DATA COMMUNICATION METHOD AND MOBILE COMMUNICATION SYSTEM
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Accused Products
Abstract
Since OFDM (Orthogonal Frequency Division Multiplexing), which is a downlink access scheme used for an LTE (Long Term Evolution) communication system, is weak at interference, it is preferable that the number of base stations for transmitting the same E-MBMS (Evolved Multimedia Broadcast Multicast Service) data base not excessive.
Thus, the mobile terminal performs: processing of obtaining measurement quality values by measuring reception quality of each base station; processing of deciding on whether the measurement quality value of a serving base station exceeds a certain receiving level; processing of adding measurement quality values of other base stations to the measurement quality value of the serving base station until the sum exceeds the certain receiving level; and processing of notifying the serving base station of the serving base station and other base stations as candidates for an active set for E-MBMS. This makes it possible to select as the active set for E-MBMS an appropriate number of base stations that make it compatible to maintain good reception quality and to prevent interference.
19 Citations
9 Claims
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1-7. -7. (canceled)
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8. A mobile communication system that transmits E-MBMS (Evolved Multimedia Broadcast Multicast Service) data, comprising:
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a mobile terminal, which requests entry into E-MBMS service; a serving base station which receives the request, and transmits a signal to the mobile terminal for measuring E-MBMS signal quality, wherein the signal is carried over a transport channel and is received independently from an E-MBMS data; and a plurality of additional base stations requested by the serving base station to be included in an active set of base stations transmitting E-MBMS data to the mobile terminal, wherein after the mobile terminal performs the E-MBMS quality measurement, if a second pre-determined signal quality threshold is exceeded, the mobile terminal transmits a request to drop any excess base stations from the active set.
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9. A mobile communication system that transmits E-MBMS (Evolved Multimedia Broadcast Multicast Service) data, comprising:
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a mobile terminal, said mobile terminal which requests entry into E-MBMS service; a serving base station which receives the request, and transmits a signal to the mobile terminal for measuring E-MBMS signal quality, wherein the signal is carried over a logic channel and is received independently from an E-MBMS data; and a plurality of additional base stations that are requested by the serving base station to be included in an active set of base stations transmitting E-MBMS data to the mobile terminal, wherein the active set of base stations is every neighboring base station of the serving base station.
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Specification