Apparatus and method for multi-link management in multi-link communication systems
Embodiments of an apparatus and method are disclosed. In an embodiment, a method of executing multi-link operations in a multi-link communications system comprises performing a single frame exchange between a first multi-link device and a second multi-link device to execute a multi-link operation for multiple links between the first and second multi-link devices using a frame transmitted on a first link among the multiple links, wherein the frame includes an element that carries other link information on at least one link of the multiple links other than the first link, wherein the frame includes per-link value information that has different values for different links of the multiple link, and wherein successful execution of the single frame exchange completes the multi-link operation for at least two links of the multiple links between the first and second multi-link devices.
1. A method of executing multi-link operations in a multi-link communications system, the method comprising:
performing a single frame exchange between a first multi-link device and a second multi-link device to execute a multi-link operation for multiple links between the first and second multi-link devices using a frame transmitted on a first link among the multiple links,
wherein the frame includes an element that carries other link information on each of the multiple links other than the first link that are involved in the multi-link operation,
wherein the frame includes per-link value information that has different values for different links of the multiple link, the per-link value information including information that cannot be carried in any subelements of Per Station (STA) Profile element, and
wherein successful execution of the single frame exchange completes the multi-link operation for at least two links of the multiple links between the first and second multi-link devices.
2. The method of claim 1 , wherein the other link information carried in the element includes link identifier of the at least one link of the multiple links other than the first link.
3. The method of claim 2 , wherein the element is an extensible element and wherein the other link information is carried in at least one added field or subelement of the element.
4. The method of claim 2 , wherein the element is a Per STA Profile element that includes the other link information.
5. The method of claim 4 , wherein the Per STA Profile element includes multiple subelements and fields before the multiple subelements.
6. The method of claim 4 , wherein the Per STA Profile element has a particular format among different formats based on different values in a type field.
7. The method of claim 4 , wherein the Per STA Profile element includes a type field that identifies one of different formats for the Per STA Profile element.
8. The method of claim 1 , wherein the multi-link operation is a key negotiation of a fast basic service set (BSS) transition.
9. The method of claim 8 , wherein the key negotiation is based on a key hierarchy for fast BSS transition.
10. The method of claim 8 , wherein the key negotiation includes a pairwise transient key (PTK) negotiation based on a non-access point's media access control (MAC) service access point (SAP) address, a MAC SAP address of a current associated access point (AP) multi-link device and a MAC SAP address of a transmitting AP MLD.
11. The method of claim 1 , wherein the single frame exchange excludes frame exchanges involving management frames of sounding, fast session transfer (FST) and public action.
12. A multi-link communications system comprising:
a first multi-link device;
a second multi-link device; and
a plurality of links connecting the first and second multi-link devices,
wherein the first and second multi-link devices are programmed to perform a single frame exchange to execute a multi-link operation for multiple links between the first and second multi-link devices using a frame transmitted on a first link among the multiple links,
wherein the frame includes an element that carries other link information on each of the multiple links other than the first link that are involved in the multi-link operation,
wherein the frame includes per-link value information that has different values for different links of the multiple link, the per-link value information including information that cannot be carried in any subelements of Per STA Profile element, and
wherein successful execution of the single frame exchange completes the multi-link operation for at least two links of the multiple links between the first and second multi-link devices.
13. The multi-link communications system of claim 12 , wherein the other link information carried in the element includes link identifier of the at least one link of the multiple links other than the first link.
14. The multi-link communications system of claim 13 , wherein the element is an extensible element and wherein the other link information is carried in at least one added field or subelement of the element.
15. The multi-link communications system of claim 12 , wherein the element is a Per STA Profile element that includes the other link information.
16. The multi-link communications system of claim 15 , wherein the Per STA Profile element has a particular format among different formats based on a management frame that carriers the Per STAT Profile element or wherein the Per STA Profile element includes a type field that identifies one of the different formats for the Per STA Profile element.
17. The multi-link communications system of claim 12 , wherein the multi-link operation is a key negotiation of a fast basic service set (BSS) transition.
18. A multi-link device of a multi-link communications system, the multi-link device comprising:
a processor configured to:
perform a single frame exchange with another multi-link device of the multi-link communications system to execute a multi-link operation for multiple links between the multi-link device and the another multi-link device using a frame transmitted on a first link among the multiple links,
wherein the frame includes an element that carries other link information on each of the multiple links other than the first link that are involved in the multi-link operation,
wherein the frame includes per-link value information that has different values for different links of the multiple link, the per-link value information including information that cannot be carried in any subelements of Per STA Profile element, and
wherein successful execution of the single frame exchange completes the multi-link operation for at least two links of the multiple links between the multi-link device and the another multi-link device.
19. The multi-link device of claim 18 , wherein the other link information carried in the element includes link identifier of the at least one link of the multiple links other than the first link.
20. The multi-link device of claim 19 , wherein the element is a Per STA Profile element that includes the other link information, and wherein the Per STA Profile element has a particular format among different formats based on a management frame that carriers the Per STAT Profile element or wherein the Per STA Profile element includes a type field that identifies one of the different formats for the Per STA Profile element.