Patent ID: 6532219
Filing Date: 2003-03-11
Classification: H04B

Abstract:
A mobile satellite communication system comprising:a plurality of mobile stations; and a base station apparatus connected to said plurality of mobile stations through a communication satellite, for performing transmission to said plurality of mobile stations using a single downward control channel and reception from said plurality of mobile stations using a single upward control channel, and wherein said plurality of mobile stations are requesting mobile stations that perform short burst transmissions on the upward control channel requesting a number of long burst transmissions, and wherein said base station apparatus comprises: a partial echo (PE) signal buffer that stores an identifier for each of said requesting mobile stations when said requesting mobile stations request long burst transmissions, said identifier being contained in a PE signal; a PE signal transmission count buffer that stores said number of long burst transmissions as a transmission count related to each of said requesting mobile stations; a transmission reservation count storing buffer that stores a number of said requesting mobile stations as a transmission reservation count, said transmission reservation count being updated in response to said short burst transmissions requesting long burst transmissions; and a control unit that transmits a collision control signal to the plurality of mobile stations in the downward control channel including said PE signal based on a maximum allowable transmission reservation count and said transmission reservation count in response to said short burst transmissions requesting long burst transmissions.