Source: http://patents.com/us-9854498.html
Timestamp: 2018-12-10 17:19:45
Document Index: 712455568

Matched Legal Cases: ['art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'Application No. 61', 'Application No. 61']

US Patent # 9,854,498. Method and apparatus for providing very high throughput operation and capability signaling for wireless communications - Patents.com
United States Patent 9,854,498
Grandhi December 26, 2017
A method and apparatus are disclosed for enabling very high throughput (VHT) communications. A wireless transmit and receive unit (WTRU) may receive, from an access point (AP), a management frame comprising VHT capabilities information. The VHT capabilities information may comprise an indication of support for reception via non-contiguous channels. The WTRU may transmit, on a condition that reception via non-contiguous channels is supported, at least one data packet, to the AP, via multiple non-contiguous channels. The multiple non-contiguous channels may be used simultaneously.
Grandhi; Sudheer A. (Pleasanton, CA)
Family ID: 1000003031407
15/207,230
US 20160323802 A1 Nov 3, 2016
14733226 Jun 8, 2015 9392524
14197703 Jun 9, 2015 9055510
12945278 Apr 29, 2014 8711820
61260552 Nov 12, 2009
61260639 Nov 12, 2009
Current CPC Class: H04W 40/04 (20130101); H04W 28/18 (20130101); H04W 52/04 (20130101); H04W 48/14 (20130101); H04W 88/08 (20130101); H04W 84/12 (20130101)
Current International Class: H04W 40/04 (20090101); H04W 48/14 (20090101); H04W 52/04 (20090101); H04W 28/18 (20090101); H04W 84/12 (20090101); H04W 88/08 (20090101)
8175047 May 2012 Seok et al.
2005/0136921 June 2005 Stephens
2006/0253736 November 2006 Rudolf et al.
2007/0258384 November 2007 Sammour et al.
2011/0044273 February 2011 Maltsev et al.
2011/0090821 April 2011 Seok
2011/0096747 April 2011 Seok
2011/0128900 June 2011 Seok
2011/0188487 August 2011 Seok
2012/0076091 March 2012 Seok
2012/0087300 April 2012 Seok
1677915 Oct 2005 CN
1891005 Jan 2007 CN
2008-512954 Apr 2008 JP
2008-538465 Oct 2008 JP
2009-529292 Aug 2009 JP
2011-503997 Jan 2011 JP
WO 2006-031495 Mar 2006 WO
WO 2006-132467 Dec 2006 WO
WO 2009-119834 Oct 2009 WO
WO 2009-136701 Nov 2009 WO
Institute of Electrical and Electronics Engineers, "Draft Standard for Information Technology--Telecommunications and Information Exchange Between Systems--Local and Metropolitan Area Networks--Specific Requirements--Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications--Amendment 5: Enhancements for Very High Throughput in the 60 GHz Band," IEEE P802.11ad/D1.0, Sep. 2010. cited by applicant .
Institute of Electrical and Electronics Engineers, Draft Standard for Information Technology--Telecommunications and Information Exchange Between Systems--Local and Metropolitan Area Networks--Specific Requirements--Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications--Enhancements for Higher Throughput, IEEE P802.11n/D2.0, Feb. 2007. cited by applicant .
LAN/MAN Committee of the IEEE Society, "Draft Standard for information technology--Telecommunications and information exchange between systems--Local metropolitan area networks--Specifics requirements Part 11: Wireless LAN Medium Control (MAC) and Physical Layer (PHY) specifications," IEEE, P802.11-REVma/D9.0, Dec. 2006. cited by applicant .
Institute of Electrical and Electronics Engineers, "Draft Standard for Information Technology--Telecommunications and Information Exchange Between Systems--Local and Metropolitan Area Networks--Specific Requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications" IEEE P802.11-REVma(TM)D8.09.0 (Revision of IEEE Std 802.11-1999), 1230 pages. cited by applicant .
Institute of Electrical and Electronics Engineers, "Draft Standard for Information Technology--Telecommunications and Information Exchange Between Systems--Local and Metropolitan Area Networks--Specific Requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications" IEEE P802.11-REVma/D9.0, Dec. 2006. cited by applicant .
Institute of Electrical and Electronics Engineers, "Draft Standard for Information Technology--Telecommunications and Information Exchange Between Systems--Local and Metropolitan Area Networks--Specific Requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications" P802.11/D2.00, IEEE Draft Std P802.11n/D2.00, Feb. 2007, 498 pages. cited by applicant .
Oterppe et al., "The wireless Side of Wireshark", Author of Aircrack-NG, Sep. 15, 2009, 79 pages. cited by applicant .
IEEE, Draft Amendment to STANDARD [FOR] Information Technology--Telecommunciations and information exchange between systems--Local and Metropolitan networks-Specific requirements, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Enhancements for Higher Throughput, IEEE P802.11n.TM./D0.01, Jan. 2006, 191 pages. cited by applicant .
IEEE "Strawmodel 802.11ac Specification Framework", IEEE 802.11-09/0633r0, May 2009, 30 pages. cited by applicant .
IEEE Standard for Information technology--Telecommunications and information exchange between systems--Local and metropolitan area networks--Specific requirements, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, IEEE Std 802.11--2007, 5 pages. cited by applicant .
IEEE Standard for Information technology--Telecommunications and information exchange between systems--Local and metropolitan area networks--Specific requirements, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, Amendment 5: Enhancements for Higher Throughput, IEEE Std. 802.11n--2009, 15 pages. cited by applicant .
Lauret Cariou, "Multi-channel Transmissions", IEEE 802.11-09-1022r0, Oct. 21, 2009, 13 pages. cited by applicant .
Sassan Ahmadi at. el, "Proposed Changes/Refinements to the Sections 4-9, 13, 14, and 17 of IEEE 802.16m SDD", IEEE 802.16 Broadband Wireless Access Working Group, IEEE C802.16m-09/1196r1, Jul. 13, 2009, 4 pages. cited by applicant .
Adrian Stephens, "Joint Proposal: High through put extension to the 802.11 Standard: MAC", IEEE 802.11-05/1095r5, Jan. 13, 2006, 4 pages. cited by applicant.
This application is a continuation of U.S. patent application Ser. No. 14/733,226, filed Jun. 8, 2015, which issued as U.S. Pat. No. 9,392,524 on Jul. 12, 2016, which is a continuation of U. S. patent application Ser. No. 14/197,703, filed Mar. 5, 2014, which issued as U.S. Pat. No. 9,055,510 on Jun. 9, 2015, which is a continuation of U.S. patent application Ser. No. 12/945,278, filed Nov. 12, 2010, which issued as U.S. Pat. No. 8,711,820 on Apr. 29, 2014, which claims the benefit of U.S. Provisional Patent Application No. 61/260,552, filed Nov. 12, 2009, and U.S. Provisional Patent Application No. 61/260,639, filed Nov. 12, 2009, the contents of each of which are hereby incorporated by reference herein.
1. A wireless transmit and receive unit (WTRU) comprising: a receiver configured to receive a management frame comprising very high throughput (VHT) capabilities information from an access point (AP), wherein the VHT capabilities information comprises an indication of support for reception via non-contiguous channels, an indication of support for a short guard interval (GI) for reception of packets with a channel bandwidth, an indiction for a support of channel widths supported, an indication for support of beamforming, an indication for support of VHT link adaptation, and an indication of whether the AP supports power save mode; and a transmitter configured to transmit at least one data packet to the AP via multiple non-contiguous channels on a condition that reception via non-contiguous channels is supported, wherein one of the multiple non-contiguous channels is a primary channel.
6. The WTRU of claim 1, wherein the channel bandwidth is 80MHz.
7. The WTRU of claim 1, wherein the indication for support of beamforming comprises an indication for support of multi-user beamforming.
8. A method of communicating very high throughput (VHT) capability information from a wireless transmit/receive unit (WTRU) comprising: receiving a management frame comprising VHT capabilities information from an access point (AP), wherein the VHT capabilities information comprises an indication of support for reception via non-contiguous channels an indication of support for a short guard interval (GI) for reception of packets with a channel bandwidth, an indication for a support of a channel widths support, an indication for support of beamforming, an indication for support of VHT link adaptation, and an indication of whether the AP supports power save mode; and transmitting at least one data packet to the AP via multiple non-contiguous channels on a condition that reception via non-contiguous channels is supported, wherein one of the multiple non-contiguous channels is a primary channel.
9. The method of claim 8, wherein the VHT capabilities information comprises power control information.
10. The method of claim 8, wherein the VHT capabilities information comprises frequency reuse capabilities.
11. The method of claim 8, wherein the non-contiguous channels are used simultaneously.
12. The method of claim 8 wherein each of the non-contiguous channels is formed from a group of contiguous channels.
13. The method of claim 8, wherein the channel bandwidth is 80MHz.
14. The method of claim 8, wherein the indication for support of beamforming comprises an indication for support of multi-user beamforming.
15. An access point (AP) comprising: a transmitter configured to transmit a management frame comprising very high throughput (VHT) capabilities information to a wireless transmit/receive unit (WTRU), wherein the VHT capabilities information comprises an indication of support for reception via non-contiguous channels an indication of support for a short guard interval (GI) for reception of packets with a channel bandwidth, an indication for a support of channel widths, an indication for support of beamforming, an indication for support of VHT link adaptation, and an indication of whether the AP supports power save mode; and a receiver configured to receive, via multiple non-contiguous channels, at least one data packet from the WTRU on a condition that reception via non-contiguous channels is supported, wherein one of the multiple non-contiguous channels is a primary channel.
16. The AP of claim 15, wherein the VHT capabilities information comprises power control information.
17. The AP of claim 15, wherein the VHT capabilities information comprises frequency reuse capabilities.
18. The AP of claim 15, wherein the non-contiguous channels are used simultaneously.
19. The AP of claim 15, wherein each of the non-contiguous channels is formed from a group of contiguous channels.
20. The AP of claim 15, wherein the channel bandwidth is 80MHz.
21. The AP of claim 15, wherein the indication for support of beamforming comprises an indication for support of multi-user beamforming.
22. A method of communicating very high throughput (VHT) capability information to an access point (AP), the method comprising: transmitting a management frame comprising very high throughput (VHT) capabilities information to a wireless transmit/receive unit (WTRU), wherein the VHT capabilities information comprises an indication of support for reception via non-contiguous channels, an indication of support for a short guard interval (GI) for reception of packets with a channel bandwidth, an indication for a support of channel widths, an indication for support of beamforming, an indication for support of VHT link adaption, and an indication of whether the AP supports power save mode; and receiving, on a condition that reception via non-contiguous channels is supported, at least one data packet from the WTRU via multiple non-contiguous channels, wherein one of the multiple non-contiguous channels is a primary channel.
23. The method of claim 22, wherein the VHT capabilities information comprises power control information.
24. The method of claim 22, wherein the VHT capabilities information comprises frequency reuse capabilities.
25. The method of claim 22, wherein the non-contiguous channels are used simultaneously.
26. The method of claim 22, wherein each of the non-contiguous channels is formed from a group of contiguous channels.
27. The method of claim 22, wherein the channel bandwidth is 80MHz.
28. The method of claim 22, wherein the indication for support of beamforming comprises an indication for support of multi-user beamforming.
The term "wireless transmit/receive unit (WTRU)" includes but is not limited to a station (WTRU), a user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a computer, a mobile internet device (MID) or any other type of device capable of operating in a wireless environment.
FIG. 2 shows an information element (IE) 160 in a medium access control (MAC) frame for the purpose of transferring information. A first field of the IE is an element identity (ID) field 165 that contains an ID specific to the IE. This is followed by a length field 170 that contains the length of the IE. The length field 170 is followed by a variable number of fields 175.sub.1, 175.sub.2, . . . , 175.sub.n specific to the IE 160.
The VHT operation information may be formatted as a newly defined VHT operation IE. FIG. 6 shows a structure of such a VHT operation IE. The element ID field 565 of the VHT operation IE has a newly defined value specifically for the VHT operation IE. The length field 570 contains the length of the VHT operation IE following the length field 570 or the total IE length. The fields 575 in the VHT operation IE, following the element ID field 565 and length field 570, may contain some or all of the VHT operation information described later. For example, in FIG. 6, there are "n" such fields. Note that one may choose any specific mapping of these fields to the VHT operation information and several mappings are possible and allowed within the scope of this invention.
TABLE-US-00001 TABLE 1 VHT Operation Information items Description VHT Primary Channel Channel number of channel considered as the primary channel (i.e. common channel of operation for all VHT devices in the VHT BSS) by the VHT AP in the BSS. Secondary Channel Depending on the bandwidth of Offsets (relative to operation (20/40/80 MHz), there may the VHT primary be one or more secondary channels for channel) for one the VHT BSS operation. An example of or more secondary the possible secondary channel channels (for configurations and corresponding 20/40/80 MHz total values (note that the exact numerical bandwidth) value may be chosen flexibly from the currently unused values within the range from 0 to 255) for the Secondary Channel Offset field corresponding to the VHT 80 MHz bandwidth transmission, VHT 40 MHz bandwidth transmission and VHT Multi-channel transmission is shown in Table 2, below. In one embodiment, the modified Secondary Channel Offset field which includes values for secondary channel configurations supporting VHT 80 MHz bandwidth transmission, VHT 40 MHz bandwidth transmission and VHT Multi-channel transmission may be included in: (1) the beacon, probe response, association response, and reassociation response frames sent by the AP or an WTRU in an Independent BSS (2) a VHT Operation IE included in frames sent by an AP or an WTRU in an Independent BSS (3) Channel Switch Announcement (Action) frame sent by the AP or an WTRU in an Independent BSS (4) a VHT Capabilities IE included in frames sent by an AP or an WTRU. VHT WTRU channel The VHT BSS may support widths that may be transmission in more than one used to transmit to bandwidth for example 20/40/80 MHz. WTRUs RIFS mode support in Reduced inter frame space (RIFS) VHT communication mode may be supported in the VHT BSS to increase medium usage efficiency. Protection In VHT WLANs there need to be requirements protection requirements for VHT indication for transmissions to account for various transmission of scenarios such as: (1) various VHT packets bandwidths of operation (2) devices of different capabilities etc. Non-Greenfield VHT When VHT WTRUs that are not VHT- WTRUs present Greenfield capable are present then indication appropriate protection mechanisms should be used for VHT transmissions that use the VHT-Greenfield format. Overlapping BSS When OBSS Non-VHT WTRUs are (OBSS) Non-VHT present then VHT-Greenfield WTRUs present transmissions should not be allowed in indication the BSS. Multiple Beacon Multiple beacons may be transmitted transmission in a VHT BSS for example VHT space- indication time block code (STBC) beacon in addition to the regular beacon. Multiple Multiple CTS protection may be used clear-to-send (CTS) to set network allocation vector (NAV) protection usage hen there exist VHT devices with indication different physical layer technologies, (e.g., STBC and non- STBC), that need protection for their packets. VHT STBC Beacon Indication whether the beacon indication containing this field is a VHT STBC beacon or not. Legacy Protection Indicates whether all the VHT WTRUs Full Support in the BSS support legacy signal in the VHT BSS protection mechanisms (e.g., L-SIG transmission opportunity (TXOP)). VHT phased Indicates whether VHT PCO (where coexistence the VHT AP divides time between operation 20/40/80 MHz bandwidth operation) is (PCO) active active in the BSS. VHT PCO Phase Indicates which VHT PCO phase is in operation (e.g., 20/40/80 MHz phase). Basic MCS Set Basic modulation and coding scheme for VHT (MCS) set is the set of MCS values that are supported by all VHT WTRUs in the BSS. Power Control Indicates that the power control for VHT in use mechanisms for VHT are in use in the BSS. Indication of OFDMA may be employed in VHT orthogonal WLAN by making channel/sub-carrier frequency division assignments for traffic/users. multiple access (OFDMA) in use Indication of Frequency reuse mechanisms may be frequency reuse employed to coexist with neighboring mechanisms VHT APs/OBSSs An example is increasing spectrum efficiency by reusing some frequencies from the frequency spectrum more often for WTRUs closer to the AP. This may alleviate the spectrum scarcity problem in densely deployed VHT APs, (i.e., interfering neighboring/overlapping BSSs). Indication of VHT WLANs will have to adopt OBSS management Overlapping BSS coping mechanisms to deal with the excessive channel reuse and interference in scenarios with densely deployed VHT APs. Indication of VHT WLANs will need APs/WTRUs to coexistence support parameters, rules, policies, mechanisms mechanisms and regulatory information for coexistence (e.g., inter-BSS, inter-system or television white space (TVWS)).
TABLE-US-00002 TABLE 2 Secondary channel configurations. Value Description 0 Indicates that no secondary channel is present (just 20 MHz). 1 Indicates that the secondary channel is above the primary channel (for 40 MHz). 2 Not used. 3 Indicates that the secondary channel is below the primary channel (for 40 Hz). Any unused Indicates 3 secondary channels immediately above value from the primary channel (80 MHz bandwidth formed by 0 to 256 4 contiguous 20 MHz channels). (flexible) Any unused Indicates 3 secondary channels immediately below value from the primary channel (80 MHz bandwidth formed by 0 to 256 4 contiguous 20 MHz channels). (flexible) Any unused Indicates 2 secondary channels immediately above value from the primary channel and 1 secondary channel 0 to 256 immediately below the primary channel (80 MHz (flexible) bandwidth formed by 4 contiguous 20 MHz channels). Any unused Indicates 1 secondary channel immediately above value from the primary channel and 2 secondary channels 0 to 256 immediately below the primary channel (80 MHz (flexible) bandwidth formed by 4 contiguous 20 MHz channels). Any unused Indicates configuration of positions of each of value from the 3 secondary channels relative to the primary 0 to 256 channel where the 80 MHz bandwidth is not formed (flexible) by 4 contiguous 20 MHz channels. Many such configurations are possible and each may have a value associated with it. Any unused Indicates configuration of the position of the value from secondary channel relative to the primary channel 0 to 256 where a 40 MHz bandwidth is not formed by 2 (flexible) contiguous 20 MHz channels. Many such configurations are possible and each may have a value associated with it. Any unused Indicates configuration of secondary channels for value from VHT Multi-channel transmission relative to the 0 to 256 primary channel. Many such configurations are (flexible) possible and each may have a value associated with it. Remaining Not used. up to 255
FIG. 8 is a diagram of an example of VHT capabilities information exchange between a VHT AP or WTRU1 602 and a VHT WTRU2 600. The VHT WTRU2 600 sends an action request frame 604 containing VHT capabilities information to the VHT AP or WTRU1 602. The VHT AP or WTRU1 602 returns an ack frame 606, or optionally not in response to a broadcast or "action no ack" message. The VHT AP or WTRU1 602 responds with a management frame/action response frame 608 containing VHT capabilities information to the VHT WTRU2 600. The VHT WTRU2 600 may return an ack message 610 unless the message was a broadcast or action no ack message.
In one embodiment, the VHT capabilities information may be formatted as a VHT Capabilities IE. FIG. 9 shows the structure of an example VHT Capabilities IE. The Element ID 665 of the VHT Capabilities IE may have a newly defined value specifically for the VHT Capabilities IE. The Length field 670 may contain the length of the VHT Capabilities IE following the Element ID field 665. The fields 675 in the VHT Capabilities IE, following the Element ID 665 and Length fields 670 may contain some or all of the VHT capabilities information described below. For example, in FIG. 9 there are "n" such fields. Note that any specific mapping of these fields to the VHT capabilities information may be chosen and several mappings may be possible.
TABLE-US-00003 TABLE 3 VHT Capabilities Information items Description Coding capabilities Higher rate coding, coding algorithms for VHT WLAN may be employed for VHT WLAN to enhance performance such as throughput and robustness. Supported channel The VHT WLAN may support various width set for VHT channel widths for eg. 20/40/80 MHz. WLAN Transmission Multiple channels may be used capabilities for simultaneously for communication, for non-contiguous example, two 40 MHz channels that are channels for not contiguous. An example of the communication possible secondary channel configurations and corresponding values (note that the exact numerical value may be chosen flexibly from the currently unused values within the range from 0 to 255) for the Secondary Channel Offset field corresponding to the VHT 80 MHz bandwidth transmission, VHT 40 MHz bandwidth transmission and VHT Multi-channel transmission is shown in Table 2 above. In one embodiment, the modified Secondary Channel Offset field which includes values for secondary channel configurations supporting VHT 80 MHz bandwidth transmission, VHT 40 MHz bandwidth transmission and VHT Multi-channel transmission may be included in: (1) the beacon, probe response, association response, and reassociation response frames sent by the AP or an WTRU in an Independent BSS (2) a VHT Operation IE included in frames sent by an AP or an WTRU in an Independent BSS (3) Channel Switch Announcement (Action) frame sent by the AP or an WTRU in an Independent BSS (4) a VHT Capabilities IE included in frames sent by an AP or an WTRU. Reception Multiple channels may be used capabilities for simultaneously for communication, for non-contiguous example, two 40 MHz channels that are channels for not contiguous. See also, notes above communication regarding Transmission capabilities for non-contiguous channels for communication. Transmission The multiple channels that are non- capabilities for contiguous used for transmission asynchronous simultaneously with data flow on the communication over channels being asynchronous. non-contiguous channels Reception The multiple channels that are non- capabilities for contiguous may be used for transmission asynchronous simultaneously with data flow on the communication over channels being asynchronous. non-contiguous channels Power Saving With various types of devices and capabilities for applications on VHT WLANs there may VHT WLAN be a need for suitable power saving mechanisms. VHT Greenfield During Greenfield operation (i.e. no capabilities legacy devices and only VHT devices indicating being present) the packets may be support for allowed to be transmitted in a reception of Greenfield format (i.e. with efficient packets with preambles designed for VHT packets). VHT Greenfield format Short GI support The VHT WLAN may support 80 MHz for reception of bandwidth transmissions with a short packets Guard Interval in the Physical Layer. transmitted with a 80 MHz bandwidth Transmit VHT WLAN may use Space Time Block Capabilities for Coding (STBC) mechanisms to increase VHT STBC throughput. packets Receive VHT WLAN may use STBC mechanisms Capabilities to increase throughput. for VHT STBC packets Block Ack For VHT WLANs Block Capabilities for Acknowledgement (Note: A Block Ack VHT WLAN acknowledges the reception of a Block of packets) mechanisms may be needed for multi-user aggregation in the uplink; multi-user aggregation in the downlink; multi-user MIMO in the uplink; multi- user MIMO in the downlink. Maximum VHT WLANs may need to support multi-user multi-user packet aggregation aggregation mechanism to increase data throughput. packet length Indication of VH WLANs the BSS may allow (or not use of allow) direct sequence spread spectrum DSSS/CCK mode in (DSSS) and complementary code keying a 80 MHz BSS (CCK) modes of operation in 80 MHz operation BSS operation. An WTRU may (or may not) use DSSS/CCK modes of operation in 80 MHz. 80 MHz Intolerant A VHT WTRU may indicate this to indication prevent the receiving VHT AP from operating the BSS in 80 MHz mode. 40 MHz Intolerant A VHT WTRU may indicate this to indication prevent the receiving VHT AP from operating the BSS in 40 MHz mode. 20/80 MHz A VHT WTRU may indicate this to Intolerant prevent the receiving VHT AP from indication operating the BSS in 20/80 MHz mode. 20/40 MHz A VHT WTRU may indicate this to Intolerant prevent the receiving VHT AP from indication operating the BSS in 20/40 MHz mode. 20/40/80 MHz A VHT WTRU may indicate this to Intolerant prevent the receiving VHT AP from indication operating the BSS in 20/40/80 MHz mode. 40/80 MHz A VHT WTRU may indicate this to Intolerant prevent the receiving VHT AP from indication operating the BSS in 40/80 MHz mode. Legacy Protection Legacy devices (i.e. based on 802.11 support in VHT standard prior to VHT WLAN) operation WLAN may be supported using legacy signal protection mechanisms. Packet Aggregation VHT devices may have different parameters for capabilities to receive VHT packet VHT WLAN aggregation such as: (1) maximum length of a multiuser packet aggregation and/or (2) minimum time separation between aggregated packets for proper reception. Supported MCS set Higher MCSs (Modulation and Coding for VHT WLAN Schemes) may be used in VHT WLANs than in legacy systems for higher throughput. Capabilities to MCSes may be used in VHT WLANs provide VHT MCS which may require corresponding Feedback for VHT feedback from receiver to transmitter. WLAN Support for VHT VHT WLAN BSS may adopt a VHT Phased Phased Coexistence Operation where coexistence of the VHT AP may divide time between 20/40/80 MHz and 20/40/80 MHz bandwidth operation. combinations of Note that all possible combinations may these bandwidths be considered, for example, 20/40/80 GHz, 40/80 GHz, 20/80 MHz, 20/40 MHz. The AP may switch the BSS operation amongst the chosen bandwidths (i.e., 20/40/80 MHz phases) for phased coexistence operation. VHT PCO Transition Time duration for switching between Time communication bandwidths, for example, from 40 MHz to 80 MHz in PCO operation. VHT Control field May indicate support of the Very High support Throughput Control field which may be used for sending VHT Control information and may be included in data/control/management frames. VHT Reverse The existing Reverse Direction protocol Direction protocol (for an initiator device to grant a part Responder of its transmit opportunity to a capabilities responder device) may be extended for VHT operation, for example, in a Multi-user MIMO scenario. For example in Downlink (AP to WTRU) MU-MIMO where AP communicates with several WTRUs at the same time, the AP may grant Reverse Direction transmission time to one or more of the WTRUs following the AP transmission. This grant of transmission time by the AP will be within the transmit opportunity (TXOP) duration that it has under its control. VHT Transmit Transmit beamforming features for Beamforming VHT WLAN may be needed for example Capabilities/ in Multi-user MIMO operation. parameters VHT Antenna Antenna Selection features for VHT Selection WLAN may be needed for example in Capabilities/ Multi-user transmit/receive operation. parameters Power Control Power control may be needed in VHT for VHT WLAN WLAN in many scenarios such as: (1) capabilities/ Overlapping Basic Service Set (OBSS) parameters interference reduction (2) Uplink Multiuser MIMO. Since the WTRUs will transmit simultaneously on the Uplink MU-MIMO it will benefit the receiver if the received power levels at the AP are not too disparate so that all of the WTRUs may be received with adequate quality. In order to achieve this the transmit power levels of the WTRUs may have to be adjusted based on their location and channel conditions. Downlink Downlink Multi-user MIMO may be Multi-user needed in VHT WLAN to increase MIMO downlink throughput. capabilities/ parameters Uplink Uplink Multi-user MIMO may be needed Multi-user in VHT WLAN to increase uplink MIMO throughput. capabilities/ parameters Capabilities for The AP may process received ranging Ranging signaling signaling from a WTRU to recommend to for power the WTRU a transmit power control adjustment, for example, in an uplink Multiuser MIMO scenario. Capabilities for The AP may process received ranging Ranging signaling signaling from a WTRU to recommend to for the WTRU a transmit timing offset synchronization adjustment, for example, in an uplink Multiuser MIMO scenario. Since the WTRUs will transmit simultaneously on the Uplink MU-MIMO it will benefit the receiver if the received signals at the AP are synchronized so that all of the WTRUs may be received with adequate quality. In order to achieve this the transmit times of the WTRUs may have to be adjusted based on their location and channel conditions. Capabilities for OFDMA may be employed in VHT OFDMA in VHT WLAN by performing channel/sub- WLAN carrier assignments for traffic/users. Capabilities for Frequency reuse mechanisms may be frequency reuse employed to coexist with neighboring mechanisms VHT APs/OBSSs An example may be increasing spectrum efficiency by reusing some frequencies from the frequency spectrum more often for WTRUs closer to the AP. This may alleviate the spectrum scarcity problem in densely deployed VHT APs (i.e., interfering Neighboring/Overlapping BSSs). Capabilities for Due to interference from Overlapping Dynamic Frequency BSS or neighboring BSS VHT APs and
Selection VHT WTRUs may select frequencies for operation in a dynamic way. Capabilities for VHT APs and VHT WTRUs may switch VHT Channel channels. Switching Capabilities for VHT APs and VHT WTRUs may switch VHT Channel channels and bandwidths which may be Switching and 20/40/80 MHz wide. Bandwidth switching Capabilities for Link Adaptation mechanisms may be VHT Link supported for VHT WLANs in scenarios Adaptation such as: (1)Multi-channel transmission (2) Multiuser MIMO. Capabilities for VHT Channel State Information (CSI) VHT Channel State feedback mechanisms may be supported Information (CSI) for VHT WLANs in scenarios such as: feedback (1)Multi-channel transmission (2) Multiuser MIMO. Capabilities for VHT Channel sounding mechanisms VHT Channel may be supported for VHT WLANs in sounding scenarios such as: (1)Multi-channel transmission (2) Multiuser MIMO. Capabilities for VHT WLANs may adopt Overlapping OBSS management BSS coping mechanisms to deal with the excessive channel reuse and interference in scenarios with densely deployed VHT APs. Capabilities for VHT WLANs may need an AP/WTRU to VHT Frequency be able to receive VHT frequency reuse reuse information of neighboring BSSs and mechanisms transmit VHT frequency reuse information of its BSS. Capabilities for VHT WLANs may need WTRUs/APs to VHT Channel be able to scan the channels in the Scanning spectrum to make measurements according to specified VHT information/parameters for channels and channel bandwidths. Capabilities for VHT WLANs may need APs/WTRUs to Coexistence support parameters, rules, policies, mechanisms and regulatory information for coexistence (for example, inter-BSS, inter-system or Television White Space(TVWS)). Some of the mechanism may include sharing of information amongst BSSs on channel usage.
Previous Patent US 9,854,497 | Next Patent US 9,854,499