Method of checking and acknowledging reception of data in a two-way radio communication system

• US 6,188,872 B1
• Filed: 10/02/1998
• Issued: 02/13/2001
• Est. Priority Date: 10/03/1997
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Materials Corporation
• Original Assignee: Mitsubishi Materials Corporation
• Inventors: Nagira, Tumoru, Shibuno, Akira, Nakamura, Kenzo, Hosobuchi, Kenichiro
• Primary Examiner(s): Hunter, Daniel S.
• Assistant Examiner(s): LE, LANA N
• Application Number:
  US09/165,092
• Time in Patent Office: 865 Days
• Field of Search: 455/11.1, 455/422, 455/445, 455/450, 455/550, 455/575, 455/458, 370/328, 370/338, 370/349
• US Class Current: 455/11.1
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint

Abstract

A method of checking and acknowledging reception of a message in a two-way radio communication system without causing a reduction in the efficiency of processing the message, a storage medium on which a reception checking and acknowledging program is stored for use in the two-way radio communication system, and a two-way radio communication system and a base station for use in the two-way radio communication system is provided. If message data transmitted by a terminal device is received by a base station via a relay station and an Internet network, the base station generates reception acknowledgment data and transmits it in such a manner that when downstream message data is transmitted toward a plurality of terminal devices, the above-described reception acknowledgment data is added to the downstream message data and the resultant data is transmitted to the plurality of terminal devices.

Claims

1. A method of checking and acknowledging reception of information in a two-way radio communication system in which information sent from a radio communication terminal device at a sending end is received by a relay station, the received information is transferred to a base station via a transmission line, and the information originating from the radio communication terminal device at the sending end is further transferred from the base station to a radio communication terminal device designated as the destination of the information thereby allowing a plurality of radio communication terminal devices to transmit and receive information to and from each other, wherein, in the process of transferring the information from the radio communication terminal device at the sending end to the radio communication terminal device at the destination, reception of the information originating from the radio communication terminal device at the sending end is checked and data indicating the result is sent to the radio communication terminal device at the sending end, and wherein said base station is adapted to operate in such a manner that:

when said base station correctly receives information sent from a radio communication terminal device at the sending end via the relay station and transmission line, said base station generates base station reception acknowledgment information indicating that said information has been correctly received; and

when said base station transmits the information addressed to any of said plurality of radio communication terminals devices toward said plurality of radio communication terminal devices, said base station adds to said information said base station reception acknowledgment information addressed to the radio communication terminal device at said sending end and transmits the resultant information.

2. The method according to claim 1, wherein said two-way radio communication system includes a plurality of transmission line communication terminal devices that are connected to said transmission line so that said transmission line communication terminal devices may transmit and receive information to and from said plurality of radio communication terminal devices via said base station, and wherein said base station is adapted to operate in such a manner that:

if said base station receives information that originates from any of said plurality of radio communication terminal devices and that is addressed to any of said plurality of transmission line communication terminal devices, said base station transmits said information via said transmission line to the transmission line communication terminal device designated as the destination of said information;

if said base station correctly receives information that originates from a radio communication terminal device at a sending end via said relay station and transmission line and that is addressed to any of said plurality of radio communication terminal devices or any of said plurality of transmission line communication terminal devices, said base station generates base station reception acknowledgment information indicating that said information has been correctly received; and

when said base station transmits the information addressed to any of said plurality of radio communication terminal devices toward said plurality of radio communication terminal devices, said base station adds to said information said base station reception acknowledgment information addressed to the radio communication terminal device at said sending end and transmits the resultant information.

3. The method according to claim 2, wherein:

said plurality of radio communication terminal devices are adapted to operate in such a manner that when any of said plurality of radio communication terminal device receives information addressed to that radio communication terminal device, said radio communication terminal device generates terminal device reception acknowledgment information addressed to a radio communication terminal device or a transmission line communication terminal device that is the original sender of said information, and transmits said terminal device reception acknowledgment information to the relay station;

said base station is adapted to operate in such a manner that when said base station receives said terminal device reception acknowledgment information via said relay station and transmission line,

if said terminal device reception acknowledgment information is addressed to any of said plurality of radio communication terminal devices, then said base station adds said terminal device reception acknowledgment information to said information when said base stations transmits said information addressed to said any of the plurality of radio communication terminal devices toward said plurality of radio communication terminal devices,

if said terminal device reception acknowledgment information is addressed to a transmission line communication terminal device, then said base station transmits said terminal device reception acknowledgment information via the transmission line to the transmission line communication terminal device that is the original sender of said information.

4. The method according to claim 3, wherein said base station is adapted to operate in such a manner that:

when said base station transmits information, that originates from any of said plurality of radio communication terminal devices and that is addressed to any of said radio communication terminal device or any of said transmission line communication terminal devices, to the plurality of radio communication terminal devices or transmission line communication terminal devices, said base station generates transmission acknowledgment information which will be sent to the radio communication terminal device that is the original sender of said information so as to inform that said information has been correctly transmitted from said base station; and

when said base station transmits the information addressed to any of said plurality of radio communication terminal devices toward the plurality of radio communication terminal devices, said base station adds said transmission acknowledgment information to said information and transmits the resultant information.

5. The method according to claim 4, wherein said base station is further adapted to operate in such a manner that:

said base station stores the information addressed to a radio communication terminal device or a transmission line communication terminal device, said terminal device reception acknowledgment information and base station reception acknowledgment information, and said transmission acknowledgment information, separately from each other, whenever such information is received; and

when said base station transmits the stored information addressed to a radio communication terminal device, said base station adds at least one piece of stored terminal device reception acknowledgment information or one piece of base station reception acknowledgment information or one piece of transmission acknowledgment information to said information and transmits the resultant information.

6. A two-way radio communication system including:

a base station that transmits information received via a transmission line, as a downstream signal;

a plurality of radio communication terminal devices that receive information addressed to themselves via the downstream signal and that also transmit information generated by themselves as an upstream signal; and

a plurality of relay stations that receive an upstream signal transmitted from the radio communication terminal devices and transmit the information included in said upstream signal to said base station via the transmission line, whereby said plurality of radio communication terminal devices transmit and receive information to and from one another via the base station and the relay station;

said base station including;

base station reception acknowledgment information generating means adapted to operate in such a manner that when said base station correctly receives information originating from a radio communication terminal device via the relay station and transmission line, said base station reception acknowledgment information generating means generates base station reception acknowledgment information indicating that said information has been correctly received; and

base station reception acknowledgment information adding means adapted to operate in such a manner that when said base station transmits the information addressed to any of said plurality of radio communication terminal devices toward said plurality of radio communication terminal devices;

wherein said base station reception acknowledgment information adding means adds to said information said base station reception acknowledgment information addressed to the radio communication terminal device that is the original sender of said information.

7. The system according to claim 6, further comprising a plurality of transmission line communication terminal devices that are connected to said transmission line so that said transmission line communication terminal devices may transmit and receive information to and from said plurality of radio communication terminal devices via said transmission line and said base station;

wherein said base station includes transmission line transmitting means adapted to operate in such a manner that if said base station receives information that originates from any of said plurality of radio communication terminal devices and that is addressed to any of said plurality of transmission line communication terminal devices, said transmission line transmitting means transmits said information via said transmission line to the transmission line communication terminal device designated as the destination of said information; and

wherein if said base station correctly receives information that originates from a radio communication terminal device at a sending end via said relay station and transmission line and that is addressed to any of said plurality of radio communication terminal devices or any of said plurality of transmission line communication terminal devices, said base station reception acknowledgment information generating means generates base station reception acknowledgment information indicating that said information has been correctly received.

8. The system according to claim 7, wherein each of said plurality of radio communication terminal devices comprises:

terminal device reception acknowledgment information generating means adapted to operate in such a manner that when any of said plurality of radio communication terminal device receives information addressed to that radio communication terminal device, said terminal device reception acknowledgment information generating means generates terminal device reception acknowledgment information addressed to a radio communication terminal device or a transmission line communication terminal device that is the original-sender of said information; and

upstream signal transmitting means for transmitting said terminal device reception acknowledgment information as an upstream signal; and

wherein said base station includes;

terminal device reception acknowledgment information adding means adapted to operate in such a manner that if the terminal device reception acknowledgment information received via said relay station and the transmission line is addressed to any of said plurality of radio communication terminal devices, said terminal device reception acknowledgment information adding means adds said terminal device reception acknowledgment information to said information when said information addressed to said any of the plurality of radio communication terminal devices is transmitted toward said plurality of radio communication terminal devices; and

terminal device reception acknowledgment information transmitting means adapted to operate in such a manner that if said terminal device reception acknowledgment information is addressed to a transmission line communication terminal device, said terminal device reception acknowledgment information transmitting means transmits said terminal device reception acknowledgment information via the transmission line to the transmission line communication terminal device that is the original sender of said information.

9. The system according to claim 8, wherein said base station includes:

transmission acknowledgment information generating means adapted to operate in such a manner that when said base station transmits information, that originates from any of said plurality of radio communication terminal devices and that is addressed to any of said radio communication terminal device or any of said transmission line communication terminal devices, to the plurality of radio communication terminal devices or transmission line communication terminal devices, said transmission acknowledgment information generating means generates transmission acknowledgment information that will be sent to the radio communication terminal device that is the original sender of said information so as to inform that said information has been correctly transmitted from said base station; and

transmission acknowledgment information adding means adapted to operate in such a manner that when said base station transmits the information addressed to any of said plurality of radio communication terminal devices toward the plurality of radio communication terminal devices, said transmission acknowledgment information adding means adds said transmission acknowledgment information to said information addressed to said any of said plurality of radio communication terminal devices.

10. The system according to claim 9, wherein said base station includes storage means for storing the information to be transmitted to said plurality of radio communication terminal device, said terminal device reception acknowledgment information and base station reception acknowledgment information, and said transmission acknowledgment information, separately from each other, whenever such information is received;

and

wherein when said base station transmits, as a downstream signal, the information stored in said storage means to said plurality of radio communication terminal devices, said base station reception acknowledgment information adding means, terminal device reception acknowledgment information adding means, and transmission acknowledgment information adding means read at least one piece of terminal device reception acknowledgment information and one piece of base station reception acknowledgment information, and one piece of transmission acknowledgment information, from said storage means and add them to said information.

16. The system according to any of claims 6 to 15, wherein said transmission line is the Internet.

11. A two-way radio communication system comprising:

a base station that transmits information received via a transmission line, as a downstream signal;

a plurality of radio communication terminal devices that receive information addressed to themselves via the downstream signal and that also transmit information generated by themselves as an upstream signal; and

a plurality of relay stations that receive an upstream signal transmitted from the radio communication terminal devices and transmit the information included in said upstream signal to said base station via the transmission line, whereby said plurality of radio communication terminal devices transmit and receive information to and from one another via the base station and the relay station;

said base station including;

a base station data processing unit adapted to operate in such a manner that when said base station correctly receives information originating from a radio communication terminal device via the relay station and transmission line, said base station data processing unit generates base station reception acknowledgment information indicating that said information has been correctly received; and

a data adding unit adapted to operate in such a manner that when said base station transmits the information addressed to any of said plurality of radio communication terminal devices toward said plurality of radio communication terminal devices, said data adding unit adds to said information said base station reception acknowledgment information addressed to the radio communication terminal device from which said information originates.

12. The system according to claim 11, further comprising a plurality of transmission line communication terminal devices that are connected to said transmission line so that said transmission line communication terminal devices may transmit and receive information to and from said plurality of radio communication terminal devices via said transmission line and said base station;

wherein said base station includes a transmission line transmitter adapted to operate in such a manner that if said base station receives information that originates from any of said plurality of radio communication terminal devices and that is addressed to any of said plurality of transmission line communication terminal devices, then said transmission line transmitter transmits said information via said transmission line to the transmission line communication terminal device designated as the destination of said information; and

wherein if said base station correctly receives information that originates from a radio communication terminal device at a sending end via said relay station and transmission line and that is addressed to any of said plurality of radio communication terminal devices or any of said plurality of transmission line communication terminal devices, said base station data processing unit generates base station reception acknowledgment information indicating that said information has been correctly received.

13. The system according to claim 12, wherein each of said plurality of radio communication terminal devices comprises:

a terminal data generator adapted to in such a manner that when any of said plurality of radio communication terminal device receives information addressed to that radio communication terminal device, said terminal data generator generates terminal device reception acknowledgment information addressed to a radio communication terminal device or a transmission line communication terminal device that is the original sender of said information; and

upstream signal transmitter for transmitting said terminal device reception acknowledgment information as an upstream signal; and

wherein said base station data processing unit of said base station is adapted to operate in such a manner that;

said base station data processing unit determines whether the terminal device reception acknowledgment information received via said relay station and the transmission line is addressed to a radio communication terminal device or a transmission line communication terminal device; and

if said base station data processing unit determines that said terminal device reception acknowledgment information is addressed to a transmission line communication terminal device, said base station data processing unit transmits said terminal device reception acknowledgment information to said transmission line communication terminal device; and

if said base station data processing unit determines that said terminal device reception acknowledgment information is addressed to a radio communication terminal device, when the information addressed to any of said plurality of radio communication terminal devices is transmitted toward said plurality of radio communication terminal devices, said base station data processing unit adds said terminal device reception acknowledgment information to said information.

14. The system according to claim 13, wherein:

said base station data processing unit of said base station is adapted to operate in such a manner that when said base station transmits information, that originates from any of said plurality of radio communication terminal devices and that is addressed to any of said radio communication terminal device or any of said transmission line communication terminal devices, to the plurality of radio communication terminal devices or transmission line communication terminal devices, said base station data processing unit generates transmission acknowledgment information that will be sent to the radio communication terminal device that is the original sender of said information so as to inform that said information has been correctly transmitted from said base station; and

said data adding unit is adapted to operate in such a manner that when said base station transmits the information addressed to any of said plurality of radio communication terminal devices toward said plurality of radio communication terminal devices, said data adding unit adds said base station reception acknowledgment information to said information.

15. The system according to claim 14, wherein:

said base station includes memories for storing the information to be transmitted to said plurality of radio communication terminal device, said terminal device reception acknowledgment information and base station reception acknowledgment information, and said transmission acknowledgment information, respectively, whenever such information is received; and

said data adding unit is adapted to operate in such a manner that when said base station transmits, as a downstream signal, the information stored in said memories to said plurality of radio communication terminal devices, said data adding unit reads at least one piece of terminal device reception acknowledgment information and one piece of base station reception acknowledgment information, and one piece of transmission acknowledgment information, from said memories and adds them to said information.

17. A base station for use in a two-way radio communication system in which information sent from a radio communication terminal device at a sending end is received by a relay station, the received information is transferred to a base station via a transmission line, and the information originating from the radio communication terminal device at the sending end is further transferred from the base station to a radio communication terminal device designated as the destination of the information thereby allowing a plurality of radio communication terminal devices to transmit and receive information to and from each other,

said base station including:

base station reception acknowledgment information generating means adapted to operate in such a manner that when said base station correctly receives information originating from a radio communication terminal device via the relay station and transmission line, said base station reception acknowledgment information generating means generates base station reception acknowledgment information indicating that said information has been correctly received;

base station reception acknowledgment information adding means adapted to operate in such a manner that when said base station transmits the information addressed to any of said plurality of radio communication terminal devices toward said plurality of radio communication terminal devices, said base station reception acknowledgment information adding means adds to said information said base station reception acknowledgment information addressed to the radio communication terminal device that is the original sender of said information; and

transmission means for transmitting the information addressed to any of said plurality of radio communication terminal devices and said base station reception acknowledgment information added to said information toward said plurality of radio communication terminal devices.

18. The base station according to claim 17, further including transmission line transmitting means adapted to operate in such a manner that if said base station receives information that originates from any of said plurality of radio communication terminal devices and that is addressed to any of a plurality of transmission line communication terminal devices connected to said transmission line, said transmission line transmitting means transmits said information via said transmission line to the transmission line communication terminal device designated as the destination of said information,

wherein if said base station correctly receives information that originates from a radio communication terminal device at a sending end via said relay station and transmission line and that is addressed to any of said plurality of radio communication terminal devices or any of said plurality of transmission line communication terminal devices, said base station reception acknowledgment information generating means generates base station reception acknowledgment information indicating that said information has been correctly received.

19. The base station according to claim 18, further including:

terminal device reception acknowledgment information adding means adapted to operate in such a manner that when said base station receives terminal device reception acknowledgment information from any of said plurality of radio communication terminal devices via said relay station and said transmission line, said terminal device reception acknowledgment information indicating that said radio communication terminal device has correctly received information, if said terminal device reception acknowledgment information is addressed to any of said plurality of radio communication terminal devices, said terminal device reception acknowledgment information adding means adds said terminal device reception acknowledgment information to information addressed to any of said plurality of radio communication terminal devices when said transmission means transmits said information addressed to said any of the plurality of radio communication terminal devices toward said plurality of radio communication terminal devices; and

transmission line transmission controlling means adapted to operate in such a manner that when said terminal device reception acknowledgment information is addressed to a transmission line communication terminal device, said transmission line transmission controlling means controls said transmission line transmitting means to transmit said terminal device reception acknowledgment information to the transmission line communication terminal device that is the original sender of said information.

20. The base station according to claim 19, further including:

transmission acknowledgment information generating means adapted to operate in such a manner that when said transmission means or said transmission line transmitting means transmits information, that originates from any of said plurality of radio communication terminal devices and that is addressed to any of said radio communication terminal device or any of said transmission line communication terminal devices, to the plurality of radio communication terminal devices or transmission line communication terminal devices, said transmission acknowledgment information generating means generates transmission acknowledgment information that will be sent to the radio communication terminal device that is the original sender of said information so as to inform that said information has been correctly transmitted from said base station; and

transmission acknowledgment information adding means adapted to operate in such a manner that when said base station transmits the information addressed to any of said plurality of radio communication terminal devices toward the plurality of radio communication terminal devices, said transmission acknowledgment information adding means adds said transmission acknowledgment information to said information addressed to said any of said plurality of radio communication terminal devices.

21. The base station according to claim 19, further including storage means for storing the information to be transmitted to said plurality of radio communication terminal device, said terminal device reception acknowledgment information and base station reception acknowledgment information, and said transmission acknowledgment information, separately from each other, whenever such information is received;

wherein when said base station transmits the information stored in said storage means to said plurality of radio communication terminal devices, said base station reception acknowledgment information adding means, terminal device reception acknowledgment information adding means, and transmission acknowledgment information adding means read at least one piece of terminal device reception acknowledgment information and one piece of base station reception acknowledgment information, and one piece of transmission acknowledgment information from said storage means and add them to said information.

22. A base station for use in a two-way radio communication system in which information sent from a radio communication terminal device at a sending end is received by a relay station, the received information is transferred to a base station via a transmission line, and the information originating from the radio communication terminal device at the sending end is further transferred from the base station to a radio communication terminal device designated as the destination of the information thereby allowing a plurality of radio communication terminal devices to transmit and receive information to and from each other,

said base station including:

a data processing unit adapted to operate in such a manner that when said base station correctly receives information originating from a radio communication terminal device via the relay station and transmission line, said data processing unit generates base station reception acknowledgment information indicating that said information has been correctly received;

a data adding unit adapted to operate in such a manner that when said base station transmits the information addressed to any of said plurality of radio communication terminal devices toward said plurality of radio communication terminal devices, said data adding unit adds to said information said base station reception acknowledgment information addressed to the radio communication terminal device that is the original sender of said information; and

a transmitter for transmitting the information addressed to any of said plurality of radio communication terminal devices and said base station reception acknowledgment information added to said information toward said plurality of radio communication terminal devices.

23. The base station according to claim 22, further including a transmission line transmitter adapted to operate in such a manner that if said base station receives information that originates from any of said plurality of radio communication terminal devices and that is addressed to any of a plurality of transmission line communication terminal devices connected to said transmission line, said transmission line transmitter transmits said information via said transmission line to the transmission line communication terminal device designated as the destination of said information;

wherein if said base station correctly receives information that originates from a radio communication terminal device at a sending end via said relay station and transmission line and that is addressed to any of said plurality of radio communication terminal devices or any of said plurality of transmission line communication terminal devices, said data processing unit generates base station reception acknowledgment information indicating that said information has been correctly received.

24. The base station according to claim 23, wherein said data processing unit is adapted to operate in such a manner that:

when said base station receives terminal device reception acknowledgment information from any of said plurality of radio communication terminal devices via said relay station and said transmission line, said terminal device reception acknowledgment information indicating that said radio communication terminal device has correctly received information, said data processing unit determines whether said terminal device reception acknowledgment information is addressed to a radio communication terminal device or a transmission line communication terminal device; and

if data processing unit determines that said terminal device reception acknowledgment information is addressed to a transmission line communication terminal device, said data processing unit outputs said terminal device reception acknowledgment information to said transmission line transmitter so that said transmission line transmitter transmits said terminal device reception acknowledgment information to said transmission line communication terminal device that is the original sender of the information; and

if data processing unit determines that said terminal device reception acknowledgment information is addressed to a radio communication terminal device, when the information addressed to any of said plurality of radio communication terminal devices is transmitted toward said plurality of radio communication terminal devices, said data adding unit adds said terminal device reception acknowledgment information to said information.

25. The base station according to claim 24, wherein said data processing unit is adapted to operate in such a manner that when said transmitter or said transmission line transmitter transmits information, that originates from any of said plurality of radio communication terminal devices and that is addressed to any of said radio communication terminal device or any of said transmission line communication terminal devices, to the plurality of radio communication terminal devices or transmission line communication terminal devices, said data processing unit generates transmission acknowledgment information which will be sent to the radio communication terminal device that is the original sender of said information so as to inform that said information has been correctly transmitted from said base station;

and

said data adding unit is adapted to operate in such a manner that when said base station transmits the information addressed to any of said plurality of radio communication terminal devices toward said plurality of radio communication terminal devices, said data adding unit adds said base station reception acknowledgment information to said information.

26. The base station according to claim 25, further including memories for storing the information to be transmitted to said plurality of radio communication terminal device, said terminal device reception acknowledgment information and base station reception acknowledgment information, and said transmission acknowledgment information, respectively, whenever such information is received;

wherein said data adding unit is adapted to operate in such a manner that when said base station transmits the information stored in said memories to said plurality of radio communication terminal devices, said data adding unit reads at least one piece of terminal device reception acknowledgment information and one piece of base station reception acknowledgment information, and one piece of transmission acknowledgment information, from respective said memories and adds them to said information.

27. A computer-readable storage medium on which reception checking and acknowledging program is stored, for use in a two-way radio communication system in which information sent from a radio communication terminal device at a sending end is received by a relay station, the received information is transferred to a base station via a transmission line, and the information originating from the radio communication terminal device at the sending end is further transferred from the base station to a radio communication terminal device designated as the destination of the information thereby allowing a plurality of radio communication terminal devices to transmit and receive information to and from each other, wherein, in the process of transferring the information from the radio communication terminal device at the sending end to the radio communication terminal device at the destination, said reception checking and acknowledging program checks whether the information originating from the radio communication terminal device at the sending end has been correctly received and transmits data indicating the result to the radio communication terminal device at the sending end, said reception checking and acknowledging program comprising:

a first step in which when said base station correctly receives information sent from a radio communication terminal device at the sending end via the relay station and transmission line, base station reception acknowledgment information indicating that said information has been correctly received is generated in said base station; and

a second step in which when the information addressed to any of said plurality of radio communication terminal devices is transmitted from said base station toward said plurality of radio communication terminal devices, said base station reception acknowledgment information addressed to the radio communication terminal device at said sending end is added to said information and the resultant information is transmitted.

28. The computer-readable storage medium on which reception checking and acknowledging program according to claim 27 is stored, wherein said two-way radio communication system includes a plurality of transmission line communication terminal devices that are connected to said transmission line so that said transmission line communication terminal devices may transmit and receive information to and from said plurality of radio communication terminal devices via said base station, said reception checking and acknowledging program further comprising:

a third step in which if information that originates from any of said plurality of radio communication terminal devices and that is addressed to any of said plurality of transmission line communication terminal devices is received by said base station, said information is transmitted via said transmission line to the transmission line communication terminal device designated as the destination of said information;

a fourth step in which if information that originates from a radio communication terminal device at a sending end via said relay station and transmission line and that is addressed to any of said plurality of radio communication terminal devices or any of said plurality of transmission line communication terminal devices is correctly received by said base station, base station reception acknowledgment information indicating that said information has been correctly received is generated; and

a fifth step in which when the information addressed to any of said plurality of radio communication terminal devices is transmitted from said base station toward said plurality of radio communication terminal devices, said base station reception acknowledgment information addressed to the radio communication terminal device at said sending end is added to said information and the resultant information is transmitted.

29. The computer-readable storage medium on which reception checking and acknowledging program according to claim 28 is stored, wherein said reception checking and acknowledging program further comprises:

a sixth step in which when terminal device reception acknowledgment information is received from any of said plurality of radio communication terminal devices via said relay station and said transmission line, said terminal device reception acknowledgment information indicating that said radio communication terminal device has correctly received information, if said terminal device reception acknowledgment information is addressed to any of said plurality of radio communication terminal devices, when said information addressed to said any of the plurality of radio communication terminal devices is transmitted from said base station toward said plurality of radio communication terminal devices, said terminal device reception acknowledgment information is added to said information and the resultant information is transmitted; and

a seventh step in which if said terminal device reception acknowledgment information is addressed to a transmission line communication terminal device, said terminal device reception acknowledgment information is transmitted via said transmission line to the transmission line communication terminal device that is the original sender of said information.

30. The computer-readable storage medium on which reception checking and acknowledging program according to claim 29 is stored, wherein said reception checking and acknowledging program further comprises:

an eighth step in which when information that originates from any of said plurality of radio communication terminal devices and that is addressed to any of said radio communication terminal device or any of said transmission line communication terminal devices is transmitted from said base station to the plurality of radio communication terminal devices or transmission line communication terminal devices, transmission acknowledgment information is generated which will be sent to the radio communication terminal device that is the original sender of said information so as to inform that said information has been correctly transmitted from said base station; and

a ninth step in which when the information addressed to any of said plurality of radio communication terminal devices is transmitted toward the plurality of radio communication terminal devices, said transmission acknowledgment information is added to said information and the resultant information is transmitted.

31. The computer-readable storage medium on which reception checking and acknowledging program according to claim 30 is stored, wherein said reception checking and acknowledging program further comprises:

a tenth step in which the information addressed to a radio communication terminal device or a transmission line communication terminal device, said terminal device reception acknowledgment information and base station reception acknowledgment information, and said transmission acknowledgment information are stored separately from each other whenever such information is received by said base station; and

an eleventh step in which when the stored information addressed to a radio communication terminal device is transmitted from said base station, at least one piece of stored terminal device reception acknowledgment information or one piece of base station reception acknowledgment information or one piece of transmission acknowledgment information is added to said information and the resultant information is transmitted.