contention slot

contention slot

(Or contention period). Minimum time a host must transmit for before it can be sure that no other host's packet has collided with its transmission. If the maximum propagation delay from one host to any other is T, then a host that starts to transmit at time t0 may collide with a host that starts just before t0 + T. The first host will not detect the collision until time t0 + 2T.
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Otherwise, the back off counter is randomized and decremented for each idle contention slot detected.
Following this, any maintenance regions are scheduled first as indicated in [1], and then the minislots that are to be used during contention access (for bandwidth request transmissions) are scheduled, using a Contention Slot Allocator (CSA).
Performance Evaluation of Adaptive Contention Slot Allocators for CATV Networks based on the European Cable Comms.
4 Mbps Minimum contention slots per UL-frame (c) 7 slots UL minislot size 16 bytes UL-frame Duration (F) ([approximately equal to] 2ms) 150 minislots Simulation time for each run 60s Distance from nearest/farthest SS to the BS 0.
In general, backoff algorithms can be characterized by three key measures: the expansion/reset factor of the contention window, the probability distribution of contention slot selection, and the update mechanism of the contention window's bounds.
Schemes in [12][13][14] and [15] use non-uniform probability distribution for contention slot selection over the optimized contention window.
Let us further assume that x [greater than or equal to] 2 number of STAs from the group select the same contention slot [j.
However, there is a slight difference in the contention slot selection process.
For example, if a STA that is in its i-th contention stage experiences a collision, while contending by selecting the contention slot j [member of] [0, [W.
Hence, it would be safe (in terms of collision avoidance) not to select any of the contention slots in the overlapped region.
In this paper, we propose a reactive BEB which deterministically nullifies the selection chances of the overlapped contention slots in the adjacent contention stages.
The CMTS divides the slots in the upstream channel into 2 categories: contention slots (CS) and data slots (DS).