U.S. patent application number 13/738162 was filed with the patent office on 2013-05-23 for device, system and method of simultaneously communicating with a group of wireless communication devices.
The applicant listed for this patent is Michelle X. Gong, Robert J. Stacey. Invention is credited to Michelle X. Gong, Robert J. Stacey.
Application Number | 20130128837 13/738162 |
Document ID | / |
Family ID | 44150980 |
Filed Date | 2013-05-23 |
United States Patent
Application |
20130128837 |
Kind Code |
A1 |
Gong; Michelle X. ; et
al. |
May 23, 2013 |
DEVICE, SYSTEM AND METHOD OF SIMULTANEOUSLY COMMUNICATING WITH A
GROUP OF WIRELESS COMMUNICATION DEVICES
Abstract
Some demonstrative embodiments include devices, systems and/or
methods of simultaneously communicating with a group of wireless
communication devices. For example, a device may include a wireless
communication unit to transmit at least one beamforming-training
initiation frame to a group of a plurality of wireless
communication devices, wherein the wireless communication unit is
to receive two or more feedback frames from two or more of the
wireless communication devices, wherein the wireless communication
unit is to determine two or more beamforming schemes based on the
two or more feedback frames, and wherein the wireless communication
unit is to simultaneously transmit two or more different wireless
communication transmissions to the two or more wireless
communication devices, respectively, using the two or more
beamforming schemes, respectively. Other embodiments are described
and claimed.
Inventors: |
Gong; Michelle X.;
(Sunnyvale, CA) ; Stacey; Robert J.; (Portland,
OR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Gong; Michelle X.
Stacey; Robert J. |
Sunnyvale
Portland |
CA
OR |
US
US |
|
|
Family ID: |
44150980 |
Appl. No.: |
13/738162 |
Filed: |
January 10, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
12645648 |
Dec 23, 2009 |
8374154 |
|
|
13738162 |
|
|
|
|
Current U.S.
Class: |
370/329 |
Current CPC
Class: |
H04B 7/0634 20130101;
H04W 74/0833 20130101; H04L 25/03343 20130101; H04L 2025/03802
20130101; H04W 4/08 20130101; H04L 5/0023 20130101; H04L 2025/03783
20130101; H04W 16/28 20130101 |
Class at
Publication: |
370/329 |
International
Class: |
H04W 4/08 20060101
H04W004/08 |
Claims
1. A device including: a wireless communication unit to transmit at
least one beamforming-training initiation frame to a group of a
plurality of wireless communication devices, wherein the wireless
communication unit is to receive two or more feedback frames from
two or more of the wireless communication devices, wherein the
wireless communication unit is to determine two or more beamforming
schemes based on the two or more feedback frames, and wherein the
wireless communication unit is to simultaneously transmit two or
more different wireless communication transmissions to the two or
more wireless communication devices, respectively, using the two or
more beamforming schemes, respectively.
2. The device of claim 1, wherein the wireless communication unit
is to determine an order at which the feedback frames are to be
transmitted, and wherein the initiation frame includes an
indication of the required order.
3. The device of claim 1, wherein the initiation frame includes a
training request frame, and wherein the feedback frames include
channel sounding frames.
4. The device of claim 1, wherein the initiation frame includes a
channel sounding frame, and wherein the feedback frames include
beamforming feedback frames.
5. The device of claim 1, wherein the wireless communication unit
is to transmit the initiation frame including an address assigned
to the group of wireless communication devices.
6. The device of claim 1, wherein the wireless communication unit
is to communicate with the group of wireless communication devices
over a wireless communication medium, wherein the wireless
communication unit is to reserve the wireless communication medium
for a time period, during which the wireless communication unit is
to transmit the beamforming-training initiation frame, receive the
feedback frames, and simultaneously transmit the two or more
different wireless communication transmissions.
7. The device of claim 6, wherein the wireless communication unit
is to reserve the wireless communication medium by transmitting at
least one request-to-send packet to one or more wireless
communication devices of the group, wherein the request-to-send
packet includes a duration value corresponding to the time period
to be reserved.
8. The device of claim 6, wherein the wireless communication unit
is to reserve the wireless communication medium by transmitting a
data packet to at least one of the wireless communication devices
of the group, wherein the packet includes a duration value
corresponding to the time period to be reserved.
9. The device of claim 6, wherein the wireless medium operates
according to a
carrier-sense-multiple-access-with-collision-avoidance scheme.
10. The device of claim 1, wherein the wireless communication unit
is to transmit the two or more transmissions according to a
space-division-multiple-access (SDMA) scheme.
11. A method including: transmitting at least one
beamforming-training initiation frame from a wireless communication
unit to a group of a plurality of wireless communication devices;
receiving, at the wireless communication unit, two or more feedback
frames from two or more of the wireless communication devices;
determining two or more beamforming schemes based on the two or
more feedback frames; and simultaneously transmitting two or more
different wireless communication transmissions from the wireless
communication unit to the two or more wireless communication
devices, respectively, using the two or more beamforming schemes,
respectively.
12. The method of claim 11 including determining an order at which
the feedback frames are to be transmitted, wherein the initiation
frame includes an indication of the required order.
13. The method of claim 11, wherein the initiation frame includes a
training request frame, and wherein the feedback frames include
channel sounding frames.
14. The method of claim 11, wherein the initiation frame includes a
channel sounding frame, and wherein the feedback frames include
beamforming feedback frames.
15. The method of claim 11 including transmitting the initiation
frame including an address assigned to the group of wireless
communication devices.
16. The method of claim 11 including: reserving, by the wireless
communication unit, a wireless communication medium for a time
period, which includes a time period for to transmitting the
beamforming-training initiation frame, receiving the feedback
frames, and simultaneously transmitting the two or more different
wireless communication transmissions.
17. A wireless communication system including: a wireless
communication device to communicate with a group of a plurality of
other wireless communication devices, wherein the wireless
communication device includes: one or more antennas; and a wireless
communication unit to transmit at least one beamforming-training
initiation frame to the group of wireless communication devices,
wherein the wireless communication unit is to receive two or more
feedback frames from two or more of the wireless communication
devices, wherein the wireless communication unit is to determine
two or more beamforming schemes based on the two or more feedback
frames, and wherein the wireless communication unit is to
simultaneously transmit two or more different wireless
communication transmissions to the two or more wireless
communication devices, respectively, using the two or more
beamforming schemes, respectively.
18. The system of claim 17, wherein the wireless communication unit
is to determine an order at which the feedback frames are to be
transmitted, and wherein the initiation frame includes an
indication of the required order.
19. The device of claim 17, wherein the wireless communication unit
is to transmit the initiation frame including an address assigned
to the group of wireless communication devices.
20. The device of claim 17, wherein the wireless communication unit
is to communicate with the group of wireless communication devices
over a wireless communication medium, wherein the wireless
communication unit is to reserve the wireless communication medium
for a time period, during which the wireless communication unit is
to transmit the beamforming-training initiation frame, receive the
feedback frames, and simultaneously transmit the two or more
different wireless communication transmissions.
Description
CROSS REFERENCE
[0001] This Application is a Continuation Application of U.S.
patent application Ser. No. 12/645,648 entitled "Device, System and
Method of Simultaneously Communicating With a Group of Wireless
Communication Devices", filed Dec. 23, 2009, the entire disclosure
of which is incorporated herein by reference.
BACKGROUND
[0002] A Spatial Division Multiple Access (SDMA) communication
scheme may be implemented for communicating between a wireless
communication device and a plurality of other wireless
communication devices. The wireless communication device may
transmit a downlink SDMA transmission by transmitting different
signals substantially simultaneously via a combination of antennas.
The combined transmitted signals may result in different signals,
which are to be received by the plurality of other wireless
communication devices, being transmitted substantially in different
directions on the same frequency.
[0003] The wireless communication device may receive an uplink SDMA
transmission including different signals from the plurality of
other wireless communication devices.
BRIEF DESCRIPTION OF THE DRAWINGS
[0004] For simplicity and clarity of illustration, elements shown
in the figures have not necessarily been drawn to scale. For
example, the dimensions of some of the elements may be exaggerated
relative to other elements for clarity of presentation.
Furthermore, reference numerals may be repeated among the figures
to indicate corresponding or analogous elements. The figures are
listed below.
[0005] FIG. 1 is a schematic block diagram illustration of a system
in accordance with some demonstrative embodiments.
[0006] FIG. 2 is a schematic illustration of a sequence of
transmissions between a wireless communication device and a group
of other wireless communication devices, in accordance with some
demonstrative embodiments.
[0007] FIG. 3 is a schematic illustration of another sequence of
transmissions between a wireless communication device and a group
of other wireless communication devices, in accordance with some
demonstrative embodiments.
[0008] FIG. 4 is a schematic flow-chart illustration of a method of
simultaneously communicating with a group of wireless communication
devices, in accordance with some demonstrative embodiments.
[0009] FIG. 5 is a schematic illustration of an article of
manufacture, in accordance with some demonstrative embodiments.
DETAILED DESCRIPTION
[0010] In the following detailed description, numerous specific
details are set forth in order to provide a thorough understanding
of some embodiments. However, it will be understood by persons of
ordinary skill in the art that some embodiments may be practiced
without these specific details. In other instances, well-known
methods, procedures, components, units and/or circuits have not
been described in detail so as not to obscure the discussion.
[0011] Discussions herein utilizing terms such as, for example,
"processing", "computing", "calculating", "determining",
"establishing", "analyzing", "checking", or the like, may refer to
operation(s) and/or process(es) of a computer, a computing
platform, a computing system, or other electronic computing device,
that manipulate and/or transform data represented as physical
(e.g., electronic) quantities within the computer's registers
and/or memories into other data similarly represented as physical
quantities within the computer's registers and/or memories or other
information storage medium that may store instructions to perform
operations and/or processes.
[0012] The terms "plurality" and "a plurality" as used herein
include, for example, "multiple" or "two or more". For example, "a
plurality of items" includes two or more items.
[0013] Some embodiments may be used in conjunction with various
devices and systems, for example, a Personal Computer (PC), a
desktop computer, a mobile computer, a laptop computer, a notebook
computer, a tablet computer, a server computer, a handheld
computer, a handheld device, a Personal Digital Assistant (PDA)
device, a handheld PDA device, an on-board device, an off-board
device, a hybrid device, a vehicular device, a non-vehicular
device, a mobile or portable device, a consumer device, a
non-mobile or non-portable device, a wireless communication
station, a wireless communication device, a wireless Access Point
(AP), a wired or wireless router, a wired or wireless modem, a
video device, an audio device, an audio-video (A/V) device, a
Set-Top-Box (STB), a Blu-ray disc (BD) player, a BD recorder, a
Digital Video Disc (DVD) player, a High Definition (HD) DVD player,
a DVD recorder, a HD DVD recorder, a Personal Video Recorder (PVR),
a broadcast HD receiver, a video source, an audio source, a video
sink, an audio sink, 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 gaming device, a data source, a data sink, a
Digital Still camera (DSC), a wired or wireless network, a wireless
area network, a Wireless Video Area Network (WVAN), a Local Area
Network (LAN), a Wireless LAN (WLAN), a Personal Area Network
(PAN), a Wireless PAN (WPAN), devices and/or networks operating in
accordance with existing IEEE 802.11 (IEEE 802.11-1999: Wireless
LAN Medium Access Control (MAC) and Physical Layer (PHY)
Specifications), 802.11a, 802.11b, 802.11g, 802.11h, 802.11j,
802.11n, 802.11 task group ad (TGad), 802.16, 802.16d, 802.16e,
802.16f, standards and/or future versions and/or derivatives
thereof, devices and/or networks operating in accordance with
existing Wireless-Gigabit-Alliance (WGA) and/or WirelessHD.TM.
specifications and/or future versions and/or derivatives thereof,
units and/or devices which are part of the above networks, one way
and/or two-way radio communication systems, cellular
radio-telephone communication systems, a cellular telephone, a
wireless telephone, a Personal Communication Systems (PCS) device,
a PDA device which incorporates a wireless communication device, a
mobile or portable Global Positioning System (GPS) device, a device
which incorporates a GPS receiver or transceiver or chip, a device
which incorporates 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 antennas and/or external antennas, Digital Video
Broadcast (DVB) devices or systems, multi-standard radio devices or
systems, a wired or wireless handheld device (e.g., BlackBerry,
Palm Treo), a Wireless Application Protocol (WAP) device, or the
like.
[0014] Some embodiments may be used in conjunction with one or more
types of wireless communication signals and/or systems, for
example, Radio Frequency (RF), Infra Red (IR), Frequency-Division
Multiplexing (FDM), Orthogonal FDM (OFDM), Time-Division
Multiplexing (TDM), Time-Division Multiple Access (TDMA), Extended
TDMA (E-TDMA), General Packet Radio Service (GPRS), extended GPRS,
Code-Division Multiple Access (CDMA), Wideband CDMA (WCDMA), CDMA
2000, single-carrier CDMA, multi-carrier CDMA, Multi-Carrier
Modulation (MDM), Discrete Multi-Tone (DMT), Bluetooth.RTM., Global
Positioning System (GPS), Wi-Fi, Wi-Max, ZigBee.TM., Ultra-Wideband
(UWB), Global System for Mobile communication (GSM), 2G, 2.5G, 3G,
3.5G, Enhanced Data rates for GSM Evolution (EDGE), or the like.
Other embodiments may be used in various other devices, systems
and/or networks.
[0015] The term "wireless device" as used herein includes, for
example, a device capable of wireless communication, a
communication device capable of wireless communication, a
communication station capable of wireless communication, a portable
or non-portable device capable of wireless communication, or the
like. In some demonstrative embodiments, a wireless device may be
or may include a peripheral that is integrated with a computer, or
a peripheral that is attached to a computer. In some demonstrative
embodiments, the term "wireless device" may optionally include a
wireless service.
[0016] The term "substantially simultaneously", as used herein with
reference to transmitting to two or more different wireless
communication devices and/or receiving from two or more wireless
communication devices, may refer to transmitting and/or receiving
two or more transmissions, wherein at least a portion of each
transmission and/or reception occurs at the same time, but does not
imply that the different transmissions and/or receptions must start
and/or end at the same time, although they may.
[0017] Some demonstrative embodiments may be used in conjunction
with suitable limited-range or short-range wireless communication
networks, for example, a wireless area network, a "piconet", a
WPAN, a WVAN and the like. Other embodiments may be used in
conjunction with any other suitable wireless communication
network.
[0018] Some demonstrative embodiments may be used in conjunction
with a wireless communication network communicating over a
frequency band of 60 GHz. However, other embodiments may be
implemented utilizing any other suitable wireless communication
frequency bands, for example, an Extremely High Frequency (EHF)
band (the millimeter wave (mmwave) frequency band), e.g., a
frequency band within the frequency band of between 30Ghz and 300
GHZ, a WLAN frequency band, a WPAN frequency band, a frequency band
according to the IEEE 802.11, IEEE 802.11TGad and/or WGA
specifications, and the like.
[0019] Reference is now made to FIG. 1, which schematically
illustrates a block diagram of a system 100 in accordance with some
demonstrative embodiments.
[0020] As shown in FIG. 1, in some demonstrative embodiments,
system 100 may include a wireless communication network including
one or more wireless communication devices, e.g., wireless
communication devices 102, 104, 106, 107 and/or 108, capable of
communicating content, data, information and/or signals over a
wireless communication medium 110, for example, over one or more
suitable wireless communication links, e.g., a radio channel, an IR
channel, a RF channel, a Wireless Fidelity (WiFi) channel, and the
like. One or more elements of system 100 may optionally be capable
of communicating over any suitable wired communication links.
[0021] In some demonstrative embodiments, wireless communication
devices 102, 104, 106, 107 and/or 108 may include, for example, a
PC, a desktop computer, a mobile computer, a laptop computer, a
notebook computer, a tablet computer, a server computer, a handheld
computer, a handheld device, a PDA device, a handheld PDA device,
an on-board device, an off-board device, a hybrid device (e.g.,
combining cellular phone functionalities with PDA device
functionalities), a consumer device, a vehicular device, a
non-vehicular device, a mobile or portable device, a non-mobile or
non-portable device, a cellular telephone, a PCS device, a PDA
device which incorporates a wireless communication device, a mobile
or portable GPS device, a DVB device, a relatively small computing
device, a non-desktop computer, a "Carry Small Live Large" (CSLL)
device, an Ultra Mobile Device (UMD), an Ultra Mobile PC (UMPC), a
Mobile Internet Device (MID), an "Origami" device or computing
device, a device that supports Dynamically Composable Computing
(DCC), a context-aware device, a video device, an audio device, an
A/V device, a STB, a BD player, a BD recorder, a DVD player, a HD
DVD player, a DVD recorder, a HD DVD recorder, a PVR, a broadcast
HD receiver, a video source, an audio source, a video sink, an
audio sink, a stereo tuner, a broadcast radio receiver, a flat
panel display, a PMP, a DVC, a digital audio player, a speaker, an
audio receiver, a gaming device, an audio amplifier, a data source,
a data sink, a DSC, a media player, a Smartphone, a television, a
music player, or the like.
[0022] In some demonstrative embodiments, wireless communication
device 102 may include a wireless communication unit 112 to perform
wireless communication with wireless communication devices 104,
106, 107 and/or 108 with one or more other wireless communication
devices, e.g., as described below. Wireless communication device
102 may also include, for example, one or more of a processor 114,
an input unit 116, an output unit 118, a memory unit 120, and a
storage unit 122. Wireless communication device 102 may optionally
include other suitable hardware components and/or software
components. In some demonstrative embodiments, some or all of the
components of wireless communication device 102 may be enclosed in
a common housing or packaging, and may be interconnected or
operably associated using one or more wired or wireless links. In
other embodiments, components of wireless communication device 102
may be distributed among multiple or separate devices.
[0023] Processor 114 includes, for example, a Central Processing
Unit (CPU), a Digital Signal Processor (DSP), one or more processor
cores, a single-core processor, a dual-core processor, a
multiple-core processor, a microprocessor, a host processor, a
controller, a plurality of processors or controllers, a chip, a
microchip, one or more circuits, circuitry, a logic unit, an
Integrated Circuit (IC), an Application-Specific IC (ASIC), or any
other suitable multi-purpose or specific processor or controller.
Processor 114 executes instructions, for example, of an Operating
System (OS) of wireless communication device 102 and/or of one or
more suitable applications.
[0024] Input unit 116 includes, for example, a keyboard, a keypad,
a mouse, a touch-pad, a track-ball, a stylus, a microphone, or
other suitable pointing device or input device. Output unit 118
includes, for example, a monitor, a screen, a flat panel display, a
Cathode Ray Tube (CRT) display unit, a Liquid Crystal Display (LCD)
display unit, a plasma display unit, one or more audio speakers or
earphones, or other suitable output devices.
[0025] Memory unit 120 includes, for example, a Random Access
Memory (RAM), a Read Only Memory (ROM), a Dynamic RAM (DRAM), a
Synchronous DRAM (SD-RAM), a flash memory, a volatile memory, a
non-volatile memory, a cache memory, a buffer, a short term memory
unit, a long term memory unit, or other suitable memory units.
Storage unit 122 includes, for example, a hard disk drive, a floppy
disk drive, a Compact Disk (CD) drive, a CD-ROM drive, a DVD drive,
or other suitable removable or non-removable storage units. Memory
unit 120 and/or storage unit 122, for example, may store data
processed by wireless communication device 102.
[0026] In some demonstrative embodiments, wireless communication
unit 112 includes, for example, one or more wireless transmitters,
receivers and/or transceivers able to send and/or receive wireless
communication signals, RF signals, frames, blocks, transmission
streams, packets, messages, data items, and/or data. For example,
wireless communication unit 112 may include or may be implemented
as part of a wireless Network Interface Card (NIC), and the
like.
[0027] Wireless communication unit 112 may include, or may be
associated with, one or more antennas 124. Antennas 124 may
include, for example, an internal and/or external RF antenna, a
dipole antenna, a monopole antenna, an omni-directional antenna, an
end fed antenna, a circularly polarized antenna, a micro-strip
antenna, a diversity antenna, or other type of antenna suitable for
transmitting and/or receiving wireless communication signals,
blocks, frames, transmission streams, packets, messages and/or
data.
[0028] In some demonstrative embodiments, the wireless
communication devices of system 100 may communicate over wireless
communication medium 110 according to any suitable access scheme,
for example, a suitable contention-based access scheme, e.g., a
random-access scheme. For example, system 100 may include a
wireless network, e.g., a wireless Local-Area-Network (LAN)
communicating over unlicensed frequency bands, which may operate
according to a random access scheme, e.g., in order to allow
coexistence with one or more other networks without requiring
central coordination. The contention-based scheme may include, for
example, any suitable Carrier-Sense-Multiple-Access (CSMA) scheme,
for example, any suitable CSMA-with-Collision-Avoidance (CSMA/CA)
scheme, e.g., according to the IEEE 802.11 standards and/or any
other suitable standard.
[0029] In some demonstrative embodiments, at least one wireless
communication device of system 100, e.g., wireless communication
device 102, may perform the functionality of an Access Point (AP),
Control Point (CP), Base Station (BS) or any suitable coordinator
or controller, e.g., as defined by the IEEE 802.11 and/or WGA
specifications.
[0030] In some demonstrative embodiments, wireless communication
unit 112 may be capable of simultaneously transmitting
transmissions to two or more other devices of system 100 and/or
simultaneously receiving transmissions from two or more other
devices of system 100.
[0031] In some embodiments, wireless communication unit 112 may be
capable of performing Spatial Division Multiple Access (SDMA)
communication. For example, wireless communication unit 112 may
transmit a downlink SDMA transmission by transmitting different
signals substantially simultaneously via antennas 124, such that
the combined transmitted signals result in different signals, which
are intended to be received by two or more other wireless
communication devices of system 100, being transmitted
substantially in different directions on the same frequency.
[0032] In some demonstrative embodiments, wireless communication
unit 112 may receive an uplink SDMA transmission including
different signals from two or more other devices of system 100.
[0033] In some demonstrative embodiments, wireless communication
unit 112 may communicate over medium 110 with at least one group
130 of a plurality of wireless communication devices of system 100,
e.g., as described in detail below.
[0034] In some demonstrative embodiments, group 130 may include a
plurality of wireless communication devices, e.g., wireless
communication devices 104, 106 and/or 107, which may be suitable
for simultaneous downlink and/or uplink wireless communication with
wireless communication unit 112. For example, group 130 may include
a SDMA group of devices suitable for unidirectional, e.g., in an
uplink direction to device 102 and/or a downlink direction from
device 102, and/or bidirectional communication with wireless
communication unit 112, e.g., as described below.
[0035] In some demonstrative embodiments, the wireless
communication devices of group 130 may be grouped together, e.g.,
by wireless communication unit 112, according to any suitable
criteria, for example, one or more traffic-specification (TSPEC)
requirements, e.g., quality of service requirements, bandwidth
requirements, traffic pattern requirements, and the like, and/or
any other suitable requirement and/or parameter.
[0036] In some demonstrative embodiments, wireless communication
unit 112 may be capable of receiving the TSPEC information
corresponding to wireless communication devices 104, 106 and/or 107
as a part of an Add Traffic Stream (ADDTS) Request frame. The ADDTS
frame received from a wireless communication device may include a
suitable TSPEC Information Element (IE) and/or field, which may
include the TSPEC information corresponding to the wireless
communication device. In other embodiments, wireless communication
unit 112 may receive the TSPEC information as part of any other
suitable frame and/or communication and/or in any other suitable
format.
[0037] In some demonstrative embodiments, the TSPEC information
corresponding to a wireless communication device, as received by
wireless communication unit 112, may include traffic flow
information defining a traffic flow between the wireless
communication device and wireless communication unit 112. The TSPEC
information corresponding to the wireless communication device may
include, for example, one or more of a traffic pattern of the
traffic flow, a Quality of Service (QoS) of the traffic flow,
and/or any other series of requirements, parameters,
characteristics and/or expectations of a traffic flow. For example,
wireless communication unit 112 may receive a first ADDTS frame
from wireless communication device 104, including traffic flow
information, e.g., a traffic pattern and/or a QoS, defining a
traffic flow between wireless communication device 104 and wireless
communication unit 112; a second ADDTS frame from wireless
communication device 106, including traffic flow information, e.g.,
a traffic pattern and/or a QoS, defining a traffic flow between
wireless communication device 106 and wireless communication unit
112; and/or a third ADDTS frame from wireless communication device
107, including traffic flow information, e.g., a traffic pattern
and/or a QoS, defining a traffic flow between wireless
communication device 107 and wireless communication unit 112.
[0038] In some demonstrative embodiments, the TSPEC information,
received by wireless communication unit 112 from a wireless
communication device, may include a directionality of the traffic
flow between the wireless communication device and wireless
communication unit 112. The directionality of the traffic flow may
be determined, for example, based on the traffic pattern of the
traffic flow. For example, the directionality of the traffic flow
may include an uplink traffic flow, e.g., including uplink
transmissions from the wireless communication device to wireless
communication unit 112; a downlink traffic flow, e.g., including
downlink transmissions from wireless communication unit 112 to the
wireless communication device; or a bidirectional traffic flow,
e.g., including both uplink transmissions and downlink
transmissions.
[0039] In some demonstrative embodiments, the QoS of the traffic
flow may include, for example, a QoS parameter representing, for
example, a priority type of the traffic flow, e.g., guaranteeing a
certain level of performance. The priority type of the traffic flow
may be selected, for example, from a set of predefined priority
types. In one example, the QoS of the traffic flow may be selected
from a set of four predefined priority types, for example, a video
priority type, an audio (voice) priority type, a best effort
priority type, and a background priority type, e.g., as defined by
the 802.11 standard and/or any other suitable standard.
[0040] In some demonstrative embodiments, the traffic flow
corresponding to a wireless communication device may be categorized
as an isochronous traffic flow, for example, if the traffic flow
includes a time-dependent traffic flow, e.g., including video
and/or voice data; and/or as an asynchronous traffic flow, for
example, if the traffic flow is not time-dependent, e.g., if the
traffic flow does not include video or voice data.
[0041] In some demonstrative embodiments, wireless communication
unit 112 may assign wireless communication devices 104, 106 and/or
107 to one or more groups, e.g., including group 130, based on the
categorization and/or directionality of the traffic flows
corresponding to wireless communication devices 104, 106 and/or
107.
[0042] In some demonstrative embodiments, wireless communication
unit 112 may assign wireless communication devices 104, 106 and/or
107 to an uplink isochronous group, a downlink isochronous group, a
bidirectional isochronous group, and/or a bi-directional
asynchronous group. In other embodiments, wireless communication
unit 112 may assign wireless communication devices 104, 106 and/or
107 to any other suitable group.
[0043] In some demonstrative embodiments, wireless communication
unit 112 may assign a wireless communication device of devices 104,
106 and 107 to the uplink isochronous group, for example, if the
TSPEC information corresponding to the wireless communication
device represents an uplink traffic pattern including at least one
of video and voice data; wireless communication unit 112 may assign
the wireless communication device to the downlink isochronous group
if the TSPEC information corresponding to the wireless
communication device represents a downlink traffic pattern
including at least one of video and voice data; wireless
communication unit 112 may assign the wireless communication device
to the bi-directional isochronous group if the TSPEC information
corresponding to the wireless communication device represents a
bidirectional traffic pattern including at least one of video and
voice data; and/or wireless communication unit 112 may assign the
wireless communication device to the bi-directional asynchronous
group if the TSPEC information corresponding to the wireless
communication device represents another traffic pattern.
[0044] Although some embodiments are described herein with
reference to assigning a wireless communication device to a group
based on the TSPEC information corresponding to the wireless
communication device, other embodiments may include one or more
wireless communication devices assigned to a group based on any
other suitable criteria.
[0045] In some demonstrative embodiments, wireless communication
unit 112 may assign wireless communication devices 104, 106 and 107
to group 130, and provide to wireless communication devices 104,
106 and/or 107 suitable group allocation information defining group
130 and/or relating to group 130.
[0046] In some demonstrative embodiments, wireless communication
unit 112 may assign to group 130 a wireless communication address
(also referred to as "group address" or "multicast address"). The
group address assigned to group 130 may include, for example, a
suitable Media-Access-Control (MAC) address, which may be assigned
uniquely, e.g., within system 100 and/or a Basic-Service-Set (BSS)
controlled and/or managed by wireless communication unit 112.
[0047] In some demonstrative embodiments, wireless communication
unit 112 may inform wireless communication devices 104, 106 and/or
107 of the group address assigned to group 130, for example, using
any suitable transmission, frame and/or packet. For example,
wireless communication unit 112 may transmit one or more unicast
frames to wireless communication devices 104, 106 and/or 107, e.g.,
a first group allocation frame addressed to wireless communication
device 104, a second group allocation frame addressed to wireless
communication device 106 and/or a third group allocation frame
addressed to wireless communication device 107. The first, second
and third group allocation frames may include, for example, the
group address of group 130.
[0048] In some demonstrative embodiments, wireless communication
unit 112 may determine, e.g., based on any suitable criteria, an
order at which wireless communication devices 104, 106 and/or 107
are to respond to a transmission from wireless communication unit
112, for example, such that wireless communication devices 104, 106
and 107 may respond during non-overlapping time periods, e.g., as
described below. For example, wireless communication unit 112 may
determine that wireless communication device 106 is to respond to
the transmission from wireless communication unit 112 a first
offset time after the transmission from wireless communication unit
112, that wireless communication device 104 is to respond to the
transmission from wireless communication unit 112 a second offset
time, which is longer than the first offset time after the
transmission, and/or that wireless communication device 107 is to
respond to the transmission from wireless communication unit 112 a
third offset time, which is longer than the second offset time
after the transmission. A difference between the second and first
offset times and/or difference between the third and second offset
times may be at least equal to a duration of the responses from
wireless communication devices 104 and/or 106, e.g., to allow
wireless communication devices 104, 106 and 107 to respond during
non-overlapping periods.
[0049] In some demonstrative embodiments, wireless communication
unit 112 may include an indication of the required order, e.g., in
the group allocation frame. For example, the group allocation frame
may include values, for example in the form of suitable Association
Identifiers (AIDs) and/or suitable MAC addresses, representing
wireless communication devices 104, 106 and 107 according to the
required order. For example, the group allocation frame may include
a value representing the MAC address of wireless communication
device 106 followed by a value representing the MAC address of
wireless communication device 104, which in turn may be followed by
a value representing the MAC address of wireless communication
device 107, e.g., if wireless communication device 106 is to
respond to wireless communication unit 112 prior to a response from
wireless communication device 104, which in turn is to respond to
wireless communication unit 112 prior to a response from wireless
communication device 107.
[0050] In some demonstrative embodiments, wireless communication
devices 104, 106 and/or 107 may each determine the order at which
to respond to wireless communication unit 112, based on the
indication of the required order.
[0051] In some embodiments, wireless communication devices 104, 106
and/or 107 may transmit the responses at a data rate equal to a
data rate of the transmission from wireless communication unit 112,
e.g., in order to allow wireless communication devices 104, 106
and/or 107 to schedule the transmission of the responses, such that
wireless communication device 112 may be able to receive the
responses.
[0052] In another embodiment, wireless communication units 104, 106
and/or 107 may transmit the responses at a selected predefined data
rate for communication with wireless communication unit 112. In one
example, wireless communication units 104, 106 and/or 107 may
transmit the responses at a data rate, which is selected from a
predefined set of data rates implemented for communication in
system 100, e.g., the BSSBasicRateSet as defined by the 802.11
standards. For example, wireless communication units 104, 106
and/or 107 may transmit the responses at a highest data rate of the
BSSBasicRateSet, which is less than or equal to a rate of an
immediately previous frame received from wireless communication
unit 112.
[0053] In some demonstrative embodiments, wireless communication
unit 112 may assign wireless communication devices 104, 106 and/or
107 to group 130, for example, while not directly providing
wireless communication units 104, 106 and/or 107 with information
defining group 130 and/or relating to group 130. According to this
example, wireless communication unit 112 may simultaneously
transmit downlink transmissions to devices of group 130, e.g.,
while one or more of the wireless communication devices of group
130 may not be aware of the simultaneous transmission to other
devices in group 130, for example, if the one or more wireless
communication devices are not required to and/or is not able to
transmit uplink SDMA transmissions to wireless communication unit
112. For example, wireless communication unit 112 may transmit a
downlink SDMA transmission to a wireless communication device,
e.g., device 107, while the wireless communication device may not
be aware of the fact that the downlink transmission is a downlink
SDMA transmission, for example, if wireless communication device
107 is not required to and/or is not able to transmit uplink SDMA
transmissions to wireless communication unit 112.
[0054] In some demonstrative embodiments, wireless communication
unit 112 may reserve wireless communication medium 110 for a time
period, during which wireless communication unit 112 is to
simultaneously transmit two or more different wireless
communication transmissions to two or more wireless communication
devices of group 130, respectively, e.g., as described in detail
below.
[0055] Reference is also made to FIG. 2, which schematically
illustrates a sequence of transmissions between a wireless
communication device, e.g., wireless communication device 102 (FIG.
1) and/or wireless communication unit 112 (FIG. 1), and a group of
other wireless communication devices, e.g., group 130 (FIG. 1), in
accordance with some demonstrative embodiments.
[0056] As shown in FIG. 2, a timeline 202 includes transmissions by
the wireless communication device, e.g., wireless communication
unit 112 (FIG. 1); a timeline 204 includes transmissions by a first
wireless communication device of the group, e.g., wireless
communication device 104 (FIG. 1); a timeline 206 includes
transmissions by a second wireless communication device of the
group, e.g., wireless communication device 106 (FIG. 1); and a
timeline 208 includes transmissions by a third wireless
communication device of the group, e.g., wireless communication
device 107 (FIG. 1).
[0057] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may reserve wireless communication medium 110
(FIG. 1) for at least a time period 215, during which wireless
communication unit 112 (FIG. 1) is to simultaneously transmit two
or more different wireless communication transmissions 214 to two
or more wireless communication devices of group 130,
respectively.
[0058] In some demonstrative embodiments, transmissions 214 may be
transmitted as part of a SDMA transmission including three, e.g.,
different, data packets, denoted data1, data2, and data3, e.g.,
three aggregate MAC protocol data unit (AMPDUs), to be received by
wireless communication devices 104, 106 and/or 107, respectively.
In one example, the three data packets data1, data2, and data3 may
include data packets of different lengths. According to this
example, the reserved duration 215 may correspond to at least the
length of the longest data packet.
[0059] In some demonstrative embodiments, reserved time period 215
may include at least the transmission duration of transmissions 214
and/or any one or more uplink and/or downlink transmissions
associated with transmissions 214, for example, one or more uplink
and/or downlink transmissions to confirm and/or acknowledge receipt
of transmissions 214, e.g., as described below.
[0060] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may reserve medium 110 (FIG. 1) according to a
first reservation scheme 212 by transmitting at least one
Request-To-Send (RTS) packet 219 to one or more wireless
communication devices of group 130 (FIG. 1). The RTS packet 219 may
include a duration value corresponding to the time period to be
reserved 215. For example, a duration filed of RTS packet 219 may
be set by wireless communication unit 112 (FIG. 1) to include a
value corresponding to the time period to be reserved 215.
[0061] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may transmit RTS packet 219 addressed to the
wireless communication devices of group 130 (FIG. 1). For example,
wireless communication unit 112 (FIG. 1) may transmit RTS packet
219 including the group address assigned to group 130, for example,
after informing wireless communication devices 104, 106 and/or 107
of the group address, e.g., as described above.
[0062] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may receive one or more clear-to-send (CTS)
packets from one or more wireless communication devices of group
130 (FIG. 1), e.g., in response to RTS packet 219. For example,
wireless communication unit 112 (FIG. 1) may receive a first CTS
packet 222 from wireless communication device 104 (FIG. 1) and a
second CTS packet 224 from wireless communication device 106 (FIG.
1). As shown in FIG. 2, in one example, wireless communication unit
112 (FIG. 1) may not receive a CTS packet from one or more devices
of group 130 (FIG. 1), e.g., from wireless communication device 107
(FIG. 1), e.g., due to a collision, interference and/or any other
reason.
[0063] As shown in FIG. 2., in some demonstrative embodiments CTS
packets 222 and 224 may be transmitted by wireless communication
devices 104 and 106 (FIG. 1) substantially simultaneously and/or
CTS packets 222 and 224 may be received substantially
simultaneously by wireless communication unit 112 (FIG. 1), for
example, if wireless communication devices 104 and/or 106 support
uplink SDMA transmissions.
[0064] In some demonstrative embodiments, CTS packets 222 and 224
may be identical to one another. For example, both wireless
communication devices 104 and 106 may generate CTS packets 222 and
224, respectively, using a common scrambling seed, e.g., the
scrambling seed of RTS packet 219.
[0065] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may receive and decode CTS packets 222 and 224. A
wireless communication device of system 100 (FIG. 1) not belonging
to group 130 (FIG. 1), e.g., wireless communication device 108
(FIG. 1), may receive CTS packets 222 and/or 224. Since CTS packets
222 and 224 may be identical to one another, the wireless
communication device may decode CTS packets 222 and 224, e.g.,
assuming packets 222 and 224 have resulted from a multi-path
effect.
[0066] In some demonstrative embodiments, another wireless
communication device of system 100 (FIG. 1) receiving CTS packets
222 and/or 224, for example, a wireless communication device of
group 130 (FIG. 1), e.g., wireless communication device 107, and/or
a wireless communication device not included in group 130 (FIG. 1),
e.g., wireless communication device 108 (FIG. 1), may avoid
performing transmissions over wireless communication medium 110
(FIG. 1) during reserved time period 215.
[0067] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may simultaneously transmit transmissions 214 to
two or more wireless communication devices ("the two or more
addressed devices") of group 130. The two or more addressed devices
may include two or more wireless communication devices of group 130
(FIG. 1) from which wireless communication unit 112 (FIG. 1) has
received two or more CTS packets, respectively. For example, if
wireless communication unit 112 (FIG. 1) receives CTS packets 222
and 224, then wireless communication unit 112 (FIG. 1) may transmit
transmission 214 including the data packets data1 and data2
intended for wireless communication devices 104 and 106 (FIG. 1),
respectively, e.g., while not including the data packet data3
intended for wireless communication device 107 (FIG. 1), from which
a CTS packet has not been received by wireless communication unit
112 (FIG. 1).
[0068] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may reserve medium 110 (FIG. 1) according to a
second reservation scheme 210 by transmitting a data packet 218,
including a duration value corresponding to the time period to be
reserved 215, to at least one of the wireless communication devices
of group 130, e.g., to wireless communication device 107 (FIG. 1).
For example, a duration filed of data packet 218 may be set by
wireless communication unit 112 (FIG. 1) to include a value
corresponding to the time period to be reserved 215. Wireless
communication device 107 (FIG. 1) may respond with a suitable
acknowledgment (ACK) packet 220. As a result, another wireless
communication device of system 100 (FIG. 1) receiving data packet
218 and/or ACK 220, for example, a wireless communication device of
group 130 (FIG. 1), e.g., wireless communication devices 104 and/or
106, and/or a wireless communication device not included in group
130 (FIG. 1), e.g., wireless communication device 108 (FIG. 1), may
avoid performing transmissions over wireless communication medium
110 (FIG. 1) during reserved time period 215.
[0069] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may simultaneously transmit transmissions 214 to
the two or more addressed wireless communication devices of group
130 (FIG. 1). For example, wireless communication unit 112 (FIG. 1)
may transmit transmission 214 including the simultaneous
transmission of data packets data1, data2 and data3 to wireless
communication devices 104, 106 and 107 (FIG. 1), respectively.
[0070] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may transmit at least one
block-acknowledgement-request (BAR) 216 to the two or more
addressed devices. In one embodiment, wireless communication unit
112 (FIG. 1) may simultaneously transmit BAR 216 as part of a
downlink SDMA transmission to the two or more addressed devices. In
other embodiments, wireless communication unit 112 (FIG. 1) may
transmit BAR 216 as part of two or more separate unicast
transmissions to the two or more addressed devices,
respectively.
[0071] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may receive from the two or more addressed
devices two or more respective block-acknowledgments (BAs). For
example, wireless communication unit 112 (FIG. 1) may transmit BAR
216 as part of a downlink SDMA transmission to wireless
communication devices 104, 106 and/or 107 (FIG. 1) and, in
response, wireless communication unit 112 (FIG. 1) may receive BA
232 from wireless communication unit 104 (FIG. 1), BA 234 from
wireless communication unit 106 (FIG. 1) and/or BA 236 from
wireless communication unit 107 (FIG. 1).
[0072] As shown in FIG. 2, wireless communication devices 104, 106
and/or 107 (FIG. 1) may be capable of performing uplink SDMA
transmissions. For example, as shown in FIG. 2, CTS packets 222 and
224 may be transmitted by wireless communication devices 104 and
106 (FIG. 1) substantially simultaneously; CTS packets 222 and 224
may be received substantially simultaneously by wireless
communication unit 112 (FIG. 1); BA 232, BA 234 and 236 may be
transmitted by wireless communication devices 104, 106 and 107
(FIG. 1), respectively, substantially simultaneously; and/or BA 232
and 234 may be received by wireless communication unit 112 (FIG. 1)
substantially simultaneously. However, in other embodiments, uplink
transmissions from wireless communication devices 104, 106 and/or
107 (FIG. 1) may be performed sequentially, e.g., as described
below.
[0073] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may determine the order ("the response order") at
which wireless communication devices 104, 106 and/or 107 (FIG. 1)
are to respond to transmissions from wireless communication unit
112 (FIG. 1), for example, if wireless communication devices 104,
106 and/or 107 (FIG. 1) do not support SDMA uplink transmissions.
Wireless communication unit 112 (FIG. 1) may inform wireless
communication devices 104, 106 and/or 107 (FIG. 1) of the response
order, e.g., using the group allocation frame, as described above.
In other embodiments, the response order at which wireless
communication devices 104, 106 and/or 107 (FIG. 1) are to respond
to transmissions from wireless communication unit 112 (FIG. 1) may
be determined and/or provided to wireless communication devices
104, 106 and/or 107 (FIG. 1) according to any other suitable
criterion and/or scheme.
[0074] In some demonstrative embodiments, wireless communication
units 104 and/or 106 (FIG. 1) may transmit respective CTS packets
222 and 224 sequentially and/or wireless communication units 104,
106 and/or 107 (FIG. 1) may transmit respective BA packets 232, 234
and 236 sequentially, e.g., according to the response order. For
example, wireless communication unit 112 (FIG. 1) may allocate a
first response period to wireless communication device 104 (FIG.
1), and a second response period, succeeding the first period, to
wireless communication device 106, for transmitting CTS packets 222
and 224, respectively. For example, the beginning of the second
response period may be delayed, with respect to the beginning of
the first response period, by the combined duration of a CTS packet
transmission and a short-inter-frame- space (SIFS) period, and/or
any other time period. Accordingly, wireless communication device
104 (FIG. 1) may transmit CTS packet 222 during the first response
period, and wireless communication device 106 (FIG. 1) may transmit
CTS packet 224 during the second time period, such that the
transmissions of CTS packets 222 and 224 do not overlap. Similarly,
if the response order defines wireless communication device 107
(FIG. 1) is to respond after wireless communication device 106
(FIG. 1), which in turn is to respond after wireless communication
unit 104 (FIG. 1), then wireless communication unit 106 (FIG. 1)
may begin the transmission of BA 234 at a BA delay, e.g., equal to
the combined duration of a BA transmission and a SIFS, after the
beginning of the transmission of BA 232; and/or wireless
communication unit 107 (FIG. 1) may begin the transmission of BA
236 at the BA after the beginning of the transmission of BA 234.
Accordingly, wireless communication devices 104, 106 and/or 107
(FIG. 1) may sequentially transmit BAs 232, 234 and/or 236,
respectively, such that the transmissions of BAs 232, 234 and 236
do not overlap.
[0075] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may include in one or more of transmissions 214,
e.g., in each of transmissions 214, an indication of the duration
of a longest transmission of transmissions 214. For example,
wireless communication unit 112 (FIG. 1) may include in each of
data packets data1, data2, and data 3 an indication of the duration
of a longest one of data packets data1, data2, and data 3. In one
example, transmissions 214 include AMPDUs, and wireless
communication unit 112 (FIG. 1) may include an indication of the
duration of the longest AMPDU in each one of the AMPDUs, e.g., in
the L-SIG field. Accordingly, each of wireless communication
devices 104, 106 and 107 (FIG. 1) may determine when transmissions
214 are to end. At the end of transmissions 214, wireless
communication devices 104, 106 and/or 107 (FIG. 1) may transmit BAs
232, 234 and/or 236, respectively, e.g., without having to receive
BAR 216. Wireless communication devices 104, 106 and/or 107 (FIG.
1) may transmit BAs 232, 234 and/or 236, respectively, in a
simultaneous manner, e.g., if uplink SDMA is supported, or
sequentially, e.g., if uplink SDMA is not supported, e.g., as
discussed above.
[0076] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may transmit RTS packet 219 in the form of an
Extended RTS (ERTS) intended for only some wireless communication
devices ("the selected devices") of group 130 (FIG. 1), e.g., to
which wireless communication unit 112 (FIG. 1) has buffered
traffic. The ERTS packet may also indicate the response order of
the selected devices. Accordingly, wireless communication unit 112
(FIG. 1) may receive CTS packets from only the selected devices,
e.g., according to the response order, and transmit transmissions
214 to the intended devices. Wireless communication unit 112 (FIG.
1) may transmit an Extended BAR (EBAR) to schedule BA transmissions
from only the selected devices.
[0077] Referring back to FIG. 1, in some demonstrative embodiments,
wireless communication unit 112 may determine a beamforming (BF)
scheme for communicating with devices 104, 106 and/or 107 by
performing a beamforming training sequence including an exchange of
at least one simultaneous transmission with two or more devices
104, 106 and 107. The beamforming training sequence may include an
implicit beamforming sequence and/or an explicit beamforming
sequence, e.g., as described below.
[0078] Reference is also made to FIG. 3, which schematically
illustrates another sequence of transmissions between a wireless
communication device, e.g., wireless communication device 102 (FIG.
1) and/or wireless communication unit 112 (FIG. 1), and a group of
other wireless communication devices, e.g., group 130 (FIG. 1), in
accordance with some demonstrative embodiments.
[0079] As shown in FIG. 3, a timeline 302 includes transmissions by
the wireless communication device, e.g., wireless communication
unit 112 (FIG. 1); a timeline 304 includes transmissions by a first
wireless communication device of the group, e.g., wireless
communication device 104 (FIG. 1); a timeline 306 includes
transmissions by a second wireless communication device of the
group, e.g., wireless communication device 106 (FIG. 1); and a
timeline 308 includes transmissions by a third wireless
communication device of the group, e.g., wireless communication
device 107 (FIG. 1).
[0080] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may transmit at least one beamforming-training
initiation frame 310 to two or more wireless communication devices
of group 130 (FIG. 1). Wireless communication unit 112 (FIG. 1) may
receive two or more feedback frames from the two or more wireless
communication devices. For example, wireless communication unit 112
(FIG. 1) may receive feedback frames 312, 314 and/or 316 from
wireless communication devices 104, 106 and/or 107 (FIG. 1),
respectively.
[0081] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may determine two or more beamforming schemes
based on the two or more feedback frames. For example, wireless
communication unit 112 (FIG. 1) may implement any suitable
beamforming training and/or detection method to determine the
beamforming schemes to be used for communicating with wireless
communication devices 104, 106 and/or 107 (FIG. 1) based on
feedback frames 312, 314 and/or 316, respectively.
[0082] In some demonstrative embodiments, initiation frame 310 and
feedback frames 312, 314 and/or 316 may be exchanged as part of an
implicit beamforming training sequence. For example, initiation
frame 310 may include a Training Request (TRQ, also referred to as
a sounding request) and/or feedback frames 312, 314 and/or 316 may
include suitable channel sounding frames. In one embodiment,
initiation frame 310 may include any suitable management, control
and/or data frame, which may include a TRQ bit set to a predefined
value, e.g., one, indicating that initiation frame 310 is to be
treated as a TRQ.
[0083] In some demonstrative embodiments, initiation frame 310 and
feedback frames 312, 314 and/or 316 may be exchanged as part of an
explicit beamforming training sequence. For example, initiation
frame 310 may include a suitable channel sounding frame and/or
feedback frames 312, 314 and/or 316 may include beamforming
feedback frames in response to the sounding frame.
[0084] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may transmit initiation frame 310 including the
group address assigned to group 130 (FIG. 1), e.g., as described
above. Initiation frame 310 may be transmitted in the form of an
extended frame, e.g., an Extended TRQ (ETRQ), including the
response order assigned to the wireless communication devices of
group 130 (FIG. 1), e.g., as described above, for example, to
inform wireless communication devices 104, 106 and/or 107 (FIG. 1)
of an order at which feedback frames 312, 314 and/or 316 are to be
transmitted sequentially. Wireless communication devices 104, 106
and/or 107 (FIG. 1) may respond to initiation frame 310 by sending
feedback frames 312, 314 and/or 316 including suitable sounding
frames.
[0085] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may transmit an individual initiation frame 310
to each of wireless communication devices 104, 106 and/or 107 (FIG.
1), e.g., as part of a unicast transmission.
[0086] In some demonstrative embodiments, wireless communication
unit 112 (FIG. 1) may transmit two or more different wireless
communication transmissions 318 to the two or more wireless
communication devices, respectively, using the two or more
beamforming schemes, respectively. For example, wireless
communication unit 112 (FIG. 1) may transmit transmissions 318 as
part of a SDMA scheme, e.g., as described above. In one example,
wireless communication unit 112 (FIG. 1) may transmit a BAR 320
following transmissions 318 and/or receive BAs 322, 324 and/or 326
in response to BAR 320, e.g., as described above.
[0087] Reference is made to FIG. 4, which schematically illustrates
a method of simultaneously communicating with a group of wireless
communication devices, in accordance with some demonstrative
embodiments. In some embodiments, one or more operations of the
method of FIG. 4 may be performed by system 100 (FIG. 1) and/or one
or more of devices 102, 104, 106, 107 and/or 108 (FIG. 1).
[0088] As indicated at block 402, the method may include reserving,
by a wireless communication unit, a wireless communication medium
for a time period. For example, wireless communication unit 112
(FIG. 1) may reserve wireless communication medium 110 (FIG. 1),
e.g., as described above.
[0089] As indicated at block 406, in some embodiments reserving the
wireless communication medium may include transmitting at least one
RTS packet to one or more wireless communication devices of the
group, wherein the request-to-send packet includes a duration value
corresponding to the time period to be reserved. For example,
wireless communication unit 112 (FIG. 1) may transmit RTS packet
219 (FIG. 2), e.g., as described above. The RTS packet may include
the group address assigned to the group of wireless communication
devices, e.g., as described above.
[0090] As indicated at block 408, the method may include
transmitting the transmissions to the two or more wireless
communication devices after receiving two or more CTS packets from
the two or more wireless communication devices, in response to the
request-to-send packet. For example, wireless communication unit
112 (FIG. 1) may transmit transmissions 214 (FIG. 2) after
receiving CTS packets 222 and 224 (FIG. 2), e.g., as described
above. The two or more CTS packets may be identical, e.g., as
described above.
[0091] As indicated at block 410, in some embodiments reserving the
wireless communication medium may include transmitting a data
packet to at least one of the wireless communication devices of the
group, wherein the packet includes a duration value corresponding
to the time period to be reserved. For example, wireless
communication unit 112 (FIG. 1) may transmit packet 218 (FIG. 2),
e.g., as described above.
[0092] As indicated at block 404, the method may include
simultaneously transmitting, during the reserved time period, two
or more different wireless communication transmissions from the
wireless communication unit to two or more respective wireless
communication devices of a group of a plurality of wireless
communication devices. For example, wireless communication unit 112
(FIG. 1) may transmit transmissions 214 (FIG. 2) to two or more
wireless communication devices of group 130 (FIG. 1) during the
reserved time period, e.g., as described above.
[0093] As indicated at block 412, in some embodiments the method
may include determining a beamforming scheme for communicating with
the wireless communication devices of the group.
[0094] As indicated at block 414, the method may include
transmitting at least one beamforming-training initiation frame
from the wireless communication unit to the group of wireless
communication devices. For example, wireless communication unit 112
(FIG. 1) may transmit frame 310 (FIG. 3), e.g., as described
above.
[0095] As indicated at block 416, the method may include receiving
at the wireless communication unit two or more feedback frames from
the two or more wireless communication devices. For example,
wireless communication unit 112 (FIG. 1) may receive frames 312,
314 and/or 316 (FIG. 3), e.g., as described above.
[0096] As indicated at block 418, the method may include
determining two or more beamforming schemes based on the two or
more feedback frames. For example, wireless communication unit 112
(FIG. 1) may determine the beamforming schemes to be used for
communicating with wireless communication devices 104, 106 and/or
107 (FIG. 1) based on frames 312, 314 and/or 316 (FIG. 3),
respectively, e.g., as described above.
[0097] As indicated at block 420, the method may include
transmitting the two or more different wireless communication
transmissions to the two or more wireless communication devices,
respectively, using the two or more beamforming schemes,
respectively. For example, wireless communication unit 112 (FIG. 1)
may transmit transmissions 318 (FIG. 3) using the beamforming
schemes corresponding to wireless communication devices 104, 106
and/or 107 (FIG. 1), e.g., as described above.
[0098] Reference is made to FIG. 5, which schematically illustrates
an article of manufacture 500, in accordance with some
demonstrative embodiments. Article 500 may include a
machine-readable storage medium 502 to store logic 504, which may
be used, for example, to perform at least part of the functionality
of wireless communication unit 112 (FIG. 1) and/or to perform one
or more operations of the method of FIG. 4.
[0099] In some demonstrative embodiments, article 500 and/or
machine-readable storage medium 502 may include one or more types
of computer-readable storage media capable of storing data,
including volatile memory, non-volatile memory, removable or
non-removable memory, erasable or non-erasable memory, writeable or
re-writeable memory, and the like. For example, machine-readable
storage medium 502 may include, RAM, DRAM, Double-Data-Rate DRAM
(DDR-DRAM), SDRAM, static RAM (SRAM), ROM, programmable ROM (PROM),
erasable programmable ROM (EPROM), electrically erasable
programmable ROM (EEPROM), Compact Disk ROM (CD-ROM), Compact Disk
Recordable (CD-R), Compact Disk Rewriteable (CD-RW), flash memory
(e.g., NOR or NAND flash memory), content addressable memory (CAM),
polymer memory, phase-change memory, ferroelectric memory,
silicon-oxide-nitride-oxide-silicon (SONOS) memory, a disk, a
floppy disk, a hard drive, an optical disk, a magnetic disk, a
card, a magnetic card, an optical card, a tape, a cassette, and the
like. The computer-readable storage media may include any suitable
media involved with downloading or transferring a computer program
from a remote computer to a requesting computer carried by data
signals embodied in a carrier wave or other propagation medium
through a communication link, e.g., a modem, radio or network
connection.
[0100] In some demonstrative embodiments, logic 504 may include
instructions, data, and/or code, which, if executed by a machine,
may cause the machine to perform a method, process and/or
operations as described herein. The machine may include, for
example, any suitable processing platform, computing platform,
computing device, processing device, computing system, processing
system, computer, processor, or the like, and may be implemented
using any suitable combination of hardware, software, firmware, and
the like.
[0101] In some demonstrative embodiments, logic 504 may include, or
may be implemented as, software, a software module, an application,
a program, a subroutine, instructions, an instruction set,
computing code, words, values, symbols, and the like. The
instructions may include any suitable type of code, such as source
code, compiled code, interpreted code, executable code, static
code, dynamic code, and the like. The instructions may be
implemented according to a predefined computer language, manner or
syntax, for instructing a processor to perform a certain function.
The instructions may be implemented using any suitable high-level,
low-level, object-oriented, visual, compiled and/or interpreted
programming language, such as C, C++, Java, BASIC, Matlab, Pascal,
Visual BASIC, assembly language, machine code, and the like.
[0102] Functions, operations, components and/or features described
herein with reference to one or more embodiments, may be combined
with, or may be utilized in combination with, one or more other
functions, operations, components and/or features described herein
with reference to one or more other embodiments, or vice versa.
[0103] While certain features of the invention have been
illustrated and described herein, many modifications,
substitutions, changes, and equivalents may occur to those skilled
in the art. It is, therefore, to be understood that the appended
claims are intended to cover all such modifications and changes as
fall within the true spirit of the invention.
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