TECHNICAL FIELD

The disclosure relates to a network technology, in particular to a synchronization method, apparatus for a relay system, a computer device and a storage medium.

BACKGROUND

In Long Term Evolution (LTE) system, backhaul links between a base station and another base station and between a base station and a core network adopt wired connections, which brings greater deployment difficulty and higher network distribution cost to operators.

In order to solve the above problems, 3rdgeneration partnership project (3GPP) initiates research on a wireless relay technology in the standardization phase of Long Term Evolution-Advanced (LTE-A) to provide a solution of wireless backhaul link.

A Relay Node (RN) is wirelessly connected to a home cell to which the RN belongs, the home cell is called a Donor cell, and a home base station of the RN is called a Donor eNB, i.e., a DeNB.

FIG. 1is a schematic diagram of structure of an existing network in which an RN is introduced. As shown inFIG. 1, there are three wireless links: a backhaul link between an RN and a DeNB, an access link between a user equipment (UE) and an RN, and a direct link between a UE and an eNB.

In a relay system, an upper level node of a node is referred to a parent node of the node, and a next level is referred to a child node of the node. As shown inFIG. 1, for the RN, the DeNB is a parent node of the RN and the UE is a child node the RN.FIG. 2is a schematic diagram of an existing relay system supporting multiple hops. As shown inFIG. 2, for RN1, DeNB is a parent node of RN1, RN2is a child node of RN1, and for RN2, RN1is a parent node of RN2, and UE is a child node of RN2.

The RN receives downlink data from the parent node and sends uplink data to the parent node on the backhaul link. In addition, the RN also sends downlink data to the child node and receives uplink data from the child node on the access link. Therefore, in the relay system, how to determine sending time of data is a very critical and important issue.

SUMMARY

In view of above problem, the present disclosure provides a synchronization method and apparatus for a relay system, computer device and storage medium.

Specific technical solutions are as follows.

A synchronization method for a relay system includes:

a relay node determines a first time slot boundary, and the relay node sends downlink data to a child node in a mode that a second time slot boundary of sending downlink data to the child node is time aligned with the first time slot boundary.

A synchronization method for a relay system includes:

a relay node determines a first timing advance according to at least the following information: a second timing advance for the relay node to send uplink data to a parent node and a transmission time delay between the relay node and a child node, and the relay node sends the first timing advance to the child node, wherein the first timing advance is used for the child node to determine sending time for sending uplink data to the relay node.

A synchronization method for a relay system includes:

a first device acquires a first timing advance, wherein the first timing advance is determined according to at least following information: a second timing advance for a second device to send uplink data to a third device and a transmission time delay between the second device and the first device, and the first device determines sending time for sending uplink data to the second device according to the first timing advance, wherein the second device is a parent node of the first device and the third device is a parent node of the second device.

A synchronization device for a relay system includes a time slot boundary determination unit and a downlink data sending unit.

Herein, the time slot boundary determination unit is configured to determine a first time slot boundary, and the downlink data sending unit is configured to send downlink data to a child node in a mode that a second time slot boundary of sending downlink data to the child node is time aligned with the first time slot boundary.

A synchronization device for a relay system includes a timing advance configuration unit.

The timing advance configuration unit is configured to determine a first timing advance according to at least the following information: a second timing advance of the synchronization device for the relay system to send uplink data to a parent node and a transmission time delay between the synchronization device for the relay system and a child node, and send the first timing advance to the child node, wherein the first timing advance is used for the child node to determine sending time for sending uplink data to the synchronization device for the relay system.

A synchronization device for a relay system includes a timing advance acquisition unit and an uplink data sending unit.

The timing advance acquisition unit is configured to acquire a first timing advance, wherein the first timing advance is determined according to at least the following information: a second timing advance for a second device to send uplink data to a third device and a transmission time delay between the second device and the synchronization device for the relay system, herein, the second device is a parent node of the synchronization device for the relay system, and the third device is a parent node of the second device.

The uplink data sending unit is configured to determine sending time for sending uplink data to the second device according to the first timing advance.

A computer device includes a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the methods as described above when executing the computer program.

A computer readable storage medium storing a computer program, when the computer program is executed by a processor, the above mentioned methods are implemented.

