Patent ID: 8665771
Filing Date: 2014-03-04
Classification: H04B

Abstract:
1. A communication method of a satellite mobile communication system, comprising: receiving, by first user equipment from a base station, system information indicating a first time slot in which the first user equipment using a satellite radio interface in commonality with a terrestrial radio interface does not perform communications with the base station; accessing the base station by the first user equipment in a second time slot different from the first time slot indicated by the received system information; receiving the system information from the base station by second user equipment using a satellite radio interface optimized for a satellite environment; and accessing the base station by the second user equipment in the first time slot indicated by the received system information; further comprising allocating multimedia broadcast and multicast service single frequency network (MBSFN) subframes to a frame for a third generation partnership project (3GPP) long term evolution (LTE) radio interface by the base station, so that the second user equipment simultaneously supports the 3GPP LTE radio interface, wherein the terrestrial radio interface includes the 3GPP LTE radio interface, wherein the allocating of the MBSFN subframes includes: calculating, by the base station, a first system capacity including a transmission amount or a number of users of the first user equipment and a second system capacity including a transmission amount or a number of users of the second user equipment; and determining a number of MBSFN subframes according to a ratio of the calculated first system capacity of the first user equipment to the calculated second system capacity of the second user equipment, and allocating the MBSFN subframes according to the determined number, wherein the base station uses only a common reference signal (CRS) of subframes of number 0 and 5 for paging, and increases a number of MBSFN subframes other than the subframes of number 0 and 5 so as to be flexibly transited from the satellite radio interface in commonality with the terrestrial radio interface to the satellite radio interface optimized for the satellite environment, wherein the base station adds to a MBSFN subframe structure that is not present in the 3GPP LTE radio interface to the satellite radio interface in commonality with the 3GPP LTE radio interface, and reduces a signaling overhead including the CRS or a control channel for the first user equipment; wherein the base station allocates all frames through the system information without considering limitations for subframes of number 0, 4, 5, and 9 to be forcibly transmitted to the first and second user equipments as unicasting subframes for RPM measurement and paging.