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This results in many challenges at the link layer, which cannot be easily addressed with existing Medium Access Control MACC) protocols.
Then, it provides fast dissemination of geocast messages through a combination of contention-free and contention-based forwarding mechanisms at the link layer.
At the link layer, a link adaptation algorithm is implemented to select an appropriate data transmission rate based on the receiving signal-to-noise ratio.
It operates at the link layer allowing the device to be transparently inserted inline between a network node and the rest of a network.
The latest data-over-cable service interface specification (DOCSIS 3.0) for hybrid fiber coax networks defines a mechanism for channel bonding at the link layer.
This article also presents a novel method of network virtualisation at the link layer, the L2PNV approach, which ensures scalability by aggregating MAC addresses.
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Switching generally refers to choosing among several local endpoints connected to the switch at Layer 2, the link layer; however, it is also used to describe selection based on Layer 4-7 (throughrt through application layer) information.
We consider the time to be slotted, and the link layer at each sender node attempts to transmit with a probability of 0.2 in every slot.
It jointly optimizes the source coding at the application layer, allowable retransmission at the data link layer, and adaptive modulation and coding at the physical layer within a rate-distortion theoretical framework.
Along with ELN, the proposed scheme sends a new information, that is, Explicit Retransmission Start Notification (ERSN), which notifies the TCP sender of the start of the retransmission process at the wireless link layer, in order to prevent spurious timeouts at the TCP sender.
Application of the ARQ protocol at the data link layer facilitates retransmission of the erroneous packets received at the secondary receiver.
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