Rendering multicast service with sufficient reception quality to wireless terminals
First Claim
1. A method of delivering multicast service from an information delivery apparatus to wireless terminals that are experiencing different reception conditions within a service area, comprising the steps of:
- transmitting, from the information delivery apparatus, a plurality of identical sets of multicast information under respective different transmission conditions that correspond to the different reception conditions of the wireless terminals; and
receiving, at any given one of the wireless terminals, one of the identical sets of multicast information being transmitted under the respective different transmission conditions, said one of the identical sets being transmitted under one of the different transmission conditions and being received by use of said one of the different transmission conditions that is selected based on the reception quality measured at said given one of the wireless terminals.
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Abstract
The method of invention provides a multicast service from an information delivery apparatus to wireless terminals through wireless routes. The method includes the step of transmitting, from the information delivery apparatus, a plurality of sets of multicast information, wherein these sets are identical to each other as to contents thereof but differ in transmission conditions. The method further includes the step of receiving, at any given one of the wireless terminals, one of the sets of multicast information being transmitted under one of the differing transmission conditions.
45 Citations
16 Claims
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1. A method of delivering multicast service from an information delivery apparatus to wireless terminals that are experiencing different reception conditions within a service area, comprising the steps of:
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transmitting, from the information delivery apparatus, a plurality of identical sets of multicast information under respective different transmission conditions that correspond to the different reception conditions of the wireless terminals; and
receiving, at any given one of the wireless terminals, one of the identical sets of multicast information being transmitted under the respective different transmission conditions, said one of the identical sets being transmitted under one of the different transmission conditions and being received by use of said one of the different transmission conditions that is selected based on the reception quality measured at said given one of the wireless terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An information delivery apparatus for delivering multicast information by radio to wireless terminals that are experiencing different reception conditions within a service area, comprising:
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a multicast information storage unit which stores the multicast information to be transmitted; and
an information delivery control unit which controls said multicast information storage unit so as to transmit a plurality of identical sets of the multicast information, under respective different transmission conditions that are determined based on reception qualities of the wireless terminals reported from the wireless terminals. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A wireless terminal for receiving multicast information from an information delivery apparatus by radio, comprising:
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a reception quality measuring unit which measures a reception quality of a signal received from the information delivery apparatus;
a reception quality notifying unit which transmits the measured reception quality to the information delivery apparatus; and
an information reception control unit which receives one of identical sets of multicast information transmitted from the information delivery apparatus under respective different transmission conditions, said one of identical sets of multicast information being transmitted under one of the different transmission conditions and being received by use of said one of the different transmission conditions that is selected based on the reception quality measured by said reception quality measuring unit.
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Specification