Scruton writes that this is a variation of Isolde's Impatience, only because of its scalar contour.

Motive Labels
“Ungeduld” or “Impatience” – (Pfohl, p. 220)
“Motiv des verlangenden Wiedersehens” or “Motive of Demanding to See Once Again” – (Windsperger, p. 46)

Impatience – Order of occurrence by Act and Scene
Act III: Scene 1