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1. WO2007103291 - PROCÉDÉ ET SYSTÈME DE TRANSITION AMÉLIORÉE D'UN ENSEMBLE DE SERVICES DE BASE POUR UN RÉSEAU LOCAL SANS FIL À HAUT DÉBIT

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[0001] METHOD AND SYSTEM FOR ENHANCED BASIC SERVICE
SET TRANSITION FOR A HIGH THROUGHPUT WIRELESS LOCAL AREA NETWORK

[0002] FIELD OF INVENTION
[0003] The present invention is related to a wireless local area network

(WLAN). More particularly, the present invention is related to a method and system for enhanced basic service set (BSS) transition for high-throughput WLAN systems.

[0004] BACKGROUND
[0005] The IEEE 802. Hr amendment to the IEEE 802.11 WLAN standards describes fast basic service set (BSS) transition. The goal of the IEEE 802. Hr amendment is to minimize the amount of time that data connectivity between a station (STA) and a distribution system (DS) is lost during a BSS transition. According to the IEEE 802. Hr amendment, a STA may establish security and a quality of service (QoS) state at a new AP with minimal connectivity loss to the DS.
[0006] IEEE 802. Hr defines three stages for a BSS transition from a current AP to a new AP. In a discovery stage, a STA locates and determines to which AP it will attempt a transition. IEEE 802. Hr BSS transition services provide a mechanism for the STA to communicate and retrieve information on target AP candidates prior to making a transition. In a resource establishment stage, the STA may determine that the target AP will provide connection resources that the STA needs to maintain active sessions. IEEE 802.Hr fast BSS transition services provide a mechanism for the STA to reserve resources at a target AP, prior to making a transition or at the time of re-association with the target AP. In a transition stage, the STA abandons the current AP and establishes a connection with the new AP. IEEE 802.Hr fast BSS transition services provide a mechanism for the STA to re-associate with, the target AP while minimizing any latency introduced from protocol overhead.
[0007] The STA may communicate with the target AP directly using IEEE

802.11 authentication frames, (i.e., "over-the-air"), or via a currently associated

AP5 (i.e., "over-the-DS"). In an over-the-DS case, the communication between the

STA and the target AP is carried in fast transition action frames between the

STA and the current AP and using an encapsulation method between the current

AP and the target AP.
[0008] IEEE 802. Hn has been proposed to improve throughput in a

WLAN. Unlike IEEE 802.11a/b/g standards, many optional features, capabilities and parameters in medium access control (MAC) and physical layers are defined in IEEE 802. Hn. This gives rise to a potentially problematic situation where one

AP, (e.g., a current AP), supports a certain set of capabilities, features and/or parameters, while another AP, (e.g., a target AP), supports a different set of capabilities, features and/or parameters which are not identical with the current

AP's.
[0009] Situations like this may arise not only when equipment from different vendors is deployed in a network, but may also arise when different configurations are applied to APs to serve different traffic needs. This may cause problems related to performance, QoS, or the like, when the STA initiates a BSS transition because the STA does not know which capabilities, features and parameters are supported by the target AP for the ongoing session.
[0010] For example, when an IEEE 802.1 In-enabled STA is served by an

AP in a 40 MHz channel and if the target AP only supports a 20 MHz channel, there is a high potential that the STA may not experience the same throughput after a BSS transition. In the current state-of-the-art, a STA does not have knowledge of high-throughput-related capabilities, features and parameters implemented or currently used in a neighbor AP.
[0011] In another example, a high-throughput STA implementing specialized power-saving features while delivering a voice over Internet protocol

(VoIP) service may want to re-select an IEEE 802. Hn AP that supports the same capabilities. However, with the current state-of-the-art, the STA does not know if the target AP employs these IEEE 802. Hn power-saving features. This may result in increased STA power consumption or frequent re-selections of APs until the STA finds a suitable IEEE 802.11n AP.

[0012] SUMMARY
[0013] The present invention is related to a method and system for enhanced BSS transition for high-throughput WLAN systems. The WLAN includes at least one high throughput-enabled AP, at least one additional AP, (high throughput-enabled or non-high throughput-enabled AP), and at least one high throughput-enabled STA. A STA and a target AP communicate high throughput-related information, such as IEEE 802. Hn capabilities or features, and the STA performs a BSS transition to the target AP based on the communicated high throughput-related information. The high throughput-related information may be communicated directly between the STA and the target AP or via a current AP. The high throughput-related information may be included in an IEEE 802.11r, 802,11k, or 802. Hv signaling message, or the like. The STA may generate and send measurement reports for an extended range and a normal range of an AP separately, or may generate and send a combined measurement report for an extended range and a normal range of an AP. A network management entity may obtain current status information of the STA and the AP regarding high throughput capabilities, features and parameters and selectively enable and disable at least one of the high throughput capabilities, features and parameters of the STA and the AP (current or target).

[0014] BRIEF DESCRIPTION OF THE DRAWINGS
[0015] A more detailed understanding of the invention may be had from the following description of a preferred embodiment, given by way of example and to be understood in conjunction with the accompanying drawings wherein:
[0016] Figure 1 shows a wireless communication system operating in accordance with the present invention; and [0017] Figure 2 is a flow diagram of a process for enhanced BSS transition in accordance with the present invention.

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0019] When referred to hereafter, the terminology "STA" includes but is not limited to a user equipment, a wireless transmit/receive unit (WTRU), a fixed or mobile subscriber unit, a pager, or any other type of device capable of operating in a wireless environment. When referred to hereafter, the terminology "AP" includes but is not limited to a Node-B, a base station, a site controller or any other type of interfacing device in a wireless environment.
[0020] Figure 1 shows a wireless communication system 100 operating in accordance with the present invention. The system 100 includes a STA 110 and a plurality of APs 120a, 120b. The STA 110 is a high throughput-enabled STA, (such as an IEEE 802.1 In-enabled STA), and at least one AP, (e.g., AP 120b), is a high throughput-enabled AP3 (such as an IEEE 802.11n-enabled AP). Each AP 120a, 120b serves a BSS 130a, 130b, respectively. The APs 120a, 120b are connected to a DS 140, which may form an extended service set (ESS). The APs 120a, 120b may belong to different ESSs. The STA 110 is currently associated with an AP 120a and needs to perform a BSS transition to an AP 120b, (i.e., a target AP). In accordance with the present invention, high throughput, (e.g., IEEE 802.1In), capabilities, features and parameters may be exchanged, enabled, disabled or modified either at start-up or during system operation.
[0021] Figure 2 is a flow diagram of a process 200 for enhanced BSS transition in accordance with the present invention. The STA 110 and the target AP 120b communicate high throughput-related information, (i.e., high throughput-related capabilities, features, parameters, and the like), before BSS transition (step 202). The STA 110 performs a BSS transition to the target AP 120b based on the communicated high throughput-related information (step 204). The high throughput-related information may be communicated either directly between the STA 110 and the target AP 120b, (i.e., "over-the-air"), or through the AP, (e.g., the AP 120a), with which the STA 110 is currently associated, (i.e., "over-the-DS"). In accordance with the present invention, the STA 110 and the target AP 120b are aware of the high throughput-related information of the STA 110 and the target AP 120b prior to the BSS transition and may avoid the potential problems due to uncertainty with respect to the high throughput capability and features.
[0022] The high throughput-related information may be included in an existing signaling message including a signaling message based on IEEE 802. Hr, 802.11V and 802.11k standards. For carrying the high throughput-related information, at least one information element (IE) may be added to the existing signaling messages. Alternatively, the currently defined IE may be enhanced or expanded to provide the high throughput-related information. It should be noted that the terminology "IE" is used as a generic description and may be extended to any ioforniation-carryiαg signaling messages or information-carrying data elements in any frame type or element.
[00231 The high throughput-related information may be included in a management frame, a control frame, an action frame, a data frame, or any type of frame. The high throughput-related information may be included in a beacon frame, a probe request frame, a probe response frame, a secondary or auxiliary beacon frame, (e.g., a beacon frame used to support an extended range feature), an association request frame, an association response frame, a re-association request frame, a re-association response frame, an authentication request frame, an authentication response frame, or within any frame.
[0024] The high throughput-related information may be included in an

IEEE 802. Hr signaling messages, such as a fast transition (FT) action request frame and an FT action response frame. The high throughput-related information may be included in an IEEE 802. Hk signaling messages, such as a measurement pilot frame, an AP channel request element, an AP channel report element, a neighbor report request frame or element, a neighbor report response frame or element. The high throughput-related information may be included in an IEEE 802. Hv signaling message, such as a roaming management request frame or element, and a roaming management response frame or element.

[0025] The high throughput-related information, (e.g., IEEE 802.1In-related information), that may be communicated between a STA and an AP, among STAs or among APs is listed in Table 1. It should be noted that the list in Table 1 is provided as an example and any other relevant information may be further included. At least one of the information listed in Table 1 may be communicated for a BSS transition for high-throughput STAs.



Table 1 [0026] In addition to the information in Table 1, at least one of the following information may also be communicated for fast BSS transition services for high-throughput STAs:
1) Availability of IEEE 802.Hn services;
2) Availability of BA resources, and the pre-setup of BA agreements;
3) Setup of A-MPDU aggregation parameters, such as an MPDU density parameter;
4) Availability of PSMP service;
5) Availability of automatic power save delivery (APSD) service and parameters;
6) Availability of extended range service; and
7) Availability of certain data rates (i.e., modulation and coding scheme (MCS)), such as space time block coding (STBC)-based MCS.
[0027] Extended range feature has been designed to improve the range of the WLAN and remove dead spots. When the extended range feature is implemented, some STAs may utilize extended range MCS, (e.g., space time block coding (STBC)), and the effective range of the AP is extended, while other STAs may utilize normal range and normal MCS. The BSS range may be viewed as comprising two areas, one for extended range and the other for normal range. The extended range area encompasses the normal range area.
[0028] For the extended range features, STAs and APs may exchange a neighbor report frame, a measurement pilot frame, a measurement request/response frame (or element), a link measurement request/response frame (or element), or the like. The neighbor report frame is transmitted to report neighboring APs including neighboring AP information. The measurement pilot frame contains information regarding measurements. The measurement request frame (or element) contains a request that the receiving STA undertake the specified measurement action. The link measurement request frame is transmitted by a STA to request another STA to respond with a link measurement report frame to enable measurement of link path loss and estimation of link margin.

[0029] In accordance with the present invention, in performing and reporting measurements per neighbor cell, the STAs may generate two separate and independent measurement reports, one for the extended range and the other for the normal range. Alternatively, the STAs may generate a single combined measurement report for both the extended range and the normal range.
[0030] The high throughput capabilities, features and parameters may be selectively enabled or disabled by a network management entity. A remote or local network management entity communicates with individual APs, a group of APs, individual STAs or groups of STAs via a layer 2 communication protocol or a layer 3 or higher layer communication protocol to selectively retrieve a current status of employed capabilities, features and parameters of the APs and STAs. The retrieval of the current status information may be performed through a poll, (i.e., request and report mechanism), a periodical reporting, or in an un-solicited manner. After collecting the status information, the network management entity may selectively enable or disenable one or more of the high throughput capabilities, features and parameters stated hereinabove including the list in Table 1.
[0031] A simple network management protocol (SNMP) may be used as a signaling protocol. Alternatively, the signaling protocol may use SNMP-like messages. The SNMP messages are encapsulated into L2 frames by an AP for transmission between a STA and the AP, and translated back and forth into SNMP messages in the AP for transmission between the AP and the network management entity. In another alternative, the signaling protocol may be carried inside IP units.
[0032] In order to collect the status information of high throughput capabilities, features and parameters, the communication may be via databases implemented on the STA(s), AP(s), the network management entity or a combination of those. Preferably, the database is in the form, of a management information base (MIB).
[0033] The network management functionality may reside in one or more

APs, and APs may exchange information pertaining to high throughput capabilities, features and parameters relevant to APs and/or STAs amongst themselves.
[0034] Embodiments.
[0035] 1. A method for enhanced BSS transition from a current AP to a target AP in a wireless communication system including at least one high throughput-enabled AP and at least one high throughput-enabled STA.
[0036] 2. The method of embodiment 1 comprising a high throughput-enabled STA and a target high throughput-enabled AP communicating high throughput-related information.
[0037] 3. The method of embodiment 2 comprising the high throughput-enabled STA performing a BSS transition to the target high throughput-enabled AP based on the communicated high throughput-related information.
[0038] 4. The method as in any one of embodiments 2-3, wherein the high throughput-related information is communicated directly between the high throughput-enabled STA and the target high throughput-enabled AP.
[0039] 5. The method as in any one of embodiments 2-3, wherein the high throughput-related information is communicated via a current AP.
[0040] 6. The method as in any one of embodiments 2-5, wherein the high throughput-related information is included in at least one of a beacon frame, a secondary beacon frame, a probe request frame, a probe response frame, an association request frame, an association response frame, a re-association request frame, a re-association response frame, an authentication request frame and an authentication response frame.
[0041] 7. The method as in any one of embodiments 2-6, wherein the high throughput-related information is included in at least one of a data frame, a management frame, a control frame and an action frame.
[0042] 8. The method as in any one of embodiments 2-7, wherein the high throughput-related information is included in an IEEE 802. Hr related signaling message.

[0043] 9. The method as in any one of embodiments 2-7, wherein the high throughput-related information is included in an IEEE 802.11k related signaling message.
[0044] 10. The method of embodiment 9, wherein the high throughput-related information is included in at least one of a measurement pilot frame, an AP channel request element, an AP channel report element, a neighbor report request frame, a neighbor report response frame, a neighbor report request element, and a neighbor report response element.
[0045] 11. The method as in any one of embodiments 2-7, wherein the high throughput-related information is included in an IEEE 802. Hv related signaling message.
[0046] 12. The method of embodiment 11, wherein the high throughput-related information is included in at least one of a roaming management request frame, a roaming management request element, a roaming management response frame, and a roaming management response element.
[0047] 13. The method as in any one of embodiments 2-7, wherein the high throughput-related information is IEEE 802. Hn related information.
[0048] 14. The method of embodiment 13, wherein the high throughput-related information includes at least one of availability of IEEE 802.11n services, availability of block ACK resources and pre-setup of block ACK agreements, setup of A-MPDU aggregation parameters, availability of PSMP service, availability of APSD service and parameters, availability of extended range service, and availability of certain data rates.
[0049] 15. The method as in any one of embodiments 2-14, wherein the high throughput-related information includes at least one of capabilities, features, and parameters of the high throughput-enabled AP and the high throughput-enabled STA.
[0050] 16. The method as in any one of embodiments 2-15, wherein the high throughput-related information indicates a frame aggregation format that allows aggregation of multiple MPDUs in one PSDU.

[00511 17. The method as in any one of embodiments 2-16, wherein the high throughput-related information indicates a frame aggregation format that allows aggregation of multiple MSDUs in one MPDU.
[0052] 18. The method as in any one of embodiments 2-17, wherein the high throughput-related information indicates a Block acknowledgement mechanism.
[0053] 19. The method as in any one of embodiments 2-18, wherein the high throughput-related information indicates an N-Immediate block acknowledgement.
[0054] 20. The method as in any one of embodiments 2-19, wherein the high throughput-related information indicates an N-delayed BA including a no acknowledgement on a BA or a BAR.
[0055] 21. The method as in any one of embodiments 2-20, wherein the high throughput-related information indicates compressed bitmap block acknowledgement.
[0056] 22. The method as in any one of embodiments 2-21, wherein the high throughput-related information indicates implicit block acknowledgement request by asserting normal acknowledgement of a MPDU aggregated in a

PSDU.
[0057] 23. The method as in any one of embodiments 2-22, wherein the high throughput-related information indicates long NAV reservation with CF-end for NAV release.
[0058] 24. The method as in any one of embodiments 2-23, wherein the high throughput-related information indicates physical layer level spoofing.
[0059] 25. The method as in any one of embodiments 2-24, wherein the high throughput-related information indicates MIMO power save.
[0060] 26. The method as in any one of embodiments 2-25, wherein the high throughput-related information indicates reduce MIMO capability.
[0061] 27. The method as in any one of embodiments 2-26, wherein the high throughput-related information indicates mechanisms to manage coexistence of 20 and 40 MHz channels.

[0062] 28. The method as in any one of embodiments 2-27, wherein the high throughput-related information indicates channel management and channel selection methods.
[0063] 29. The method as in any one of embodiments 2-28, wherein the high throughput-related information indicates RIPS protection.
[0064] 30. The method as in any one of embodiments 2-29, wherein the high throughput-related information indicates green field protection.
[0065] 31. The method as in any one of embodiments 2-30, wherein the high throughput-related information indicates PSMP.
[0066] 32. The method as in any one of embodiments 2-31, wherein the high throughput-related information indicates multiple TID block acknowledgement.
[0067] 33. The method as in any one of embodiments 2-32, wherein the high throughput-related information indicates STBC control frames.
[0068] 34. The method as in any one of embodiments 2-33, wherein the high throughput-related information indicates L-SIG transmit opportunity protection.
[0069] 35. The method as in any one of embodiments 2-34, wherein the high throughput-related information indicates a PCO capability.
[0070] 36. The method as in any one of embodiments 2-35, wherein the high throughput-related information indicates transmit beamforming capability.

[0071] 37. The method as in any one of embodiments 2-36, wherein the high throughput-related information indicates fast link adaptation.
[0072] 38. The method as in any one of embodiments 2-37, wherein the high throughput-related information indicates implicit feedback.
[0073] 39. The method as in any one of embodiments 2-38, wherein the high throughput-related information indicates CSI feedback.
[0074] 40. The method as in any one of embodiments 2-39, wherein the high throughput-related information indicates use of a zero length frame as a sounding frame.

[0075] 41. The method as in any one of embodiments 2-40, wherein the high throughput-related information indicates calibration support.
[0076] 42. The method as in any one of embodiments 2-41, wherein the high throughput-related information indicates reverse direction support of responder's data transfer.
[0077] 43. The method as in any one of embodiments 2-42, wherein the high throughput-related information indicates antenna selection.
[0078] 44. The method as in any one of embodiments 2-43, wherein the high throughput-enabled STA generates and sends measurement reports for an extended range and a normal range of the high throughput-enabled AP independently.
[0079] 45. The method as in any one of embodiments 2-44, wherein the high throughput-enabled STA generates and sends a combined measurement report for an extended range and a normal range of the high throughput-enabled

AP.
[0080] 46. The method as in any one of embodiments 3-45, further comprising a network management entity obtaining current status information of the high throughput-enabled STA and the high throughput-enabled AP regarding high throughput capabilities, features and parameters.
[0081] 47. The method of embodiment 46 comprising the network management entity selectively enabling and disabling at least one of the high throughput capabilities, features and parameters of the high throughput-enabled

STA and the high throughput-enabled AP.
[0082] 48. The method as in any one of embodiments 46-47, wherein the network management entity is included in the high throughput-enabled AP.
[0083] 49. The method as in any one of embodiments 46-48, wherein the network management entity, the high throughput-enabled STA and the high throughput-enabled AP conxmunicate via a layer 2 communication protocol retrieve the current status information.
[0084] 50. The method as in any one of embodiments 46-48, wherein the network management entity, the high throughput-enabled STA and the high throughput-enabled AP communicate via a layer 3 coπmiunication protocol retrieve the current status information.
[0085] 51. The method as in any one of embodiments 46-50, wherein the current status information is retrieved through a poll.
[0086] 52. The method as in any one of embodiments 46-50, wherein the current status information is retrieved through a periodical reporting.
[0087] 53. The method as in any one of embodiments 46-50, wherein the current status information is retrieved in an un-solicited manner.
[0088] 54. The method as in any one of embodiments 46-48, wherein the network management entity, the high throughput-enabled STA and the high throughput-enabled AP communicate using a SNMP.
[0089] 55. The method as in any one of embodiments 46-48, wherein the network management entity, the high throughput-enabled STA and the high throughput-enabled AP communicate using SNMP-like messages, wherein SNMP messages are encapsulated into L2 frames by the high throughput-enabled AP for transmission between the high throughput-enabled STA and the high throughput-enabled AP and translated back and forth into SNMP messages in the high throughput-enabled AP for transmission between the high throughput-enabled AP and the network management entity.
[0090] 56. The method as in any one of embodiments 46-48, wherein the network management entity, the high throughput-enabled STA and the high throughput-enabled AP communicate using IP units.
[0091] 57. The method as hi any one of embodiments 46-56, wherein the status information is collected via databases implemented on at least one of the high throughput-enabled STA, the high throughput-enabled AP and the network management entity.
[0092] 58. The method of embodiment 57 wherein the database is in a form of an MIB.
[0093] 59. The method as in any one of embodiments 2-58, wherein the current AP and the target high throughput-enabled AP belong to the same ESS.

[0094] 60. The method as in any one of embodiments 2-58, wherein the current AP and the target high throughput-enabled AP belong to different ESSs.

[0095] 61. A wireless communication system for enhanced BSS transition from a current AP to a target AP.
[0096] 62. The system of embodiment 61 comprising at least one high throughput-enabled AP configured to communicate high throughput-related information.
[0097] 63. The system of embodiment 62 comprising at least one high throughput-enabled STA configured to communicate high throughput-related information and perform a BSS transition to the target AP based on the communicated high throughput-related information.
[0098] 64. The system as in any one of embodiments 62-63, wherein the high throughput-related information is communicated directly between the STA and the target AP.
[0099] 65. The system as in any one of embodiments 62-64, wherein the high throughput-related information is communicated between the STA and the target AP via the current AP.
[00100] 66. The system as in any one of embodiments 62-65, wherein the high throughput-related information is included in at least one of a beacon frame, a secondary beacon frame, a probe request frame, a probe response frame, an association request frame, an association response frame, a re-association request frame, a re-association response frame, an authentication request frame and an authentication response frame.
[00101] 67. The system as in any one of embodiments 62-66, wherein the high throughput-related information is included in at least one of a data frame, a management frame, a control frame and an action frame.
[00102] 68. The system as in any one of embodiments 62-67, wherein the high throughput-related information is included in an IEEE 802. Hr related signaling message.

[00103] 69. The system as in any one of embodiments 62-67, wherein the high throughput-related information is included in an IEEE 802.11k related signaling message.
[00104] 70. The system of embodiment 69, wherein the high throughput-related information is included in at least one of a measurement pilot frame, an AP channel request element, an AP channel report element, a neighbor report request frame, a neighbor report response frame, a neighbor report request element, and a neighbor report response element.
[00105] 71. The system as in any one of embodiments 62-67, wherein the high throughput-related information is included in an IEEE 802. Hv related signaling message.
[00106] 72. The system of embodiment 71 , wherein the high throughput-related information is included in at least one of a roaming management request frame, a roaming management request element, a roaming management response frame, and a roaming management response element.
[00107] 73. The system as in any one of embodiments 62-67, wherein the high throughput-related information is IEEE 802. Hn related information.
[00108] 74. The system of embodiment 73, wherein the high throughput-related information includes at least one of availability of IEEE 802. Hn services, availability of block ACK resources and pre-setup of block ACK agreements, setup of A-MPDU aggregation parameters, availability of PSMP service, availability of APSD service and parameters, availability of extended range service, and availability of certain data rates.
[00109] 75. The system as in any one of embodiments 62-74, wherein the high throughput-related information includes at least one of capabilities, features, and parameters of the AP and the STA.
[00110] 76. The system as in any one of embodiments 62-75, wherein the high throughput-related information indicates a frame aggregation format that allows aggregation of multiple MPDUs in one PSDU.

[00111] 77. The system as in any one of embodiments 62-76, wherein the high throughput-related information indicates a frame aggregation format that allows aggregation of multiple MSDUs in one MPDU.
[00112] 78. The system as in any one of embodiments 62-77, wherein the high throughput-related information indicates a block acknowledgement mechanism.
[00113] 79. The system as in any one of embodiments 62-78, wherein the high throughput-related information indicates an N-immediate block acknowledgement.
[00114] 80. The system as in any one of embodiments 62-79, wherein the high throughput-related information indicates an N-delayed BA including a no acknowledgement on a BA or a BAR.
[00115] 81. The system as in any one of embodiments 62-80, wherein the high throughput-related information indicates compressed bitmap block acknowledgement.
[00116] 82. The system as in any one of embodiments 62-81, wherein the high throughput-related information indicates implicit block acknowledgement request by asserting normal acknowledgement of a MPDU aggregated in a

PSDU.
[00117] 83. The'system as in any one of embodiments 62-82, wherein the high throughput-related information indicates long NAV reservation with CF-end for NAV release.
[00118] 84. The system as in any one of embodiments 62-83, wherein the high throughput-related information indicates physical layer level spoofing.
[00119] 85. The system as in any one of embodiments 62-84, wherein the high throughput-related information indicates MIMO power save.
[00120] 86. The system as in any one of embodiments 62-85, wherein the high throughput-related information indicates reduce MIMO capability.
[00121] 87. The system as in any one of embodiments 62-86, wherein the high throughput-related information indicates mechanisms to manage coexistence of 20 and 40 MHz channels.

[00122] 88. The system as in any one of embodiments 62-87, wherein the high throughput-related information indicates channel management and channel selection methods.
[00123] 89. The system as in any one of embodiments 62-88, wherein the high throughput-related information indicates RIFS protection.
[00124] 90. The system as in any one of embodiments 62-89, wherein the high throughput-related information indicates green field protection.
[00125] 91. The system as in any one of embodiments 62-90, wherein the high throughput-related information indicates PSMP.
[00126] 92. The system as in any one of embodiments 62-91, wherein the high throughput-related information indicates multiple TID block acknowledgement.
[00127] 93. The system as in any one of embodiments 62-92, wherein the high throughput-related information indicates STBC control frames.
[00128] 94. The system as in any one of embodiments 62-93, wherein the high throughput-related information indicates L-SIG transmit opportunity protection.
[00129] 95. The system as in any one of embodiments 62-94, wherein the high throughput-related information indicates a PCO capability.
[00130] 96. The system as in any one of embodiments 62-95, wherein the high throughput-related information indicates transmit beamforniing capability.

[00131] 97. The system as in any one of embodiments 62-96, wherein the high throughput-related information indicates fast link adaptation.
[00132] 98. The system as in any one of embodiments 62-97, wherein the high throughput-related information indicates implicit feedback.
[00133] 99. The system as in any one of embodiments 62-98, wherein the high throughput-related information indicates CSI feedback.
[00134] 100. The system as in any one of embodiments 62-99, wherein the high throughput-related information indicates use of a zero length frame as a sounding frame.

[00135] 101. The system as in any one of embodiments 62-100, wherein the high throughput-related information indicates calibration support.
[00136] 102. The system as in any one of embodiments 62-101, wherein the high throughput-related information indicates reverse direction support of responder's data transfer.
[00137] 103. The system as in any one of embodiments 62-102, wherein the high throughput-related information indicates antenna selection.
[00138] 104. The system as in any one of embodiments 62-103, wherein the

STA generates and sends measurement reports for an extended range and a normal range of an AP independently.
[00139] 105. The system as in any one of embodiments 62-104, wherein the

STA generates and sends a combined measurement report for an extended range and a normal range of an AP.
[00140] 106. The system as in any one of embodiments 63-105, further comprising a network management entity configured to obtain current status information of the STA and the AP regarding high throughput capabilities, features and parameters and selectively enable and disable at least one of the high throughput capabilities, features and parameters of the STA and the AP.

[00141] 107. The system of embodiment 106 wherein the network management entity is included in the AP.
[00142] 108. The system as in any one of embodiments 106-107, wherein the network management entity, the STA and the AP communicate via a layer 2 communication protocol retrieve the current status information.
[00143] 109. The system as in any one of embodiments 106-107, wherein the network management entity, the STA and the AP communicate via a layer 3 communication protocol retrieve the current status information.
[00144] 110. The system as in any one of embodiments 106-109, wherein the current status information is retrieved through a poll.
[00145] 111. The system as in any one of embodiments 106-109, wherein the current status information is retrieved through a periodical reporting.

[00146] 112. The system as in any one of embodiments 106-109, wherein the current status information is retrieved in an un-solicited manner.
[00147] 113. The system as in any one of embodiments 106-112, wherein the network management entity, the STA and the AP communicate using an

SNMP.
[00148] 114. The system as in any one of embodiments 106-112, wherein the network management entity, the STA and the AP communicate using SNMP-like messages, wherein SNMP messages are encapsulated into L2 frames by the

AP for transmission between the STA and the AP and translated back and forth into SNMP messages in the AP for transmission between the AP and the network management entity.
[00149] 115. The system as in any one of embodiments 106-112, wherein the network management entity, the STA and the AP communicate using IP units.
[00150] 116. The system as in any one of embodiments 106-112, wherein the status information is collected via databases implemented on at least one of the STA, the AP and the network management entity.
[00151] 117. The system of embodiment 116, wherein the database is in a form of an MIB.
[00152] 118. The system as in any one of embodiments 62-117, wherein the current AP and the target AP belong to the same ESS.
[00153] 119. The system as in any one of embodiments 62-117, wherein the current AP and the target AP belong to different ESSs.
[00154] Although the features and elements of the present invention are described in the preferred embodiments in particular combinations, each feature or element can be used alone without the other features and elements of the preferred embodiments or in various combinations with or without other features and elements of the present invention. The methods or flow charts provided in the present invention may be implemented in a computer program, software, or firmware tangibly embodied in a computer-readable storage medium for execution by a general purpose computer or a processor. Examples of computer- readable storage mediums include a read only memory (ROM), a random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
[00155] Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine.
[00156] A processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer. The WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) module.