TW201342849A - Method and system for improving responsiveness in exchanging frames in a wireless local area network - Google Patents

Abstract

A method and system for improving responsiveness in exchanging management and control frames in a wireless local area network are disclosed. An initiator sends a frame (action, management, control or data frame) to a responder. Upon correctly receiving the frame, the responder sends a response frame to the initiator instead of directly sending an acknowledgement (ACK) packet. The responder preferably accesses the wireless medium to send the response frame in a short inter-frame spacing (SIFS). With this scheme, a long delay associated with having to contend for the wireless medium to send the response frame is avoided and therefore, the responsiveness and timeliness of the feedback mechanism is significantly enhanced. The response frame may be piggybacked on or aggregated with another packet.

Description

Method and device for improving exchange frame reactivity in county-free regional network

The present invention relates to a wireless local area network (WLAN), and more particularly, to a method for improving exchange management, control, or data frame responsiveness in the WLAN. Method and system.

In an IEEE 802.11 WLAN, an access point (AP) or a station (STA) uses a management frame to guide certain management functions. Examples of such management frames are connection requests ( Association Request), Association Response, Reassociation Request, Reassociation Response, Probe Request, and Probe Response.

IEEE 802.11e uses the new management frame to extend the IEEE 802.11 standard. Some of these new management frames are called action frames, and these action frames are used to guide Certain functions, such as quality of service (QoS) traffic flow establishment, direct link establishment, block acknowledgment (ACK) establishment, or the like, examples of such action frames include: increasing traffic flow requests ( Add Traffic Stream (ADDTS) Request), ADDTS Response, Direct Link Setup Request (DLS), DLS Response, Add Block Confirmation (ADDBA) Request, Add Block ACK Response, Delete Block Confirmation (DELBA) Request, or Similar By.

Currently, IEEE 802.11n extensions have been proposed for achieving higher throughput (HT). In the proposal of IEEE 802.11n, a new motion frame is introduced for providing a transmission mode and channel information feedback, wherein the transmission mode feedback system enables a receiving station to notify that it is better for the current channel condition. Mode of a transmission station The station, and the selection of the special mode is determined by the receiving station. However, the transmitting station may or may not use the special mode, everything depends on its capabilities, and a receiving station is also available. Rejecting a preferred mode, in addition, the channel information feedback mechanism provides a mechanism for a transmitting station to learn the precise channel seen at the receiving station, and this information can be used as part of a calibration. In turn, it is used in systems that use channel reciprocity, or is used directly as channel feedback. As for a receiving station, it may provide a complete channel evaluation or a null response. Examples of such IEEE 802.11n action frames include Mode Request, Mode Response, multiple-input multiple-output (MIMO) Channel Request, and MIMO channel response. (MIMO Channel Response) and other frames.

Management frames (including action frames) can be broadcast, or multicast to multiple responders (for example, via a beacon frame), or, alternatively, can be unicast (unicast) ) to a special (single) responder (eg, ADDBA request, ADDBA response, mode request, mode response, MIMO channel request, and MIMO channel response), where a management, or action frame is unicast to A special responder, the IEEE 802.11 standard would require the responder to acknowledge receipt of such a frame by sending an ACK packet, and if the management or action frame is broadcast, or more When the broadcast is a plurality of responders, the IEEE 802.11 standard does not require such responders to acknowledge receipt of such a frame.

1 is a signal transmission diagram of a conventional program 100 for managing, or manipulating, frame exchanges between a starter 102 and a responder 104. The initiator 102 accesses a wireless medium that requires some delay in contention or access delay under the IEEE 802.11 standard, and sends an action frame (eg, one) The mode request frame is sent to the responder 104 (step 112), and after the action frame is correctly received, the responder 104 will also need to access the delay (for example, corresponding to a short message frame). Short inter-frame spacing (SIFS) delay and send an ACK packet to the wireless medium of the initiator 102 (step 114), and then the responder 104 prepares a motion frame (eg, a mode) a response frame, including the data requested by the initiator 102, Then, the wireless medium that needs some delay due to contention or access delay is accessed again, and the action frame is sent to the initiator 102 (step 116). At this time, the delay may be substantially long. Since it is possible that other stations also perform packet exchange at the same time, the responder 104 may not be able to access the medium as desired, and then, after receiving the action frame correctly from the responder 104, The initiator 102 will access the wireless medium which also requires some delay (typically, a time period corresponding to the SIFS) and sends an ACK packet to the responder 104 (step 118).

In the conventional program 100, since the responder 104 must first send an ACK packet (step 114), and then in order to access the wireless medium to transmit the response frame at step 116, a contention must be caused, or Take the delay, so the exchange of such management, or the action frame will be relatively slow, and such slow management, action frame response may reduce the performance of the WLAN, because the information may not be Valid, or at the time of its delivery, for example, due to transmission mode feedback, the responder 104 can specifically specify or indicate information related to the transmission of the initiator, including a data rate, a tone The modulation and coding scheme, the number of spatial streams in MIMO, and the guard interval. Therefore, such information should be exchanged as quickly as possible. Under the know-how of technology, the exchange of such information may be considerably delayed.

Therefore, there is a need for a mechanism for performing such management or exchange of action frames in a very short period of time.

The present invention relates to a method and system for improving the management of a WLAN and the exchange responsiveness of a control frame. An initiator sends a frame (action, management, control, or data frame) to a responder, and after receiving the frame correctly, the responder sends a response frame to the start Instead of directly transmitting an acknowledgment (ACK) packet, and preferably, the responder accesses the wireless medium to transmit the response frame within a short inter-frame interval (SIFS). With this solution, a long delay system that must compete for the wireless medium in order to transmit the response frame can be avoided, and therefore, the reactivity and timeliness of the feedback mechanism can be significantly enhanced, and wherein The response frame can be backed up Negative on another packet or aggregated with another packet.

ACK‧‧‧Confirm

A-PPDU‧‧‧ polymer layer agreement data unit

BAR‧‧‧ Block ACK request

CTS‧‧‧Clear Send

MAC‧‧‧Media Access Control

MFB‧‧‧MCS feedback

MIMO‧‧‧Multiple Input Multiple Output

MMPDU‧‧‧Manage MAC layer protocol data unit

MPDU‧‧‧MAC layer agreement data unit

MRQ‧‧‧MCS request

PPDU‧‧‧ physical layer agreement data unit

RTS‧‧‧ request to send

SIFS‧‧‧Short Interframe Space

Figure 1 is a diagram showing a conventional signal transmission pattern for management or motion frame exchange between an initiator and a responder; Figure 2 is a diagram showing the use of one of the present invention. A signal transmission pattern for management or motion frame exchange between the initiator and a responder; FIG. 3 and FIG. 4 are diagrams showing the operation between an initiator and a responder in accordance with the present invention. An exemplary procedure for packet switching is to designate an aggregated medium access control (MAC) layer protocol data unit (A-MPDU) with an ACK policy as management MAC layer protocol data. No-ACK of a management MAC layer protocol data unit (MMPDU); and FIG. 5 and FIG. 6 are diagrams showing an exemplary procedure for packet exchange between an initiator and a responder in accordance with the present invention, It is to specify an inter-frame spacing (RIFS) with an ACK policy as the No-ACK for the MMPDU.

Hereinafter, the proper nouns "initiator" and "responder" include, but are not limited to, a user equipment (UE), a wireless transmission/reception unit (wireless transmit/receive unit) Unit, WTRU), a mobile station, a fixed, or mobile subscriber unit, a pager, a Node B (B-B), a base station, a site controller, an access point, or any Other types of devices that can operate in a wireless environment.

Features of the invention may be incorporated into an integrated circuit (IC) or constructed in a circuit comprising a plurality of interconnecting members.

Figure 2 is a diagram of an action frame between a starter 202 (also known as an originator) and a responder 204 (also known as a recipient) in accordance with one aspect of the present invention. a signal transmission pattern of the exchanged program 200, wherein the initiator 202 is For the purpose of grasping a transmission opportunity (TXOP), and by a frame exchange sequence including aggregate physical layer protocol data units (A-PPDUs) or aggregation control frames And the communication entity transmitting the first frame, and the responder 204 is a communication entity that responds to the initiator 202 in a frame exchange sequence including the A-PPDU and the aggregation control frame. The initiator 202 sends an action frame (usually a request frame, such as a mode request frame) to a responder 204 (step 212), and after receiving the action frame correctly, instead of directly An ACK packet is sent, and the responder 204 sends a response action frame (e.g., a mode response frame) (step 214). After that, the present invention will be described with reference to the motion frame. However, it should be noted that the present invention is also applicable to any type of frame, for example, management frame, control message. A frame, a data frame, or the like, and the request frame and the response frame can be different types of frames.

Preferably, the responder 204 accesses the wireless medium to transmit the response action frame corresponding to a SIFS for a period of time, and then the initiator 202 sends an ACK after a short delay. The frame, preferably, corresponds to the SIFS (step 216). In accordance with the present invention, the long delay that must compete for the wireless medium when connected to step 116 in Figure 1 is avoided, and therefore the reactivity and timeliness of the feedback mechanism is significantly enhanced.

Alternatively, the response frame in step 214 may be piggybacked on an ACK packet, another management or control frame, or a data packet, or may be associated with the ACK packet. Another management or control frame, or a data packet is aggregated. When the ACK packet is piggybacked or aggregated, the ACK packet sent back due to the start action frame (ie, the mode request frame) will not be cancelled, but will be combined with another message. The box is sent together.

The signaling mechanism of the present invention can be implemented by a preset value or according to an established program shared by both the initiator 202 and the responder 204. In this case, an additional column The bit is included in a motion frame (including a management frame, a control frame, a data frame, or the like) to indicate a preferred signaling mechanism, for example, The initiator 202 can send a request frame (for example, a mode request frame, A MIMO channel request frame, an MCS request (MRQ) frame, a channel state information (CSI) request frame, a calibration star frame, and a transmission antenna selection vocal request A transmission antenna selection sounding request frame, or a training request (TRQ) frame, or the like, and is configured to indicate the responder 204 in the request frame. It is expected how to respond to the new field of the request frame.

The new fields include, but are not limited to, at least one of an ACK policy field, a request identification number field, a response time policy field, and an aggregation policy field, and wherein The ACK policy field indicates whether the responder 204 needs to send an ACK packet.

The request identification number field includes a request identification number, and a response frame uses a similar request identification number field, and the value corresponds to the request identification number in the request frame. Or, alternatively, if the response frame is sent as much as possible, the request identification number field in the response frame can be set to a special value, which will be After detailed explanation.

The response time delay policy field will indicate whether the responder 204 is expected to immediately send a response frame to the initiator 202 (i.e., SIFS), or to be longer than the short delay. Within a particular time delay range, or at a time point selected by the responder 204 (ie, an unsolicited).

The aggregation policy field indicates whether the responder 204 is expected to send a response frame that is piggybacked on another packet or aggregated with other packets, for example, an ACK packet, a management or control packet. , a data packet, or other types of packets, and multiple management frames can be aggregated in a packet. Here, when an MMPDU is transmitted independently (that is, not part of an aggregation), a simple ACK is used, and when one or more MMPDUs are transmitted as part of an aggregation, then A block ACK (BA) can be used.

When the ACK policy is selected to include an ACK that responds to the response frame, then the next solution can be implemented. The MMPDU utilizes a separate counter that is not unique to each responder and is assigned a sequential number by the initiator 202. (sequence numbers, SN), and will also be used for broadcast/multicast frames, as well as for non-QoS-data subtype frames. In accordance with the present invention, the management frame is sorted using a pair of unique individual SN counters, each of which is unique, or alternatively, the management frame can be sorted using the same SN counter. , just like the data that is aggregated with the management frame. Alternatively, the same IEEE 802.11e method for assigning the SN to the management frame will be used, and the responder 204 will not rearrange the management frames because of the received SNs. The interval is not used by the responder 204 to explicitly identify the lost frame. Therefore, the initiator 202 only needs to store the management frames by being included in the ACK policy field. Copies until they are confirmed or they expire.

In relation to a block ACK request (BAR) for managing a frame, the ACK policy field of the new MMPDU can be interpreted as a BAR. Alternatively, an additional MAC protocol data unit (MPDU) for managing the frame can be used as an aggregation (ie, the aggregation containing 2 BAR frames: one for The data frame, another part of the management frame, is sent, or, alternatively, the BAR MPDU format can be extended to include an additional portion for management of the frame (ie, The packet includes an aggregation of BAR frames for the management frame and the two portions of the data frame.

Regarding a BA packet, an individual BA MPDU for managing the frame can be used as an aggregation (that is, an aggregation of 2 BA packets: one for the data frame and the other for the management frame). A portion is sent, or alternatively, a conventional BA MPDU format can be extended to include an additional portion for confirming the management frame (ie, the containing one has a separate for the Management frame and aggregation of BA in two parts of the data frame).

Regarding the format of the BA and the BAR packet supporting the management frame, the BA and BAR packets used for the management frame may be the same or similar to the conventional frame format, and the system may utilize one. Bits, or special field assignments, are explicitly identified, and the BA and BAR are concepts that can be followed by a starting sequence number (SSN) using a one-bit map. Among them, if it is the BA When a bit position n of the bit map is set to 1, it will determine the reception of an MPDU having a sequence control value equal to BA SSN+n, and if it is the BA bit map When a meta-location is set to 0, it is an indication that an MPDU having an MPDU sequence control value equal to (BA SSN+n) has not been successfully received. Typically, the aggregation management frame is very There may be an increased SN. When there is a large gap between the aggregation management frames in the SN (for example, aggregated retransmitted frames and new frames), multiple BA systems can be used. Each aggregation confirms a different management frame, or a plurality of frames, for example, if the bitmap has a predefined maximum size (eg, 16 bits), and the aggregation management frames have If there are more than 15 different sequential numbers, they cannot be confirmed in the same bitmap, and another BA frame is necessary. The BA and BAR can be considered simply for each. The management frame lists the SN.

The MQR frame, the MCS feedback (MFB) frame, and the Training Request (TRQ) frame, including the new fields, are described herein as examples. However, it should be noted that any other management, control, or data frame may include these new frames to enhance the responsiveness of exchanging such packets.

The MRQ frames are a management frame of the category HT. The MRQ frame is used to request MCS feedback from a responder 204, and the MRQ frame, except for an MCS request field, as shown in Table 1, includes an ACK policy field. At least one of a request identification number field, a response time policy field, and an aggregate format field, wherein the ACK policy field is set to "Non-ACK" (also That is, a direct MFB frame response is required, or "ACK" (ie, an ACK packet is required). If the MFB packet is expected to be once, the request identification number field is set to a request. The identification number, or if the MFB packet is sent as much as possible, is set to "0", and the response time policy field is set to "immediately" (ie, SIFS), "delay", or Is "actively provided", if the response time is set to "immediately", the responder 204 is expected to immediately send an MFB frame (i.e., in the SIFS range), if the response time The responder 204 when the policy is set to "delay" MFB is expected to send the information frame within the stated time delay, if the response time when the policy line to be set to "active offer" is, the system can respond to 204 The response is sent at the time point selected by the responder 204, and the aggregate format field can be set to "aggregate MAC protocol data unit (A-MPDU)", "RIFS-PPDU", or "non-aggregate (No- Aggregation)", if the aggregate format field is set to "A-MPDU", the responder 204 and the initiator 202 are expected to send an A-MPDU, if the aggregate format field is When set to "RIFS-PPDU", the responder 204 and the initiator 202 are expected to use the RIFS to send multiple MPDUs, but may generate an A-MPDU, if the aggregate format field is set to In the case of "No-Aggregation", the responder 204 and the initiator 202 are expected to not aggregate the MFB frame. Alternatively, if the aggregate format field is not included in the MRQ frame or the MFB frame, then it is not required to be indicated by the aggregate format field and by other parties. In this case, the aggregation can be performed when the responder 204 or the initiator 202 determines independently.

The MFB frame is a management frame of the category HT. The MFB frame will respond to an MRQ frame or be sent independently, and the MFB frame, except for an MFB field, as shown in Table 2, will include an ACK policy field, one Requesting at least one of a number field, a response time policy field, and an aggregate format field, wherein the ACK policy field is set to "Non-ACK" or "ACK", if requested, the request identification number field will be set to correspond to the request number from the MRQ frame, or if the MFB frame is transmitted as much or as actively as possible, Set to "0", the response time policy field is set to "Li" That is, (ie, SIFS), "delay", or "active provision", the aggregate format field can be set to "A-MPDU", "RIFS-PPDU", or "non-aggregate (No- Aggregation). The ACK policy field, the request identification number field, the response time policy field, and the operation of the aggregate format field are the same as the MRQ frame, and are not repeated here for simplicity. The MCS feedback field will include the MCS response.

The TRQ frame is a management frame of the category HT. The TRQ frame requires that the next transmission of the responder 204 be an audible PPDU with a well-defined physical layer attribute, and the TRQ frame will include, in addition to a channel utterance parameter field, as shown in Table 3. , an ACK policy field, a request identification number field, a response time policy field, and an aggregate format field, wherein the ACK policy field is set to "non-ACK ( No-ACK)" or "ACK", the request identification number field is set to a request number based on the training program, and the response time policy field is set to "immediately" (ie, SIFS) ), "Delayed", or "Proactively Provided", the aggregate format field can be set to "A-MPDU", "RIFS-PPDU", or "No-Aggregation". The ACK policy field, the request identification number field, the response time policy field, and the operation of the aggregate format field are the same as the MRQ frame, and are not repeated here for simplicity. The channel utterance parameter field indicates the number and type of HT-long training fields (LTF), the number of transmission and reception antennas, or the like.

The new fields (ie, an ACK policy field, a request identification number field, a response time policy field, and one or more of an aggregate format field) may be included in any type. In the frame of the state, for example, a mode request frame, a mode response frame, a MIMO channel request frame, a MIMO channel response frame, a CSI feedback request frame, a CSI feedback response frame, and a The calibration start frame, a calibration vocal response frame, a transmission antenna selects the audible request frame, an antenna selects the feedback frame, or the like.

The mode request frame and the mode response frame are used to exchange the optimal transmission mode to use high input inertia communication, the MIMO channel request frame, the MIMO channel response frame, and the CSI feedback request frame. And the CSI feedback response frame is used to exchange CSI between the initiator 202 and the responder 204. The calibration start frame and the calibration utterance response frame are used for calibration purposes. To remove the difference between the transmit and receive chains in the initiator 202 and the responder 204, the transmit antenna selects the vocal request frame and the antenna selects the feedback frame. The initiator 202 or the responder 204 utilizes antenna selection.

Figure 3 is a diagram showing an exemplary procedure 300 for packet exchange between an initiator 302 and a responder 304 in accordance with the present invention, which uses an A-MPDU having an ACK policy as the No- of the MMPDU. ACK. The initiator 302 generates a request-to-send (RTS) frame 312 when a data is sent to the responder 304, and utilizes a basic rate non-aggregated (basic rate non-aggregated). The PPDU 314 sends the RTS frame 312 to the responder 304, and after receiving the RTS frame 312, the responder 304 sends a clear send using a basic rate non-aggregated PPDU 318. A clear-to-send (CTS) frame 316 is sent to the initiator 302. Then, after receiving the CTS frame 316, the initiator 302 generates an A-MPDU 320, including an MRQ MMPDU. 320a, a data MPDU 320b, and a BAR MPDU 320c, wherein the A-MPDU 320 is transmitted using an aggregated PPDU (A-PPDU) 322 generated based on the base MIMO and the preset value MCS. .

Since the ACK policy field of the MRQ MMPDU 320a is set to No-ACK (non-ACK), the responder 304 will not send an ACK to confirm the reception of the MRQ MMPDU 320a. Next, an MFB MMPDU 314 a is directly transmitted, and then the responder 304 generates an A-MPDU 324 including the MFB MMPDU 324 a and a BA 324 b to confirm receipt of the data MPDU 320b, and will utilize An A-PPDU 326 is sent to transmit the A-MPDU 324.

The initiator 302 receives the MFB MMPDU 324a and selects an optimal MCS in accordance with the MCS feedback included in the MFB MMPDU 324a. Then, the initiator 302 generates another A- The MPDU 328 includes a data MPDU 328 a and a BAR MPDU 328 b, and is transmitted using an A-PPDU 330 that has been optimized for its own rate based on the MCS feedback, and then the responder In order to respond to the BAR MPDU 328b, a BA 332 is sent using a non-aggregated PPDU 334. After successfully transmitting the data, the initiator 302 then utilizes a basic rate non-aggregated PPDU. 338 sends a CF-Poll END frame 336, which releases the TXOP.

Figure 4 is a diagram showing an exemplary process 400 for packet exchange between an initiator 402 and a responder 404 in accordance with the present invention, which uses an A-MPDU having an ACK policy as the No- of the MMPDU. ACK. The initiator 402 generates an RTS frame 412 when a data is sent to the responder 404, and transmits the RTS frame using a basic rate non-aggregated PPDU 414. The responder 404, after receiving the RTS frame 412, the responder 404 transmits a CTS frame 416 to the initiator 402 using a basic rate non-aggregated PPDU 418, and then receives the CTS. After the frame 416, the initiator 402 generates an A-MPDU 420, including a TRQ MMPDU 420a, an MRQ MMPDU 420b, and a data MPDU 420c. And a BAR MPDU 420 d, wherein the A-MPDU 420 is transmitted by using an aggregated PPDU 422 generated based on the base MIMO and the preset value MCS.

Since the TRQ MMPDU 420a and the ACK policy fields of the MRQ MMPDU 420b are set to No-ACK (non-ACK), the responder 404 will not send a confirmation for the MRQ MMPDU 420b. In the case of the received individual ACK, an MFB MMPDU 414 a is directly transmitted, and then the responder 404 generates an A-MPDU 424 including the MFB MMPDU 424 a and a BA 424 b, and will utilize one The A-PPDU 426 is uttered, as requested by the TRQ MMPDU 420a, for transmission.

Then, the initiator 402 receives the utterance PPDU 426, and the channel state information (CSI) is evaluated based on the utterance PPDU 426, and the evaluated CSI is used under The MIMO parameter is set in the transmission of the packet, and the initiator 402 also receives the MFB MMPDU 424 a and selects an optimal one according to the MFB frame included in the MFB MMPDU 424 a. MCS, then, the initiator 402 will generate another A-MPDU 428, including a TRQ MMPDU 428a, an MRQ MMPDU 428b, a data MPDU 428c, and a BAR MPDU 428d, and will utilize an A-PPDU. 430 is configured to transmit the A-MPDU 428, wherein the A-PPDU 430 is generated based on a MIMO parameter and an MCS optimized according to the CSI and the MFB, and then the responder 404 receives the A-MPDU 428, and generates another A-MPDU, including an MFB MMPDU 432a and a BA 432b, which are transmitted using another utterance PPDU 434, and then the initiator 402 receives the utterance A- PPDU 434, evaluating CSI, and selecting based on the MFB MCS, and the initiator 402 generates another A-MPDU, including the data MPDU 436a and a BAR MPDU 436b, which are then transmitted using an A-PPDU 438, wherein the A-PPDU is The MIMO parameters are generated based on the MCS updated in accordance with the second CSI and the MFB, and then the responder 404 utilizes a non-aggregated PPDU 442 in order to respond to the BAR MPDU 426b. A BA 440 is transmitted, and after successfully transmitting the data, the initiator 402 transmits a CF-Poll END frame 444 using a basic rate, non-aggregated PPDU 446, thereby releasing the TXOP.

Figure 5 is a diagram showing an exemplary procedure 500 for packet exchange between an initiator 502 and a responder 504 in accordance with the present invention, which specifies an RIFS with an ACK policy as a No-ACK for the MMPDU. . The initiator 502 generates an RTS frame 512 when a data is sent to the responder 504, and sends the RTS frame 512 to the responder 504 using a basic rate non-aggregated PPDU 514. After receiving the RTS frame 512, the responder 504 sends a CTS frame 516 to the initiator 502 using a basic rate non-aggregated PPDU 518, and then, after receiving the CTS frame 516, The initiator 502 generates an MRQ MMPDU 520 and transmits the MRQ MMPDU 520 using a basic rate non-aggregated PPDU 522. In the event that the TXOP is not released, the initiator 502 will also generate an A-MPDU 524, including the data MPDU 524a, and a BAR MPDU 524b, and, after the RIFS from the transmission of the PPDU 522, The A-MPDU 524 is transmitted using an A-PPDU 526 generated based on a base MIMO and a preset value MCS.

Since the ACK policy field of the MRQ MMPDU 520 is set to No-ACK (non-ACK), after receiving the MRQ MMPDU 520, the responder 504 will directly send an ACK without directly transmitting The MFB MMPDU 528 is sent, and in the event that the TXOP is not released, the responder 504 generates a BA frame 532 for acknowledging the data MPDU 524a and will be transmitted from the PPDU 530. After the RIFS, the BA 532 is sent using a non-aggregated PPDU 534.

The initiator 502 receives the MFB MMPDU 528 and selects an optimal MCS according to the MFB included in the MFB MMPDU 528. Then, the initiator 502 generates a second A. - MPDU 536, comprising data MPDU 536a and a BAR MPDU 536b, and transmitting the first using an A-PPDU 538 that has been generated based on the underlying MIMO parameters and the MCS optimized for the MFB The second A-MPDU 536, then the responder 504 will send a BA 332 using a non-aggregated PPDU 542 to acknowledge receipt of the data MPDU 536a and, after successful transmission of the data The initiator 502 will send a CF-Poll END frame using a basic rate, non-aggregated PPDU 546, thereby releasing the TXOP.

Figure 6 shows an initiator 602 and a responder in accordance with the present invention. Another exemplary procedure 600 for packet exchange between 604 is to designate an RIFS with an ACK policy as a No-ACK for the MMPDU. The initiator 602 generates an RTS frame 612 when a data is sent to the responder 604, and transmits the RTS frame using a basic rate non-aggregated PPDU 614. The responder 604, after receiving the RTS frame 612, the responder 604 sends a CTS frame 616 to the initiator 602 using a basic rate non-aggregated PPDU 618, and then receives the CTS. After frame 616, the initiator 602 will generate a TRQ MMPDU 620 and will transmit the TRQ MMPDU 620 using a non-aggregated PPDU 622. Among the same TXOPs, the initiator 602 will also generate an MRQ MMPDU 624, and will then transmit the MRQ MMPDU 624 using a non-aggregated PPDU 626 from the RIFS of the transmission of the PPDU 622, and, similarly, Among the same TXOPs, the initiator 502 also generates an A-MPDU 628, including a data MPDU 628a, and a BAR MPDU 628b, and transmits the A-MPDU using an A-PPDU 630. 628, wherein the A-PPDU 630 is generated based on a base MIMO parameter and a preset value MCS.

The responder 604 receives the TRQ MMPDU 620 and the MRQ MMPDU 624 and generates an MFB MMPDU 632 for transmission via an audible A-PPDU 634 as requested by the TRQ MMPDU 632. Moreover, since the ACK policy field of the TRQ MMPDU 620 and the MRQ MMPDU 624 is set to No-ACK (non-ACK), the responder 604 will not send a check for the TRQ MMPDU 620 and In the case of an individual ACK of the MRQ MMPDU 624, an MFB MMPDU 632 is sent directly.

Among the same TXOPs, the responder 604 also generates a BA 636 to acknowledge receipt of the data MPDU 628a and, after a RIFS from the transmission of the PODU 634, utilizes a non-aggregated PPDU 638. Send the BA 636.

Then, the initiator 602 receives the utterance PPDU 634, and evaluates the CSI based on the utterance PPDU 634, and the evaluated CSI is used to set the MIMO parameter in the transmission of the next packet. In addition, the initiator 602 also receives the MFB MMPDU 632 and selects an optimal MCS in accordance with the MFB included in the MFB MMPDU 632.

The initiator 602 generates a second TRQ MMPDU 640 and transmits it via an A-PPDU 642. Among the same TXOPs, the initiator also generates a second MRQ MMPDU 644 and transmits it using a-PPDU 646 after the RIFS from the transmission of the A-PPDU 642, and, similarly, Among the same TXOPs, the initiator 602 generates an A-MPDU 648, including the data MPDU 648a and a BAR MPDU 618b, and utilizes an A- after the RIFS from the transmission of the PPDU 646. The PPDU 650 transmits the A-MPDU 648, wherein the A-PPDUs 642,646 are generated based on MIMO parameters and an MCS optimized according to the CSI and the MFB.

The responder 604 receives the second TRQ MMPDU 640 and the second MRQ MMPDU 644 and generates a second MFB MMPDU 652, which is then transmitted by a second utterance A-PPDU 654. Among the same TXOPs, the responder 604 also generates a BA 656 to acknowledge receipt of the data MPDU 648a and will transmit the BA 656 using a non-aggregated PPDU 658.

After receiving the second utterance A-PPDU 654, including the second MFB MMPDU 652, the initiator 602 then evaluates the CSI and bases on the new MFB included in the MFB MMPDU 652. Selecting an MCS, the initiator 602 then generates a third A-MPDU 670, including data MPDU 670a and a BAR MPDU 670b, and utilizes a MIMO parameter and a updated CSI and MFB. The third A-MPDU 670 is transmitted by the optimized MCS as a basis for the generated A-PPDU 672.

The responder 604 receives the A-MPDU 670 and sends a BA 674 with a non-aggregated PPDU 676 to acknowledge receipt of the data MPDU 670a, after the successful transmission of the data, then the start The 602 sends a CF-Poll END frame 678 using a basic rate, non-aggregated PPDU 680 to release the TXOP.

According to another embodiment of the present invention, the action, management, or control frame can be processed in a priority order through the data frame, and the priority processing order can be performed in the action, management, or control. A specified field in the frame is accurately reached, or when accessing the wireless medium is involved, the action is processed by using a higher priority, The hardware or software of the management or control frame is implemented and implemented in an inclusive manner. Such a priority processing scheme can be used for all actions, management, or control frames suggested by TGnSync, or WWiSE, especially Actions for transport mode feedback and channel feedback (eg, mode request, mode response, MIMO channel request, and MIMO channel response, MRQ, TRQ, etc.) and management frames.

Although the features and elements of the present invention are described in terms of a preferred combination of specific embodiments, each feature or component can be used separately without the need for additional features and components of the preferred embodiment. Or in combination with or without the other features and elements of the invention.

ACK‧‧‧Confirm

SIFS‧‧‧Short Interframe Space

Claims (19)

Means for a frame exchange between a plurality of communication entities in a wireless local area network (WLAN), the apparatus comprising: transmitting a request frame from a starting station, wherein the request frame indicates an immediate feedback, Aggregate feedback or a delayed feedback will be transmitted; and in the event that an acknowledgment (ACK) frame for acknowledging receipt of the request frame is not received, a response frame is received to respond to the request frame. The method of claim 1, wherein the response frame is received within a short inter-frame interval (SIFS) of the request frame, piggybacked on another frame, and aggregated with another frame. Or receiving without receiving the individual ACK frame by default. The method of claim 1, wherein the request frame includes an ACK policy field, the ACK policy field indicating whether an ACK frame is to be transmitted to confirm receipt of the request frame, thereby, In the case where the ACK policy field indicates that no individual ACK frame should be transmitted, the response frame is received without receiving an ACK frame. The method of claim 1, wherein the request frame includes a request identification number field indicating a request identification number, and indicating whether the response frame should be transmitted immediately or within a predetermined time period. The response time policy field, a response time policy field indicating a time for transmitting the request frame, or an aggregation policy field indicating whether the response frame can be aggregated with at least one other frame. The method of claim 4, wherein the aggregation policy field indicates that a plurality of packets should be transmitted in a reduced interframe space (RIFS). The method of claim 1, wherein the request frame and the response frame are a management frame, a motion frame, a control frame or a data frame. The method of claim 6, wherein the priority order of the management frame is higher than the data frame. The method of claim 7, wherein a priority order is indicated by a field indicating a priority order of the management frame. The method of claim 1, wherein the request frame and the response frame are different types of frames. The method of claim 1, wherein the request frame includes a modulation and coding The scheme (MCS) request, and the response frame includes an MCS feedback, whereby a frame is generated based on the MCS feedback. A station for frame exchange between a plurality of communication entities in a wireless local area network, the station comprising: a transmitter configured to transmit a request frame, wherein the request frame indicates an immediate feedback, An aggregate feedback or a delayed feedback will be transmitted; and a receiver configured to receive a response frame without receiving an acknowledgment (ACK) frame for acknowledging receipt of the request frame Back to the request frame. The station of claim 11, wherein the receiver is configured to receive the response frame within an inter-frame interval (SIFS) of the request frame. The station of claim 11, wherein the receiver is configured to receive a response frame, the response frame being piggybacked on another frame or aggregated with another frame. The station of claim 11, wherein the receiver is configured to receive the response frame without receiving the individual ACK frame by default. The station of claim 11, wherein the transmitter is configured to transmit a request frame, the request frame includes an ACK policy field, and the ACK policy field indicates whether an ACK frame should be It is transmitted to confirm receipt of the request frame, whereby the response frame is received without receiving an ACK message if the ACK policy field indicates that no individual ACK frame should be transmitted. The station of claim 11, wherein the transmitter is configured to transmit a request frame, the request frame includes a request identification number field indicating a request identification number, indicating whether the transmitter should Sending a response time policy field of the response frame immediately or within a predetermined time period, indicating whether a second station should transmit a response time policy field of the response frame at a predetermined time, or indicate the response Whether the frame can be aggregated with another frame of an aggregation policy field. The station of claim 11, wherein the transmitter is configured to transmit an aggregation policy field indicating that a plurality of packets should be transmitted within a reduced interframe space (RIFS). The station of claim 11, wherein the transmitter is configured to transmit a request frame including a modulation and coding scheme (MCS) request, and the receiver is configured Used to receive a response frame including an MCS feedback. The station of claim 11, wherein the receiver is configured to receive a response frame to initiate a multiple input multiple output (MIMO) channel evaluation.