Source: https://patents.google.com/patent/US8724546B2/en
Timestamp: 2020-01-24 14:15:12
Document Index: 63509070

Matched Legal Cases: ['art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11']

US8724546B2 - Training sequence indication for WLAN - Google Patents
Training sequence indication for WLAN Download PDF
US8724546B2
US8724546B2 US12/910,628 US91062810A US8724546B2 US 8724546 B2 US8724546 B2 US 8724546B2 US 91062810 A US91062810 A US 91062810A US 8724546 B2 US8724546 B2 US 8724546B2
US12/910,628
US20110096797A1 (en
2009-10-23 Priority to US25460809P priority Critical
2009-10-26 Priority to US25503809P priority
2009-11-09 Priority to US25958409P priority
2009-11-12 Priority to US26072909P priority
2010-01-13 Priority to US29472910P priority
2010-02-24 Priority to US30778010P priority
2010-04-06 Priority to US32139010P priority
2010-10-22 Priority to US12/910,628 priority patent/US8724546B2/en
2010-10-22 Application filed by Marvell World Trade Ltd filed Critical Marvell World Trade Ltd
2010-10-25 Assigned to MARVELL SEMICONDUCTOR, INC. reassignment MARVELL SEMICONDUCTOR, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BANERJEA, RAJA, LIU, YONG, ZHANG, HONGYUAN, YU, MAO
2010-10-25 Assigned to MARVELL INTERNATIONAL LTD. reassignment MARVELL INTERNATIONAL LTD. LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: MARVELL WORLD TRADE LTD.
2010-10-25 Assigned to MARVELL WORLD TRADE LTD. reassignment MARVELL WORLD TRADE LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MARVELL INTERNATIONAL, LTD.
2010-10-25 Assigned to MARVELL INTERNATIONAL LTD. reassignment MARVELL INTERNATIONAL LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MARVELL SEMICONDUCTOR, INC.
2011-04-28 Publication of US20110096797A1 publication Critical patent/US20110096797A1/en
2014-05-13 Publication of US8724546B2 publication Critical patent/US8724546B2/en
239000003138 indicator Substances 0 abstract description 43
The present application is also related to U.S. patent application Ser. No. 12/910,608, entitled “Number of Streams Indication for WLAN,” filed on the same day as the present application, which is hereby incorporated by reference herein in its entirety.
For example, the AP 14 assigns a unique index value to each of the client stations 25 prior to transmission of the data unit 100 by first transmitting a sounding frame to each of the client stations 25. The sounding frame includes one or more group definition fields. FIG. 4 is a diagram of an example group definition field 160. The group definition field 160 includes a group identifier (group ID) subfield 162 and one or more association identifier (AID) subfields 164. The AID subfields 164 include as many subfields as there are MU-MIMO users assigned to a group identified by the group ID subfield 162 (i.e., an “MU group”). For example, as shown in FIG. 4, the AID subfields 164 include a first AID (AID1) subfield 164-1, a second AID (AID2) subfield 164-2, a third AID (AID3) subfield 164-3, and a fourth AID (AID4) subfield 164-4. In one embodiment, the group definition field 160 is generated by the PHY unit 20. In another embodiment, at least one of the AID subfields 164, and/or information included therein, are generated at least in part by the MAC unit 18.
including, in a first sub-field of a first field of the preamble, a first indicator of a first set of a plurality of training sequences that corresponds to transmission of the data unit to a first receiver;
including the plurality of training sequences in a second field of the preamble;
including, in a third field of the preamble, a group identification indicator, wherein the group identification indicator indicates either (i) that the data unit corresponds to only one receiver, or (ii) an address of a group of multiple receivers including the first receiver and at least a second receiver;
when the third field indicates that the data unit corresponds to only one receiver, including in a second sub-field of the first field of the preamble an indicator of the first receiver so that other receivers can determine that the data unit is not addressed to the other receivers;
when the third field indicates the address of the group of multiple receivers, including in the second sub-field of the first field of the preamble a second indicator of a second set of the plurality of training sequences that corresponds to transmission of the data unit to the second receiver; and
2. A method according to claim 1, wherein the first indicator indicates a first number of spatial or space-time streams that corresponds to transmission of the data unit to the first receiver.
3. A method according to claim 1, wherein the first indicator is a further indicator to the second receiver of the second set of the plurality of training sequences that corresponds to transmission of the data unit to the second receiver.
4. A method according to claim 1, further comprising communicating to the first receiver and the second receiver, before transmitting the first field of the preamble, an order in which the first indicator and the second indicator will be transmitted in the first field of the preamble.
generate a preamble of a data unit for transmission via a multiple input, multiple output (MIMO) communication channel, wherein,
the preamble includes, in a first sub-field of a first field, a first indicator of a first set of a plurality of training sequences that corresponds to transmission of the data unit to a first receiver,
the preamble includes, in a second field, the plurality of training sequences,
the preamble includes, in a third field, a group identification indicator, wherein the group identification indicator indicates either (i) that the data unit corresponds to only one receiver, or (ii) an address of a group of multiple receivers including the first receiver and at least a second receiver,
when the second field indicates that the data unit corresponds to only one receiver, the preamble includes in a second sub-field of the first field, an indicator of the first receiver so that other receivers can determine that the data unit is not addressed to the other receivers, and
when the second field indicates the address of the group of multiple receivers, the preamble includes, in the second sub-field of the first field, a second indication of a second set of the plurality of training sequences that corresponds to transmission of the data unit to a second receiver;
wherein the PHY unit is further configured to cause the first field of the preamble to be transmitted prior to the second field of the preamble being transmitted.
6. An apparatus according to claim 5, wherein the first indicator indicates a first number of spatial or space-time streams that corresponds to transmission of the data unit to the first receiver.
7. An apparatus according to claim 5, wherein the first indictor is a further indicator to the second receiver of the second set of the plurality of training sequences that corresponds to transmission of the data unit to the second receiver.
8. An apparatus according to claim 5, wherein the PHY unit is further configured to communicate to the first receiver and the second receiver, before transmitting the first field of the preamble, an order in which the first indicator and the second indicator will be transmitted in the first field of the preamble.
9. A method for receiving a preamble of a data unit via a multiple input, multiple output (MIMO) communication channel using a first receiver, the method comprising:
receiving a first sub-field of a first field of the preamble, wherein the first sub-field includes a first indication of a first set of a plurality of training sequences that corresponds to transmission of the data unit to the first receiver;
determining, based on the first indication, that the first set of the plurality of training sequences corresponds to the first receiver;
receiving a second field of the preamble after receiving the first field of the preamble, wherein the second field of the preamble comprises the plurality of training sequences;
receiving a third field of the preamble, wherein the third field includes a group identification indication, wherein the group identification indication indicates either (i) that the data unit corresponds to only one receiver, or (ii) an address of a group of multiple receivers including the first receiver and at least a second receiver;
when the third field indicates that the data unit corresponds to only one receiver, the second sub-field of the first field includes an indicator of the first receiver so that other receivers can determine that the data unit is not addressed to the other receivers;
when the third field indicates the address of the group of multiple receivers, the second sub-field of the first field includes a second indication of a second set of the plurality of training sequences that corresponds to transmission of the data unit to the second receiver; and
10. A method according to claim 9, wherein the first indication indicates a first number of spatial or space-time streams that corresponds to transmission of the data unit to the first receiver.
11. A method according to claim 9, wherein determining that the first set of the plurality of training sequences corresponds to the first receiver is further based on the second indication.
receiving an indication of an order in which the first indication and the second indication are transmitted in the first field of the preamble, before receiving the first field of the preamble; and
receive a first field of a preamble of a data unit via a multiple input, multiple output (MIMO) communication channel, wherein the first field includes a first sub-field and a second sub-field wherein the first sub-field includes a first indication of a first set of a plurality of training sequences that corresponds to transmission of the data unit to a first receiver, wherein the first receiver comprises the apparatus,
determine, based on the first indicator, that the first set of the plurality of training sequences corresponds to the first receiver;
receive a second field of the preamble after receiving the first field of the preamble, wherein the second field of the preamble includes the plurality of training sequences,
receive a third field of the preamble, wherein the third field includes a group identification indication that indicates either (i) that the data unit corresponds to only one receiver, or (ii) an address of a group of multiple receivers including a first receiver and at least a second receiver, wherein the apparatus comprises the first receiver, wherein
when the third field indicates that the data unit corresponds to only one receiver, the second sub-field of the first field of the preamble includes an indicator of the first receiver so that other receivers can determine that the data unit is not addressed to the other receivers;
when the second field indicates the address of the group of multiple receivers, the second sub-field of the first field of the preamble includes a second indication of a second set of the plurality of training sequences that corresponds to transmission of the data unit to a second receiver, and
utilize the first set of the plurality of training sequences to generate an estimate of at least a portion of the MIMO communication channel.
14. An apparatus according to claim 13, wherein the first indicator that indicates a first number of spatial or space-time streams that corresponds to transmission of the data unit to the first receiver.
15. An apparatus according to claim 13, wherein the PHY unit is further configured to determine that the first set of the plurality of training sequences corresponds to the first receiver further based on the second indicator that corresponds to a second one of the plurality of receivers.
16. An apparatus according to claim 13, wherein the PHY unit is further configured to:
receive an indication of an order in which the first indication and the second indication are transmitted in the first field of the preamble; and
US12/910,628 2009-10-23 2010-10-22 Training sequence indication for WLAN Active 2031-04-27 US8724546B2 (en)
US25460809P true 2009-10-23 2009-10-23
US25503809P true 2009-10-26 2009-10-26
US25958409P true 2009-11-09 2009-11-09
US26072909P true 2009-11-12 2009-11-12
US29472910P true 2010-01-13 2010-01-13
US30778010P true 2010-02-24 2010-02-24
US32139010P true 2010-04-06 2010-04-06
US12/910,628 US8724546B2 (en) 2009-10-23 2010-10-22 Training sequence indication for WLAN
US14/269,976 US9281877B2 (en) 2009-10-23 2014-05-05 Training sequence indication for WLAN
US15/063,218 US20160191127A1 (en) 2009-10-23 2016-03-07 Generating and Processing Multi-User Data Units for WLAN
US14/269,976 Continuation US9281877B2 (en) 2009-10-23 2014-05-05 Training sequence indication for WLAN
US20110096797A1 US20110096797A1 (en) 2011-04-28
US8724546B2 true US8724546B2 (en) 2014-05-13
ID=43432237
US12/910,608 Active 2031-12-05 US9294164B2 (en) 2009-10-23 2010-10-22 Number of streams indication for WLAN
US12/910,628 Active 2031-04-27 US8724546B2 (en) 2009-10-23 2010-10-22 Training sequence indication for WLAN
US14/269,976 Active US9281877B2 (en) 2009-10-23 2014-05-05 Training sequence indication for WLAN
US15/063,218 Pending US20160191127A1 (en) 2009-10-23 2016-03-07 Generating and Processing Multi-User Data Units for WLAN
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