US-12621741-B2 - Data relay method and device in communication system

US12621741B2US 12621741 B2US12621741 B2US 12621741B2US-12621741-B2

Abstract

Disclosed are a relay method and device in a communication system. An operation method of a first communication node comprises the steps of: transmitting a reference signal to one or more candidate R nodes; receiving first feedback information including a minimum value of a first RSRP from a first candidate R node belonging to the one or more candidate R nodes; receiving second feedback information including a minimum value of a second RSRP from a second candidate R node belonging to the one or more candidate R nodes; comparing a first value based on the first feedback information with a second value based on the second feedback information; when the first value is greater than the second value, selecting the first candidate R node as an R node that is to perform a relaying operation; and communicating with a second communication node via the R node.

Inventors

Jun Hyeong Kim
Il Gyu KIM
Go San Noh
Hee Sang Chung
Dae Soon CHO
Sung Woo Choi
Seung Nam CHOI
Jung Pil CHOI

Assignees

ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Dates

Publication Date: 20260505
Application Date: 20211105
Priority Date: 20201109

Claims (14)

1 . An operation method of a first communication node in a communication system, the operation method comprising: transmitting a reference signal to one or more candidate relay (R) nodes; receiving first feedback information including a minimum value of a first reference signal received power (RSRP) from a first candidate R node belonging to the one or more candidate R nodes; receiving second feedback information including a minimum value of a second RSRP from a second candidate R node belonging to the one or more candidate R nodes; comparing a first value based on the first feedback information with a second value based on the second feedback information; selecting the first candidate R node as an R node to perform a relay operation when the first value is greater than the second value; and communicating with a second communication node through the R node, wherein the first candidate R node satisfies a condition that a first power value is equal to or less than a second power value, the first power value means a transmit power difference between the first communication node and the second communication node, and the second power value means a maximum received power difference in which a signal distortion does not occur due to a power imbalance between signals received by the first candidate R node from the first communication node and the second communication node.
2 . The operation method according to claim 1 , wherein the first value means an average value for a time t, and the time t means a time from when the reference signal is transmitted to when the first feedback information and the second feedback information are received.
3 . The operation method according to claim 1 , wherein the second value means an average value for a time t, and the time t means a time from when the reference signal is transmitted to when the first feedback information and the second feedback information are received.
4 . The operation method according to claim 1 , wherein the second candidate R node satisfies a condition that a third power value is equal to or less than a fourth power value, the third power value means a transmit power difference between the first communication node and the second communication node, and the fourth power value means a maximum received power difference in which a signal distortion does not occur due to a power imbalance between signals received by the second candidate R node from the first communication node and the second communication node.
5 . The operation method according to claim 1 , further comprising: transmitting first data to the R node; receiving second data from the R node; and performing an exclusive-OR (XOR) operation on the first data and the second data, wherein the first data is data transmitted to the second communication node, and the second data is a result of an XOR operation on the first data and third data transmitted from the second communication node.
6 . An operation method of a relay (R) node in a communication system, the operation method comprising: receiving a reference signal from a first communication node; transmitting first feedback information for the reference signal to the first communication node; receiving first data from the first communication node; receiving third data from a second communication node; performing an XOR operation on the first data and the third data; and transmitting second data resulting from the XOR operation to the first communication node and the second communication node, wherein the R node is a candidate R node satisfying a condition that a first power value is equal to or less than a second power value, the first power value means a transmit power difference between the first communication node and the second communication node, and the second power value means a maximum received power difference in which a signal distortion does not occur due to a power imbalance between signals received by the candidate R node from the first communication node and the second communication node.
7 . The operation method according to claim 6 , wherein the R node is one candidate R node selected based on the first feedback information among one or more candidate R nodes receiving the reference signal from the first communication node.
8 . The operation method according to claim 6 , wherein the first feedback information includes a first value, the first value means an average value for a time t of a minimum value of first reference signal received power (RSRP), and the time t means a time from when the reference signal is received to when the first feedback information is transmitted.
9 . The operation method according to claim 6 , wherein in the transmitting of the second data, a power of a signal transmitted to the first communication node and a power of a signal transmitted to the second communication node are allocated equally.
10 . A first communication node in a communication system, the first communication node comprising: a processor; a memory electronically communicating with the processor; and instructions stored in the memory, wherein when executed by the processor, the instructions cause the first communication node to: transmit a reference signal to one or more candidate relay (R) nodes; receive first feedback information including a minimum value of a first reference signal received power (RSRP) from a first candidate R node belonging to the one or more candidate R nodes; receive second feedback information including a minimum value of a second RSRP from a second candidate R node belonging to the one or more candidate R nodes; compare a first value based on the first feedback information with a second value based on the second feedback information; select the first candidate R node as an R node to perform a relay operation when the first value is greater than the second value; and communicate with a second communication node through the R node, wherein the first candidate R node satisfies a condition that a first power value is equal to or less than a second power value, the first power value means a transmit power difference between the first communication node and the second communication node, and the second power value means a maximum received power difference in which a signal distortion does not occur due to a power imbalance between signals received by the first candidate R node from the first communication node and the second communication node.
11 . The first communication node according to claim 10 , wherein the first value means an average value for a time t, and the time t means a time from when the reference signal is transmitted to when the first feedback information and the second feedback information are received.
12 . The first communication node according to claim 10 , wherein the second value means an average value for a time t, and the time t means a time from when the reference signal is transmitted to when the first feedback information and the second feedback information are received.
13 . The first communication node according to claim 10 , wherein the second candidate R node satisfies a condition that a third power value is equal to or less than a fourth power value, the third power value means a transmit power difference between the first communication node and the second communication node, and the fourth power value means a maximum received power difference in which a signal distortion does not occur due to a power imbalance between signals received by the second candidate R node from the first communication node and the second communication node.
14 . The first communication node according to claim 10 , wherein in the communicating with the second communication node, the instructions further cause the first communication node to: transmit first data to the R node; receive second data from the R node; and perform an exclusive-OR (XOR) operation on the first data and the second data, wherein the first data is data transmitted to the second communication node, and the second data is a result of an XOR operation on the first data and third data transmitted from the second communication node.

Description

TECHNICAL FIELD The present disclosure relates to a data relay technique, and more particularly, to selection of a relay in a two-way relay (TWR) scheme, and relay communication techniques for the same. BACKGROUND ART Communication may be performed based on the 5G communication technology, wireless broadband (WiBro) technology, wireless local area network (WLAN) technology, wireless personal area network (WPAN) technology, and the like. A base station may be connected to a core network through a wired backhaul (BH) or a wireless backhaul. For example, the base station may transmit data and control information received from a terminal to the core network through the wired backhaul or wireless backhaul. In addition, the base station may receive data and control information from the core network through the wired backhaul or wireless backhaul. In particular, demand for a wireless backhauling technology that can replace optical cables at a low cost is increasing, and an integrated access and backhaul (IAB) technology is emerging for this purpose. The IAB technology is a technology that enables flexible and dense deployment of new radio (NR) cells by using nodes that support wireless backhaul links and access links in an integrated manner. In particular, it may be a solution that reduces the cost of constructing wired backhaul links for cell-to-cell communication in a high-density cell deployment environment due to reduced cell coverages while utilizing a high frequency band, and enables flexible cell deployment. However, in a TWR communication scheme, which is one of relay communication schemes of the IAB network that utilizes a plurality of IAB nodes to provide relay-based data links, a method of selecting an optimal relay node among a plurality of relay IAB nodes may become a problem. DISCLOSURE Technical Problem The present disclosure is directed to providing a method of selecting an optimal relay IAB node in an IAB network, and a relay communication method using the selected IAB node. Technical Solution According to a first exemplary embodiment of the present disclosure for achieving the objective, an operation method of a first communication node may comprise: transmitting a reference signal to one or more candidate relay (R) nodes; receiving first feedback information including a minimum value of a first reference signal received power (RSRP) from a first candidate R node belonging to the one or more candidate R nodes; receiving second feedback information including a minimum value of a second RSRP from a second candidate R node belonging to the one or more candidate R nodes; comparing a first value based on the first feedback information with a second value based on the second feedback information; selecting the first candidate R node as an R node to perform a relay operation when the first value is greater than the second value; and communicating with the second communication node through the R node. The first value may mean an average value for a time t, and the time t may mean a time from when the reference signal is transmitted to when the first feedback information and the second feedback information are received. The second value may mean an average value for a time t, and the time t may mean a time from when the reference signal is transmitted to when the first feedback information and the second feedback information are received. The first candidate R node may satisfy a condition that a first power value is equal to or less than a second power value, the first power value may mean a transmit power difference between the first communication node and the second communication node, and the second power value may mean a maximum received power difference in which a signal distortion does not occur due to a power imbalance between signals received by the first candidate R node from the first communication node and the second communication node. The second candidate R node may satisfy a condition that a third power value is equal to or less than a fourth power value, the third power value may mean a transmit power difference between the first communication node and the second communication node, and the fourth power value may mean a maximum received power difference in which a signal distortion does not occur due to a power imbalance between signals received by the second candidate R node from the first communication node and the second communication node. The operation method may further comprise: transmitting first data to the R node; receiving second data from the R node; and performing an exclusive-OR (XOR) operation on the first data and the second data, wherein the first data is data transmitted to the second communication node, and the second data is a result of an XOR operation on the first data and third data transmitted from the second communication node. According to a second exemplary embodiment of the present disclosure for achieving the objective, an operation method of a relay (R) node ma