DATA TRANSMISSION METHOD AND DEVICE USING CONTROLLED TRANSMISSION PROFILE

• US 20080159337A1
• Filed: 12/20/2007
• Published: 07/03/2008
• Est. Priority Date: 12/28/2006
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: LEE, Jinsock
• Granted Patent: US 7,948,901 B2
• Time in Patent Office: Days
• US Class Current: 370/498
• 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 in a node which transmits a data signal to a downstream node, comprising:

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

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

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 node.

3. The data transmission method according to claim 1, wherein the transmission profile is controlled so that an expected cumulative delay obtained from the transmission profile becomes closer to the target cumulative delay at the downstream node.

4. 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 node and the downstream node is probabilistically adjusted.

5. The data transmission method according to claim 1, further comprising:

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;

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

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

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

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

8. The data transmission method according to claim 6, wherein the target cumulative arrival delay is determined at each node when the data signal arrives at that node.

9. A data transmission device which transmits a data signal to a downstream node, comprising:

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

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

10. The data transmission device according to claim 9, 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 node.

11. The data transmission device according to claim 9, wherein the transmission profile controller controls the transmission profile so that an expected cumulative delay obtained from the transmission profile becomes closer to the target cumulative delay at the downstream node.

12. The data transmission device according to claim 9, further comprising:

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 9, further comprising:

a transmitting-side retransmission controller for controlling a retransmission process with the downstream 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.

14. 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.

15. A communication system for transmitting packets through at least one transit node, wherein each transit node comprises:

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

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

16. The communication system according to claim 15, 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 node.

17. The communication system according to claim 15, wherein the transmission profile controller controls the transmission profile so that an expected cumulative delay obtained from the transmission profile becomes closer to the target cumulative delay at the downstream node.

18. A transit node in the communication system according to claim 15.

19. A program for instructing a computer to function as a data transmission device which transmits a data signal to a downstream node, comprising:

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

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

20. A method for transmitting a data signal between communication devices each having a retransmission protocol, comprising:

at a transmitting-side communication device, adjusting a probability of occurrence of a retransmission operation of the data signal according to a target delay.

21. The method according to claim 20, wherein the transmitting-side communication device adjusts a probability of occurrence of an error or incompletely reception of the data signal.

22. The method according to claim 21, wherein the transmitting-side communication device adjusts transmission power of the data signal.

23. The method according to claim 21, wherein the transmitting-side communication device changes a transmission channel of the data signal.

24. The method according to claim 21, wherein the transmitting-side communication device changes a number of transmission antennas used for transmission of the data signal.

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