Mac-phy model for sidelink carrier (re)selection

A first wireless device comprising:

• a transceiver configured to provide wireless network communication with a wireless communication network using a plurality of protocol layers including a media access control, MAC, layer;
• and
• a processor coupled with the transceiver, wherein the processor is configured to provide wireless network communication through the transceiver, and wherein the processor is configured to perform operations comprising:
• at the MAC layer, selecting a plurality of carriers for carrier aggregation, each of the carriers being associated to a respective hybrid automatic repeat request, HARQ, entity;
• and
• at the MAC layer, initiating a sidelink carrier reselection process by the first communication device in response to a triggering event, the triggering event comprising at least one of:
• there is no configured sidelink grant in any sidelink carrier;
• a configured sidelink grant cannot accommodate an RLC SDU by using a maximum allowed modulation and coding scheme, MCS, configured by upper layers for any sidelink carrier with configured SL grant and the MAC entity selects not to segment the RLC SDU;
• transmission(s) with a configured sidelink grant cannot fulfil a latency requirement of data in a sidelink logical channel for any sidelink carrier with a configured sidelink grant, and the MAC selects not to perform transmission(s) corresponding to a single MAC PDU.

A method in a first communication device having a plurality of protocol layers including a media access control, MAC, layer and a physical, PHY, layer, the method comprising:

• receiving, at the MAC layer, data for transmission over a sidelink interface to a second communication device;
• generating, at the MAC layer, first and second MAC protocol data units, PDUs, from the data;
• providing the first and second MAC PDUs from the MAC layer to the PHY layer for simultaneous transmission in a first transmission time interval, TTI, along with an indication of selected first and second carriers from a set of available carriers that the PHY layer should use for transmission of the first and second MAC PDUs in a sidelink transmission to the second communication device, respectively;
• and
• receiving, at the MAC layer, an acknowledgement from the PHY layer, the acknowledgement indicating whether or not the simultaneous transmission of the first and second MAC PDUs on the selected first and second carriers was performed successfully.

A first wireless device comprising:

• a transceiver configured to provide wireless network communication with a wireless communication network using a plurality of protocol layers including a media access control, MAC, layer and a physical, PHY, layer;
• and
• a processor coupled with the transceiver, wherein the processor is configured to provide wireless network communication through the transceiver, and wherein the processor is configured to perform operations comprising:
• receiving, at the MAC layer, data for transmission over a sidelink interface to a second communication device;
• generating, at the MAC layer, first and second MAC protocol data units, PDUs, from the data;
• providing the first and second MAC PDUs from the MAC layer to the PHY layer for simultaneous transmission in a first transmission time interval, TTI, along with an indication of selected first and second carriers from a set of available carriers that the PHY layer should use for transmission of the first and second MAC PDUs in a sidelink transmission to the second communication device, respectively;
• and
• receiving, at the MAC layer, an acknowledgement from the PHY layer, the acknowledgement indicating whether or not the simultaneous transmission of the first and second MAC PDUs on the selected first and second carriers was performed successfully.

A method in a first communication device having a plurality of protocol layers including a media access control, MAC, layer and a physical, PHY, layer, the method comprising:

• receiving, at the MAC layer, data for transmission over a sidelink interface to a second communication device;
• generating, at the MAC layer, first and second MAC protocol data units, PDUs, from the data;
• receiving information from the PHY layer regarding the availability of one or more carriers for transmitting the first and second MAC PDUs;
• performing a carrier selection or reselection procedure to select first and second carriers from the one or more carriers for transmission of the first and second MAC PDUs based on the information from the PHY layer;
• and
• providing the first and second MAC PDUs from the MAC layer to the PHY layer for simultaneous transmission in a first transmission time interval, TTI, along with an indication of the selected first and second carriers.

A first wireless device comprising:

• a transceiver configured to provide wireless network communication with a wireless communication network using a plurality of protocol layers including a media access control, MAC, layer and a physical, PHY, layer;
• and
• a processor coupled with the transceiver, wherein the processor is configured to provide wireless network communication through the transceiver, and wherein the processor is configured to perform operations comprising:
• receiving, at the MAC layer, data for transmission over a sidelink interface to a second communication device;
• generating, at the MAC layer, first and second MAC protocol data units, PDUs, from the data;
• receiving information from the PHY layer regarding the availability of one or more carriers for transmitting the first and second MAC PDUs;
• performing a carrier selection or reselection procedure to select first and second carriers from the one or more carriers for transmission of the first and second MAC PDUs based on the information from the PHY layer;
• and
• providing the first and second MAC PDUs from the MAC layer to the PHY layer for simultaneous transmission in a first transmission time interval, TTI, along with an indication of the selected first and second carriers.