MAC/PHY interface of wireless stations compliant to direct link and downlink transmissions in trigger-based multi-user transmissions
Aspects of the present disclosure generally relate to enhanced multi-user (MU) uplink (UL) protocols in wireless networks that allow non-UL transmissions to be performed simultaneously with triggered MU UL transmissions. A station may send a trigger frame triggering MU transmissions with an appropriate signaling to allow non-UL transmissions, i.e. transmission to another station, in a resource unit of the MU transmission. Examples of non-UL transmissions include Direct Link transmissions as well as downlink (DL) transmissions. The present disclosure regards how the MAC/PHY interface at an AP and at non-AP stations can be modified to efficiently handle the DiL and DL transmissions. On one hand, a non-AP station recipient of DiL or DL transmissions can use an 802.11ax TRIGVECTOR to efficiently configure its PHY. On the other hand, the AP can configure its PHY to filter out the DiL/DL RUs.
1. A method for wireless communication, at a Medium Access Control (MAC) layer of a triggered station as a first non-Access Point (AP) station, comprising:
receiving a trigger frame from a triggering station as an AP, wherein the trigger frame triggers a multi-user (MU) transmission, wherein the trigger frame defines a plurality of resource units splitting a communication channel of the MU transmission and the trigger frame allocates a resource unit of the plurality of resource units of the MU transmission, wherein the resource unit is allocated to perform a direct data transmission from a second non-AP station towards the triggered station as the first non-AP station; and
responsive to the trigger frame, performing a configuration of a Physical (PHY) layer of the triggered station in a receive state to receive one or more data units over the resource unit allocated by the triggered frame,
wherein the MAClayer signals the resource unit, allocated by the trigger frame, in a parameter set to configure the PHY layer to filter the resource unit signaled by the MAC layer,
wherein, in said configuration of the PHY layer the MAC layer delivers, to the PHY layer, the parameter set via an interface between the PHY layer and the MAC layer,
wherein the parameter set provides the PHY layer with information needed to perform filtering and demodulating, and
wherein the PHY layer performs i) filtering of the resource unit signaled by the MAC layer, and ii) demodulating of data units received onto the resource unit signaled by the MAC layer, while non-allocated resource unit of the plurality of resource units is not signaled in the parameter set.
2. The method of claim 1 , further comprising, at the triggered station, receiving a data frame over the resource unit allocated by the trigger frame.
3. The method of claim 1 , further comprising, at the MAC layer prior to configuring the PHY layer, determining from the trigger frame whether a resource unit of the MU transmission is allocated for data transmission towards the triggered station.
4. The method of claim 1 , wherein configuring the PHY layer includes a frequency filtering of only resource unit or units allocated for data transmission towards the triggered station.
5. The method of claim 1 , wherein, the interface between the PHY layer and the MAC layer is a TRIGVECTOR vector according to IEEE802.11 standard series.
6. The method of claim 5 , wherein, the parameter set delivered via the TRIGVECTOR vector further comprises an AID12_LIST list according to IEEE802.11 standard series, which list comprises only an unused station identifier not assigned to a station by an access point.
7. A triggered station as a non-Access Point (AP) station in a wireless network comprising a microprocessor implementing a Medium Access Control (MAC) layer and being configured for carrying out the steps of:
receiving a trigger frame from a triggering station as an AP, wherein the trigger frame triggers a multi-user (MU) transmission, wherein the trigger frame defines a plurality of resource units splitting a communication channel of the MU transmission and the trigger frame allocates a resource unit from the plurality of resource units of the MU transmission, wherein the resource unit is allocated to perform a direct data transmission from a second non AP station towards the triggered station as the first non AP station; and
responsive to the trigger frame, performing a configuration of a Physical (PHY) layer of the triggered station in a receive state to receive one or more data units over the resource unit allocated by the trigger frame,
wherein the MAClayer signals the resource unit, allocated by the trigger frame in a parameter set to configure the PHY layer to filter the resource unit signaled by the MAC layer,
wherein, in said configuration of the PHY layer, the MAC layer delivers, to the PHY layer, the parameter set via an interface between the PHY layer and the MAC layer,
wherein the parameter set provides the PHY layer with information needed to perform filtering and demodulating, and
wherein, the PHY layer performs i) filtering of the resource unit signaled by the MAC layer, and ii) demodulating of data units received onto the resource unit signaled by the MAC layer, while non-allocated resource unit of the plurality of resource units is not signaled in the parameter set.
8. A non-transitory computer-readable medium storing a program which, when executed by a microprocessor or computer system in a device, causes the device to perform the method of claim 1 .