Service based hight-speed railway base station arrangement

9 To provide stable and high data rate wireless access for passengers in the train, it is necessary to 10 properly deploy base stations along the railway. We consider this issue from the perspective of service, 11 which is defined as the integral of the time-varying instantaneous channel capacity. With large-scale 12 fading assumption, it will be shown that the total service of each base station is inversely proportional 13 to the velocity of the train. Besides, we find that if the ratio of the service provided by a base station 14 in its service region to its total service is given, the base station interval (i.e. the distance between 15 two adjacent base stations) is a constant regardless of the velocity of the train. On the other hand, if a 16 certain amount of service is required, the interval will increase with the velocity of the train. The above 17 results apply not only to simple curve rails, like line rail and arc rail, but also to any irregular curve 18 rail, provided that the train is travelling at a constant velocity. Furthermore, the new developed results 19 are applied to analyze the on-off transmission strategy of base stations. 20