• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    preamble very high throughput 802.11 signaling field with legacy compatibility. The present invention relates to a method and apparatus which are described which includes aspects of a controller configured to create a vht frame which is arranged to include information relating to a modulation and an encoding scheme with which the frame portion data vht is modulated and encoded; and a transmitter configured to transmit the vht frame to one or more stas.
    公开号:BR112012017727B1
    申请号:R112012017727-3
    申请日:2010-11-11
    公开日:2021-07-20
    发明作者:Robert J. Stacey；Thomas J. Kenney；Eldad Perahia
    申请人:Intel Corporation；
    IPC主号:
    专利说明:

    Background
    [0001] This description generally refers to the field of wireless network communication, and in particular to a method and apparatus configured to provide a very high throughput (VHT) 802.11 preamble signaling field with legacy compatibility.
    [0002] Wireless communication systems may operate in accordance with one or more standard protocols including, but not limited to, IEEE 802.11, Bluetooth, advanced mobile telephone services (AMPS), digital AMPS, global system for mobile communications (GSM) , code division multiple access (CDMA), local multipoint distribution systems (LMDS), multichannel multipoint distribution systems (MMDS), and the like. The applicable protocol for standard wireless communications may vary. As the IEEE 802.11 specification has evolved from IEEE 802.11 to IEEE 802.11b (11b standard) to IEEE802.11a (11a standard) and IEEE 802.11g (11b standard), wireless communication devices that are compliant with the 11b standard can exist in the same wireless local area network (WLAN) as standard 11g compliant wireless communication devices.
    [0003] When legacy devices such as those compliant with an earlier version of a standard reside on the same WLAN as devices compliant with earlier versions of the standard, mechanisms or processes can be employed for the legacy devices to know when the latest version of the devices It is utilizing the wireless channel to avoid interference or a collision. A legacy system can be an existing system that is in place and available for use over wireless local area networks. The issue of legacy systems can be important because these systems can remain in place after new standards, methods or networks for future wired local area networks are implemented.
    [0004] Different protocols or standards may operate within different frequency bands, such as 5 to 6 gigahertz (GHz) or alternatively 2.4 GHz. For example, standard 11a may operate within the high frequency band. One aspect of pattern 11a is that portions of the spectrum, between 5 to 6 GHz, are assigned to a channel for wireless communications. The channel can be 20 megahertz (MHz) wide within the frequency band. Standard 11a can also use orthogonal frequency division multiplexing (OFDM). OFDM can be implemented more than subcarriers representing lines, or values, within the frequency domain of the 20 MHz channels. A signal can be transmitted on different subcarriers within the channel. The subcarriers can be orthogonal to each other so that information or data is extracted out of each subcarrier about the signal.
    [0005] Backward compatibility with legacy devices can be enabled at the physical layer (PHY). In the PHY layer, backward compatibility is achieved by reusing the PHY preamble from an earlier standard. Legacy devices can decode the preamble portion of all signals, which provides enough information to determine that the wireless channel is in use for a specific period of time, to avoid interference and collisions although legacy devices cannot fully demodulate or decode the transmitted frame(s).
    [0006] As new standards or protocols are implemented, backward compatibility of receiving and transmitting signals can become more of a relationship. New forms of signage may want more robustness than legacy formats. In addition, frames exchanged within a wireless system can include immediate recognition capabilities, burst information, and exchange of more bits of information than frames used by legacy devices. It is desired to provide a very high throughput of the preamble signaling field that is compatible with legacy STAs. Brief Description of Drawings
    [0007] Figure 1 shows an example diagram of a WLAN that includes wireless communication stations such as an Access Point (AP) and n STAs in accordance with various aspects of the present and description.
    [0008] Figure 2 shows an example protocol architecture for both the access points and the STAs in Figure 1.
    [0009] Figure 3a shows a frame of conventional 802.11 format.
    [00010] Figure 3b shows a frame of conventional HT_MF 802.11n format.
    [00011] Figure 3c shows a frame of TGac VHT MF 802.11 format according to an aspect of the present and description.
    [00012] Figure 3d shows a frame of conventional 802.11 HT_GF format.
    [00013] Figure 3e shows a frame of 802.11 TGac VHT_GF format according to an aspect of the present and description.
    [00014] Figure 4a, 4b and 4c shows a PLCP reception procedure according to an aspect of the present and description. Detailed Description
    [00015] In the description that follows, components have been given the same numeral reference, regardless of whether it is shown in different embodiments. To illustrate an embodiment(s) of the present and description in a clear and concise manner, the drawings may not necessarily be to scale and certain aspects may be shown in somewhat schematic form. Aspects that are described and/or illustrated with respect to one modalities may be used in the same or similar manner in one or more other modalities and/or in combination with or instead of aspects of the other modalities. Definitions
    [00016] Access Point (AP): Any entity that has a station (STA) functionality and provides access to distribution services over the wireless medium (WM) to associated STAs.
    [00017] Greenfield Format (GF): A frame format that is more efficient than mixed format, but it lacks aspects that would make it compatible with legacy devices.
    [00018] High Productivity (HT): A station (STA) that complies with the IEEE 802.11n standard.
    [00019] Medium Access Control (MAC): A Medium Access Control (MAC) is a sublayer of the data communication protocol, also known as Medium Access Control, is a sublayer of the Data Link Layer specified in the seven layers of the OSI model (layer 2).
    [00020] Mixed Format (MF): A frame format that is compatible with legacy devices, ie it is usable in mixed environments where legacy devices are present.
    [00021] Station (STA): Any device that contains an IEEE 802.11-conformant Medium Access Control (MAC) and physical layer interface (PHY) to the wireless medium (WM).
    [00022] Very High Throughput Station (VHT STA): A station (STA) that complies with the expected IEEE 802.11ac standard.
    [00023] Mixed Format Very High Productivity (VHT_MF): A mixed format frame that is compatible with both HT STAs and legacy STAs.
    [00024] Greenfield Format Very High Productivity (VHT_GF): A Greenfield Format that is not necessarily compatible with HT STAs or legacy STAs.
    [00025] Wireless Medium (WM): The may used to implement the transfer protocol data units (PDUs) between peer physical layer entities (PHY) of a wireless local area network (LAN). Description
    [00026] According to various embodiments of this description, a method is described which comprises creating a VHT frame that includes information relating to a modulation and a coding scheme with which a data portion of the VHT frame is modulated and coded; and transmit the VHT frame to one or more STAs. Furthermore, an apparatus is described that is arranged to perform the method, the apparatus including a controller that is configured to create the VHT frame and a transmitter that is configured to transmit the VHT frame to one or more STAs. The device can be configured to operate in a wireless environment including legacy STAs, HT STAs and TGac STAs.
    [00027] According to various embodiments of this description, the VHT frame can be a mixed format frame (MF) or a Greenfield Format frame (GF). The transmitted VHT frame may be an MF frame and includes a legacy compatible portion, where the legacy compatible portion includes information relating to a length of time for which a legacy STA or an HT STA will delay transmission upon detection of the frame. The transmitted MF VHT frame can be configured to be detected as a VHT MF frame by a VHT STA and to be detected as a legacy frame by legacy STAs or HT STAs. The transmitted MF VHT frame may include a VHT-SIG field that appears in the same place as the HT-SIG field of an HT MF frame, but for which a constellation rotation would apply to the HT-SIG field of an HT MF frame it is not applied to the VHT-SIG field of the VHT frame. The transmitted VHT frame can be received in an HT STA as a legacy frame because the rotation of the constellation over the portion of the frame where the HT-SIG field would appear not to be present, and where, as a result, the HT STA postpones based transmission over a frame length indicated in the legacy compatible portion of the frame. In addition, the Cyclic Redundancy Check (CRC) of the VHT-SIG field can be configured to appear invalid for HT STAs. The transmitted MF VHT frame would be detected by an HT STA as a legacy frame because of invalid CRC and, as a result, the HT STA will defer transmission based on the frame length indicated in the legacy compatible portion of the frame.
    [00028] According to various embodiments of this description, an apparatus is described that comprises a receiver configured to receive a VHT MF frame that is arranged to be compatible with legacy HT STAs and STAs and include information regarding a modulation and a coding scheme com wherein the data of the portion of the VHT MF frame is modulated and encoded; and a controller configured to process the received V of the HT MF frame. The VHT frame can be detected as not being an HT frame by virtue of the constellation rotation not being present over a VHT-SIG field of the received frame. The received frame can be detected as a VHT MF frame and not a legacy frame by detecting a valid CTC over a VHT-SIG field of the received frame.
    [00029] According to various embodiments of this description, a method is described which comprises receiving a VHT frame in a VHT STA; and determining whether the received VHT frame is a mixed format frame or a Greenfield frame.
    [00030] The method may include detecting whether the received VHT frame includes an HT-GF-STF field; and demodulating and verifying a CRC validity of an HT-SIG field if the received VHT frame included the HT-GF-STF field.
    [00031] According to various embodiments of this description, a method is described which comprises receiving a wireless frame in a VHT STA; and determine whether the received wireless frame is a VHT frame, an HT frame, or a legacy frame. Furthermore, the method may include detecting whether the received wireless frame includes an HT-GF-STF field; demodulating and verifying a CRC validity of a VHT-SIG field if the received wireless frame included the HT-GF-STF field; and processing the received wireless frame as a VHT GF frame if the CRC is valid. In addition, the method may include detecting whether the received wireless frame includes an L-SIG field; demodulating and verifying a parity of the L-SIG field if the received wireless frame includes the L-SIG field; and detecting an HT-SIG field by detecting a rotation of the constellation of the HT-SIG field; demodulation and verification of a CRC validity of the HT-SIG; and processing the received wireless frame as an 802.11n HT_MF frame if the CRC is valid. Furthermore, the method may include detecting whether the received wireless frame includes a VHT-SIG field by demodulating and checking the CRC validity of a VHT-SIG field; processing the received wireless frame as a TGac VHT_ MF frame if the CRC is valid; and processing the received wireless frame as a legacy frame if the CRC is invalidated.
    [00032] These and other aspects and characteristics, as well as the methods of operation and functions of the related elements of the structure and the combination of parts and manufacturing economies, will become more apparent consideration above the following description and the appended claims with reference to the accompanying drawings all of which from this specification, in which the like numeral reference designates corresponding parts in the various figures. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only and are not intended as a definition of the limits of the claims. As used in the specification and claims, the singular form of "a", "an", and "the" includes plural referents except the context clearly stated otherwise.
    [00033] In many wireless communication systems, a frame structure is used for data transmission between a transmitter and a receiver. For example, the IEEE 802.11 standard uses frame aggregation at a Medium Access Control (MAC) layer and the physical layer (PHY). In a typical wireless station such as a transmitter, an input MAC layer takes a MAC Service Data Unit (MSDU) from higher layers and attaches a MAC header thereto in order to construct a Protocol Data Unit. MAC (MPDU). The MAC header includes information such as a source address (SA) and a destination address (DA). The MPDU is a part of a PHY Service Data Unit (PSDU) and is transferred to a PHY layer at the transmitter to attach a PHY header thereto to build a Protocol PHY Data Unit (PPDU) for transmission to another station wireless such as a receiver. The PHY header includes parameters for determining a transmission scheme including an encoding/modulation scheme.
    [00034] Figure 1 shows an example diagram of an example WLAN system 300 that includes communication stations such as an n AP 102 and n STAs 104 (STA1, ., STAn), according to an embodiment of the present invention. STAs 104 may include TGac STAs, HT STAs, and legacy STAs. AP 102 provides central coordination.
    [00035] A legacy frame and a legacy STA is a frame or STA respectively that conforms to the 802.11a/g standard. An HT or HT STA frame is a frame or STA respectively that conforms to the 802.11n standard. An HT STA is backward compatible with a legacy STA. A VHT frame and a VHT STA, in accordance with various aspects of the present and description, is a frame or a STA respectively that conforms to the 802.11 standard being developed by the TGac working group within the 802.11 working group. A VHT STA would be backward compatible with a HT STA and a legacy STA.
    [00036] IEEE 802.11n builds on the earlier 802.11 standards by adding multiple input-output multiples (MIMO) and 40 MHz channels to the PHY (physical layer), and frame aggregation to the MAC layer. MIMO is a technology that uses multiple antennas to coherently resolve more information that makes it possible to use a single antenna.
    [00037] Figure 2 shows an example protocol architecture for each STA 104. Each STA 104 implements a WLAN layer PHY 210 and a MAC layer 212. The layer PHY 210 includes two sublayers: a physical layer convergence process (PLCP) sublayer and a dependent media sublayer (PMD). MAC layer 212 constructs MAC packets from data frames, and then provides PHY layer 210 for transmission over a shared wireless channel. Similarly, the AP 102 also includes a MAC layer and a PHY layer, as described.
    [00038] In general, TGac devices are devices that can operate in the 5GHz frequency band. TGac devices can use an operating mode that supports an throughput of at least 500 Mbps on top of the MAC data service access point (MAC SAP) using no more than 80 MHz of channel bandwidth in the 5GHz band or one mode of operation that supports an aggregate throughput of at least 1 Gbps on top of data service MAC access points (MAC SAPs) utilizing no more than 80 MHz of channel bandwidth in the 5GHz band. Typically, there is no restriction on the number of transmit or receive antennas being used on any devices. TGac devices are delayed compatible with IEEE 802.11a operating devices in the 5 GHz frequency band and are delayed compatible with IEEE 802.11n operating devices in the 5 GHz frequency band. TGac devices can be configured to provide mechanisms to allow coexistence and sharing of the spectrum with IEEE802.11a/n devices operating in the same frequency band.
    [00039] Figures 3a, 3b and 3d show conventional 802.11a, 802.11n HT_MF, and 802.11n HT_GF frames, respectively. Figures 3c and 3e show 802.11 TGac VHT_MF and 802.11 TGac HT_GF frames, respectively, in accordance with various aspects of the present and description. As shown in Figure 3a, conventional 802.11a frames consist of a preamble followed by a data payload. The preamble includes the legacy short instruction field (L-STF), legacy long instruction field (L-LTF) and legacy signal field (L-SIG). The data payload includes the service field, user data (PSDU), buffer bits, and end bits.
    [00040] In IEEE 802.11n WLAN communications, if legacy STAs and high-throughput stations (HT-STAs) coexist on the same WLAN, then frames from the HT stations use a mixed-mode PHY layer header that both includes a legacy header part PHY is a high-throughput (HT) part of the PHY header followed by the data payload. Legacy frame format can be sufficiently received by both L stations and HT stations. However, legacy STAs cannot receive HT frames sufficiently because L stations cannot understand the HT header PHY part of the HT frames. As shown in Figure 3b, the conventional 802.11n HT_MF frame includes legacy format frame where a legacy header of the PHY part includes legacy instruction fields (L-TFs) and a legacy signal field (L-SIG). In addition, an HT header part PHY includes an HT signal field (HT-SIG), HT short-term field formation (HT-STF) and HT long instruction fields (HT-LTF1). One or more data fields can include service field, user data (PSDU), buffer bits, and end bits.
    [00041] In Greenfield (GF) mode, High Productivity (HT) packets are transmitted without a compatible legacy part. As shown in Figure 3d, the conventional 802.11n HT_GF frame includes a high-throughput (HT) header part PHY including preamble signaling fields followed by the data payload. The HT PHY header includes HT training short field (HT-GF-STF), HT long instruction field (HT-LTF1) and HT signaling field (HT-SIG). The data payload includes the service field, user data (PSDU), buffer bits, and end bits.
    [00042] Figures 3c and 3e show 802.11 TGac VHT_MF and 802.11 TGac VHT_GF frames, respectively, according to various aspects of the present and description. As shown in Figure 3c, the 802.11 TGac VHT_ MF frame includes a legacy header PHY part includes legacy short term formation field (L-STF), legacy long instruction field (L-LTF) and legacy signaling field (L-SIG) as shown and described in Figures 3a and 3b. A very high throughput (VHT) signaling field (VHT-SIG) follows the L-SIG field and appears in the same position as the HT-SIG field as shown and described in Figure 3b followed by the data payload.
    [00043] As shown in Figure 3e, the 802.11 TGac VHT_GF framework includes the HT Short Course Training Field (HT-GF-STF) and the Long HT Instruction Field (HT-LTF1). A very high throughput (VHT) signaling field (VHT-SIG) follows the HT-LTF1 field and appears in the same position as the HT-SIG field as shown and described in figure 3d followed by the payload of data it may include a service field, user data (PSDU), buffer bits and end bits.
    [00044] Going back to figure 1 again, one of the STAs can be configured to create a VHT board as shown in figures 3c or figure 3e. STAs can be equipped with one or more antennas that are arranged to transmit the VHT frame to one or more other STAs. The transmitting STA can be configured to operate in a wireless environment including legacy STAs, HT STAs, and TGac STAs.
    [00045] As described above, the VHT frame can be a mixed format frame as shown in figure 3c or a Greenfield frame format as shown in figure 3e. If the transmitted VHT frame is the mixed format frame, then it may include a legacy compatible portion, where the legacy compatible portion includes information regarding a length of time for which a legacy STA and an HT STA will defer transmission. The transmitted VHT frame can be configured to be detected as a VHT frame by a VHT STA to be detected as a legacy frame by legacy STAs or HT STAs. The transmitted VHT frame may include a VHT-SIG field that appears in the same place as the HT-SIG field of an HT frame, but for which a constellation rotation that would apply to the HT-SIG field of an HT frame is not applied to the VHT-SIG field of the VHT frame.
    [00046] The transmitted VHT frame can be received in an HT STA as a legacy frame because a rotation of the constellation over the portion of the frame where the HT-SIG field would appear not to be present, and where, as a result, the HT STA postpones transmission based on a frame length indicated in the legacy compatible portion of the frame. In addition, the Cyclic Redundancy Check (CRC) of the VHT-SIG field can be configured to appear invalid to HT STAs. The transmitted VHT frame would be received in an HT STA as a legacy frame because of the lack of constellation rotation and invalid CRC, and where, as a result, the HT STA will delay transmission based on a frame length indicated in the legacy compatible portion from the board.
    [00047] In some aspects, the VHT-SIG field can have the constellation rotation defined for the VHT-SIG field, but not to be realized for TGac PHY formats. The VHT-SIG can be modulated using the same binary phase shift coding (BPSK) rate^MCS (modulation/coding scheme) used in the legacy SIG symbol and the VHT-SIG CRC definition can be changed from which used to 802.11 n frames so the CRC will appear invalid to an 802.11n device. The VHT SIG CRC definition can be changed using one or more of the following techniques: use a different polynomial, use a different initialization value, perform a simple transformation (such as inversion), include additional bits in the CRC calculation (for example, the from the L-SIG field), use a different length of CRC. This will allow an 802.11n STA to treat the VHT frame as a legacy 802.11a frame and defer transmission based on the frame length indicated in the legacy GIS field.
    [00048] Figures 4a, 4b and 4c show a PLCP reception procedure for a VHT STA in accordance with various aspects of the present and description. A frame is received at 405. At 410, a determination is made as to whether the received frame is a Greenfield format frame by checking to see if an HT-GF-STF is received. If the result of the determination at 410 is a yes, then the HT-SIG/VHT-SIG field is demodulated and the CRC validity checked at 415. If the CRC is determined to be valid for an HT-SIG field at 420, then the frame is determined to be an HT_GF frame and treated as such in 425. If the CRC is determined to be valid for a VHT-SIG field in 430, then the frame is determined to be a TGac VHT_GF frame and treated as such in 435. Otherwise, the received frame is treated as an invalid frame in 440.
    [00049] If the determination result in 410 is not, then the frame is detected for an L-SIG field in 445. The L-SIG field is demodulated and the parity of the L-SIG field is validated in 450. The presence of a valid L-SIG field by itself does not indicate that the frame is a legacy 802.11a frame. At 455, a determination is made as to whether an HT-SIG field is detected. If the constellation rotation is detected at 460, then the frame format is treated as an 802.11n HT_MF 465 frame. The HT-SIG field is then demodulated and checked for validity of the CRC in the HT-SIG field.
    [00050] If constellation rotation is not detected at 460, then a VHT-SIG field is detected at 470 by unrotated BPSK constellation demodulation and CRC validity at 475. If CRC is determined to be valid at 480, then the format The frame is determined from the contents of the VHT-SIG field at 485. If the CRC is determined not to be valid at 480, then the frame is treated as a legacy frame format at 490.
    [00051] In some respects, outside the VHT frame format, a legacy 802.11a device will fail the 802.11n frame green field check (CRC). Furthermore, a legacy 802.11a device will seek and defer transmission based on the content of the L-SIG field. A legacy 802.11n device will look for an HT-SIG field. In some aspects, legacy devices may look for constellation rotation only. In some respects, the legacy device can look for constellation rotation and valid CRC, and in some respects, legacy devices can just look for a valid CRC. In these examples, since neither constellation rotation nor valid CRC are present, these legacy devices will delay transmission based on L-SIG content.
    [00052] In some respects, for VHT-SIG CRC, there are several options that will ensure that CRCs are determined to be invalid by a legacy 802.11n device. CRC can use a different polynomial than 802.11n HT-SIG CRC. CRC can use the same polynomial but a different initialization value than 802.11n HT-SIG CRC. CRC can use the same polynomial and initialization value and perform a simple transformation (such as inversion) before insertion into the VHT-SIG. A simple transform (such as inversion) can be performed on other bits in the VHT-SIG after CRC computation. CRC can use the same polynomial and initialization value, but cover additional bits, such as L-SIG field plus VHT-SIG field. The CRC can be a new CRC of different length than the 802.11n HT-SIG CRC with any polynomial.
    [00053] Although the above description discusses what is currently considered to be a variety of useful modalities, it is to be understood that such detail is for that purpose only, and that the appended claims are not limited to the written modalities, but by rather, they are intended to cover modifications and equivalent provisions that are within the spirit and scope of the appended claims.
    权利要求:
    Claims (10)
    [0001]
    1. Apparatus (102) characterized in that it comprises: a wireless communication controller configured to create a frame which is arranged to include information indicating a modulation and encoding scheme with which a data portion of the frame is modulated and encoded ; and a transmitter configured to transmit the frame to one or more stations, STAs (104), wherein the frame is a mixed format frame or a Greenfield frame, and wherein the frame includes a legacy compatible portion, and wherein the frame is to have a legacy signal field followed by a very high throughput signal field, VHT.
    [0002]
    2. Apparatus according to claim 1, characterized in that the apparatus is configured to communicate with legacy STAs, high-throughput stations, HT STAs, and VHT STAs.
    [0003]
    3. Apparatus according to claim 1, characterized in that a cyclic redundancy check, CRC, of a VHT signal field, VHT-SIG, is configured to appear invalid to HT STAs.
    [0004]
    4. Apparatus characterized in that it comprises: a very high throughput station, VHT STA, including a receiver configured to receive a wireless frame and further including a controller configured to determine whether the received wireless frame is a mixed format frame. or a Greenfield format frame by detecting whether the received wireless frame includes a high throughput Greenfield short boot camp, HT-GF-STF field, and processing the received wireless frame as either a mixed format frame or a frame. Greenfield format based on detected HT-GF-STF field, where the wireless frame is to have a legacy signal field followed by a VHT signal field, and where the controller is configured to detect whether the received wireless frame includes an L-SIG field, demodulate and check a parity of the legacy signal field, L-SIG, if the received wireless frame included the L-SIG field, detect an HT signal field, HT-SIG, detect a constellation rotation d o HT-SIG, demodulate and verify a cyclic redundancy check validity, CRC, of the HT-SIG, and process the received wireless frame as a high throughput mixed format frame, HT_MF, of 802.11n if the CRC is valid .
    [0005]
    5. Apparatus according to claim 4, characterized in that the controller is configured to detect whether the received wireless frame includes a VHT-SIG field, demodulate and verify a CRC validity of a VHT-SIG field if the frame received wireless included the VHT-SIG field, processing the received wireless frame as a very high throughput mixed format frame, VHT_MF, if the CRC is valid, and processing the received wireless frame as a legacy frame if the CRC is invalidated.
    [0006]
    6. Method characterized by the fact that it comprises: receiving a wireless frame at a very high throughput station, VHT STA; determine whether the received wireless frame is a mixed format frame or a Greenfield format frame by detecting whether the received wireless frame includes a high throughput Greenfiel short boot camp, HT-GF-STF, where the wireless frame is to have a legacy signal field followed by a VHT signal field; processing the received wireless frame as a mixed format frame or a Greenfield format frame based on the detected HT-GF-STF field; demodulating and verifying a validity of a Cyclic Redundancy Check, CRC, of a VHT signal field, VHT-SIG, if the received wireless frame included the HT-GF-STF field; and processing the received wireless frame as a Greenfield VHT format frame if the CRC is determined to be valid.
    [0007]
    7. Method according to claim 6, characterized in that it further comprises: detecting whether the received wireless frame includes a legacy signal field, L-SIG; demodulate and verify a parity of the L-SIG field if the received wireless frame included the L-SIG field; detect a signal field from HT, HT-SIG; detect an HT-SIG constellation rotation; demodulate and verify a CRC validity of the HT-SIG; and processing the received wireless frame as an 802.11n high throughput mixed format frame, HT_MF, if the CRC is valid.
    [0008]
    8. Method according to claim 7, characterized in that it further comprises: detecting whether the received wireless frame includes a VHT-SIG field; demodulate and verify a CRC validity of a VHT-SIG field if the received wireless frame included the VHT-SIG field; process the received wireless frame as a high throughput mixed format frame, VHT_MF, if the CRC is valid; and processing the received wireless frame as a legacy frame if the CRC is invalid.
    [0009]
    9. A method characterized in that it comprises: creating a frame which is arranged to include information indicating a modulation and coding scheme with which a data portion of the frame is modulated and coded; and transmitting the frame to one or more stations, STAs, where the frame is a mixed format frame or a Greenfield frame, where the frame includes a legacy compatible portion, where the frame is to have a legacy signal field followed by a very high productivity signal field, VHT.
    [0010]
    10. Method according to claim 9, characterized in that the transmitted frame is configured to be detected as a legacy frame by legacy STAs or high-throughput stations, HT STAs.
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    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-01-14| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04B 7/26 , H04W 84/12 Ipc: H04L 1/00 (1968.09), H04W 72/04 (2009.01), H04W 88 |
    2020-01-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-06-01| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-07-20| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 11/11/2010, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |
    优先权:
    申请号 | 申请日 | 专利标题
    US12/644,475|2009-12-22|
    US12/644,475|US8238316B2|2009-12-22|2009-12-22|802.11 very high throughput preamble signaling field with legacy compatibility|
    PCT/US2010/056313|WO2011087560A2|2009-12-22|2010-11-11|802.11 very high throughput preamble signaling field with legacy compatibility|
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