Multicellular transmission method and apparatus

• US 5,940,385 A
• Filed: 10/22/1996
• Issued: 08/17/1999
• Est. Priority Date: 02/23/1995
• Status: Expired due to Term

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Mobile Communications Network Inc. (Nippon Telegraph and Telephone Corporation)
• Inventors: Yabusaki, Masami, Mita, Yasuhiro, Umeda, Narumi
• Primary Examiner(s): Ton, Dang
• Assistant Examiner(s): HOM, SHICK C
• Application Number:
  US08/732,411
• Time in Patent Office: 1,029 Days
• Field of Search: 370/349, 370/231, 370/232, 370/337, 370/347, 370/402, 370/403, 370/412, 370/468, 370/474, 370/476, 370/389, 370/394, 370/395
• US Class Current: 370/349
• CPC Class Codes: H04L 2012/5607 Radio
• CPC Class Codes: H04L 2012/5649 Cell delay or jitter
• CPC Class Codes: H04L 2012/5652 Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A multicellular transmission apparatus in a mobile communication network, capable of preventing delay involved in reassembling short packets into fixed length packets (ATM cells), degradation of communication signals due to the delay, and reduction of the transmission efficiency involved in assembling the short packets into the fixed length packets. When low speed information transmitted from a telephone set is converted into short packets by communication data assemblers/disassemblers in a mobile gateway switching center, followed by multiplexing of the short packets into the fixed length packets by fixed length packet assemblers/disassemblers, the short packets sent from a plurality of telephone sets are grouped for each destination node (a particular radio base station, for example) in the network, and are multiplexed into the fixed length packets belonging to the group bound for the destination of the short packets. This obviates the disassembling/reassembling of the fixed length packets at intermediate switching centers, thereby implementing an effective ATM switching system.

Claims

1. A multicellular transmission method comprising the steps of:

assembling signals sent from a plurality of source terminals into short packets bound for a same destination node at a first node in a network;

assembling said short packets into a fixed length packet which is to be sent to a destination node of said short packets;

identifying said destination node of said short packets from destination information of said short packets;

transferring said fixed length packet from said first node to said destination node; and

distributing, from said destination node to at least one destination terminal, the signals sent from said source terminals.

2. The multicellular transmission method of claim 1, wherein at least one intermediate node between said first node and said destination node transfers said fixed length packet to said destination node without changing said fixed length packet.

3. The multicellular transmission method of claim 1, wherein said first node is a mobile gateway switching center, and said destination node is a radio base station.

4. The multicellular transmission method of claim 1, wherein said first node is a radio base station and said destination node is a mobile gateway switching center.

5. A multicellular transmission apparatus comprising:

a plurality of communication data assemblers for assembling signals sent from source terminals into short packets bound for a same destination node;

a plurality of fixed length packet assemblers for multiplexing said short packets into fixed length packets;

an identifier, said identifier identifying the destination node of said short packets from destination information of said short packets;

a selector, said selector selecting at least one fixed length packet assembler for assembling said short packets into said fixed length packets which are to be sent to said destination node; and

a transmitter, said transmitter transferring said fixed length packets to said destination node.

6. The multicellular transmission apparatus of claim 5, further comprising at least one intermediate node between said first node and said destination node, wherein said intermediate node transfers said fixed length packets to said destination node without changing said fixed length packets.

7. The multicellular transmission apparatus of claim 6, further comprising a data manager, said data manager managing as a group said fixed length packets which are to be transferred to a same destination, and said selector providing said short packets to at least one of said fixed length packet assemblers for generating said fixed length packets of the same group.

8. The multicellular transmission apparatus of claim 7, further comprising a monitoring device, said monitoring device monitoring a vacant state of said fixed length packets in said same group, wherein said selector supplying said fixed length packet assemblers with said short packets, giving priority to said fixed length packet assemblers corresponding to fixed length packets including a minimum blank.

9. The multicellular transmission apparatus of claim 8, further comprising:

a measuring device, said measuring device measuring an occupied ratio of each of said fixed length packets by said short packets; and

an inhibitor, said inhibitor inhibiting said short packets from being multiplexed into said fixed length packets whose occupied ratio is higher than a predetermined threshold value.

10. The multicellular transmission apparatus of claim 5, wherein said multicellular transmission apparatus is installed in a mobile gateway switching center, and said destination node is a radio base station.

11. The multicellular transmission apparatus of claim 5, wherein said multicellular transmission apparatus is installed in a radio base station, and said destination node is a mobile gateway switching center.

12. A multicellular transmission method comprising the steps of:

assembling signals sent from a plurality of source terminals into short packets bound for a same destination node at a first node in a network;

assembling said short packets into fixed length packets which are to be sent to a destination node of said short packets;

identifying said destination node of said short packets from destination information of said short packets;

transferring said fixed length packets from said first node to said destination node in the network; and

distributing, from said destination node to at least one destination terminal, the signals sent from said source terminals.

13. The multicellular transmission method of claim 12, wherein said first node manages as a same group said fixed length packets which are to be transferred to a same destination, and further comprising the step of assembling each of said short packets into one of said fixed length packets of the same group.

14. The multicellular transmission method of claim further comprising the steps of:

monitoring a vacant state of said fixed length packets in said same group; and

assembling said short packets into said fixed length packets, giving priority to at least one of said fixed length packets including a minimum blank.

15. The multicellular transmission method of claim 14, further comprising the steps of:

measuring an occupied ratio of each of said fixed length packets by said short packets; and

inhibiting said short packets from being assembled into said fixed length packets whose occupied ratio is higher than a predetermined threshold value.

16. A multicellular transmission method comprising the steps of:

assembling signals sent from a plurality of source terminals into short packets bound for a same destination node at a first node in a network;

assembling the short packets into fixed length packets each of which are to be sent to the destination node of the short packets;

for each destination node to which the fixed length packets are transferred, managing the corresponding fixed length packets as a group;

assembling each of the short packets into one of the fixed length packets of the group corresponding to the destination node of the short packet;

identifying the destination node of each short packet from destination information of the short packet;

transferring the fixed length packets from the first node to the destination node in the network;

distributing, from the destination node to at least one destination terminal, the signals sent from the source terminals.

17. A multicellular transmission apparatus comprising:

a plurality of communication data assemblers coupled to a plurality of fixed length packet assemblers, the communication data assemblers assembling signals received from source terminals into short packets bound for a same destination node and transmitting the short packets to the fixed length packet assemblers;

a destination node identifier coupled to the communication data assembler, the destination node identifier identifying a destination node of each short packet from short packet destination information;

a selector coupled to the destination node identifier and the plurality of fixed length packet assemblers, for each short packet, the selector determining the fixed length packet assembler to be used to assemble the short packet into the fixed length packet corresponding to the destination node based on the short packet destination information; and

a transmitter coupled to the plurality of fixed length packet assemblers, the transmitter transferring each fixed length packet to its corresponding destination node.