Data transmission method in wireless mesh network and A-MSDU format
Provided are a method for transmitting data in wireless mesh networks and A-MSDU format for the method. In the method, in case the receiving MPs of all of the plural MSDUs to be transmitted are identical, a transmitting MP generates an A-MSDU using the plural MSDUs and transmits the A-MSDU to the receiving MP. The A-MSDU includes a plurality of A-MSDU sub-frames each of which includes a sub-frame header unit, an MSDU unit for containing data of each of the plural MSDU, and a padding unit for making each A-MSDU sub-frame a multiple of 4 octets in length. The sub-frame header unit comprises a mesh DA field for specifying an MAC address of the destination MP of the data contained in the MSDU unit, a mesh SA field for specifying an MAC address of the source MP of the data contained in the MSDU unit, and a mesh header field for containing information of the mesh header of each of the plural MSDUs.
1. A method of transmitting data in a wireless mesh network, the method comprising:
establishing a mesh peer link with a mesh point (MP);
generating an aggregate-medium access control service data unit (A-MSDU) including a plurality of A-MSDU sub-frames; and
transmitting the A-MSDU to the MP through the mesh peer link,
wherein each of the plurality of A-MSDU sub-frames comprises a sub-frame header unit, an MSDU unit containing mesh data, and a padding unit for making each of the plurality of A-MSDU sub-frames a multiple of 4 octets in length,
wherein the sub-frame header unit comprises a mesh destination address (DA) field containing a medium access control (MAC) address of a destination MP of the mesh data contained in the MSDU unit, a mesh source address (SA) field containing a MAC address of a source MP of the mesh data contained in the MSDU unit, and a mesh header field,
wherein the mesh header field comprises a mesh flags subfield, a mesh time-to-live (TTL) subfield, a sequence number field and an address extension subfield, the mesh flags subfield including an address extension mode subfield indicating contents of the address extension subfield, the mesh TTL subfield indicating a remaining number of hops that the corresponding A-MSDU sub-frame is forwarded, the sequence number field being used for filtering duplicate reception of the corresponding A-MSDU sub-frame, and the address extension subfield is for a mesh address extension of the corresponding A-MSDU sub-frame, and wherein the mesh DA field, the mesh SA field, the mesh flags subfield, the mesh TTL subfield, the sequence number field and the address extension subfield are configured sequentially in the subframe header unit.
2. The method according to claim 1 , wherein establishing the mesh peer link comprises:
transmitting a first peer link open frame regarding the mesh peer link to the MP, the first peer link open frame including high throughput capabilities information;
receiving a first peer link confirm frame regarding the mesh peer link from the MP in response to the first peer link open frame; and
transmitting a second peer link confirm frame regarding the mesh peer link to the MP in response to a second peer link open frame received from the MP, the second peer link confirm frame including high throughput capabilities information.
3. The method according to claim 2 , wherein each of the first peer link open frame and the second peer link confirm frame further include high throughput operation information.
4. The method according to claim 3 , wherein each of the first peer link open frame and the second peer link confirm frame further include extended capabilities information and 20/40 Basic Service Set (BSS) coexistence information.
5. The method according to claim 4 , wherein:
the extended capabilities information is included in the first peer link open frame when the 20/40 BSS coexistence information is included in the first peer link open frame; and
the extended capabilities information is included in the second peer link confirm frame when the 20/40 BSS coexistence information is included in the second peer link confirm frame.
6. The method according to claim 2 , wherein each of the second peer link open frame and the first peer link confirm frame include high throughput capabilities information and high throughput operation information.
7. The method according to claim 6 , wherein each of the second peer link open frame and the first peer link confirm frame further include extended capabilities information and 20/40 Basic Service Set (BSS) coexistence information.
8. The method according to claim 2 , further comprising performing a passive scanning procedure or an active scanning procedure to discover the MP before transmitting the first peer link open frame.