vertical scrolling - what is the technique of moving straight background tileSprite in phaser -

this code tilling background top bottom. however, tilling background straight camera view. technique need use achieving it?

preload: function() {     this.game.load.image('road', 'assets/images/road.png'); }, create: function() {     this.game.world.setbounds(0, 0, 1136, 640);     this.road = this.game.add.tilesprite(this.game.world.centerx, this.game.world.centery,    this.game.width, this.game.height, 'road');     this.road.anchor.setto(0.5);  }, update: function() {     this.road.tileposition.y +=1; } 

here example of tilling background have found in game http://www.nickjr.com/paw-patrol/games/paw-pups-save-the-day/.

background image tile

can give me clue so? thanks!

i not sure tiling sprite correct way this, may better using standard sprite sheet animation.

i used method game here: http://www.nicktoons.co.uk/microsite/dribbletricks/3fo5mu

the sprite sheet

so sprite animation set loop. here, background symmetrical duplicated sprite , rhs of pitch scaled x value -1 sprite sheet/file sizes smaller allowing more frames.