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I have been reading on 802.11p vs C-V2x, the two technologies for vehicular communications. One disadvantage for C-V2x that is frequently mentioned is that C-V2x needs all the UEs to be time-synced which may not be possible in out-of-coverage areas.

My question is why doesn't 802.11 based technologies need the same time sync ? C-V2x is based on LTE and time-sync is needed for resource scheduling.

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802.11 is generally a collision detection/avoidance system with uncoordinated stations.

It simply sacrifices rate by depending on "silent stretches" to coordinate medium access, and by requiring a significant amount of synchronization data to be inserted in the frame.

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  • \$\begingroup\$ so in LTE, is it correct to say that there is no concept of collisions as everything is scheduled ? \$\endgroup\$ – user3656142 Jan 26 '19 at 3:15

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