pMATE: A Privacy-Preserving Map Retrieval Task Assignment Scheme in Spatial Crowdsourcing

Algorithm 2

Get TWs.

	Input: Cell number of TR in the cell x, t;
	Output: // the set of TWs
	Initialize , , , , now, before, cache ← ∅;
	Initialize float R ← 0;
	Initialize  ← x. Generator Point;
	Initialize now ← x;
	While = ∅ do
	R ← Find R (now, );
	Geo-Broadcast (R);
	Wait (t);
	W ← Worker Respond();
	cache ← now;
	now ← now.Adjacency − cache − before;
	before ← cache;
	Return ;