Aggregated HE control content in A-MPDU
An Access Point (AP) in a Wireless Local Area Network (WLAN) is configured to provide a first Media Access Control (MAC) Protocol Data Unit (MPDU) in a downlink frame, the first MPDU being addressed to a first set of stations and the first MPDU includes first trigger information for scheduling an uplink transmission, provide a second MPDU in the downlink frame, the second MPDU being addressed to a second set of stations and the second MPDU includes second trigger information to schedule the uplink transmission and the second trigger information includes a second set of values that are set to be the same as a first set of values in the first trigger information, the second set of values that are set to be the same as the first set of values includes a value indicative of a combination of guard interval and long training field (LTF) for the uplink transmission, and transmit the downlink frame to the first and second set of stations.
1 . An Access Point (AP) in a Wireless Local Area Network (WLAN), comprising:
a processor; and
one or more memories, coupled to the processor, the one or more memories include instructions, which when executed by the processor cause the AP to:
provide a first Media Access Control (MAC) Protocol Data Unit (MPDU) in a downlink frame, the first MPDU being addressed to a first set of stations and the first MPDU includes first trigger information for scheduling an uplink transmission;
provide a second MPDU in the downlink frame, the second MPDU being addressed to a second set of stations and the second MPDU includes second trigger information to schedule the uplink transmission and the second trigger information includes a second set of values that are set to be the same as a first set of values in the first trigger information,
the second set of values that are set to be the same as the first set of values includes a value indicative of a combination of guard interval and long training field (LTF) for the uplink transmission; and
transmit the downlink frame to the first and second set of stations.
2 . The AP of claim 1 , wherein the first MPDU includes a first trigger frame and the first trigger information is located within the first trigger frame, wherein the first trigger information includes one or more common information fields which are targeted at each station in the first set of stations addressed by the first MPDU for use in the uplink transmission, and one or more sets of station specific fields, wherein each set of station specific fields are targeted at a single station in the first set of stations for use in the uplink transmission.
3 . The AP of claim 2 , wherein the second MPDU includes a second trigger frame and the second trigger information is located within the second trigger frame,
wherein the second trigger information includes one or more common information fields, which are targeted at each station in the second set of stations addressed by the second MPDU for use in the uplink transmission, and one or more sets of station specific fields, wherein each set of station specific fields are targeted at a single station in the second set of stations for use in the uplink transmission,
wherein the first set of values are in the one or more common information fields in the first trigger information and the second set of values are in the one or more common information fields in the second trigger information.
4 . The AP of claim 3 , wherein the one or more common information fields in the first trigger information includes a first trigger type field, which indicates a response type requested by the AP using the first trigger information, and first trigger dependent information, which indicates settings for the response type indicated by the first trigger type field, and the one or more common information fields in the second trigger information includes a second trigger type field, which indicates a response type requested by the AP using the second trigger information, and second trigger dependent information, which indicates settings for the response type indicated by the second trigger type field, wherein the first trigger type field and the second trigger type field are distinct.
5 . The AP of claim 3 , wherein the one or more common information fields in the first trigger information and the one or more common information fields in the second trigger information each include (1) a length field, which indicates a length of the uplink transmission, (2) a bandwidth field, which indicates a bandwidth of the uplink transmission, (3) a guard interval and long training field (LTF) field, which describes the combination of guard interval and LTF for the uplink transmission, (4) a spatial reuse field, which indicates whether spatial reuse is permitted during transmission of the uplink transmission, and (5) a signaling reserved field, which indicates settings for reserved bits in the uplink transmission.
6 . The AP of claim 5 , wherein the first set of values correspond to the length field, the bandwidth field, the guard interval and LTF field, the spatial reuse field, and the signaling reserved field in the first trigger information, and wherein the second set of values correspond to the length field, the bandwidth field, the guard interval and LTF field, the spatial reuse field, and the signaling reserved field in the second trigger information.
7 . The AP of claim 2 , wherein in response to the second trigger information is located in a MAC header of the second MPDU, the AP is further configured to:
set a multi-user multiple-input-multiple-output long training mode field in the one or more common information fields of the first trigger information to indicate use of single stream pilot tones for the uplink transmission;
set a space time block coding (STBC) field in the one or more common information fields of the first trigger information to indicate that STBC is not to be utilized for the uplink transmission;
set a number of high-efficiency long training field (LTF) symbols field in the one or more common information fields of the first trigger information to indicate that a single LTF symbol is used in the uplink transmission;
set a spatial reuse field in the one or more common information fields of the first trigger information to indicate that spatial reuse is disallowed during the uplink transmission;
set a guard interval and LTF Type field in the one or more common information fields of the first trigger information to indicate use of 4×LTF sequence and a 3.2 μs cyclic prefix in the uplink transmission when the downlink frame uses a 4×LTF sequence and a 3.2 μs cyclic prefix or when the downlink frame uses a 2×LTF sequence and a 1.6 μs cyclic prefix; and
set the guard interval and LTF Type field in the one or more common information fields of the first trigger information to indicate use of 2×LTF sequence and a 1.6 μs cyclic prefix in the uplink transmission when the downlink frame does not use a 4×LTF sequence and a 3.2 μs cyclic prefix or a 2×LTF sequence and a 1.6 μs cyclic prefix.
8 . The AP of claim 1 , wherein the first trigger information is located in a MAC header of the first MPDU and the second trigger information is located in a MAC header of the second MPDU, the AP is further configured to:
set a length field in the first set of values to the same value as a length field in the second set of values, wherein the length field in the first set of values and the length field in the second set of values indicate the length of the uplink transmission; and
set a downlink transmission power field in the first set of values to the same value as a downlink transmission power field in the second set of values, wherein the downlink transmission power field in the first set of values and the downlink transmission power field in the second set of values indicate the transmission power of the AP during transmission of the downlink frame.
9 . An Access Point (AP) in a Wireless Local Area Network (WLAN) that generates and transmits a Media Access Control (MAC) Protocol Data Unit (MPDU), comprising:
a processor; and
one or more memories, coupled to the processor, the one or more memories include instructions, which when executed by the processor cause the AP to:
generate a first MPDU, wherein a MAC header of the first MPDU includes a first High Efficiency Aggregated Control (HE A-Control) field;
determine to include a group address as a receiver address in the first MPDU such that the first MPDU is addressed to stations referenced by the group address, wherein a High Efficiency Control Unicast Trigger Frame (HEC-UTR) subfield which would carry uplink multi-user response scheduling information, is excluded from the HE A-Control field of the first MPDU in response to the AP determines that the first MPDU includes the group address as the receiver address; and
transmit the first MPDU through a wireless medium.
10 . The AP of claim 9 , wherein the first MPDU includes in the HE A-Control field one or more of (1) an operating mode indication subfield that carries information regarding a change in receiver operation, (2) quality of service control subfield that carries information for requesting or providing a buffer status report, (3) power control subfield that carries information for requesting or confirming a power adjustment, and (4) channel quality information control subfield that carries information regarding channel quality, including a recommend number of spatial streams and a recommended modulation and coding scheme.
11 . The AP of claim 9 , further configured to:
generate a second MPDU, wherein the first MPDU and a second MPDU are included in an Aggregated MPDU (A-MPDU), wherein the A-MPDU includes either a HEC-UTR subfield or a trigger frame.
12 . An Access Point (AP) in a Wireless Local Area Network (WLAN) that generates and transmits an Aggregated Media Access Control (MAC) Protocol Data Unit (A-MPDU) that elicits an uplink (UL) multi-user (MU) response, comprising:
a processor; and
one or more memories, coupled to the processor, the one or more memories include instructions, which when executed by the processor cause the AP to:
generate an A-MPDU according to a set of rules, the set of rules including a first rule that a trigger frame is not included in a MAC Protocol Data Unit (MPDU) of the A-MPDU in response to a High Efficiency Control Unicast Trigger Frame (HEC-UTR) subfield is included in a High Efficiency Aggregated Control (HE A-Control) field of an MPDU within the A-MPDU; and
transmit the A-MPDU as a downlink transmission through a wireless medium.
13 . The AP of claim 12 , wherein the set of rules includes a second rule that multiple trigger frames included in the downlink transmission carry identical scheduling information.
14 . The AP of claim 13 , wherein the scheduling information includes (1) a length field, which indicates a length of the UL MU response, (2) a bandwidth field, which indicates a bandwidth of the UL MU response, (3) a guard interval and long training field (LTF) field, which describes a combination of guard interval and LTF for the UL MU response, (4) a spatial reuse field, which indicates whether spatial reuse is permitted during transmission of the UL MU response, and (5) a signaling reserved field, which indicates settings for reserved bits in the UL MU response.
15 . The AP of claim 13 , wherein the set of rules includes a third rule that a trigger type field and a trigger type-dependent field are distinct between the multiple trigger frames within the downlink transmission.
16 . The AP of claim 12 , wherein the set of rules includes a second rule that an MPDU in the A-MPDU cannot be addressed to a groupcast address when that MPDU includes an HEC-UTR subfield in an HE A-Control field.
17 . The AP of claim 12 , wherein the downlink transmission includes a first MPDU that includes a first trigger frame that carries first trigger information, wherein the first trigger information includes one or more common information fields, which are targeted at each station in a first set of stations addressed by the first MPDU for use in the UL MU response, and one or more sets of station specific fields, wherein each set of station specific fields are targeted at a single station in the first set of stations for use in the UL MU response.
18 . The AP of claim 17 , wherein the downlink transmission includes a second MPDU that includes a second trigger frame that carries second trigger information, wherein the second trigger information includes one or more common information fields which are targeted at each station in a second set of stations addressed by the second MPDU for use in the UL MU response, and one or more sets of station specific fields, wherein each set of station specific fields are targeted at a single station in the second set of stations for use in the UL MU response.
19 . The AP of claim 17 , wherein the downlink transmission includes a second MPDU, wherein a MAC header of the second MPDU carries second trigger information, the AP is further configured to:
set a multi-user multiple-input-multiple-output long training mode field in the one or more common information fields of the first trigger information to indicate use of single stream pilot tones for the UL MU response;
set a space time block coding (STBC) field in the one or more common information fields of the first trigger information to indicate that STBC is not to be utilized for the UL MU response;
set a number of high-efficiency long training field (LTF) symbols field in the one or more common information fields of the first trigger information to indicate that a single LTF symbol is used in the UL MU response;
set a spatial reuse field in the one or more common information fields of the first trigger information to indicate that spatial reuse is disallowed during the UL MU response;
set a guard interval and LTF Type field in the one or more common information fields of the first trigger information to indicate use of 4×LTF sequence and a 3.2 μs cyclic prefix in the UL MU response when a downlink frame uses a 4×LTF sequence and a 3.2 μs cyclic prefix or when the downlink frame uses a 2×LTF sequence and a 1.6 μs cyclic prefix; and
set the guard interval and LTF Type field in the one or more common information fields of the first trigger information to indicate use of 2×LTF sequence and a 1.6 μs cyclic prefix in the UL MU response when a downlink frame does not use a 4×LTF sequence and a 3.2 μs cyclic prefix or a 2×LTF sequence and a 1.6 μs cyclic prefix.
20 . The AP of claim 12 , wherein the downlink transmission includes a first MPDU addressed to a first set of stations (STAs) and a second MPDU addressed to a second set of STAs, wherein a MAC header of the first MPDU includes first trigger information for scheduling the UL MU response and a MAC header of the second MPDU includes second trigger information for scheduling the UL MU response, the AP is further configured to:
set a length field in the first trigger information to the same value as a length field in the second trigger information, wherein the length field in the first trigger information and the length field in the second trigger information indicate the length of the UL MU response; and
set a downlink transmission power field in the first trigger information to the same value as a downlink transmission power field in the second trigger information, wherein the downlink transmission power field in the first trigger information and the downlink transmission power field in the second trigger information indicate the transmission power of the AP during the downlink transmission.