CN116033489A - Flushing mechanism for reorder buffers at a recipient station - Google Patents
Flushing mechanism for reorder buffers at a recipient station Download PDFInfo
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Abstract
The present application relates to a flushing mechanism for reorder buffers at a receiver station. Apparatus and methods for flushing a reorder buffer at a receiver STA are provided herein. An apparatus for an initiator STA, comprising: an interface circuit; and processing circuitry coupled with the interface circuitry and configured to: generating a quality of service, qoS, data frame comprising control information associated with flushing of a reorder buffer at a receiver STA; and provides the QoS data frame to the interface circuit for transmission to the receiving STA.
Description
Technical Field
Embodiments of the present disclosure relate generally to wireless communications and, in particular, relate to an apparatus and method for flushing a reorder buffer at a receiver Station (STA).
Background
Wireless devices are becoming widely popular and increasingly request access to wireless channels. The Institute of Electrical and Electronics Engineers (IEEE) is developing one or more standards that utilize Orthogonal Frequency Division Multiple Access (OFDMA) in channel allocation.
Disclosure of Invention
According to an aspect of the present disclosure, there is provided an apparatus for an initiator STA, comprising: an interface circuit; and processing circuitry coupled with the interface circuitry and configured to: generating a quality of service, qoS, data frame comprising control information associated with flushing of a reorder buffer at a receiver STA; and provides the QoS data frame to the interface circuit for transmission to the receiving STA.
According to another aspect of the present disclosure, there is provided an apparatus for a receiver station STA, comprising: an interface circuit; and processing circuitry coupled with the interface circuitry and configured to: decoding a quality of service, qoS, data frame received from an initiator STA via an interface circuit, the QoS data frame including control information associated with flushing of a reorder buffer at a receiver STA; and flushing the reorder buffer based on control information in the decoded QoS data frame.
Drawings
Embodiments of the present disclosure will now be described, by way of example and not limitation, in the figures of the accompanying drawings in which like reference numerals refer to similar elements.
Fig. 1 is a network diagram illustrating an example network environment for implementing flushing of reorder buffers at a receiver STA according to one or more example embodiments of the present disclosure.
Fig. 2 illustrates example interactions between an initiator STA and a receiver STA in a typical Wi-Fi communication according to current IEEE standards.
Fig. 3 illustrates an example QoS data frame in accordance with some embodiments of the present disclosure.
Fig. 4 illustrates example control information subfields in an aggregate control field according to some embodiments of the present disclosure.
Fig. 5 illustrates a flowchart of an example process associated with a reorder buffer flush performed by an initiator STA, according to some embodiments of the present disclosure.
Fig. 6 illustrates a flowchart of another example process associated with a reorder buffer flush performed by an initiator STA, according to some embodiments of the present disclosure.
Fig. 7 illustrates a flowchart of an example process associated with a reorder buffer flush performed by a receiver STA, according to some embodiments of the present disclosure.
Fig. 8 illustrates a flowchart of another example process associated with reorder buffer flushing performed by a receiver STA, according to some embodiments of the present disclosure.
Fig. 9 illustrates a functional diagram of an exemplary communication station that may be suitable for use as a user device in accordance with one or more exemplary embodiments of the present disclosure.
Fig. 10 illustrates a block diagram of an example machine on which any of one or more techniques (e.g., methods) may be performed, according to one or more example embodiments of the present disclosure.
Fig. 11 is a block diagram of a radio architecture according to some examples.
Fig. 12 illustrates an example front-end module circuit for use in the radio architecture of fig. 11 in accordance with one or more example embodiments of the present disclosure.
Fig. 13 illustrates an example radio IC circuit for use in the radio architecture of fig. 11 in accordance with one or more example embodiments of the present disclosure.
Fig. 14 illustrates an example baseband processing circuit for use in the radio architecture of fig. 11 in accordance with one or more example embodiments of the disclosure.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, algorithm, and other changes. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments set forth in the claims encompass all available equivalents of those claims.
In wireless fidelity (Wi-Fi) communications, the acknowledgement mechanism generally works by: a receiver Station (STA) or receiver multi-link device (MLD) is caused to maintain a reorder buffer of Medium Access Control (MAC) service data units (MSDUs) for each initiator STA or MLD and each Traffic Identifier (TID). When the receiving STA receives the MSDU corresponding to the header of the reorder buffer, the receiving STA may forward the MSDU to an upper layer along with all subsequent MSDUs that have been successfully received in sequential order so far. However, at any given point in time, there may be a hole in the reorder buffer corresponding to a missing MSDU (i.e., a missing MSDU during transmission). All MSDUs following the first hole need to be kept until the reorder buffer moves to the right. In addition to receiving a missing MSDU corresponding to a hole (e.g., by retransmission), the reorder buffer may generally be moved in response to: (a) MSDUs with higher Sequence Numbers (SNs) are received and the reorder buffer is full or (b) an explicit Block Acknowledgement Request (BAR) frame is received. In the latter case, the initiator STA explicitly informs the recipient STA to move the reorder buffer by indicating the SN of the next expected MSDU and instructing the recipient STA to flush or forward all previously received MSDUs without further delay. This BAR mechanism helps reduce latency because MSDUs that have been received correctly can be forwarded up (e.g., to the Logical Link Control (LLC) layer) without waiting for a lost MSDU to be received.
However, the exchange of BAR frames requires the initiator STA to explicitly send a new control frame, which has a high overhead in terms of both transmission time and time to acquire channel access. Some low latency applications (e.g., live streaming) may require faster signaling to flush MSDUs in the reorder buffer of the receiving STA.
In view of this problem, it is proposed, in accordance with embodiments of the present disclosure, to utilize existing frames to carry information associated with flushing of a reorder buffer in order to provide a mechanism for lightweight flushing of a reorder buffer at a receiver STA that is suitable for low latency applications.
Fig. 1 is a network diagram illustrating an example network environment for implementing lightweight flushing of reorder buffers according to some example embodiments of the present disclosure. The wireless network 100 may include one or more user devices 120 and one or more Access Points (APs) 102, which may communicate in accordance with an IEEE 802.11 communication standard. The user device 120 may be a mobile device that is non-stationary (e.g., does not have a fixed location) or may be a stationary device.
In some embodiments, the user device 120 and the AP 102 may include one or more computer systems, similar to that shown in the functional diagram of fig. 9 and/or the example machine/system of fig. 10.
One or more illustrative user devices 120 and/or APs 102 may be operated by one or more users 110. It should be noted that any addressable unit may be a Station (STA). The STA may have a number of different features, each of which shapes its function. For example, a single addressable unit may be a portable STA, a quality of service (QoS) STA, a dependent STA, and a hidden STA at the same time. One or more of the illustrative user devices 120 and the AP 102 may be STAs. One or more of the illustrative user devices 120 and/or APs 102 may operate as a Personal Basic Service Set (PBSS) control point/access point (PCP/AP). User device 120 (e.g., 124, 126, or 128) and/or AP 102 may include any suitable processor-driven device, including but not limited to a mobile device or a non-mobile device, such as a static device. For example, user device 120 and/or AP 102 may include a User Equipment (UE), a Station (STA), an Access Point (AP), a software-enabled AP (SoftAP), a Personal Computer (PC), a wearable wireless device (e.g., a wristband, watch, glasses, ring, etc.), a desktop computer, a mobile computer, a laptop computer, an ultrabook, etc TM Computers, notebook computers, tablet computers, server computers, handheld devices, internet of things (IoT) devices, sensor devices, PDA devices, handheld PDA devices, in-vehicle devices, off-vehicle devices, hybrid devices (e.g., combining cellular telephone functionality with PDA device functionality), consumer devices, in-vehicle devices, off-vehicle devices, mobile or portable devices, non-mobile or non-portable devices, mobile phones, cellular phones, PCS devices, PDA devices including wireless communication devices, mobile or portable GPS devices, DVB devices, relatively small computing devices, non-desktop computers, "light-weight-up, open-life" (CSLL) devices, ultra Mobile Devices (UMD), ultra Mobile PCS (UMPC), mobile Internet Devices (MID), "origami" devices or computing devices, devices that support Dynamic Combination Computing (DCC), context-aware devices, video devices, audio devices, a/V devices, set-top Boxes (BD) players, BD compact discs, digital video discs (cd-recorders), digital discs (BD) players A (DVD) player, a High Definition (HD) DVD player, a DVD recorder, a HD DVD recorder, a Personal Video Recorder (PVR), a broadcast high definition receiver, a video source, an audio source, a video receiver, an audio receiver, a stereo tuner, a broadcast radio receiver, a flat panel display, a Personal Media Player (PMP), a Digital Video Camera (DVC), a digital audio player, a speaker, an audio receiver, an audio amplifier, a game device, a data source, a data receiver, a digital camera (DSC), a media player, a smart phone, a television, a music player, and the like. Other devices, including smart devices, such as lights, climate controls, automotive parts, household parts, appliances, etc., may also be included in this list.
As used herein, the term "internet of things (IoT) device" is used to refer to any object (e.g., appliance, sensor, etc.) that has an addressable interface (e.g., internet Protocol (IP) address, bluetooth Identifier (ID), near Field Communication (NFC) ID, etc.) and that can transmit information to one or more other devices through a wired or wireless connection. The internet of things device may have a passive communication interface, such as a Quick Response (QR) code, a Radio Frequency Identification (RFID) tag, an NFC tag, etc., or an active communication interface, such as a modem, transceiver, transmitter-receiver, etc. The internet of things device may have a particular set of attributes (e.g., device status, such as whether the internet of things device is on or off, idle or active, available for task execution or busy, etc., cooling or heating functions, environmental monitoring or recording functions, lighting functions, sounding functions, etc.), which may be embedded in and/or controlled/monitored by a Central Processing Unit (CPU), microprocessor, ASIC, etc., and configured to connect to an IoT network, such as a local ad hoc network or the internet. For example, the internet of things devices may include, but are not limited to, refrigerators, toasters, ovens, microwave ovens, freezers, dishwashers, tableware, hand tools, washing machines, dryers, stoves, air conditioners, thermostats, televisions, lights, vacuum cleaners, sprinklers, electricity meters, gas meters, and the like, provided that the devices are equipped with an addressable communication interface for communicating with the internet of things network. The internet of things devices may also include cell phones, desktop computers, laptop computers, tablet computers, personal Digital Assistants (PDAs), and the like. Thus, the internet of things network may include a combination of "traditional" internet-accessible devices (e.g., laptop or desktop computers, cell phones, etc.) and devices that typically do not have internet connectivity (e.g., dishwashers, etc.).
The user device 120 and/or the AP 102 may also include, for example, mesh stations in a mesh network in accordance with one or more IEEE 802.11 standards and/or 3GPP standards.
Any of the user devices 120 (e.g., user devices 124, 126, 128) and the AP 102 may be configured to communicate with each other in a wireless or wired manner via one or more communication networks 130 and/or 135. User devices 120 may also communicate peer-to-peer or directly with each other with or without AP 102. Any of communication networks 130 and/or 135 may include, but are not limited to, a combination of any of a variety of suitable communication networks, such as a broadcast network, a wired network, a public network (e.g., the internet), a private network, a wireless network, a cellular network, or any other suitable private and/or public network. Further, any of communication networks 130 and/or 135 may have any suitable communication range associated therewith, and may include, for example, a global network (e.g., the internet), a Metropolitan Area Network (MAN), a Wide Area Network (WAN), a Local Area Network (LAN), or a Personal Area Network (PAN). Further, any of communication networks 130 and/or 135 may include any type of medium that may carry network traffic including, but not limited to, coaxial cable, twisted pair, fiber optics, hybrid fiber-optic coaxial (HFC) medium, microwave terrestrial transceiver, radio frequency communication medium, white space communication medium, ultra-high frequency communication medium, satellite communication medium, or any combination thereof.
Any of the user devices 120 (e.g., user devices 124, 126, 128) and the AP 102 may include one or more communication antennas. The one or more communication antennas may be any suitable type of antennas corresponding to the communication protocols used by user device 120 (e.g., user devices 124, 126, and 128) and AP 102. Some non-limiting examples of suitable communication antennas include Wi-Fi antennas, institute of Electrical and Electronics Engineers (IEEE) 802.11 family standard compliant antennas, directional antennas, non-directional antennas, dipole antennas, folded dipole antennas, patch antennas, multiple-input multiple-output (MIMO) antennas, omni-directional antennas, quasi-omni-directional antennas, and the like. One or more communication antennas may be communicatively coupled to the radio to transmit and/or receive signals, e.g., communication signals, to and/or from user device 120 and/or AP 102.
Any of the user devices 120 (e.g., user devices 124, 126, 128) and the AP 102 may be configured to perform directional transmission and/or directional reception in connection with wireless communications in a wireless network. Any of the user devices 120 (e.g., user devices 124, 126, 128) and the AP 102 may be configured to perform such directional transmission and/or reception using a set of multi-antenna arrays (e.g., DMG antenna arrays, etc.). Each of the plurality of antenna arrays may be used for transmission and/or reception in a particular respective direction or range of directions. Any of the user devices 120 (e.g., user devices 124, 126, 128) and the AP 102 may be configured to perform any given directional transmission to one or more defined transmission sectors. Any of the user devices 120 (e.g., user devices 124, 126, 128) and the AP 102 may be configured to perform any given directional reception from one or more defined reception sectors.
MIMO beamforming in a wireless network may be implemented using RF beamforming and/or digital beamforming. In some embodiments, in performing a given MIMO transmission, user device 120 and/or AP 102 may be configured to perform MIMO beamforming using all or a subset of its one or more communication antennas.
Any of the user devices 120 (e.g., user devices 124, 126, 128) and the AP 102 may include any suitable radio and/or transceiver for transmitting and/or receiving Radio Frequency (RF) signals in bandwidths and/or channels corresponding to the communication protocols used by any of the user devices 120 and the AP 102 for communicating with each other. The radio component may include hardware and/or software to modulate and/or demodulate communication signals according to a pre-established transmission protocol. The radio may also have hardware and/or software instructions to communicate via one or more Wi-Fi and/or Wi-Fi direct protocols, as standardized by the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. In certain example embodiments, a radio component in cooperation with a communication antenna may be configured to communicate over a 2.4GHz channel (e.g., 802.11b, 802.11g, 802.11n, 802.11 ax), a 5GHz channel (e.g., 802.11n, 802.11ac, 802.11 ax), or a 60GHz channel (e.g., 802.11ad, 802.11 ay), an 800MHz channel (e.g., 802.11 ah). The communication antenna may operate at 28GHz and 40GHz. It should be appreciated that the list of communication channels according to some 802.11 standards is only a partial list, and that other 802.11 standards (e.g., next generation Wi-Fi or other standards) may be used. In some embodiments, a non-Wi-Fi protocol may be used for communication between devices, such as bluetooth, dedicated Short Range Communication (DSRC), ultra High Frequency (UHF) (e.g., IEEE 802.11af, IEEE 802.22), white band frequency (e.g., white space), or other packet radio communication. The radio may include any known receiver and baseband suitable for communication via a communication protocol. The radio component may also include a Low Noise Amplifier (LNA), additional signal amplifiers, an analog-to-digital (a/D) converter, one or more buffers, and a digital baseband.
In some embodiments, and referring to fig. 1, ap 102 may facilitate a lightweight flush of reorder buffers with one or more user devices 120. Thus, the user device 120 may be an initiator STA and the AP 102 may be a receiver STA.
Fig. 2 illustrates example interactions between an initiator STA and a receiver STA in a typical Wi-Fi communication according to current IEEE standards. As shown in fig. 2, an initiator STA may transmit QoS data frames to transmit MSDUs to a receiver STA. The QoS data frame may include a MAC header and a plurality of MSDUs. The MAC header may include a control frame to facilitate transmission of QoS data frames. The receiving STA may record the reception state of the MSDU after receiving the MSDU from the originating STA, but may not feed back the reception state to the originating STA until a Block Acknowledgement Request (BAR) frame from the originating STA is received. In other words, the initiator STA may send a BAR frame to the recipient STA to request a Block Acknowledgement (BA). Accordingly, the receiving STA may receive the BAR frame and transmit the BA frame to the initiating STA.
In addition, prior to transmitting the QoS data frames, the initiator STA may transmit one or more management frames to establish an appropriate communication link with the recipient STA. For example, the management frame may include a Stream Class Service (SCS) request frame introduced to enable high QoS data transmission between the initiator STA and the receiver STA. SCS is a supplementary service that the AP may provide to linked STAs to classify multimedia streams according to subjective rules directly defined by the STAs. The STA seeking SCS may send an SCS request frame to the AP, the request frame including an identification of the requested SCS stream and a descriptor of the classification model. The AP may choose to accept or reject SCS requests from the STA.
As previously described, in Wi-Fi communication, the acknowledgement mechanism typically works by having the receiver STA or receiver MLD maintain a reorder buffer of MSDUs for each TID and each initiator STA or MLD. The receiver MLD may include one or more receiver STAs, and the initiator MLD may include one or more initiator STAs. When the receiving STA receives an MSDU corresponding to the header of the reorder buffer, the receiving STA may forward the MSDU to an upper layer (e.g., LLC layer) along with all subsequent MSDUs that have been successfully received in sequential order so far. However, there may be holes in the reorder buffer corresponding to the lost MSDUs, i.e., those MSDUs that were lost during transmission. All MSDUs following the first hole in the reorder buffer need to be held until the reorder buffer moves to the right.
In general, the initiator STA may explicitly inform the recipient STA to move the reorder buffer by sending a BAR frame indicating the SN of the next expected MSDU and instructing the recipient STA to flush or forward all previously received MSDUs without further delay. However, the exchange of BAR frames requires the initiator STA to explicitly send a new control frame, which has a high overhead in terms of both transmission time and time to acquire channel access.
In accordance with embodiments of the present disclosure, it is proposed to utilize existing frames in a typical Wi-Fi communication to carry information associated with flushing of a reorder buffer at a receiver STA in order to provide a mechanism for lightweight flushing of a reorder buffer suitable for low latency applications
It is to be understood that the above description is intended to be illustrative, and not restrictive. There may be many examples, configurations, procedures, etc., some of which are described in more detail below. Example embodiments will now be described with reference to the accompanying drawings.
In some embodiments of the present disclosure, the initiator STA may generate a QoS data frame including control information associated with flushing of a reorder buffer at the receiver STA and transmit the QoS data frame to the receiver STA. Accordingly, the receiving STA may decode the QoS data frame received from the originating STA and flush the reorder buffer based on the control information carried in the QoS data frame.
Specifically, as shown in fig. 3, the QoS data frame may include a MAC header and a plurality of MSDUs, and the MAC header may include an aggregation control (a-Ctrl) field carrying control information.
In some embodiments, multiple MSDUs in a QoS data frame may have the same TID. In this case, the control information may include a highest scoutable SN configured to indicate that MSDUs transmitted via QoS data frames and having SNs lower than the highest scoutable SN should be flushed from the reorder buffer for the TID. Accordingly, when a QoS data frame is received from an initiator STA, a receiver STA may flush a reorder buffer by: MSDUs transmitted via QoS data frames and having SNs lower than the highest scoutable SN are flushed from the reorder buffer for TID. For example, the receiving STA may flush out from the reorder buffer all MSDUs that are transmitted over QoS data frames and that have an SN that is lower than the highest scoutable SN.
In some embodiments, multiple MSDUs in a QoS data frame may have different TIDs. In this case, the TIDs may be divided into one or more groups of TIDs, and the control information may include the one or more groups of TIDs and one or more highest flushable SNs. Each highest scoutable SN may correspond to a set of one or more TIDs and indicate that MSDUs transmitted via QoS data frames and having SNs lower than the highest scoutable SN should be flushed from the reorder buffer for the set of one or more TIDs. For example, as shown in FIG. 4, the A-Ctrl field may include one or more control information subfields, each containing a TID set and corresponding highest scoutable SN. Accordingly, when a QoS data frame is received from an initiator STA, a receiver STA may flush a reorder buffer by: for each highest scoutable SN, all MSDUs transmitted via QoS data frames and having SNs below the highest scoutable SN are flushed from the reorder buffer for the set of one or more TIDs corresponding to the highest scoutable SN.
As described above, a reorder buffer at the receiver STA may be allocated per TID and per initiator STA. For a particular initiator STA, a reorder buffer at the recipient STA may be associated with one or more TIDs. Thus, in the present disclosure, a reorder buffer for a certain TID may indicate a reorder buffer allocated specifically for an MSDU with that TID.
Further, in some embodiments, the control information in the QoS data frame may include a buffer time threshold configured to indicate: once the period of time that an MSDU transmitted via a QoS data frame is held in the reorder buffer exceeds the buffer time threshold, the MSDU should be flushed from the reorder buffer. MSDUs that have been in the reorder buffer for a period of time exceeding the buffer time threshold may be referred to as expired MSDUs. In some embodiments, the buffer time threshold may be configured to further indicate that MSDUs transmitted via QoS data frames and having SNs that are lower than the SN of the sequence number of an expired MSDU should be flushed from the reorder buffer. Accordingly, the recipient STA may flush out the expired MSDUs from the reorder buffer as well as all MSDUs that were transmitted via QoS data frames and that have SNs that are lower than the SN of the expired MSDUs.
According to the above-described embodiments, control information associated with flushing of the reorder buffer at the receiver STA may be carried in the MAC header of the QoS data frame sent by the initiator STA. In addition to QoS data frames, the initiator STA may also send various management frames to the receiver STA to implement corresponding management functions, such as QoS management. For example, the initiator STA may send an SCS request frame to the receiver STA to enable high QoS data transmission. An initiator STA seeking SCS may send an SCS request frame to a receiver STA, the request frame including an identification of the requested SCS stream and a descriptor of the classification model. The receiver STA may classify the multimedia streams based on subjective rules directly defined by the initiator STA to establish a high QoS communication link between the initiator STA and the receiver STA for the requested SCS stream.
In some embodiments of the present disclosure, the initiator STA may generate a management frame including management information associated with flushing of the reorder buffer at the receiver STA and transmit the management frame to the receiver STA. Accordingly, the receiving STA may decode the management frame received from the originating STA and flush the reorder buffer based on the management information carried in the management frame.
The management information may include a maximum lifetime of the MSDU to be transmitted to the receiving STA. The maximum lifetime may be configured to indicate that an MSDU should be flushed from the reorder buffer once its lifetime exceeds the maximum lifetime. Upon receipt of a management frame from an initiator STA, a recipient STA may flush an MSDU from the reorder buffer once the lifetime of the MSDU exceeds a maximum lifetime.
Additionally or alternatively, the management information may include a buffer time threshold for indicating that an MSDU should be flushed from the reorder buffer once the period of time that the MSDU is held in the reorder buffer exceeds the buffer time threshold. Thus, upon receipt of a management frame from an initiator STA, a recipient STA may flush an MSDU from the reorder buffer once the period of time that the MSDU is held in the reorder buffer exceeds a buffer time threshold.
In some embodiments, the management frame may be an SCS request frame, which may include an identification of the requested SCS stream and a descriptor of the classification model. In this case, the management information carried in the SCS request frame may include a maximum lifetime of MSDUs belonging to the requested SCS stream, and the maximum lifetime is configured to indicate that MSDUs should be flushed from the reorder buffer once the lifetime of MSDUs transmitted via the requested SCS stream exceeds the maximum lifetime.
Additionally or alternatively, the management information carried in the SCS request frame may include a buffer time threshold for the SCS stream requested. The buffer time threshold may be configured to indicate that an MSDU transmitted via the requested SCS stream should be flushed from the reorder buffer once the period of time that the MSDU is held in the reorder buffer exceeds the buffer time threshold. The buffering time threshold may be less than or equal to a delay limit of the SCS stream requested, which may be specified in the SCS request frame. Accordingly, once the time period during which the MSDU transmitted via the requested SCS stream is held in the reorder buffer exceeds the buffer time threshold, the recipient STA may flush the MSDU from the reorder buffer.
Further, to illustrate the general concept of the proposed method for flushing a reorder buffer at a receiver STA, an example procedure associated with a reorder buffer flush will be described below with reference to fig. 5-8.
Fig. 5 illustrates a flowchart of an example process associated with a reorder buffer flush performed by an initiator STA, according to some embodiments of the present disclosure. As shown in fig. 5, the initiator STA may perform operations 510 and 520 to facilitate a reorder buffer flush at the receiver STA.
At operation 510, the initiator STA may generate a QoS data frame including control information associated with flushing of a reorder buffer at the receiver STA.
At operation 520, the initiator STA may transmit the QoS data frame to the receiver STA.
In some embodiments, the QoS data frame may include a MAC header and a plurality of MSDUs, and the MAC header may include an aggregation control field that carries control information. The plurality of MSDUs may have the same TID, and the control information may include a highest scoutable SN configured to indicate that MSDUs transmitted via QoS data frames and having SNs lower than the highest scoutable SN are to be flushed from the reorder buffer for the TID. Alternatively, the plurality of MSDUs may have different TIDs, and the control information may include one or more sets of TIDs and one or more highest-scoutable sequence numbers SN, each highest-scoutable SN corresponding to a set of one or more TIDs and configured to indicate that MSDUs transmitted via QoS data frames and having SNs lower than the highest-scoutable SN are to be flushed from the reorder buffer for the set of one or more TIDs.
Additionally or alternatively, the control information may include a buffer time threshold configured to indicate: once the period of time that an MSDU transmitted via a QoS data frame is held in the reorder buffer exceeds the buffer time threshold, the MSDU is flushed from the reorder buffer. MSDUs that have been in the reorder buffer for a period of time exceeding a buffer time threshold may be referred to as expired MSDUs, and the buffer time threshold is further configured to indicate that MSDUs that are transmitted via QoS data frames and that have SN that is lower than the SN of the sequence number of the expired MSDUs are to be flushed from the reorder buffer.
In some embodiments, the initiator STA may also generate a management frame including management information associated with flushing of the reorder buffer at the recipient STA; and transmits the management frame to the receiving STA. The management information may include a maximum lifetime of an MSDU to be transmitted to the recipient STA, and the maximum lifetime is configured to indicate that the MSDU is to be flushed from the reorder buffer once the lifetime of the MSDU exceeds the maximum lifetime. Additionally or alternatively, the management information may include a buffer time threshold configured to indicate: once the time period during which an MSDU is held in the reorder buffer exceeds the buffer time threshold, the MSDU is flushed from the reorder buffer.
In some embodiments, the management frame may be an SCS request frame. The management information may include a maximum lifetime of MSDUs belonging to the requested SCS stream, and the maximum lifetime is configured to indicate that MSDUs are to be flushed from the reorder buffer once the lifetime of MSDUs transmitted via the requested SCS stream exceeds the maximum lifetime. Additionally or alternatively, the management information may include a buffer time threshold for the requested SCS stream, and the buffer time threshold may be configured to indicate that MSDUs transmitted via the requested SCS stream are to be flushed from the reorder buffer once a period of time that the MSDUs are held in the reorder buffer exceeds the buffer time threshold. The buffering time threshold may be less than or equal to the delay limit of the SCS stream requested.
In some embodiments, the initiator STA may be one of one or more initiator STAs included in the initiator MLD, and the receiver STA may be one of one or more receiver STAs included in the receiver MLD.
Fig. 6 illustrates a flowchart of another example process associated with a reorder buffer flush performed by an initiator STA, according to some embodiments of the present disclosure. As shown in fig. 6, an initiator STA may perform operations 610 and 620 to facilitate a reorder buffer flush at a receiver STA.
At operation 610, the initiator STA may generate a management frame including management information associated with flushing of the reorder buffer at the receiver STA.
At operation 620, the initiator STA may transmit a management frame to the receiver STA.
In some embodiments, the management information may include a maximum lifetime of an MSDU to be transmitted to the recipient STA, and the maximum lifetime is configured to indicate that the MSDU is to be flushed from the reorder buffer once the lifetime of the MSDU exceeds the maximum lifetime. Additionally or alternatively, the management information may include a buffer time threshold configured to indicate: once the time period during which an MSDU is held in the reorder buffer exceeds the buffer time threshold, the MSDU is flushed from the reorder buffer.
In some embodiments, the management frame may be an SCS request frame. The management information may include a maximum lifetime of MSDUs belonging to the requested SCS stream, and the maximum lifetime is configured to indicate that MSDUs are to be flushed from the reorder buffer once the lifetime of MSDUs transmitted via the requested SCS stream exceeds the maximum lifetime. Additionally or alternatively, the management information may include a buffer time threshold for the requested SCS stream, and the buffer time threshold may be configured to indicate that MSDUs transmitted via the requested SCS stream are to be flushed from the reorder buffer once a period of time that the MSDUs are held in the reorder buffer exceeds the buffer time threshold. The buffering time threshold may be less than or equal to the delay limit of the SCS stream requested.
Fig. 7 illustrates a flowchart of an example process associated with a reorder buffer flush performed by a receiver STA, according to some embodiments of the present disclosure. As shown in fig. 7, the receiving STA may perform operations 710 and 720 to facilitate reorder buffer flushing at the receiving STA.
At operation 710, the receiver STA may decode the QoS data frame received from the initiator STA. The QoS data frame may include control information associated with flushing of a reorder buffer at the receiving STA.
At operation 720, the receiving STA may flush the reorder buffer based on the control information in the decoded QoS data frame.
In some embodiments, the QoS data frame may include a MAC header and a plurality of MSDUs, and the MAC header may include an aggregation control field that carries control information. Multiple MSDUs may have the same TID, the control information may include a highest scoutable SN, and the recipient STA may flush out MSDUs transmitted via QoS data frames and having SNs lower than the highest scoutable SN from the reorder buffer for that TID. Alternatively, the plurality of MSDUs may have different TIDs, the control information may include one or more sets of TIDs and one or more highest scoutable SNs, each highest scoutable SN corresponding to a set of one or more TIDs, and for each highest scoutable SN, the recipient STA may flush out MSDUs from the reorder buffer for the set of one or more TIDs corresponding to that highest scoutable SN that are transmitted via QoS data frames and have SNs lower than the highest scoutable SN.
Additionally or alternatively, the control information may include a buffer time threshold, and the recipient STA may flush MSDUs transmitted via QoS data frames from the reorder buffer once the period of time the MSDUs are held in the reorder buffer exceeds the buffer time threshold. MSDUs that have been in the reorder buffer for a period of time exceeding the buffer time threshold may be referred to as expired MSDUs, and the recipient STA may flush out of the reorder buffer MSDUs that are transmitted via QoS data frames and that have a SN that is lower than the SN of the expired MSDUs.
In some embodiments, the receiving STA may also decode a management frame received from the initiating STA, the management frame including management information associated with flushing of a reorder buffer at the receiving STA; and flushing the reorder buffer based on the management information in the decoded management frame. The management information may include a maximum lifetime of an MSDU to be transmitted to the recipient STA, and the recipient STA may flush the MSDU from the reorder buffer once the lifetime of the MSDU exceeds the maximum lifetime. Additionally or alternatively, the management information may include a buffer time threshold, and the recipient STA may flush the MSDUs from the reorder buffer once the period of time that the MSDUs are held in the reorder buffer exceeds the buffer time threshold.
In some embodiments, the management frame may be an SCS request frame. The management information may include a maximum lifetime of MSDUs belonging to the requested SCS stream, and the recipient STA may flush out the MSDUs from the reorder buffer once the lifetime of MSDUs transmitted via the requested SCS stream exceeds the maximum lifetime. Additionally or alternatively, the management information may include a buffer time threshold for the requested SCS stream, and the recipient STA may flush the MSDUs from the reorder buffer once the period of time that the MSDUs transmitted via the requested SCS stream are held in the reorder buffer exceeds the buffer time threshold. The buffering time threshold may be less than or equal to the delay limit of the SCS stream requested.
Fig. 8 illustrates a flowchart of another example process associated with reorder buffer flushing performed by a receiver STA, according to some embodiments of the present disclosure. As shown in fig. 8, a receiving STA may perform operations 810 and 820 to facilitate reorder buffer flushing at the receiving STA.
At operation 810, the receiver STA may decode the management frame received from the initiator STA. The management frame may include management information associated with flushing of the reorder buffer at the receiving STA.
At operation 820, the receiving STA may flush the reorder buffer based on the management information in the decoded management frame.
In some embodiments, the management information may include a maximum lifetime of the MSDU to be transmitted to the recipient STA, and the recipient STA may flush the MSDU from the reorder buffer once the lifetime of the MSDU exceeds the maximum lifetime. Additionally or alternatively, the management information may include a buffer time threshold, and the recipient STA may flush the MSDUs from the reorder buffer once the period of time that the MSDUs are held in the reorder buffer exceeds the buffer time threshold.
In some embodiments, the management frame may be an SCS request frame. The management information may include a maximum lifetime of MSDUs belonging to the requested SCS stream, and the recipient STA may flush out the MSDUs from the reorder buffer once the lifetime of MSDUs transmitted via the requested SCS stream exceeds the maximum lifetime. Additionally or alternatively, the management information may include a buffer time threshold for the requested SCS stream, and the recipient STA may flush the MSDUs from the reorder buffer once the period of time that the MSDUs transmitted via the requested SCS stream are held in the reorder buffer exceeds the buffer time threshold. The buffering time threshold may be less than or equal to the delay limit of the SCS stream requested.
Fig. 9 illustrates a functional diagram of an exemplary communication station 900 in accordance with one or more exemplary embodiments of the present disclosure. In one embodiment, fig. 9 illustrates a functional block diagram of a communication station that may be suitable for use as AP 102 (fig. 1) or user device 120 (fig. 1) in accordance with some embodiments. Communication station 900 may also be suitable for use as a handheld device, mobile device, cellular telephone, smart phone, tablet, netbook, wireless terminal, laptop, wearable computer device, femtocell, high Data Rate (HDR) subscriber station, access point, access terminal, or other Personal Communication System (PCS) device.
According to some embodiments, the communication circuitry 902 may be arranged to contend for the wireless medium and configure frames or packets for communication over the wireless medium. The communication circuit 902 may be arranged to transmit and receive signals. The communication circuitry 902 may also include circuitry for modulation/demodulation, up/down conversion, filtering, amplification, and the like. In some embodiments, the processing circuitry 906 of the communication station 900 may include one or more processors. In other embodiments, two or more antennas 901 may be coupled to a communication circuit 902 arranged for transmitting and receiving signals. Memory 908 may store information for configuring processing circuitry 906 to perform operations for configuring and transmitting message frames and for performing various operations described herein. Memory 908 may include any type of memory, including non-transitory memory, for storing information in a form readable by a machine (e.g., a computer). For example, memory 908 may include computer-readable storage devices, read-only memory (ROM), random Access Memory (RAM), magnetic disk storage media, optical storage media, flash memory devices, and other storage devices and media.
In some embodiments, communication station 900 may be part of a portable wireless communication device such as a Personal Digital Assistant (PDA), a laptop or portable computer with wireless communication capability, a web tablet, a wireless telephone, a smart phone, a wireless headset, a pager, an instant messaging device, a digital camera, an access point, a television, a medical device (e.g., a heart rate monitor, a blood pressure monitor, etc.), a wearable computer device, or other device that may receive and/or transmit information wirelessly.
In some embodiments, communication station 900 may include one or more antennas 901. Antenna 901 may include one or more directional or omnidirectional antennas, including, for example, dipole antennas, monopole antennas, patch antennas, loop antennas, microstrip antennas or other types of antennas suitable for transmission of RF signals. In some embodiments, a single antenna with multiple apertures may be used instead of two or more antennas. In these embodiments, each aperture may be considered a separate antenna. In some multiple-input multiple-output (MIMO) embodiments, the antennas may be effectively separated for spatial diversity and different channel characteristics that may occur between each antenna and the antennas of the transmitting station.
In some embodiments, communication station 900 may include one or more of a keyboard, a display, a non-volatile memory port, multiple antennas, a graphics processor, an application processor, speakers, and other mobile device elements. The display may be an LCD screen including a touch screen.
Although communication station 900 is illustrated as having several separate functional elements, two or more of the functional elements may be combined and may be implemented by combinations of software-configured elements, such as processing elements including Digital Signal Processors (DSPs), and/or other hardware elements. For example, some elements may comprise one or more microprocessors, DSPs, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), radio Frequency Integrated Circuits (RFICs), and combinations of various hardware and logic circuitry for implementing at least the functions described herein. In some embodiments, the functional elements of communication station 900 may refer to one or more processes operating on one or more processing elements.
Some embodiments may be implemented in one or a combination of hardware, firmware, and software. Other embodiments may also be implemented as instructions stored on a computer-readable storage device, which may be read and executed by at least one processor to perform the operations described herein. A computer-readable storage device may include any non-transitory memory mechanism for storing information in a form readable by a machine (e.g., a computer). For example, computer-readable storage devices may include read-only memory (ROM), random-access memory (RAM), magnetic disk storage media, optical storage media, flash memory devices, and other storage devices and media. In some embodiments, communication station 900 may include one or more processors and may be configured with instructions stored on a computer-readable storage device.
Fig. 10 illustrates a block diagram of an example of a machine 1000 or system on which any one or more of the techniques (e.g., methods) discussed herein may be performed. In other embodiments, machine 1000 may operate as a stand-alone device or may be connected (e.g., networked) to other machines. In a networked deployment, the machine 1000 may operate in the capacity of a server machine, a client machine, or both, in a server-client network environment. In an example, machine 1000 may act as a peer machine in a peer-to-peer (P2P) (or other distributed) network environment. Machine 1000 may be a Personal Computer (PC), a tablet PC, a set-top box (STB), a Personal Digital Assistant (PDA), a mobile telephone, a wearable computer device, a network router, switch or bridge, or any machine capable of executing instructions (sequential or otherwise) that specify actions to be taken by that machine (e.g., base station). Furthermore, while only a single machine is illustrated, the term "machine" shall also be taken to include any collection of machines that individually or jointly execute a set (or multiple sets) of instructions to perform any one or more of the methodologies discussed herein, such as cloud computing, software as a service (SaaS), or other computer cluster configurations.
Examples may include or may operate on logic or multiple components, modules, or mechanisms as described herein. A module is a tangible entity (e.g., hardware) capable of performing specified operations when operated on. The modules include hardware. In one example, the hardware may be specifically configured to perform certain operations (e.g., hardwired). In another example, hardware may include configurable execution units (e.g., transistors, circuits, etc.) and computer-readable media containing instructions that configure the execution units to perform particular operations at runtime. Configuration may occur under the direction of an execution unit or a loading mechanism. Thus, when the device is running, the execution unit is communicatively coupled to the computer readable medium. In this example, the execution unit may be a member of more than one module. For example, in operation, the execution unit may be configured by a first set of instructions to implement a first module at one point in time and reconfigured by a second set of instructions to implement a second module at a second point in time.
The machine (e.g., computer system) 1000 may include a hardware processor 1002 (e.g., a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a hardware processor core, or any combination thereof), a main memory 1004, and a static memory 1006, some or all of which may communicate with each other via an interconnection link (e.g., bus) 1008. The machine 1000 may also include a power management device 1032, a graphical display device 1010, an alphanumeric input device 1012 (e.g., a keyboard), and a User Interface (UI) navigation device 1014 (e.g., a mouse). In an example, the graphical display device 1010, the alphanumeric input device 1012, and the UI navigation device 1014 may be a touch screen display. Machine 1000 may also include a storage device (i.e., drive unit) 1016, a signal generating device 1018 (e.g., a speaker), a lightweight flush device 1019, a network interface device/transceiver 1020 coupled to an antenna 1030, and one or more sensors 1028, such as a Global Positioning System (GPS) sensor, compass, accelerometer, or other sensor. Machine 1000 can include an output controller 1034, such as a serial (e.g., universal Serial Bus (USB)), parallel, or other wired or wireless (e.g., infrared (IR), near Field Communication (NFC), etc.) connection to communicate with or control one or more peripheral devices (e.g., printer, card reader, etc.). Operations according to one or more example embodiments of the present disclosure may be performed by a baseband processor. The baseband processor may be configured to generate a corresponding baseband signal. The baseband processor may also include physical layer (PHY) and medium access control layer (MAC) circuitry and may further interface with the hardware processor 1002 for generation and processing of baseband signals and for controlling the operation of the main memory 1004, memory device 1016, and/or lightweight flush device 1019. The baseband processor may be provided on a single radio card, a single chip or an Integrated Circuit (IC).
The storage device 1016 may include a machine-readable medium 1022 on which is stored one or more sets of data structures or instructions 1024 (e.g., software) embodying or utilized by any one or more of the techniques or functions described herein. The instructions 1024 may also reside, completely or at least partially, within the main memory 1004, within the static memory 1006, or within the hardware processor 1002 during execution thereof by the machine 1000. In an example, one or any combination of the hardware processor 1002, the main memory 1004, the static memory 1006, or the storage device 1016 may constitute machine-readable media.
The lightweight flush device 1019 may perform or implement any of the operations and processes described and illustrated above.
It should be appreciated that the above are just a subset of the functions that the lightweight flush device 1019 may be configured to perform, and that other functions included throughout this disclosure may also be performed by the lightweight flush device 1019.
While the machine-readable medium 1022 is illustrated as a single medium, the term "machine-readable medium" may include a single medium or multiple media (e.g., a centralized or distributed database, and/or associated caches and servers) configured to store the one or more instructions 1024.
Various embodiments may be implemented in whole or in part in software and/or firmware. The software and/or firmware may take the form of instructions contained in or on a non-transitory computer-readable storage medium. These instructions may then be read and executed by one or more processors to enable performance of the operations described herein. The instructions may be in any suitable form, such as, but not limited to, source code, compiled code, interpreted code, executable code, static code, dynamic code, and the like. Such computer-readable media can include any tangible, non-transitory media for storing information in one or more computer-readable forms, such as, but not limited to, read Only Memory (ROM); random Access Memory (RAM); a magnetic disk storage medium; an optical storage medium; flash memory, etc.
The term "machine-readable medium" can include any medium that can store, encode, or carry instructions for execution by the machine 1000 and that cause the machine 1000 to perform any one or more of the techniques of the present disclosure, or that can store, encode, or carry data structures for use by or associated with such instructions. Non-limiting examples of machine readable media may include solid state memory, optical and magnetic media. In one example, a number of machine-readable media include machine-readable media having a plurality of particles with a stationary mass. Specific examples of a mass machine readable medium may include non-volatile memory, such as semiconductor memory devices (e.g., electrically programmable read-only memory (EPROM) or electrically erasable programmable read-only memory (EEPROM)) and flash memory devices; magnetic disks, such as internal hard disks and removable disks; magneto-optical disk; CD-ROM and DVD-ROM discs.
The instructions 1024 may also be transmitted or received over a communication network 1026 using a transmission medium through the network interface device/transceiver 1020 using any of a variety of transmission protocols (e.g., frame relay, internet Protocol (IP), transmission Control Protocol (TCP), user Datagram Protocol (UDP), hypertext transfer protocol (HTTP), etc.). Example communication networks may include a Local Area Network (LAN), a Wide Area Network (WAN), a packet data network (e.g., the internet), a mobile telephone network (e.g., a cellular network), a Plain Old Telephone (POTS) network, a wireless data network (e.g., institute of Electrical and Electronics Engineers (IEEE) 802.11 family of standards, referred to as
IEEE 802.16 family of standards, called +.>
) IEEE 802.15.4 family of standards, peer-to-peer (P2P) networks, etc. In an example, the network interface device/transceiver 1020 may include one or more physical insertsHoles (e.g., ethernet, coaxial, or telephone jacks) or one or more antennas to connect to the communications network 1026. In an example, the network interface device/transceiver 1020 may include multiple antennas to wirelessly communicate using at least one of single-input multiple-output (SIMO), multiple-input multiple-output (MIMO), or multiple-input single-output (MISO) technologies. The term "transmission medium" shall be taken to include any intangible medium that is capable of storing, encoding or carrying instructions for execution by the machine 1000, and includes digital or analog communications signals or other intangible medium to facilitate communication of such software.
The operations and processes described and illustrated above may be performed or implemented in any suitable order as desired in various embodiments. Further, in some embodiments, at least a portion of the operations may be performed in parallel. Further, in some embodiments, fewer or more operations than those described may be performed.
Fig. 11 is a block diagram of a radio architecture 105A, 105B in accordance with some embodiments that may be implemented in any of the example AP 102 and/or the example STA 120 of fig. 1. The radio architecture 105A, 105B may include radio Front End Module (FEM) circuits 1104a-B, radio IC circuits 1106a-B, and baseband processing circuits 1108a-B. The illustrated radio architecture 105A, 105B includes Wireless Local Area Network (WLAN) functionality and Bluetooth (BT) functionality, but the embodiments are not so limited. In this disclosure, "WLAN" and "Wi-Fi" are used interchangeably.
The illustrated radio IC circuits 1106a-b may include a WLAN radio IC circuit 1106a and a BT radio IC circuit 1106b. The WLAN radio IC circuit 1106a may include a receive signal path, which may include circuitry for down-converting WLAN RF signals received from the FEM circuit 1104a and providing baseband signals to the WLAN baseband processing circuit 1108 a. The BT radio IC circuit 1106b may in turn comprise a receive signal path, which may comprise circuitry for down-converting the BT RF signal received from the FEM circuit 1104b and providing a baseband signal to the BT baseband processing circuit 1108 b. The WLAN radio IC circuit 1106a may also include a transmit signal path, which may include circuitry for up-converting the WLAN baseband signal provided by the WLAN baseband processing circuit 1108a and providing a WLAN RF output signal to the FEM circuit 1104a for subsequent wireless transmission by the one or more antennas 1101. The BT radio IC circuit 1106b may also include a transmit signal path, which may include circuitry for up-converting the BT baseband signal provided by the BT baseband processing circuit 1108b and providing a BT RF output signal to the FEM circuit 1104b for subsequent wireless transmission by the one or more antennas 1101. In fig. 11, although the radio IC circuits 1106a and 1106b are shown as being different from each other, the embodiment is not limited thereto, and includes within their scope the use of a radio IC circuit (not shown) that includes a transmission signal path and/or a reception signal path for both WLAN and BT signals, or the use of one or more radio IC circuits, at least some of which share a transmission and/or reception signal path for both WLAN and BT signals.
Still referring to fig. 11, according to the illustrated embodiment, the WLAN-BT coexistence circuit 1113 may include logic to provide an interface between the WLAN baseband circuit 1108a and the BT baseband circuit 1108b to implement use cases requiring WLAN and BT coexistence. Further, a switch 1103 may be provided between the WLAN FEM circuitry 1104a and the BT FEM circuitry 1104b to allow switching between WLAN and BT radio depending on the application needs. Further, while antenna 1101 is depicted as being connected to WLAN FEM circuitry 1104a and BT FEM circuitry 1104b, respectively, embodiments include within their scope sharing one or more antennas between WLAN and BT FEM, or providing more than one antenna connection to each FEM 1104a or 1104b.
In some embodiments, front-end module circuits 1104a-b, radio IC circuits 1106a-b, and baseband processing circuits 1108a-b may be provided on a single radio card, such as radio card 1102. In other embodiments, one or more of the antenna 1101, FEM circuitry 1104a-b, and radio IC circuitry 1106a-b may be provided on a single radio card. In some other embodiments, the radio IC circuits 1106a-b and baseband processing circuits 1108a-b may be provided on a single chip or Integrated Circuit (IC), such as IC 1112.
In some embodiments, radio card 1102 may comprise a WLAN radio card and may be configured for Wi-Fi communication, although the scope of the embodiments is not limited in this respect. In some of these embodiments, the radio architecture 105A, 105B may be configured to receive and transmit Orthogonal Frequency Division Multiplexed (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) communication signals over a multicarrier communication channel. The OFDM or OFDMA signal may include a plurality of orthogonal subcarriers.
In some of these multi-carrier embodiments, the radio architecture 105A, 105B may be part of a Wi-Fi communication Station (STA), such as a wireless Access Point (AP), a base station, or a mobile device that includes a Wi-Fi device. In some of these embodiments, radio architecture 105A, 105B may be configured to transmit and receive signals according to particular communication standards and/or protocols, such as any Institute of Electrical and Electronics Engineers (IEEE) standard, including 802.11n-2009, IEEE 802.11-2012, IEEE 802.11-2016, 802.11n-2009, 802.11ac, 802.11ah, 802.11ad, 802.11ay, and/or 802.11ax standards, and/or the proposed WLAN specification, although the scope of the embodiments is not limited in this respect. The radio architecture 105A, 105B may also be adapted to transmit and/or receive communications in accordance with other techniques and standards.
In some embodiments, the radio architecture 105A, 105B may be configured for high-efficiency Wi-Fi (HEW) communications in accordance with the IEEE 802.11ax standard. In these embodiments, the radio architectures 105A, 105B may be configured to communicate in accordance with OFDMA techniques, although the scope of the embodiments is not limited in this respect.
In some other embodiments, the radio architecture 105A, 105B may be configured to transmit and receive signals transmitted using one or more other modulation techniques, such as spread spectrum modulation (e.g., direct sequence code division multiple access (DS-CDMA) and/or frequency hopping code division multiple access (FH-CDMA)), time Division Multiplexing (TDM) modulation, and/or Frequency Division Multiplexing (FDM) modulation, although the scope of the embodiments is not limited in this respect.
In some embodiments, as further shown in fig. 6, BT baseband circuit 1108b may conform to a Bluetooth (BT) connection standard, such as bluetooth, bluetooth 8.0, or bluetooth 6.0, or any other iteration of the bluetooth standard.
In some embodiments, the radio architecture 105A, 105B may include other radio cards, such as cellular radio cards configured for cellular (e.g., 5GPP such as LTE, LTE-Advanced, or 7G communications).
In some IEEE 802.11 embodiments, the radio architecture 105A, 105B may be configured for communication over various channel bandwidths, including bandwidths having a center frequency of approximately 900MHz, 2.4GHz, 5GHz, and bandwidths of approximately 2MHz, 4MHz, 5MHz, 5.5MHz, 6MHz, 8MHz, 10MHz, 20MHz, 40MHz, 80MHz (with continuous bandwidth), or 80+80MHz (160 MHz) (with discontinuous bandwidth). In some embodiments, a channel bandwidth of 920MHz may be used. However, the scope of the embodiments is not limited to the center frequency described above.
Fig. 12 illustrates a WLAN FEM circuit 1104a according to some embodiments. Although the example of fig. 12 is described in connection with WLAN FEM circuit 1104a, the example of fig. 12 may be described in connection with example BT FEM circuit 1104b (fig. 11), although other circuit configurations may be suitable.
In some embodiments, FEM circuitry 1104a may include TX/RX switch 1202 to switch between transmit and receive mode operation. FEM circuitry 1104a may include a receive signal path and a transmit signal path. The receive signal path of FEM circuitry 1104a may include a Low Noise Amplifier (LNA) 1206 to amplify received RF signal 1203 and provide amplified received RF signal 1207 as an output (e.g., to radio IC circuitry 1106a-b (fig. 11)). The transmit signal path of circuit 1104a may include a Power Amplifier (PA) to amplify the input RF signal 1209 (e.g., provided by radio IC circuits 1106 a-b), and one or more filters 1212, such as a band-pass filter (BPF), a low-pass filter (LPF), or other type of filter, to generate an RF signal 1215 for subsequent transmission via an example duplexer 1214 (e.g., by one or more antennas 1101 (fig. 11)).
In some dual-mode embodiments for Wi-Fi communication, FEM circuitry 1104a may be configured to operate in the 2.4GHz spectrum or the 5GHz spectrum. In these embodiments, the receive signal path of FEM circuitry 1104a may include a receive signal path diplexer 1204 to separate signals from each spectrum and to provide a separate LNA 1206 for each spectrum, as shown. In these embodiments, the transmit signal path of FEM circuitry 1104a may also include a power amplifier 1210 and a filter 1212, such as a BPF, LPF, or other type of filter for each spectrum, and a transmit signal path diplexer 1204 to provide signals of one of the different spectrums onto a single transmit path for subsequent transmission by one or more antennas 1101 (fig. 11). In some embodiments, BT communication may utilize a 2.4GHz signal path and may utilize the same FEM circuitry 1104a as used for WLAN communication.
Fig. 13 illustrates a radio IC circuit 1106a according to some embodiments. The radio IC circuit 1106a is one example of a circuit that may be suitable for use as a WLAN or BT radio IC circuit 1106a/1106b (fig. 11), but other circuit configurations may also be suitable. Alternatively, the example of fig. 13 may be described in connection with the example BT radio IC circuit 1106 b.
In some embodiments, the radio IC circuit 1106a may include a receive signal path and a transmit signal path. The receive signal path of the radio IC circuit 1106a may include at least a mixer circuit 1302, such as a down-conversion mixer circuit, an amplifier circuit 1306, and a filter circuit 1308. The transmit signal path of the radio IC circuit 1106a may include at least a filter circuit 1312 and a mixer circuit 1314, such as an up-conversion mixer circuit. The radio IC circuit 1106a may also include a synthesizer circuit 1304 for synthesizing a frequency 1305 for use by the mixer circuit 1302 and the mixer circuit 1314. According to some embodiments, mixer circuits 1302 and/or 1314, respectively, may be configured to provide direct conversion functionality. The latter type of circuit presents a simpler architecture than standard superheterodyne mixer circuits and can mitigate any flicker noise brought by it by e.g. using OFDM modulation. Fig. 13 shows only a simplified version of the radio IC circuit, and may include (although not shown) embodiments in which each depicted circuit may include more than one component. For example, the mixer circuits 1314 may each include one or more mixers, and the filter circuits 1308 and/or 1312 may each include one or more filters, such as one or more BPFs and/or LPFs, as desired for the application. For example, when the mixer circuits are of the direct conversion type, they may each include two or more mixers.
In some embodiments, mixer circuit 1302 may be configured to down-convert RF signal 1207 received from FEM circuits 1104a-b (FIG. 11) based on a synthesized frequency 1305 provided by synthesizer circuit 1304. The amplifier circuit 1306 may be configured to amplify the down-converted signal and the filter circuit 1308 may include an LPF configured to remove unwanted signals from the down-converted signal to generate the output baseband signal 1307. The output baseband signal 1307 may be provided to baseband processing circuits 1108a-b (fig. 11) for further processing. In some embodiments, the output baseband signal 1307 may be a zero frequency baseband signal, although this is not required. In some embodiments, mixer circuit 1302 may comprise a passive mixer, although the scope of the embodiments is not limited in this respect.
In some embodiments, mixer circuit 1314 may be configured to up-convert input baseband signal 1311 based on a synthesized frequency 1305 provided by synthesizer circuit 1304 to generate RF output signals 1209 for FEM circuits 1104 a-b. The baseband signal 1311 may be provided by baseband processing circuits 1108a-b and may be filtered by filter circuit 1312. The filter circuit 1312 may include an LPF or BPF, although the scope of the embodiments is not limited in this respect.
In some embodiments, the mixer circuit 1302 and mixer circuit 1314 may each include two or more mixers, and may be arranged for quadrature down-conversion and/or up-conversion, respectively, with the aid of the synthesizer 1304. In some embodiments, mixer circuit 1302 and mixer circuit 1314 may each include two or more mixers, each configured for image rejection (e.g., hartley image rejection). In some embodiments, mixer circuit 1302 and mixer circuit 1314 may be arranged for direct down-conversion and/or direct up-conversion, respectively. In some embodiments, mixer circuit 1302 and mixer circuit 1314 may be configured for superheterodyne operation, although this is not required.
According to one embodiment, the mixer circuit 1302 may include: quadrature passive mixers (e.g., for in-phase (I) and quadrature-phase (Q) paths). In such an embodiment, the RF input signal 1207 from fig. 13 may be down-converted to provide I and Q baseband output signals to be sent to the baseband processor.
The quadrature passive mixer may be driven by zero and ninety degree time-varying LO switching signals provided by a quadrature circuit that may be configured to receive an LO frequency (fLO) from a local oscillator or synthesizer, such as LO frequency 1305 of synthesizer 1304 (fig. 13). In some embodiments, the LO frequency may be a carrier frequency, while in other embodiments, the LO frequency may be a portion of the carrier frequency (e.g., one-half of the carrier frequency, one-third of the carrier frequency). In some embodiments, zero and ninety degree time-varying switching signals may be generated by a synthesizer, although the scope of the embodiments is not limited in this respect.
In some embodiments, the LO signal may differ in duty cycle (the percentage of the LO signal that is high in one cycle) and/or offset (the difference between the starting points of the cycles). In some embodiments, the LO signal may have a duty cycle of 85% and an offset of 80%. In some embodiments, each branch of the mixer circuit (e.g., the in-phase (I) and quadrature-phase (Q) paths) may operate at a duty cycle of 80%, which may result in a significant reduction in power consumption.
RF input signal 1207 (fig. 12) may comprise a balanced signal, although the scope of the embodiments is not limited in this respect. The I and Q baseband output signals may be provided to a low noise amplifier, such as amplifier circuit 1306 (fig. 13) or filter circuit 1308 (fig. 13).
In some embodiments, output baseband signal 1307 and input baseband signal 1311 may be analog baseband signals, although the scope of the embodiments is not limited in this respect. In some alternative embodiments, the output baseband signal 1307 and the input baseband signal 1311 may be digital baseband signals. In these alternative embodiments, the radio IC circuit may include an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC) circuit.
In some dual mode embodiments, separate radio IC circuits may be provided to process signals of each spectrum, or for other spectrums not mentioned herein, although the scope of the embodiments is not limited in this respect.
In some embodiments, synthesizer circuit 1304 may be a fractional-N synthesizer or a fractional-N/n+1 synthesizer, although the scope of the embodiments is not limited in this respect as other types of frequency synthesizers may be suitable. For example, synthesizer circuit 1304 may be a delta-sigma synthesizer, a frequency multiplier, or a synthesizer including a phase locked loop with a frequency divider. According to some embodiments, synthesizer circuit 1304 may include a digital synthesizer circuit. One advantage of using a digital synthesizer circuit is that while it may still contain some analog components, its footprint may be much smaller than that of an analog synthesizer circuit. In some embodiments, the frequency input to synthesizer circuit 1304 may be provided by a Voltage Controlled Oscillator (VCO), although this is not required. The divider control input may further be provided by baseband processing circuits 1108a-b (fig. 11), depending on the desired output frequency 1305. In some embodiments, the divider control input (e.g., N) may be determined from a lookup table (e.g., within a Wi-Fi card) based on the channel number and channel center frequency determined or indicated by the example application processor 1110. The application processor 1110 may include or otherwise be connected to one of the example security signal converter 101 or the example receive signal converter 103 (e.g., depending on in which device the example radio architecture is implemented).
In some embodiments, synthesizer circuit 1304 may be configured to generate the carrier frequency as output frequency 1305, while in other embodiments, output frequency 1305 may be a fraction of the carrier frequency (e.g., one-half of the carrier frequency, one-third of the carrier frequency). In some embodiments, the output frequency 1305 may be an LO frequency (fLO).
Fig. 14 illustrates a functional block diagram of baseband processing circuit 1108a, according to some embodiments. Baseband processing circuit 1108a is one example of a circuit that may be suitable for use as baseband processing circuit 1108a (fig. 11), although other circuit configurations may also be suitable. Alternatively, the example of fig. 13 may be used to implement the example BT baseband processing circuit 1108b of fig. 11.
In some embodiments (e.g., when exchanging analog baseband signals between baseband processing circuits 1108a-b and radio IC circuits 1106 a-b), baseband processing circuit 1108a may include ADC1410 to convert analog baseband signals 1409 received from radio IC circuits 1106a-b to digital baseband signals for processing by RX BBP 1402. In these embodiments, baseband processing circuit 1108a may also include a DAC 1412 to convert the digital baseband signal from TX BBP 1404 to an analog baseband signal 1411.
In some embodiments, such as transmitting an OFDM signal or an OFDMA signal through baseband processor 1108a, transmit baseband processor 1404 may be configured to generate an OFDM or OFDMA signal suitable for transmission by performing an Inverse Fast Fourier Transform (IFFT). The receive baseband processor 1402 may be configured to process a received OFDM signal or OFDMA signal by performing an FFT. In some embodiments, receive baseband processor 1402 may be configured to detect the presence of an OFDM signal or an OFDMA signal by performing autocorrelation to detect a preamble such as a short preamble and to detect a long preamble by performing cross-correlation. The preamble may be part of a predetermined frame structure for Wi-Fi communication.
Referring back to fig. 11, in some embodiments, antennas 1101 (fig. 11) may each include one or more directional or omnidirectional antennas, including, for example, dipole antennas, monopole antennas, patch antennas, loop antennas, microstrip antennas or other types of suitable antennas for transmission of radio frequency signals. In some multiple-input multiple-output (MIMO) embodiments, the antennas may be effectively separated to take advantage of spatial diversity and the different channel characteristics that may result. The antennas 1101 may each include a set of phased array antennas, but the embodiment is not limited thereto.
Although the radio architecture 105A, 105B is shown as having several separate functional elements, one or more of the functional elements may be combined and may be implemented by combinations of software-configured elements, such as processing elements including Digital Signal Processors (DSPs), and/or other hardware elements. For example, some elements may comprise one or more microprocessors, DSPs, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), radio Frequency Integrated Circuits (RFICs), and combinations of various hardware and logic circuitry for performing at least the functions described herein. In some embodiments, a functional element may refer to one or more processes operating on one or more processing elements.
The term "exemplary" is used herein to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The terms "computing device," "user device," "communication station," "handheld device," "mobile device," "wireless device," and "user device" (UE) as used herein refer to a wireless communication device, such as a cellular telephone, smart phone, tablet, netbook, wireless terminal, laptop computer, femtocell, high Data Rate (HDR) subscriber station, access point, printer, point-of-sale device, access terminal, or other Personal Communication System (PCS) device. The device may be mobile or stationary.
As used in this document, the term "communication" is intended to include transmission or reception, or both transmission and reception. This may be particularly useful in the claims when describing the organization of data transmitted by one device and received by another device, but only requiring the function of one of these devices would violate the claim. Similarly, a two-way exchange of data between two devices (two devices that transmit and receive during an exchange) may be described as "communication" when only the functionality of one of the devices is required. The term "communication" as used herein with respect to a wireless communication signal includes transmitting a wireless communication signal and/or receiving a wireless communication signal. For example, a wireless communication unit capable of transmitting wireless communication signals may include a wireless transmitter that transmits wireless communication signals to at least one other wireless communication unit, and/or a wireless communication receiver that receives wireless communication signals from at least one other wireless communication unit.
As used herein, unless otherwise indicated, the use of ordinal adjectives "first," "second," "third," etc., to describe a common object, merely indicate different instances of like objects being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.
The term "access point" (AP) as used herein may be a fixed station. An access point may also be referred to as an access node, a base station, an evolved node B (eNodeB), or some other similar terminology known in the art. An access terminal may also be referred to as a mobile station, user Equipment (UE), wireless communication device, or some other similar terminology known in the art. Embodiments disclosed herein relate generally to wireless networks. Some embodiments may relate to wireless networks operating in accordance with one of the IEEE 802.11 standards.
Some embodiments may be used in conjunction with various devices and systems, such as Personal Computers (PCs), desktop computers, mobile computers, laptop computers, notebook computers, tablet computers, server computers, handheld devices, personal Digital Assistant (PDA) devices, handheld PDA devices, in-vehicle devices, off-vehicle devices, hybrid devices, in-vehicle devices, off-vehicle devices, mobile or portable devices, consumer devices, non-mobile or non-portable devices, wireless communication stations, wireless communication devices, wireless Access Points (APs), wired or wireless routers, wired or wireless modems, video devices, audio-video (a/V) devices, wired or wireless networks, wireless local area networks, wireless Video Area Networks (WVAN), local Area Networks (LANs), wireless Local Area Networks (WLANs), personal Area Networks (PANs), wireless PANs (WPANs), and the like.
Some embodiments may be used in conjunction with the following systems or devices: a unidirectional and/or bidirectional radio communication system, a cellular radio-telephone communication system, a mobile telephone, a cellular telephone, a wireless telephone, a Personal Communication System (PCS) device, a PDA device containing a wireless communication device, a mobile or portable Global Positioning System (GPS) device, a device containing a GPS receiver or transceiver or chip, a device containing an RFID element or chip, a multiple-input multiple-output (MIMO) transceiver or device, a single-input multiple-output (SIMO) transceiver or device, a multiple-input single-output (MISO) transceiver or device, a device having one or more internal and/or external antennas, a Digital Video Broadcasting (DVB) device or system, a multi-standard radio device or system, a wired or wireless handheld device (e.g., a smart phone), a Wireless Application Protocol (WAP) device, etc.
Some embodiments may be used in conjunction with one or more types of wireless communication signals and/or systems that conform to one or more wireless communication protocols, such as, for example, radio Frequency (RF), infrared (IR), frequency Division Multiplexing (FDM), orthogonal FDM (OFDM), time Division Multiplexing (TDM), time Division Multiple Access (TDMA), spread TDMA (E-TDMA), general Packet Radio Service (GPRS), spread GPRS, code Division Multiple Access (CDMA), wideband CDMA (WCDMA), CDMA2000, single carrier CDMA, multi-carrier modulation (MDM), discrete Multitone (DMT), and the like, 
Global Positioning System (GPS), wi-Fi, wi-Max, zigBee, ultra Wideband (UWB), global system for mobile communications (GSM), 2G, 2.5G, 3G, 3.5G, 4G, fifth generation (5G) mobile networks, 3GPP, long Term Evolution (LTE), LTE advanced, enhanced data rates for GSM evolution (EDGE), and the like. Other embodiments may be used in various other devices, systems, and/or networks.
The following paragraphs describe examples of various embodiments.
Example 1 includes an apparatus for an initiator station STA, comprising: an interface circuit; and processing circuitry coupled with the interface circuitry and configured to: generating a quality of service, qoS, data frame comprising control information associated with flushing of a reorder buffer at a receiver STA; and providing the QoS data frame to the interface circuit for transmission to the recipient STA.
Example 2 includes the apparatus of example 1, wherein the QoS data frame comprises a medium access control, MAC, header and a plurality of MAC service data units, MSDUs, and the MAC header comprises an aggregation control field carrying the control information.
Example 3 includes the apparatus of example 2, wherein the plurality of MSDUs have the same traffic identifier TID, and the control information includes a highest flushable sequence number SN configured to indicate that MSDUs transmitted via the QoS data frame and having SNs lower than the highest flushable SN are to be flushed from a reorder buffer for the TID.
Example 4 includes the apparatus of example 2, wherein the plurality of MSDUs have different traffic identifiers TIDs, and the control information includes one or more sets of TIDs and one or more highest-scoutable sequence numbers SN, each highest-scoutable SN corresponding to a set of one or more TIDs, and configured to indicate that MSDUs transmitted via the QoS data frames and having SNs lower than the highest-scoutable SN are to be flushed from a reorder buffer for the set of one or more TIDs.
Example 5 includes the apparatus of any one of examples 1-4, wherein the control information includes a buffer time threshold configured to indicate: once the time period during which a medium access control MAC service data unit MSDU transmitted via the QoS data frame is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 6 includes the apparatus of example 5, wherein the MSDU that has been in the reorder buffer for a period of time exceeding the buffer time threshold is an expired MSDU, and the buffer time threshold is further configured to indicate that an MSDU transmitted via the QoS data frame and having a SN that is lower than a SN of the expired MSDU is to be flushed from the reorder buffer.
Example 7 includes the apparatus of any one of examples 1-4, wherein the processing circuit is further configured to: generating a management frame including management information associated with flushing of the reorder buffer at the receiver STA; and providing the management frame to the interface circuit for transmission to the recipient STA.
Example 8 includes the apparatus of example 7, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, to be transmitted to the recipient STA, and the maximum lifetime is configured to indicate that an MSDU is to be flushed from the reorder buffer once the lifetime of the MSDU exceeds the maximum lifetime.
Example 9 includes the apparatus of example 7, wherein the management information includes a buffer time threshold configured to indicate: once the time period during which a medium access control MAC service data unit MSDU is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 10 includes the apparatus of example 7, wherein the management frame is a stream classification service SCS request frame.
Example 11 includes the apparatus of example 10, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, belonging to the requested SCS flow, and the maximum lifetime is configured to indicate that an MSDU is to be flushed from the reorder buffer once a lifetime of the MSDU transmitted via the requested SCS flow exceeds the maximum lifetime.
Example 12 includes the apparatus of example 10, wherein the management information includes a buffer time threshold for the requested SCS stream, and the buffer time threshold is configured to indicate that a medium access control MAC service data unit MSDU transmitted via the requested SCS stream is to be flushed from the reorder buffer once a period of time during which the MSDU is held in the reorder buffer exceeds the buffer time threshold.
Example 13 includes the apparatus of example 12, wherein the buffering time threshold is less than or equal to a delay limit of the requested SCS stream.
Example 14 includes the apparatus of any one of examples 1-13, wherein the initiator STA is one of one or more initiator STAs included in the initiator MLD, and the receiver STA is one of one or more receiver STAs included in the receiver MLD.
Example 15 includes a method for an initiator station STA, comprising: generating a quality of service, qoS, data frame comprising control information associated with flushing of a reorder buffer at a receiver STA; and transmitting the QoS data frame to the receiving STA.
Example 16 includes the method of example 15, wherein the QoS data frame includes a medium access control, MAC, header and a plurality of MAC service data units, MSDUs, and the MAC header includes an aggregation control field that carries the control information.
Example 17 includes the method of example 16, wherein the plurality of MSDUs have the same traffic identifier TID, and the control information includes a highest flushable sequence number SN configured to indicate that MSDUs transmitted via the QoS data frame and having SNs lower than the highest flushable SN are to be flushed from a reorder buffer for the TID.
Example 18 includes the method of example 16, wherein the plurality of MSDUs have different traffic identifiers TIDs, and the control information includes one or more sets of TIDs and one or more highest-scoutable sequence numbers SN, each highest-scoutable SN corresponding to a set of one or more TIDs, and configured to indicate that MSDUs transmitted via the QoS data frames and having SNs lower than the highest-scoutable SN are to be flushed from a reorder buffer for the set of one or more TIDs.
Example 19 includes the method of any of examples 15-18, wherein the control information includes a buffer time threshold configured to indicate: once the time period during which a medium access control MAC service data unit MSDU transmitted via the QoS data frame is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 20 includes the method of example 19, wherein MSDUs that have been held in the reorder buffer for a period of time exceeding the buffering time threshold are expired MSDUs, and the buffering time threshold is further configured to indicate that MSDUs transmitted via the QoS data frame and having SNs that are lower than a sequence number SN of the expired MSDUs are to be flushed from the reorder buffer.
Example 21 includes the method of any of examples 15-18, further comprising: generating a management frame including management information associated with flushing of the reorder buffer at the receiver STA; and transmitting the management frame to the receiving STA.
Example 22 includes the method of example 21, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, to be transmitted to the recipient STA, and the maximum lifetime is configured to indicate that an MSDU is to be flushed from the reorder buffer once the lifetime of the MSDU exceeds the maximum lifetime.
Example 23 includes the method of example 21, wherein the management information includes a buffer time threshold configured to indicate: once the time period during which a medium access control MAC service data unit MSDU is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 24 includes the method of example 21, wherein the management frame is a stream classification service SCS request frame.
Example 25 includes the method of example 24, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, belonging to the requested SCS flow, and the maximum lifetime is configured to indicate that an MSDU is to be flushed from the reorder buffer once a lifetime of the MSDU transmitted via the requested SCS flow exceeds the maximum lifetime.
Example 26 includes the method of example 24, wherein the management information includes a buffer time threshold for the requested SCS stream, and the buffer time threshold is configured to indicate that a medium access control MAC service data unit MSDU transmitted via the requested SCS stream is to be flushed from the reorder buffer once a period of time during which the MSDU is held in the reorder buffer exceeds the buffer time threshold.
Example 27 includes the method of example 26, wherein the buffering time threshold is less than or equal to a delay limit of the requested SCS stream.
Example 28 includes the method of any one of examples 15-27, wherein the initiator STA is one of one or more initiator STAs included in the initiator MLD, and the receiver STA is one of one or more receiver STAs included in the receiver MLD.
Example 29 includes an apparatus for an initiator station STA, comprising interface circuitry; and processing circuitry coupled with the interface circuitry and configured to: generating a management frame including management information associated with flushing of a reorder buffer at a receiver STA; and providing the management frame to the interface circuit for transmission to the recipient STA.
Example 30 includes the apparatus of example 29, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, to be transmitted to the recipient STA, and the maximum lifetime is configured to indicate that an MSDU is to be flushed from the reorder buffer once the lifetime of the MSDU exceeds the maximum lifetime.
Example 31 includes the apparatus of example 29, wherein the management information includes a buffer time threshold configured to indicate: once the time period during which a medium access control MAC service data unit MSDU is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 32 includes the apparatus of example 29, wherein the management frame is a stream classification service SCS request frame.
Example 33 includes the apparatus of example 32, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, belonging to the requested SCS flow, and the maximum lifetime is configured to indicate that an MSDU is to be flushed from the reorder buffer once a lifetime of the MSDU transmitted via the requested SCS flow exceeds the maximum lifetime.
Example 34 includes the apparatus of example 32, wherein the management information includes a buffer time threshold for the requested SCS stream, and the buffer time threshold is configured to indicate that a medium access control MAC service data unit MSDU transmitted via the requested SCS stream is to be flushed from the reorder buffer once a period of time during which the MSDU is held in the reorder buffer exceeds the buffer time threshold.
Example 35 includes the apparatus of example 34, wherein the buffering time threshold is less than or equal to a delay limit of the requested SCS stream.
Example 36 includes the apparatus of any one of examples 29-35, wherein the initiator STA is one of one or more initiator STAs included in the initiator MLD, and the receiver STA is one of one or more receiver STAs included in the receiver MLD.
Example 37 includes a method for an initiator station STA, comprising: generating a management frame including management information associated with flushing of a reorder buffer at a receiver STA; and transmitting the management frame to the receiving STA.
Example 38 includes the method of example 37, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, to be transmitted to the recipient STA, and the maximum lifetime is configured to indicate that an MSDU is to be flushed from the reorder buffer once the lifetime of the MSDU exceeds the maximum lifetime.
Example 39 includes the method of example 37, wherein the management information includes a buffer time threshold configured to indicate: once the time period during which a medium access control MAC service data unit MSDU is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 40 includes the method of example 37, wherein the management frame is a stream classification service SCS request frame.
Example 41 includes the method of example 40, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, belonging to the requested SCS flow, and the maximum lifetime is configured to indicate that an MSDU is to be flushed from the reorder buffer once a lifetime of the MSDU transmitted via the requested SCS flow exceeds the maximum lifetime.
Example 42 includes the method of example 40, wherein the management information includes a buffer time threshold for the requested SCS stream, and the buffer time threshold is configured to indicate that a medium access control MAC service data unit MSDU transmitted via the requested SCS stream is to be flushed from the reorder buffer once a period of time during which the MSDU is held in the reorder buffer exceeds the buffer time threshold.
Example 43 includes the method of example 42, wherein the buffering time threshold is less than or equal to a delay limit of the requested SCS stream.
Example 44 includes the method of any one of examples 37-43, wherein the initiator STA is one of one or more initiator STAs included in the initiator MLD, and the receiver STA is one of one or more receiver STAs included in the receiver MLD.
Example 45 includes an apparatus for a receiver station STA, comprising: an interface circuit; and processing circuitry coupled with the interface circuitry and configured to: decoding a quality of service, qoS, data frame received from an initiator STA via the interface circuit, the QoS data frame including control information associated with flushing of a reorder buffer at the receiver STA; and flushing the reorder buffer based on the control information in the decoded QoS data frame.
Example 46 includes the apparatus of example 45, wherein the QoS data frame includes a medium access control, MAC, header and a plurality of MAC service data units, MSDUs, and the MAC header includes an aggregation control field that carries the control information.
Example 47 includes the apparatus of example 46, wherein the plurality of MSDUs have the same traffic identifier TID, the control information includes a highest flushable sequence number SN, and the processing circuit is configured to flush the reorder buffer by: flushing out MSDUs transmitted via the QoS data frame and having an SN lower than the highest scoutable SN from a reorder buffer for the TID.
Example 48 includes the apparatus of example 46, wherein the plurality of MSDUs have different traffic identifiers TIDs, the control information includes one or more sets of TIDs and one or more highest-scoutable sequence numbers SN, each highest-scoutable SN corresponding to a set of one or more TIDs, and the processing circuitry is configured to flush the reorder buffer by: for each highest scoutable SN, flushing from a reorder buffer for a set of one or more TIDs corresponding to the highest scoutable SN an MSDU transmitted via the QoS data frame and having an SN lower than the highest scoutable SN.
Example 49 includes the apparatus of any of examples 45-48, wherein the control information includes a buffer time threshold, and the processing circuit is configured to flush the reorder buffer by: once the time period during which a medium access control MAC service data unit MSDU transmitted via the QoS data frame is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 50 includes the apparatus of example 49, wherein the MSDU that has been in the reorder buffer for a period of time exceeding the buffer time threshold is an expired MSDU, and the processing circuit is configured to flush the reorder buffer by: MSDUs that are transmitted via the QoS data frames and have SN lower than the sequence number SN of the expired MSDUs are further flushed from the reorder buffer.
Example 51 includes the apparatus of any of examples 45-48, wherein the processing circuitry is further configured to: decoding a management frame received from the initiator STA via the interface circuitry, the management frame including management information associated with flushing of the reorder buffer at the receiver STA; and flushing the reorder buffer based on the management information in the decoded management frame.
Example 52 includes the apparatus of example 51, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, to be transmitted to the recipient STA, and the processing circuitry is configured to flush the reorder buffer by: once the lifetime of an MSDU exceeds the maximum lifetime, the MSDU is flushed from the reorder buffer.
Example 53 includes the apparatus of example 51, wherein the management information includes a buffer time threshold, and the processing circuit is configured to flush the reorder buffer by: once the time period during which a medium access control MAC service data unit MSDU is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 54 includes the apparatus of example 51, wherein the management frame is a stream classification service SCS request frame.
Example 55 includes the apparatus of example 54, wherein the management information includes a maximum lifetime of medium access control, MAC, service data units, MSDUs, belonging to the requested SCS flow, and the processing circuitry is configured to flush the reorder buffer by: once the lifetime of an MSDU streamed via the requested SCS exceeds the maximum lifetime, the MSDU is flushed from the reorder buffer.
Example 56 includes the apparatus of example 54, wherein the management information includes a buffer time threshold for the requested SCS stream, and the processing circuit is configured to flush the reorder buffer by: once the time period during which a medium access control MAC service data unit MSDU transmitted via the requested SCS stream is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 57 includes the apparatus of example 56, wherein the buffering time threshold is less than or equal to a delay limit of the requested SCS stream.
Example 58 includes the apparatus of any one of examples 45 to 57, wherein the initiator STA is one of one or more initiator STAs included in the initiator MLD, and the receiver STA is one of one or more receiver STAs included in the receiver MLD.
Example 59 includes a method for a recipient station, STA, comprising: decoding a quality of service, qoS, data frame received from an initiator STA, the QoS data frame including control information associated with flushing of a reorder buffer at the receiver STA; and flushing the reorder buffer based on the control information in the decoded QoS data frame.
Example 60 includes the method of example 59, wherein the QoS data frame includes a medium access control, MAC, header and a plurality of MAC service data units, MSDUs, and the MAC header includes an aggregation control field that carries the control information.
Example 61 includes the method of example 60, wherein the plurality of MSDUs have the same traffic identifier TID, the control information includes a highest flushable sequence number SN, and flushing the reorder buffer comprises: flushing out MSDUs transmitted via the QoS data frame and having an SN lower than the highest scoutable SN from a reorder buffer for the TID.
Example 62 includes the method of example 60, wherein the plurality of MSDUs have different traffic identifiers TIDs, the control information includes one or more sets of TIDs and one or more highest-scoutable sequence numbers SN, each highest-scoutable SN corresponding to a set of one or more TIDs, and flushing the reorder buffer comprises: for each highest scoutable SN, flushing from a reorder buffer for a set of one or more TIDs corresponding to the highest scoutable SN an MSDU transmitted via the QoS data frame and having an SN lower than the highest scoutable SN.
Example 63 includes the method of any of examples 59-62, wherein the control information includes a buffer time threshold, and flushing the reorder buffer includes: once the time period during which a medium access control MAC service data unit MSDU transmitted via the QoS data frame is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 64 includes the method of example 63, wherein the MSDU that has been in the reorder buffer for a period of time exceeding the buffer time threshold is an expired MSDU, and flushing the reorder buffer further comprises: and flushing MSDUs transmitted via the QoS data frames and having SNs lower than the sequence number SN of the expired MSDUs from the reorder buffer.
Example 65 includes the method of any of examples 59-62, further comprising: decoding a management frame received from the initiator STA, the management frame including management information associated with flushing of the reorder buffer at the receiver STA; and flushing the reorder buffer based on the management information in the decoded management frame.
Example 66 includes the method of example 65, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, to be transmitted to the recipient STA, and flushing the reorder buffer based on the management information includes: once the lifetime of an MSDU exceeds the maximum lifetime, the MSDU is flushed from the reorder buffer.
Example 67 includes the method of example 65, wherein the management information includes a buffer time threshold, and flushing the reorder buffer based on the management information includes: once the time period during which a medium access control MAC service data unit MSDU is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 68 includes the method of example 65, wherein the management frame is a stream classification service SCS request frame.
Example 69 includes the method of example 68, wherein the management information includes a maximum lifetime of medium access control, MAC, service data units, MSDUs, belonging to the requested SCS flow, and flushing the reorder buffer based on the management information includes: once the lifetime of an MSDU streamed via the requested SCS exceeds the maximum lifetime, the MSDU is flushed from the reorder buffer.
Example 70 includes the method of example 68, wherein the management information includes a buffer time threshold for the requested SCS stream, and flushing the reorder buffer based on the management information includes: once the time period during which a medium access control MAC service data unit MSDU transmitted via the requested SCS stream is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 71 includes the method of example 70, wherein the buffering time threshold is less than or equal to a delay limit of the requested SCS stream.
Example 72 includes the method of any of examples 59-71, wherein the initiator STA is one of one or more initiator STAs included in the initiator MLD, and the receiver STA is one of one or more receiver STAs included in the receiver MLD.
Example 73 includes an apparatus for a receiver station STA, comprising: an interface circuit; and processing circuitry coupled with the interface circuitry and configured to: decoding a management frame received from an initiator STA via the interface circuit, the management frame including management information associated with flushing of a reorder buffer at the receiver STA; and flushing the reorder buffer based on the management information in the decoded management frame.
Example 74 includes the apparatus of example 73, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, to be transmitted to the recipient STA, and the processing circuitry is configured to flush the reorder buffer by: once the lifetime of an MSDU exceeds the maximum lifetime, the MSDU is flushed from the reorder buffer.
Example 75 includes the apparatus of example 73, wherein the management information includes a buffer time threshold, and the processing circuit is configured to flush the reorder buffer by: once the time period during which a medium access control MAC service data unit MSDU is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 76 includes the apparatus of example 73, wherein the management frame is a stream classification service SCS request frame.
Example 77 includes the apparatus of example 76, wherein the management information includes a maximum lifetime of medium access control, MAC, service data units, MSDUs, belonging to the requested SCS flow, and the processing circuitry is configured to flush the reorder buffer by: once the lifetime of an MSDU streamed via the requested SCS exceeds the maximum lifetime, the MSDU is flushed from the reorder buffer.
Example 78 includes the apparatus of example 76, wherein the management information includes a buffer time threshold for the requested SCS stream, and the processing circuit is configured to flush the reorder buffer by: once the time period during which a medium access control MAC service data unit MSDU transmitted via the requested SCS stream is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 79 includes the apparatus of example 78, wherein the buffering time threshold is less than or equal to a delay limit of the requested SCS stream.
Example 80 includes the apparatus of any one of examples 73-79, wherein the initiator STA is one of one or more initiator STAs included in the initiator MLD, and the receiver STA is one of one or more receiver STAs included in the receiver MLD.
Example 81 includes a method for a recipient station, STA, comprising: decoding a management frame received from an initiator STA, the management frame including management information associated with flushing of a reorder buffer at the receiver STA; and flushing the reorder buffer based on the management information in the decoded management frame.
Example 82 includes the method of example 81, wherein the management information includes a maximum lifetime of a medium access control, MAC, service data unit, MSDU, to be transmitted to the recipient STA, and flushing the reorder buffer based on the management information includes: once the lifetime of an MSDU exceeds the maximum lifetime, the MSDU is flushed from the reorder buffer.
Example 83 includes the method of example 81, wherein the management information includes a buffer time threshold, and flushing the reorder buffer based on the management information includes: once the time period during which a medium access control MAC service data unit MSDU is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 84 includes the method of example 81, wherein the management frame is a stream classification service SCS request frame.
Example 85 includes the method of example 84, wherein the management information includes a maximum lifetime of medium access control, MAC, service data units, MSDUs, belonging to the requested SCS flow, and flushing the reorder buffer based on the management information includes: once the lifetime of an MSDU streamed via the requested SCS exceeds the maximum lifetime, the MSDU is flushed from the reorder buffer.
Example 86 includes the method of example 84, wherein the management information includes a buffer time threshold for the requested SCS stream, and flushing the reorder buffer based on the management information includes: once the time period during which a medium access control MAC service data unit MSDU transmitted via the requested SCS stream is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
Example 87 includes the method of example 86, wherein the buffering time threshold is less than or equal to a delay limit of the requested SCS stream.
Example 88 includes the method of any of examples 81-87, wherein the initiator STA is one of one or more initiator STAs included in the initiator MLD, and the receiver STA is one of one or more receiver STAs included in the receiver MLD.
Example 89 includes a computer-readable medium having instructions stored thereon, wherein the instructions, when executed by processing circuitry of an initiator station STA, cause the processing circuitry to perform the method of any of examples 15-28 and 37-44.
Example 90 includes a computer-readable medium having instructions stored thereon, wherein the instructions, when executed by processing circuitry of a recipient station STA, cause the processing circuitry to perform the method of any of examples 59-72 and 81-88.
Example 91 includes an apparatus for an initiator station STA, comprising means for performing the operations of the method of any of examples 15-28 and 37-44.
Example 92 includes an apparatus for a receiver station STA, comprising means for performing the operations of the method of any of examples 59-72 and 81-88.
Embodiments according to the present disclosure are specifically disclosed in the appended claims directed to methods, storage media, devices and computer program products, wherein any features mentioned in one claim category (e.g. methods) may also be claimed in another claim category (e.g. systems). The dependencies or references in the appended claims are chosen for formal reasons only. However, any subject matter resulting from the intentional backtracking of any preceding claim (particularly multiple dependencies) may also be claimed, such that any combination of claims and their features are disclosed and claimed, regardless of the dependencies selected in the appended claims. The subject matter which may be claimed includes not only the combination of features set forth in the attached claims, but also any other combination of features in the claims, wherein each feature mentioned in the claims may be combined with any other feature or combination of features in the claims. Furthermore, any embodiments and features described or depicted herein may be claimed in separate claims and/or in any combination with any embodiments or features described or depicted herein or with any features of the accompanying claims.
The foregoing description of one or more implementations provides illustration and description, but is not intended to be exhaustive or to limit the scope of the embodiments to the precise form disclosed. Modifications and variations are possible in light of the above teachings or may be acquired from practice of various embodiments.
Certain aspects of the present disclosure are described above with reference to block diagrams and flowchart illustrations of systems, methods, apparatus and/or computer program products according to various embodiments. It will be understood that one or more blocks of the block diagrams and flowchart illustrations, and combinations of blocks in the block diagrams and flowchart illustrations, respectively, can be implemented by computer-executable program instructions. Also, some blocks of the block diagrams and flowchart illustrations may not necessarily need to be performed in the order presented, or may not need to be performed at all, according to some embodiments.
These computer-executable program instructions may be loaded onto a special purpose computer or other special purpose machine, processor, or other programmable data processing apparatus to produce a particular machine, such that the instructions which execute on the computer, processor, or other programmable data processing apparatus create means for implementing one or more functions specified in the flowchart block or blocks. These computer program instructions may also be stored in a computer-readable storage medium or memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means which implement one or more functions specified in the flowchart block or blocks. By way of example, certain embodiments may provide a computer program product comprising a computer readable storage medium having computer readable program code or program instructions embodied therein, the computer readable program code adapted to be executed to implement one or more functions specified in one or more of the flowcharts. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational elements or steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide elements or steps for implementing the functions specified in the flowchart block or blocks.
Accordingly, blocks of the block diagrams and flowchart illustrations support combinations of means for performing the specified functions, combinations of elements or steps for performing the specified functions and program instruction means for performing the specified functions. It will also be understood that each block of the block diagrams and flowchart illustrations, and combinations of blocks in the block diagrams and flowchart illustrations, can be implemented by special purpose, hardware-based computer systems that perform the specified functions, elements or steps, or combinations of special purpose hardware and computer instructions.
Conditional language, such as "may" or "may" and the like, unless expressly stated otherwise or otherwise understood in the context of use, is generally intended to convey that certain embodiments may include, while other embodiments do not include, certain features, elements and/or operations. Thus, such conditional language is not generally intended to imply that features, elements and/or operations are in any way required for one or more embodiments or that one or more embodiments must include logic for deciding, with or without user input or prompting, whether these features, elements and/or operations are included in or are to be performed in any particular embodiment.
Many modifications and other embodiments of the disclosure set forth herein will come to mind to one benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the disclosure is not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (25)
1. An apparatus for an initiator station STA, comprising:
an interface circuit; and
processing circuitry coupled with the interface circuitry and configured to:
generating a quality of service, qoS, data frame comprising control information associated with flushing of a reorder buffer at a receiver STA; and is also provided with
The QoS data frame is provided to the interface circuit for transmission to the recipient STA.
2. The apparatus of claim 1, wherein
The QoS data frame includes a Medium Access Control (MAC) header and a plurality of MAC Service Data Units (MSDUs), and
the MAC header includes an aggregation control field that carries the control information.
3. The apparatus of claim 2, wherein
The plurality of MSDUs have the same traffic identifier TID, and
the control information includes a highest scoutable sequence number SN configured to indicate that MSDUs transmitted via the QoS data frame and having an SN lower than the highest scoutable SN are to be flushed from a reorder buffer for the TID.
4. The apparatus of claim 2, wherein
The plurality of MSDUs have different traffic identifiers TIDs, an
The control information includes one or more sets of TIDs and one or more highest-scoutable sequence numbers SN, each highest-scoutable SN corresponding to a set of one or more TIDs and configured to indicate that MSDUs transmitted via the QoS data frames and having SNs lower than the highest-scoutable SN are to be scoured from a reorder buffer for the set of one or more TIDs.
5. The device of any one of claims 1 to 4, wherein
The control information includes a buffer time threshold configured to indicate: once the time period during which a medium access control MAC service data unit MSDU transmitted via the QoS data frame is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
6. The apparatus of claim 5, wherein
The MSDU that has been in the reorder buffer for a period of time exceeding the buffer time threshold is an expired MSDU, and
the buffer time threshold is further configured to indicate that MSDUs are to be flushed from the reorder buffer, which MSDUs are transmitted via the QoS data frames and have a SN that is lower than a SN of the expired MSDUs.
7. The apparatus of any one of claims 1 to 4, wherein the processing circuit is further configured to:
generating a management frame including management information associated with flushing of the reorder buffer at the receiver STA; and is also provided with
The management frame is provided to the interface circuit for transmission to the recipient STA.
8. The apparatus of claim 7, wherein the management information comprises a maximum lifetime of a medium access control, MAC, service data unit, MSDU, to be transmitted to the recipient STA, and the maximum lifetime is configured to indicate that an MSDU is to be flushed from the reorder buffer once its lifetime exceeds the maximum lifetime.
9. The apparatus of claim 7, wherein the management information comprises a buffer time threshold configured to indicate: once the time period during which a medium access control MAC service data unit MSDU is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
10. The apparatus of claim 7, wherein the management frame is a stream classification service SCS request frame.
11. The apparatus of claim 10, wherein the management information comprises a maximum lifetime of media access control, MAC, service data units, MSDUs, belonging to the requested SCS flow, and the maximum lifetime is configured to indicate that MSDUs are to be flushed from the reorder buffer once the lifetime of MSDUs transmitted via the requested SCS flow exceeds the maximum lifetime.
12. The apparatus of claim 10, wherein the management information comprises a buffer time threshold for the requested SCS stream, and the buffer time threshold is configured to indicate that a medium access control, MAC, service data unit, MSDU, is to be flushed from the reorder buffer once a period of time that the MSDU is held in the reorder buffer for transmission via the requested SCS stream exceeds the buffer time threshold.
13. The apparatus of claim 12, wherein the buffering time threshold is less than or equal to a delay limit of the requested SCS stream.
14. An apparatus for a receiver station STA, comprising:
an interface circuit; and
processing circuitry coupled with the interface circuitry and configured to:
Decoding a quality of service, qoS, data frame received from an initiator STA via the interface circuit, the QoS data frame including control information associated with flushing of a reorder buffer at the receiver STA; and is also provided with
The reorder buffer is flushed based on the control information in the decoded QoS data frame.
15. The apparatus of claim 14, wherein
The QoS data frame includes a Medium Access Control (MAC) header and a plurality of MAC Service Data Units (MSDUs), and
the MAC header includes an aggregation control field that carries the control information.
16. The apparatus of claim 15, wherein
The multiple MSDUs have the same traffic identifier TID,
the control information includes a highest flushable sequence number, SN, and
the processing circuit is configured to flush the reorder buffer by: flushing out MSDUs transmitted via the QoS data frame and having an SN lower than the highest scoutable SN from a reorder buffer for the TID.
17. The apparatus of claim 15, wherein
The plurality of MSDUs have different traffic identifiers TIDs,
the control information includes one or more sets of TIDs and one or more highest-scour sequence numbers SN, each highest-scour SN corresponding to a set of one or more TIDs, and
The processing circuit is configured to flush the reorder buffer by:
for each highest scoutable SN, flushing from a reorder buffer for a set of one or more TIDs corresponding to the highest scoutable SN an MSDU transmitted via the QoS data frame and having an SN lower than the highest scoutable SN.
18. The apparatus of any one of claims 14 to 17, wherein
The control information includes a buffer time threshold, and
the processing circuit is configured to flush the reorder buffer by: once the time period during which a medium access control MAC service data unit MSDU transmitted via the QoS data frame is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
19. The apparatus of claim 18, wherein
The MSDU that has been in the reorder buffer for a period of time exceeding the buffer time threshold is an expired MSDU, and
the processing circuit is configured to flush the reorder buffer by: MSDUs that are transmitted via the QoS data frames and have SN lower than the sequence number SN of the expired MSDUs are further flushed from the reorder buffer.
20. The apparatus of any of claims 14 to 17, wherein the processing circuit is further configured to:
decoding a management frame received from the initiator STA via the interface circuitry, the management frame including management information associated with flushing of the reorder buffer at the receiver STA; and is also provided with
The reorder buffer is flushed based on the management information in the decoded management frame.
21. The apparatus of claim 20, wherein
The management information includes a maximum lifetime of a medium access control MAC service data unit MSDU to be transmitted to the receiving STA, and
the processing circuit is configured to flush the reorder buffer by: once the lifetime of an MSDU exceeds the maximum lifetime, the MSDU is flushed from the reorder buffer.
22. The apparatus of claim 20, wherein
The management information includes a buffer time threshold, and
the processing circuit is configured to flush the reorder buffer by: once the time period during which a medium access control MAC service data unit MSDU is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
23. The apparatus of claim 22, wherein the management frame is a stream classification service SCS request frame.
24. The apparatus of claim 23, wherein
The management information includes a maximum lifetime of a Medium Access Control (MAC) service data unit (MSDU) belonging to the requested SCS stream, and
the processing circuit is configured to flush the reorder buffer by: once the lifetime of an MSDU streamed via the requested SCS exceeds the maximum lifetime, the MSDU is flushed from the reorder buffer.
25. The apparatus of claim 23, wherein
The management information includes a buffer time threshold for the requested SCS stream, and
the processing circuit is configured to flush the reorder buffer by: once the time period during which a medium access control MAC service data unit MSDU transmitted via the requested SCS stream is held in the reorder buffer exceeds the buffering time threshold, the MSDU is flushed from the reorder buffer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US202163272000P | 2021-10-26 | 2021-10-26 | |
| US63/272,000 | 2021-10-26 |
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| CN116033489A true CN116033489A (en) | 2023-04-28 |
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