Data transmission method and device using controlled transmission profile

• US 7,948,901 B2
• Filed: 12/20/2007
• Issued: 05/24/2011
• Est. Priority Date: 12/28/2006
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Lee, Jinsock
• Primary Examiner(s): Wilson; Robert W
• Application Number:
  US11/960,756
• Publication Number:
  US 20080159337A1
• Time in Patent Office: 1,251 Days
• Field of Search: None
• US Class Current: 370/238
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1848 Time-out mechanisms
• CPC Class Codes: H04L 1/188 Time-out mechanisms
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/17 Interaction among intermediate nodes, e.g. hop by hop
• CPC Class Codes: H04L 47/22 Traffic shaping
• CPC Class Codes: H04L 47/2458 Modification of priorities while in transit
• CPC Class Codes: H04L 47/283 in response to processing delays, e.g. caused by jitter or round trip time [RTT]
• CPC Class Codes: H04L 47/35 by embedding flow control information in regular packets, e.g. piggybacking
• CPC Class Codes: H04W 28/02 Traffic management, e.g. flow control or congestion control
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]

Abstract

A data transmission method and system by which an arrival delay can be controlled are provided. A node (i) calculates a cumulative delay CUM_DLY(i) of a received packet cumulated up to the current hop, by using an arrival delay of the packet and a cumulative delay CUM_DLY(i−1) cumulated up to the previous hop, and compares the cumulative delay CUM_DLY(i) with a target cumulative delay TAR_CUM_DLY(i), thereby controlling a transmission profile for the packet so that an expected cumulative delay at the next node becomes closer to a target value. The node (i) writes the cumulative delay CUM_DLY(i) in a header of the packet and transmits the packet to the next node using the set transmission profile. Similar transmission profile control is carried out at each transit node in a multi-hop system, whereby the cumulative delay in the entire system can be controlled within a desired range.

Claims

1. A data transmission method for transmitting a data signal to a second node, the data transmission method comprising:

a first node estimating an expected cumulative delay at the second node to which the data signal is to be transmitted from the first node, the estimating being based on a transmission profile in order to control transmission of the data signal from the first node to the second node based on a target cumulative delay;

the first node controlling the transmission profile so that the expected cumulative delay at the second node converges to the target cumulative delay; and

the first node transmitting the data signal to the second node according to the transmission profile controlled by the first node.

2. The data transmission method according to claim 1, wherein the transmission profile is controlled based on a result of comparison of the target cumulative delay and a cumulative arrival delay of the data signal which arrives at the first node.

3. The data transmission method according to claim 1, wherein the transmission profile is a transmission parameter by which a number of retransmissions of the data signal between the first node and the second node is probabilistically adjusted.

5. The data transmission method according to claim 1, wherein the target cumulative delay is predetermined based on a total target delay of the data signal from a source node to a destination node.

6. The data transmission method according to claim 5, wherein the target cumulative delay is previously set for each node before the data signal is transmitted from the source node to the destination node.

7. The data transmission method according to claim 5, wherein the target cumulative delay is determined at each node when the data signal arrives at that node.

4. A data transmission method for transmitting a data signal to a downstream node, the data transmission method comprising:

a node controlling a transmission profile to control transmission of the data signal to the downstream node based on a target cumulative delay;

the node reading cumulative arrival delay information from the data signal, wherein the cumulative arrival delay information was written in the data signal by an upstream node;

the node calculating the cumulative arrival delay from the cumulative arrival delay information and an arrival delay that has occurred to the data signal between the upstream node and the node; and

the node transmitting the data signal in which the cumulative arrival delay is written as cumulative arrival delay information, to the downstream node.

8. A data transmission device which transmits a data signal from a first node to a second node downstream of the first node, the data transmission device comprising:

a transmission profile controller for estimating an expected cumulative delay at the second node based on a transmission profile in order to control transmission of the data signal from the first node to the second node based on a target cumulative delay, and controlling the transmission profile so that the expected cumulative delay at the second node converges to the target cumulative delay; and

a transmitter for transmitting the data signal to the second node according to the transmission profile controlled by the transmission profile controller.

9. The data transmission device according to claim 8, wherein the transmission profile controller controls the transmission profile based on a result of comparison of the target cumulative delay and a cumulative arrival delay of the data signal which arrives at the data transmission device.

10. The data transmission device according to claim 8, wherein the target cumulative delay is predetermined based on a total target delay of the data signal from a source node to a destination node.

11. The data transmission device according to claim 8, further comprising:

a transmitting-side retransmission controller for controlling a retransmission process with the second node;

wherein the transmission profile controller controls a transmission parameter by which a number of retransmissions of the data signal performed by the transmitting-side retransmission controller is probabilistically adjusted.

12. A data transmission device that transmits a data signal to a downstream node, the data transmission device comprising:

a transmission profile controller for controlling a transmission profile to control transmission of the data signal based on a target cumulative delay;

a transmitter for transmitting the data signal to the downstream node according to the controlled transmission profile;

an arrival delay calculator for calculating an arrival delay that has occurred to the data signal between an upstream node and the data transmission device;

a cumulative arrival delay calculator for calculating a cumulative arrival delay from the arrival delay and cumulative arrival delay information read from the data signal, wherein the cumulative arrival delay information was written in the data signal by an upstream node; and

a cumulative delay update section for writing the cumulative arrival delay as cumulative arrival delay information to the data signal.

13. The data transmission device according to claim 12, further comprising:

a receiving-side retransmission controller for controlling a retransmission process with the upstream node,

wherein the arrival delay is calculated based on a number of retransmissions of the data signal performed by the receiving-side retransmission controller.

14. A communication system comprising a transit node and a second node downstream of the transit node, the communication system for transmitting a data signal from the transit node to the second node:

the transit node comprising,

a transmission profile controller for estimating an expected cumulative delay at the second node based on a transmission profile in order to control transmission of the data signal from the transit node to the second node based on a target cumulative delay, and for controlling the transmission profile so that the expected cumulative delay at the second node converges to the target cumulative delay, and

a transmitter for transmitting the data signal from the transit node to the second node according to the transmission profile controlled by the transmission profile controller;

the second node comprising a receiver for receiving the data signal transmitted from the transit node.

15. The communication system according to claim 14, wherein the transmission profile controller controls the transmission profile based on a result of comparison of the target cumulative delay and a cumulative arrival delay of the data signal which arrives at the transit node.

16. The communication system according to claim 14, wherein the target cumulative delay is predetermined based on a total target delay of the data signal from a source node to a destination node.

17. A non-transitory computer readable medium storing a program than when executed causes the computer to function as a data transmission device which transmits a data signal the computer executing the steps of:

estimating an expected cumulative delay at the downstream node based on a transmission profile in order to control transmission of the data signal from the computer to the downstream node based on a target cumulative delay;

controlling the transmission profile so that the expected cumulative delay at the downstream node converges to the target cumulative delay; and

transmitting the data signal to the downstream node according to the transmission profile controlled by the computer.

18. A method, the method comprising:

at a source communication device, determining a probability of retransmission of a data signal from the source communication device to a destination communication device based on a target delay time, wherein the target delay time is predetermined based on a total target delay time of the data signal from the source communication device to the destination communication device;

transmitting the data signal between the source communication device and the destination communication device wherein both the source communication device and the destination have a retransmission protocol.

19. The method according to claim 18, wherein the source communication device further determines a probability of incomplete reception of the data signal.

20. The method according to claim 19, wherein the source communication device changes a transmission channel of the data signal.

21. The method according to claim 19, wherein the source communication device changes a number of transmission antennas used for transmission of the data signal.

22. The method according to claim 21, wherein the retransmission protocol is HARQ (Hybrid Automatic Repeat request).

23. The method according to claim 19, wherein the source communication device adjusts transmission power of the data signal.