Poster Abstract: Hierarchical Subchannel Allocation for Mode-3 Vehicle-to-Vehicle Sidelink Communications

Abstract

In V2V Mode-3, eNodeBs assign subchannels to vehicles in order for them to periodically broadcast CAM messages b2. A crucial aspect is to ensure that vehicles in the same cluster will broadcast in orthogonal time subchannelsA subchannel is a time-frequency resource chunk capable of sufficiently conveying a CAM message. to avoid conflicts. In general, resource/subchannel allocation problems can be represented as weighted bipartite graphs. However, in this scenario there is an additional time orthogonality constraint which cannot be straightforwardly handled by conventional graph matching methods b3. Thus, in our approach the mentioned constraint has been taken into account. We also perform the allocation task in a sequential manner based on the constrainedness of each cluster. To illustrate the gist of the problem, in Fig. 1 we show two partially overlapping clusters where a conflict between vehicles V_8 and V_10 is generated as the allotted subchannels are in the same subframe.

Tasks

Reproductions