Frame transmission/reception system, frame transmitting apparatus, frame receiving apparatus, and frame transmission/reception method

• US 20050036497A1
• Filed: 08/13/2004
• Published: 02/17/2005
• Est. Priority Date: 08/14/2003
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Kawakami, Hiroshi
• Application Number:
  US10/917,923
• Publication Number:
  US 20050036497A1
• Time in Patent Office: Days
• US Class Current: 370/395.210
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 1/1838 for semi-reliable protocols, e.g. for less sensitive applications such as streaming video buffer level management for video bitstream receiver H04N21/44004
• CPC Class Codes: H04L 1/1877 for semi-reliable protocols, e.g. for less sensitive applications like streaming video buffer level management for video bitstream control arrangements H04N21/44004
• CPC Class Codes: H04L 2001/0098 Unequal error protection

Abstract

An object is to provide a frame receiving apparatus capable of reducing establishment of radio protocol connections, while improving communication quality and performance of mobile equipment and network. In order to achieve this object, a frame receiving apparatus has a QoS reference part for identifying whether a frame is an acknowledgement type frame, based on a QoS identifier provided for each frame, and a sequence number reference part for determining whether a frame is lost, only for each acknowledgement type frame, and requesting retransmission of a lost frame.

Claims

1. A frame transmission/reception system for transferring a data packet on a connection established prior to communication, the system comprising:

identifier providing means for building frames for transmission of the data packet and for providing each of the built frames with a QoS identifier for identifying whether the frame is an acknowledgement type frame or an unacknowledgement type frame;

retransmission requesting means for identifying whether a frame is an acknowledgement type frame or an unacknowledgement type frame, based on the QoS identifier provided therefor, and for determining whether a frame is lost, only for each acknowledgement type frame, and requesting retransmission of the lost acknowledgement type frame; and

retransmitting means for retransmitting the acknowledgement type frame under the request for the retransmission.

2. A frame transmitting apparatus used in a frame transmission/reception system for transferring a data packet on a connection established prior to communication, the frame transmitting apparatus comprising:

identifier providing means for building frames for transmission of the data packet and for providing each of the built frames with a QoS identifier for identifying whether the frame is an acknowledgement type frame or an unacknowledgement type frame.

3. The frame transmitting apparatus according to claim 2, wherein the data packet is comprised of a plurality of data flows, and

wherein the identifier providing means provides each of the frames with a data flow identifier for identifying one of the data flows.

4. The frame transmitting apparatus according to claim 2, comprising number providing means for providing each acknowledgement type frame with a sequence number for each established connection.

5. The frame transmitting apparatus according to claim 3, comprising number providing means for providing each acknowledgement type frame with a sequence number for each established connection and for each data flow identifier.

6. A frame receiving apparatus used in a frame transmission/reception system for transferring a data packet on a connection established prior to connection, the frame receiving apparatus comprising:

retransmission requesting means for identifying whether a frame is an acknowledgement type frame or an unacknowledgement type frame, based on a QoS identifier provided therefor, and for determining whether a frame is lost, only for each acknowledgement type frame, and requesting retransmission of the lost acknowledgement type frame.

7. The frame receiving apparatus according to claim 6, comprising holding means for, when the retransmission requesting means requests retransmission of the acknowledgement type frame, temporarily holding a previously received acknowledgement type frame until reception of the acknowledgement type frame retransmitted according to the request for the retransmission.

8. The frame receiving apparatus according to claim 7, wherein the data packet is comprised of a plurality of data flows, and

wherein, where each of the frames is provided with a data flow identifier for identifying each of the data flows,

the holding means temporarily holds an acknowledgement type frame with the same data flow identifier as that of the lost acknowledgement type frame.

9. A frame transmission/reception method of transferring a data packet on a connection established prior to communication, the frame transmission/reception method comprising:

a step wherein identifier providing means builds frames for transmission of the data packet and provides each of the built frames with a QoS identifier for identifying whether the frame is an acknowledgement type frame or an unacknowledgement type frame;

a step wherein retransmission requesting means identifies whether a frame is an acknowledgement type frame or an unacknowledgement type frame, based on the QoS identifier provided therefor, and the retransmission requesting means determines whether a frame is lost, only for each acknowledgement type frame, and requests retransmission of the lost acknowledgement type frame; and

a step wherein retransmitting means retransmits the acknowledgement type frame under the request for the retransmission.