Information downloading apparatus and mobile terminal

• US 8,054,797 B2
• Filed: 02/09/2010
• Issued: 11/08/2011
• Est. Priority Date: 09/20/2002
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Tajima, Yoshiharu, Kawabata, Kazuo
• Primary Examiner(s): Ahmed; Salman
• Application Number:
  US12/702,617
• Publication Number:
  US 20100142431A1
• Time in Patent Office: 637 Days
• Field of Search: 370/330, 370/432, 370/436, 370/438, 370/395.4, 370/337, 370/347, 455/60, 455/62
• US Class Current: 370/330
• CPC Class Codes: H04B 7/2653 for logical channel control
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

A technique for improving the efficiency of downloading transmission data is disclosed. An information downloading apparatus downloads differing sets of information to predetermined groups to which a mobile terminal may belong. This apparatus includes a channel selecting unit for selecting from plural information channels an information channel for transmitting transmission data and a transmitting unit for transmitting transmission data using the selected information channel. The channel selecting unit selects an information channel so that sets of transmission data with differing destination addresses may be transmitted through differing information channels. The transmitting unit transmits to each group, through a control channel, information pertaining to whether a set of transmission data exists, the information channel to be used if the set of transmission data exists, and the data length of the set of transmission data. The control channel includes time slots that are associated with the groups.

Claims

1. A wireless communication apparatus, comprising:

a receiving unit that receives data frequency information for transmitting data to a multicast group and offset information indicating an offset amount of a timing at which the data is to be transmitted with respect to a predetermined periodic reference timing, and receives the data being transmitted to the multicast group using a frequency determined by the frequency information at a transmission timing determined by the offset information; and

wherein the receiving unit receives the data being transmitted to the multicast group at a timing determined by the offset amount indicated by the offset information, which is transmitted prior to transmission of the data each time data transmission is to be performed.

2. The wireless communication apparatus as claimed in claim 1, wherein the data being transmitted to the multicast group includes a portion that temporally overlaps with another set of data being transmitted using a different frequency.

3. The wireless communication apparatus as claimed in claim 1, wherein the data corresponds to variable length data.

4. A multicast data receiving method for a wireless communication apparatus, the method comprising:

receiving data frequency information for transmitting data to a multicast group and offset information indicating an offset amount of a timing at which the data is to be transmitted with respect to a predetermined periodic reference timing; and

receiving the data being transmitted to the multicast group using a frequency determined by the frequency information at a transmission timing determined by the offset information;

wherein the data being transmitted to the multicast group is received at a timing determined by the offset amount indicated by the offset information, which is transmitted prior to transmission of the data each time data transmission is to be performed.

5. The multicast data receiving method as claimed in claim 4, wherein the data being transmitted to the multicast group includes a portion that temporally overlaps with another set of data being transmitted using a different frequency.

6. The multicast data receiving method as claimed in claim 4, wherein the data corresponds to variable length data.