The present invention provides a method for producing a Group III nitride semiconductor light-emitting device wherein in the formation of a light-emitting layer by forming a well layer, a capping layer and a barrier layer, the well layer having superior flatness and crystallinity is formed while suppressing the occurrence of damage to the well layer. One embodiment comprises a method including a network detecting a mobile station entering or leaving soft handoff and responsively modifying a transmission parameter. The method and system further comprise resuming navigation according to the breadcrumb navigation trail by downloading of a web page according to navigation information of a last breadcrumb in the breadcrumb navigation trail. Some preferred reactions take place in the aqueous phase.