Source: https://patents.google.com/patent/US9806848B2/en
Timestamp: 2018-06-23 05:02:15
Document Index: 3341035

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

US9806848B2 - Systems, methods and apparatus for determining control field and modulation coding scheme information - Google Patents
Systems, methods and apparatus for determining control field and modulation coding scheme information Download PDF
US9806848B2
US9806848B2 US13247144 US201113247144A US9806848B2 US 9806848 B2 US9806848 B2 US 9806848B2 US 13247144 US13247144 US 13247144 US 201113247144 A US201113247144 A US 201113247144A US 9806848 B2 US9806848 B2 US 9806848B2
US13247144
US20120257606A1 (en )
This application claims the benefit of U.S. Provisional Application No. 61/387,542, filed Sep. 29, 2010; U.S. Provisional Application No. 61/389,495, filed Oct. 4, 2010; U.S. Provisional Application No. 61/405,283, filed Oct. 21, 2010; U.S. Provisional Application No. 61/422,098, filed Dec. 10, 2010; U.S. Provisional Application No. 61/432,115, filed Jan. 12, 2011; U.S. Provisional Application No. 61/405,194, filed Oct. 20, 2010; and U.S. Provisional Application No. 61/409,645, filed Nov. 3, 2010; the entire content of each of which is incorporated herein by reference. This application further claims the benefit of U.S. Provisional Application No. 61/414,651, filed Nov. 17, 2010. This application is related to U.S. application Ser. No. 13/247,023, titled “SYSTEMS AND METHODS FOR COMMUNICATION OF CHANNEL STATE INFORMATION,” filed on even date herewith, U.S. application Ser. No. 13/247,047, titled “SYSTEMS AND METHODS FOR COMMUNICATION OF CHANNEL STATE INFORMATION,” filed on even date herewith, U.S. application Ser. No. 13/247,062, titled “SYSTEMS AND METHODS FOR COMMUNICATION OF CHANNEL STATE INFORMATION,” filed on even date herewith, U.S. application Ser. No. 13/247,086, titled “SYSTEMS AND METHODS FOR COMMUNICATION OF CHANNEL STATE INFORMATION,” filed on even date herewith, U.S. application Ser. No. 13/247,100, titled “SYSTEMS, METHODS AND APPARATUS FOR DETERMINING CONTROL FIELD AND MODULATION CODING SCHEME INFORMATION,” filed on even date herewith, U.S. application Ser. No. 13/247,124, titled “SYSTEMS, METHODS AND APPARATUS FOR DETERMINING CONTROL FIELD AND MODULATION CODING SCHEME INFORMATION,” filed on even date herewith, each of which are incorporated herein by reference, in their entirety.
Various embodiments of systems, methods and devices within the scope of the appended claims each have several aspects, no single one of which is solely responsible for the desirable attributes described herein. Without limiting the scope of the appended claims, some prominent features are described herein. After considering this discussion, and particularly after reading the section entitled “Detailed Description” one will understand how the features of various embodiments are used to manage monitoring of a page channel or the like.
Certain aspects of this disclosure provide a method of wireless communication. The method comprises receiving a frame comprising an indicator signifying that the frame is unsolicited, the frame further comprising first and second fields. The method comprises identifying a most recent communication having fields that match the first and second fields. The method comprises determining a modulation coding scheme (MCS) based at least on the identified communication and the received indicator. The method comprises transmitting data using the determined MCS.
Certain aspects of this disclosure provide a method of wireless communication. The method comprises receiving a frame. The method comprises determining a type of the frame. The method comprises determining a modulation coding scheme (MCS) based at least on the determined frame type. The method comprises transmitting data using the determined MCS.
Certain aspects of this disclosure provide an apparatus for wireless communication. The apparatus comprises a receiver configured to receive a frame comprising an indicator signifying that the frame is unsolicited, the frame further comprising first and second fields. The apparatus comprises a processor. The processor is configured to identify a most recent communication having fields that match the first and second fields. The processor is configured to determine a modulation coding scheme (MCS) based at least on the identified communication and the received indicator. The apparatus comprises a transmitter configured to transmit data using the determined MCS.
Certain aspects of this disclosure provide an apparatus for wireless communication. The apparatus comprises a receiver configured to receive a frame. The apparatus comprises a processor. The processor is configured to determine a type of the frame. The processor is configured to determine a modulation coding scheme (MCS) based at least on the determined frame type. The apparatus comprises a transmitter configured to transmit data using the determined MCS.
Certain aspects of this disclosure provide an apparatus for wireless communication. The apparatus comprises means for receiving a frame comprising an indicator signifying that the frame is unsolicited, the frame further comprising first and second fields. The apparatus comprises means for identifying a most recent communication having fields that match the first and second fields. The apparatus comprises means for determining a modulation coding scheme (MCS) based at least on the identified communication and the received indicator. The apparatus comprises means for transmitting data using the determined MCS.
Certain aspects of this disclosure provide an apparatus for wireless communication. The apparatus comprises means for receiving a frame. The apparatus comprises means for determining a type of the frame. The apparatus comprises means for determining a modulation coding scheme (MCS) based at least on the determined frame type. The apparatus comprises means for transmitting data using the determined MCS.
Certain aspects of this disclosure provide a computer program product for wirelessly communicating comprising a computer readable medium comprising instructions. The instructions when executed cause an apparatus to receive a frame comprising an indicator signifying that the frame is unsolicited, the frame further comprising first and second fields. The instructions when executed cause an apparatus to identify a most recent communication having fields that match the first and second fields. The instructions when executed cause an apparatus to determine a modulation coding scheme (MCS) based at least on the identified communication and the received indicator. The instructions when executed cause an apparatus to transmit data using the determined MCS.
Certain aspects of this disclosure provide a computer program product for wirelessly communicating comprising a computer readable medium comprising instructions. The instructions when executed cause an apparatus to receive a frame. The instructions when executed cause an apparatus to determine a type of the frame. The instructions when executed cause an apparatus to determine a modulation coding scheme (MCS) based at least on the determined frame type. The instructions when executed cause an apparatus to transmit data using the determined MCS.
Certain aspects of this disclosure provide an wireless node for wireless communication. The wireless node comprises an antenna. The wireless node comprises a receiver configured to receive, via the antenna, a frame comprising an indicator signifying that the frame is unsolicited, the frame further comprising first and second fields. The wireless node comprises a processor. The processor is configured to identify a most recent communication having fields that match the first and second fields. The processor is configured to determine a modulation coding scheme (MCS) based at least on the identified communication and the received indicator. The wireless node comprises a transmitter configured to transmit data using the determined MCS.
Certain aspects of this disclosure provide an wireless node for wireless communication. The wireless node comprises an antenna. The wireless node comprises a receiver configured to receive, via the antenna, a frame. The wireless node comprises a processor. The processor is configured to determine a type of the frame. The processor is configured to determine a modulation coding scheme (MCS) based at least on the determined frame type. The wireless node comprises a transmitter configured to transmit data using the determined MCS.
FIG. 12 illustrates a block diagram of an example access point in accordance with certain aspects of the present disclosure.
FIG. 2 illustrates a block diagram of access point 110 and two user terminals 120 m and 120 x in MIMO system 100. The access point 110 is equipped with Nt antennas 224 a through 224 t. User terminal 120 m is equipped with Nut,m antennas 252 ma through 252 mu, and user terminal 120 x is equipped with Nit,x antennas 252 xa through 252 xu. The access point 110 is a transmitting entity for the downlink and a receiving entity for the uplink. Each user terminal 120 is a transmitting entity for the uplink and a receiving entity for the downlink. As used herein, a “transmitting entity” is an independently operated apparatus or device capable of transmitting data via a wireless channel, and a “receiving entity” is an independently operated apparatus or device capable of receiving data via a wireless channel. In the following description, the subscript “dn” denotes the downlink, the subscript “up” denotes the uplink, Nup user terminals are selected for simultaneous transmission on the uplink, Ndn user terminals are selected for simultaneous transmission on the downlink, Nup may or may not be equal to Ndn, and Nup and Ndn may be static values or can change for each scheduling interval. The beam-steering or some other spatial processing technique may be used at the access point and user terminal.
The wireless system 100 illustrated in FIG. 1 may operate in accordance with IEEE 802.11ac wireless communications standard. The IEEE 802.11 ac represents a new IEEE 802.11 amendment that allows for higher throughput in IEEE 802.11 wireless networks. The higher throughput may be realized through several measures such as parallel transmissions to multiple stations (STAs) at once, or by using a wider channel bandwidth (e.g., 80 MHz or 160 MHz). The IEEE 802.11ac is also referred to as Very High Throughput (VHT) wireless communications standard.
As represented by block 7-9, the method includes determining if the value of the subfield is “11”. If the value of the subfield is not “11”, as represented by block 7-10, the method includes treating the subfield as a reserved value. If the value of the subfield is not “11”, as represented by block 7-11, the method includes reporting an error. In some aspects, the value of the subfield may indicate whether the MCS type is MU MIMO or single user MIMO. Further, the subfield may indicate whether the single user MIMO is open loop single user MIMO or transmit beam forming single user MIMO.
In another implementation, the VHT control field includes a link adaptation control subfield having an indicator that is at least four bits. FIG. 7B illustrates an example of a link adaptation control subfield 750 where 4 bits of the link adaptation control subfield 750 may be used as an indicator. The link adaptation control subfield 750 includes a RSVD field 752 comprising 1 bit, followed by a MFSI_L field 754 comprising 1 bit, followed by a MAI field 756 comprising 4 bits, followed by a MFSI_H field 758 comprising 3 bits, followed by a MFB/ASELC field 760 comprising 7 bits. The four bits of the link adaptation control subfield 750 that make up the indicator may be the second, seventh, eighth and ninth bits of the link adaptation control subfield 750. As shown, the second bit is the MFSI_L field 754, and the seventh, eighth and ninth bits of the indicator is the MFSI_H field 758. The value of the four bit indicator can be used to communicate information such as the MCS type. For example, in one implementation an indicator value of ‘1100’ can be used to indicate that the MCS type comprises OL MIMO. Additionally, an indicator value of ‘1001’ can be used to indicate that the MCS type comprises open TxBF. Additionally, an indicator value of ‘1010’ can be used to indicate that the MCS type comprises MU MIMO. Additionally, at least some of the values from ‘1011’ to ‘1111’ can be utilized as reserved indicator sequences, one or more of which can later be used to represent other information.
In some aspects, the user terminal 120 may be configured to transmit an unsolicited MFB to the AP 110, meaning the user terminal 120 sends an MFB without receiving a request for an MFB from the AP 110. The AP 110 is not expecting the MFB, and therefore does not know which communication (e.g., which PPDU) from the AP 110 the user terminal 120 based the MFB on. The AP 110 needs to know which communication the user terminal 120 based the MFB on in order to properly select an MCS for communication.
Accordingly, when the AP 110 receives the unsolicited MFB, the AP 110 first determines it is an unsolicited MFB. The AP 110 may make this determination based on an indicator (e.g., a field (e.g., an MFSI (MCS Feedback (MFB) Sequence Identifier) field) in the MFB that indicates it is an unsolicited MFB. The AP 110 then determines which communication (e.g., one of a plurality of communications the AP 110 transmitted to the user terminal 120) the MFB is based on. In order to help the AP 110 make this determination, the MFB may also include one or more group ID (GID) fields, a coding type field, a beamforming field, a MCS field, other fields derived from a most recently received PPDU (e.g., derived from an RXVECTOR of the PPDU) at the user terminal 120, and/or an may be transmitted using a particular MCS. The AP 110 may then identify which communication the AP 110 most recently sent to the user terminal 120 has a GID, a beamforming value, and/or used a MCS that matches that of the MFB. The communication most recently sent in time with matching characteristics is identified as the communication for which the MFB was sent. The AP 110, using the MFB and the identified communication, may then determine an MCS for the user terminal 120 to use. The AP 110 may also determine whether the MFB information was estimated for single user multiple input multiple output communication (MIMO) or multiple user MIMO communication based on the group ID and/or the beamforming field in the MFB. For example, the AP 110 may also determine whether the MFB information was estimated for open loop single user multiple input multiple output communication (MIMO), transmit beam forming MIMO, or multiple user MIMO based on the group ID and/or the beamforming field in the MFB. The AP 110 may then transmit an indication to the user terminal 120 of the MCS to be used and/or transmit data itself using the MCS.
The various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and/or software component(s) and/or module(s), including, but not limited to a circuit, an application specific integrate circuit (ASIC), or processor. Generally, where there are operations, module, or steps illustrated in Figures, those operations may have corresponding counterpart means-plus-function components. For example, an access point may comprise means for receiving a frame comprising an indicator signifying that the frame is unsolicited, the frame further comprising first and second fields, means for identifying a most recent communication having fields that match the first and second fields, means for determining a modulation coding scheme (MCS) based at least on the identified communication and the received indicator, and means for transmitting data indicative of the determined MCS. In another example, an access point may comprise means for receiving a frame, means for determining a type of the frame, means for determining a modulation coding scheme (MCS) based at least on the determined frame type, and means for transmitting data indicative of the determined MCS.
FIG. 12 illustrates a block diagram of an example access point 1200 in accordance with certain aspects of the present disclosure. Access point 1200 comprises a receiving module 1205 which may be configured to perform the functions of the means for receiving discussed above. In some aspects, the receiving module may correspond to one or more of the receivers 222 of FIG. 2. Access point 1200 further comprises a determining module 1210 which may be configured to perform the functions of the means for determining discussed above. In some aspects, the determining module may correspond to the controller 280 of FIG. 2. Access point 1200 further comprises an identifying module 1215 which may be configured to perform the functions of the means for identifying discussed above. In some aspects, the processing module may correspond to the controller 280 of FIG. 2. Access point 1200 further comprises a transmitting module 1220 which may be configured to perform the functions of the means for transmitting discussed above. In some aspects, the receiving module may correspond to one or more of the transmitters 222 of FIG. 2.
1. A method of wireless communication by an apparatus, comprising:
receiving, from a wireless node, a frame comprising an indicator signifying that the frame is unsolicited, the frame further comprising first and second fields;
identifying a most recent transmission, from the apparatus to the wireless node, having fields that match the first and second fields; and
determining a modulation coding scheme (MCS) based at least on the identified transmission and the received indicator.
2. The method of claim 1, wherein the first and second fields comprise at least two of the following field types: group ID, beamforming, and MCS.
3. The method of claim 2, wherein the determination comprises estimating the MCS for either single user multiple input multiple output communication (MIMO) or multiple user MIMO communication based on at least one of the group ID field or the beamforming field.
4. The method of claim 3, wherein estimating the MCS for single user MIMO comprises estimating the MCS for either open loop single user MIMO or transmit beam forming single user MIMO.
transmitting data using the determined MCS.
transmitting data indicative of the determined MCS.
7. The method of claim 1, further comprising transmitting the determined MCS to the wireless node.
a receiver configured to receive, from a wireless node, a frame comprising an indicator signifying that the frame is unsolicited, the frame further comprising first and second fields; and
identify a most recent transmission, from the apparatus to the wireless node, having fields that match the first and second fields; and
determine a modulation coding scheme (MCS) based at least on the identified transmission and the received indicator.
9. The apparatus of claim 5, wherein the first and second fields comprise at least two of the following field types: group ID, beamforming, MCS.
10. The apparatus of claim 9, wherein the processing system is further configured to determine the MCS by estimating the MCS for either single user multiple input multiple output communication (MIMO) or multiple user MIMO communication based on at least one of the group ID field or the beamforming field.
11. The apparatus of claim 10, wherein the processing system is further configured to estimate the MCS for single user MIMO by estimating the MCS for either open loop single user MIMO or transmit beam forming single user MIMO.
a transmitter configured to transmit data using the determined MCS.
a transmitter configured to transmit data indicative of the determined MCS.
14. The apparatus of claim 8, further comprising a transmitter configured to transmit the determined MCS to the wireless node.
means for receiving, from a wireless node, a frame comprising an indicator signifying that the frame is unsolicited, the frame further comprising first and second fields;
means for identifying a most recent transmission, from the apparatus to the wireless node, having fields that match the first and second fields; and
means for determining a modulation coding scheme (MCS) based at least on the identified transmission and the received indicator.
16. The apparatus of claim 15, wherein the first and second fields comprise at least two of the following field types: group ID, beamforming, and MCS.
17. The apparatus of claim 16, wherein the means for determining comprises means for estimating the MCS for either single user multiple input multiple output communication (MIMO) or multiple user MIMO communication based on at least one of the group ID field or the beamforming field.
18. The apparatus of claim 17, wherein the means for estimating the MCS for single user multiple input multiple output communication (MIMO) comprises means for estimating the MCS for either open loop single user MIMO or transmit beam forming single user MIMO.
means for transmitting data using the determined MCS.
means for transmitting data indicative of the determined MCS.
21. The apparatus of claim 15, further comprising means for transmitting the determined MCS to the wireless node.
22. A non-transitory computer readable medium comprising instructions that when executed cause an apparatus to:
receive, from a wireless node, a frame comprising an indicator signifying that the frame is unsolicited, the frame further comprising first and second fields;
23. A wireless node for wireless communication, comprising:
a receiver configured to receive, via the antenna and from another wireless node, a frame comprising an indicator signifying that the frame is unsolicited, the frame further comprising first and second fields; and
identify a most recent transmission, from the wireless node to the other wireless node, having fields that match the first and second fields; and
US13247144 2010-09-29 2011-09-28 Systems, methods and apparatus for determining control field and modulation coding scheme information Active 2034-10-10 US9806848B2 (en)
US13247144 US9806848B2 (en) 2010-09-29 2011-09-28 Systems, methods and apparatus for determining control field and modulation coding scheme information
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KR20137011020A KR101539427B1 (en) 2010-09-29 2011-09-29 Systems, methods and apparatus for determining control field and modulation coding scheme information
JP2013531885A JP5607257B2 (en) 2010-09-29 2011-09-29 System for determining the control field and modulation coding scheme information, a method and apparatus
EP20110770953 EP2622770B1 (en) 2010-09-29 2011-09-29 Method and apparatus for determining control field and modulation coding scheme information
PCT/US2011/054079 WO2012044861A1 (en) 2010-09-29 2011-09-29 Systems, methods and apparatus for determining control field and modulation coding scheme information
US20120257606A1 true US20120257606A1 (en) 2012-10-11
US9806848B2 true US9806848B2 (en) 2017-10-31
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US13247144 Active 2034-10-10 US9806848B2 (en) 2010-09-29 2011-09-28 Systems, methods and apparatus for determining control field and modulation coding scheme information
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WO (1) WO2012044861A1 (en)
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