Multi-link device (MLD) configured for multi-band operation using single MAC service access point (SAP)
Simultaneous dual band operation (2.4 and 5 GHz) is common in APs on the market today, and tri-band devices are expected in the market soon. Link aggregation can also be applicable to multiple air interfaces in the same band (for instance 2 independent IEEE 802.1 lac/ax air interfaces at 5 GHz on 2 different 80 MHz channels). One exemplary aspect provides technology that enables significantly higher throughput and/or higher reliability for two stations (STAs) or a STA and the access point (AP) when the devices support simultaneous multi-band operation.
1. An apparatus for a multi-link device (MLD) configured for communicating over multiple links, each of the multiple links associated with a WLAN channel, the MLD being a multi-band capable device configured for simultaneously operating over more than one of a plurality of frequency bands,
the MLD comprising:
a multi-band upper Media Access Controller (MAC) layer;
a plurality of lower MAC layers; and
a plurality of physical layers (PHYs), each PHY of the plurality associated with one of the lower MAC layers,
wherein each of the PHYs is configured for communication across one or more of the frequency bands including at least a 2.4 GHz band and a 5 GHz band,
wherein the multi-band upper MAC layer is configured to communicate with the lower MAC layers using a single MAC Service Access Point (SAP) for multi-link communication including simultaneous communication across the frequency bands,
wherein the multi-band upper MAC layer is configured to route packets from a buffer to one or more of the lower MAC layers associated with one of the links at least based on link availability for transmission by the associated PHY,
wherein the packets arrive at the single MAC SAP and are assigned multi-band sequence numbers before being placed in the buffer,
wherein each of the plurality of lower MAC layers further include an Enhanced Distributed Channel Access functional block for managing channel access,
wherein the multi-band upper MAC layer is configured to communicate with the lower MAC layers using the single MAC SAP for multi-link communication over different frequency bands,
wherein the buffer is a shared buffer,
wherein the multi-band upper MAC layer is configured to encode signalling for transmission by one of the PHYs on a first frequency band via an associated one of the lower MAC layers that is currently associated with a channel of the first frequency band,
wherein the MLD is capable of communicating over the multiple links including simultaneous operation on the plurality of frequency bands including a second frequency band, the second frequency band of a channel associated with another of the lower MAC layers, the single MAC SAP for use in multi-band communication, and
wherein each of the lower MAC layers is configurable for communicating over two or more of the links using different WLAN channels within one of the frequency bands.
2. The apparatus of claim 1 , further comprising processing circuitry configured to implement operations performed by the multi-band upper MAC layer and the plurality of lower MAC layers.
3. The apparatus of claim 2 , further comprising transceiver circuitry configured to implement the PHYS.
4. The apparatus of claim 3 , further comprising memory to store instructions for execution by the processing circuitry.
5. A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of a multi-link device (MLD) configured for communicating over multiple links, the MLD being a multi-band capable device configured for simultaneously operating over more than one of a plurality of frequency bands, wherein the MLD comprises:
a multi-band upper Media Access Controller (MAC) layer configured by the processing circuitry;
a plurality of lower MAC layers configured by the processing circuitry; and
a plurality of physical layers (PHYs), each PHY of the plurality associated with one of the lower MAC layers,
wherein each of the PHYs is configured for communication across one or more of the frequency bands including at least a 2.4 GHz band and a 5 GHz band,
wherein the processing circuitry configures the multi-band upper MAC layer to communicate with the lower MAC layers using a single MAC Service Access Point (SAP) for multi-link communication including simultaneous communication across the frequency bands, and
wherein the processing circuitry configures the multi-band upper MAC layer is configured to route packets from a buffer to one or more of the lower MAC layers associated with one of the links at least based on link availability for transmission by the associated PHY,
wherein the packets arrive at the single MAC SAP and are assigned multi-band sequence numbers before being placed in the buffer,
wherein each of the plurality of lower MAC layers further include an Enhanced Distributed Channel Access functional block for managing channel access,
wherein the multi-band upper MAC layer is configured to communicate with the lower MAC layers using the single MAC SAP for multi-link communication over different frequency bands,
wherein the buffer is a shared buffer,
wherein the multi-band upper MAC layer is configured to encode signalling for transmission by one of the PHYs on a first frequency band via an associated one of the lower MAC layers that is currently associated with a channel of the first frequency band,
wherein the MLD is capable of communicating over the multiple links including simultaneous operation on the plurality of frequency bands including a second frequency band, the second frequency band of a channel associated with another of the lower MAC layers, the single MAC SAP for use in multi-band communication, and
wherein each of the lower MAC layers is configurable for communicating over two or more of the links using different WLAN channels within one of the frequency bands.
6. A method for communicating over multiple links performed by multi-link device (MLD), the MLD being a multi-band capable device configured for simultaneously operating over more than one of a plurality of frequency bands, wherein the MLD comprises
a multi-band upper Media Access Controller (MAC) layer;
a plurality of lower MAC layers; and
a plurality of physical layers (PHYs), each PHY of the plurality associated with one of the lower MAC layers,
the method comprising:
configuring each of the PHYs for communication across one or more of the frequency bands including at least a 2.4 GHz band and a 5 GHz band;
configuring the multi-band upper MAC layer to communicate with the lower MAC layers using a single MAC Service Access Point (SAP) for multi-link communication including simultaneous communication across the frequency bands; and
configuring the multi-band upper MAC layer to route packets from a buffer to one or more of the lower MAC layers associated with one of the links at least based on link availability for transmission by the associated PHY,
wherein the packets arrive at the single MAC SAP and are assigned multi-band sequence numbers before being placed in the buffer,
wherein each of the plurality of lower MAC layers further include an Enhanced Distributed Channel Access functional block for managing channel access,
wherein the multi-band upper MAC layer is configured to communicate with the lower MAC layers using the single MAC SAP for multi-link communication over different frequency bands,
wherein the buffer is a shared buffer,
wherein the multi-band upper MAC layer is configured to encode signalling for transmission by one of the PHYs on a first frequency band via an associated one of the lower MAC layers that is currently associated with a channel of the first frequency band,
wherein the MLD is capable of communicating over the multiple links including simultaneous operation on the plurality of frequency bands including a second frequency band, the second frequency band of a channel associated with another of the lower MAC layers, the single MAC SAP for use in multi-band communication, and
wherein each of the lower MAC layers is configurable for communicating over two or more of the links using different WLAN channels within one of the frequency bands.