NETWORK BROADCAST METHOD USING UNICAST AND RELAY NODE

• US 20140146803A1
• Filed: 11/01/2011
• Published: 05/29/2014
• Est. Priority Date: 05/24/2011
• Status: Active Grant

• Current Assignee: SungKyunKwan University's Research & Business Foundation (SungKyunKwan University)
• Original Assignee: SungKyunKwan University's Research & Business Foundation (SungKyunKwan University)
• Inventors: Lee, Tae-Jin, Oh, Chang-Yeong, Park, Jongho, Mah, Pyeong Soo, Ahn, Ji Hyoung, Cha, Woo Suk, Lee, Mingyu
• Granted Patent: US 10,448,216 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 74/0816 with collision avoidance

Abstract

A network broadcast method using a MAC unicast and an MPR node allows a source node to transmit a data packet to at least one MPR node which is located within one-hop distance from the source node and allows the at least one MPR node to transmit the data packet to each next-ranked MPR nodes. At least one normal node, which is not an MPR node while being located within one-hop distance from the source node, receives the data packet of the source node, which is transferred from the source node to an MPR node or transferred between MPR nodes through overhearing. Although the source node and MPR nodes are in a hidden-node relationship, collision is prevented, thereby minimizing data packet loss to improve the transmission reliability, and enabling the data packet of the source node to be reliably broadcasted on a network.

Claims

1. A network broadcast method comprising:

transmitting, by a source node, a data packet to one or more MPR nodes within one hop distance from the source node using a MAC unicast scheme;

transmitting, by the one or more MPR nodes, a data packet to a next ranking MPR node of each MPR node using a MAC unicast scheme; and

transmitting, by the one or more MPR nodes, a data packet to a normal node within one hop distance from each MPR node using a MAC unicast scheme when there is no next ranking MPR node of the node within the one hop distance,

wherein transmitting a data packet to one or more MPR nodes of the source node and transmitting a data packet to a next ranking MPR node of each MPR node, one or more normal nodes other than the MPR node within one hop distance from the source node receive the data packet of the source node, which is transmitted from the source node to the MPR node, through overhearing.

2. The network broadcast method of claim 1, wherein the transmitting of the data packet comprises obtaining a transmission channel by performing NAV setting through exchanging a RTS-CTS packet before transmitting the data packet in order to avoid a collision due to transmission of nodes which are in a hidden node relation.

3. A network broadcast method comprising:

transmitting, by a source node, a data packet to one or more MPR nodes within one hop distance from the source node using a MAC unicast scheme;

transmitting, by the one or more MPR nodes, a data packet to a next ranking MPR node of each MPR node using a MAC unicast scheme; and

transmitting, by the one or more MPR nodes, a data packet to a normal node within one hop distance from each MPR node using a MAC unicast scheme when there is no next ranking MPR node of the node within the one hop distance,

wherein transmitting a data packet to a next ranking MPR node of each MPR node, one or more normal nodes other than the MPR node within one hop distance from the MPR nodes receive the data packet of the source node, which is transmitted between the MPR nodes, through overhearing.

4. The network broadcast method of claim 3, wherein the transmitting of the data packet comprises obtaining a transmission channel by performing NAV setting through exchanging a RTS-CTS packet before transmitting the data packet in order to avoid a collision due to transmission of nodes which are in a hidden node relation.

5. A network broadcast method comprising:

transmitting, by a source node, a data packet to a first MPR node of the source node;

transmitting, by the first MPR node of the source node, the data packet of the source node to a first next ranking MPR node of the first MPR node; and

transmitting, by the first next ranking MPR node which has first received the data packet of the first MPR node, the data packet of the source node to a normal node,

wherein the source node and the MPR nodes obtain a channel which transmits the data packet by exchanging an RTS-CTS packet before transmitting the data packet of the source node.

6. The network broadcast method of claim 5, wherein the transmitting, by the source node, of the data packet to the first MPR node of the source node comprises receiving a CTS packet, which is transmitted from the first MPR node to the source node, in the first next ranking MPR node of the first MPR node, through overhearing, and performing NAV setting so as to prevent a collision.

7. The network broadcast method of claim 5, wherein the transmitting, by the first MPR node of the source node, the data packet of the source node to a first next ranking MPR node of the first MPR node comprises receiving, by the first MPR node of the source node, an RTS packet, which is transmitted to the first next ranking MPR node of the first MPR node, through overhearing and performing NAV setting so as to prevent a collision.

8. The network broadcast method of claim 5, wherein the transmitting, by the first next ranking MPR node which has first received the data packet of the first MPR node, the data packet of the source node to a normal node comprises receiving, by the first MPR node of the source node, the RTS packet, which is transmitted from the first next ranking MPR node of the first MPR node to the normal node, through overhearing, and performing NAV setting so as to prevent a collision.

9. The network broadcast method of one of claim 5, wherein the data packet is transmitted through a MAC unicast scheme.