended for the wireless device. The procedure according to Claim 1 wherein the PHY preamble comprises a portion adapted for channel estimation, wherein the destination information and the length information are arranged before the portion of the PHY preamble arranged for channel estimation. The procedure according to Claim 2 wherein the destination information and the length information are differently coded; wherein portions of the wireless transmission are coherently coded after the portion adapted for channel estimation. The method of claim 1, wherein the wireless transmission is an IEEE 802.11 wireless communication, wherein the PHY preamble comprises at least one Legacy Short Training Field and a Legacy Long Training Field, wherein the destination information and the length information are after the Legacy Short Training Field and in front of the Legacy Long Training Field. The method of claim 1, wherein dropping the remaining portion of the first wireless transmission comprises sleeping or entering a low power state for the length of the first wireless transmission based on the length information. The method of any one of the preceding claims, wherein the destination information comprises any selected one of a partial media access control (MAC) address of the destination device or a partial association ID (PAID) of the destination device. The method of any one of the preceding claims, wherein the length information indicates a length of the wireless transmission of any selected one of bytes or OFDM symbols. A computer program that provides instructions for performing one of the procedures according to the Claims 1 - 7 having. A wireless device comprising: a radio unit, and a processing element operatively coupled to the radio unit; wherein the radio unit and the processing element are arranged to: Receiving a wireless transmission; wherein the wireless transmission comprises a Physical Layer (PHY) preamble and PHY data, wherein a legacy portion of the PHY preamble comprises destination information indicating a destination and having length information indicating a length of the wireless transmission, wherein the PHY preamble comprises a section adapted for channel estimation, wherein the destination information and the length information are arranged before the portion of the PHY preamble arranged for the channel estimation or in the portion of the PHY preamble arranged for the channel estimation; Determining whether the wireless transmission is for the wireless device or not based on the destination information; and Dropping a remaining portion of the wireless transmission if the destination information indicates that the wireless transmission is not intended for the wireless device. The wireless device after Claim 9 wherein the destination information and the length information are arranged prior to the portion of the PHY preamble arranged for the channel estimation and are coded differently, the portions of the wireless transmission being coherently coded to the portion adapted for channel estimation, The wireless device according to one of Claims 9 - 10 wherein the destination information and the length information are contained in a differently coded field of the PHY preamble, wherein the OFDM symbols of the destination information and the length information in the differently coded field are repeated at least twice. The wireless device according to one of Claims 9 - 11 wherein the wireless transmission is an IEEE 802.11 wireless communication, wherein the PHY preamble comprises at least one Legacy Short Training Field and a Legacy Long Training Field, the destination information and the length information being either after the Legacy Short Training Field and before the Legacy Long Training Field or be provided as part of the Legacy Long Training Field. The wireless device according to one of Claims 9 - 12 wherein the radio unit and the processing element are further configured to: determine whether a field of the PHY preamble after the legacy short training field is a legacy long training field or low energy signal field having the destination information and the length information. The wireless device after Claim 13 wherein the radio unit and the processing element are further arranged to determine whether the legacy short training field PHY preamble is a legacy long training field or a low energy signal field: gathering scans for first 0.8μs of the field after the legacy short training field; Perform auto-correlation of the first 0.8μs with next 0.8μs of the field after the Legacy Short Training Field; Determining that the field after the legacy short training field is a legacy long training field if the auto-correlation results in a peak; and determining that the field after the legacy short training field is a low energy signal field if the auto-correlation does not result in a maximum point. The wireless device after one of the previous ones Claims 9 - 14 wherein dropping the remaining portion of the first wireless transmission comprises sleeping or entering a low power state for the length of the first wireless transmission based on the length information.

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