The case is that a vehicle needs to know the position of, let us say, other stationery ( I know it is strange, VANETs and Stationary doesn't usually fit but that is the case) On Board Units (OBUs). To do that it geocast a query message and because it can't reach all the OBUs in the Geo region the message must be forwarded by near OBUs to further ones. Finally all the OBUs which received the message will return their position to the query initiator directly or to the direct message sender and so forth to reach the query initiator. As the the OBUs are stationary, the challenges ( fast connection, ... ) that face typical protocols doesn't exist here. What existing protocols built over the WAVE 802.11p MAC can be utilized to achieve that?
It is very unlikely one protocol would be developed for such a specific use case. As you say, a little bit out of scope. You should consider a *proactive* protocol (rather than a reactive), meaning a protocol with routing tables. OLSR is a good example but is not meant for WAVE.
And I believe you mean 802.11p, no?
The Best networking protocol for vehicles are stationary is:
In standards for VANET (Safety applications) WSMP(Wave Short Message Protocol) is defined.
For Non safety application generally prefer IPv6
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