CN102137500B - Method, base station and system for data transmission - Google Patents

Abstract

The invention discloses a data transmission method, a base station and a system, belonging to the technical field of communication. The method includes: in a TDD network, for a cell where a relay node is deployed, the base station of the cell takes the initial timeline of the network as a reference, and keeps the uplink subframe of the timeline of the cell and the uplink part of the special subframe different from each other. Change, reconfigure the length of the guard time in the special subframe of the timeline of the cell, and use the downlink subframe of the initial timeline and the downlink part of the special subframe as a reference, delay the length of the timeline after the reconfiguration of the guard time of the cell The downlink subframe and the downlink part of the special subframe get a new timeline, and perform data transmission with the UE or the relay node according to the new timeline. The base station includes: a processing module and a sending module. The system includes: a base station and a relay node. In the embodiment of the present invention, interference is avoided by adjusting the guard time and the downlink timeline of the timeline of the cell where the relay node is deployed.

Description

Method, base station and system for transmitting data

technical field

The present invention relates to the field of communication technology, in particular to a data transmission method, base station and system.

Background technique

In a TDD (Time Division Duplex, Time Division Duplex) network, the use of relay technology (Relaying) can provide good user coverage and data throughput. At the same time, when the relay backhaul link between the eNB (enhanced Node Base, base station) and the relay relay node, and the relay connection between the relay node and the UE (User Equipment, user equipment) it serves Incoming links, when using the same frequency band or adjacent frequency bands for communication, if the relay node sends and receives at the same time, the signal sent by the relay node will be received by the relay node itself, thus forming a received signal to the relay node interference, which brings the problem of self-backhaul interference.

In order to avoid loopback self-interference, the time when the relay node receives the data sent by the UE it serves and the time when the relay node sends data to the base station where it is located need to be staggered; the time when the relay node sends data to the UE it serves is staggered The time when the relay node receives the data sent by the base station also needs to be staggered. In this way, the relay node will not simultaneously receive and transmit in the same frequency band at any time, so there will be no loopback self-interference problem.

In a communication system, data is assembled and transmitted in units of subframes. In the TDD system, there are three types of subframe structures: downlink subframe (D), uplink subframe (U) and special subframe (S). For the base station, the downlink subframe is used to transmit data to the UE, and the uplink subframe is used to receive data from the UE or the relay node. The special subframe is used to transition from a downlink subframe to an uplink subframe, and includes a downlink part Dw, a guard time GP, and an uplink part Up, wherein the lengths of the downlink part Dw and the guard time GP are configurable. The above three subframes are combined in a certain order to form a timeline structure. Among them, all the downlink parts in the timeline structure, including downlink subframes and downlink parts in special subframes, constitute a structure called downlink timeline, and all uplink parts in this timeline structure, including uplink subframes and special subframes The structure of the upstream part is called the upstream timeline.

In the TDD cellular network where the relay node is deployed, after the downlink timeline of the cell where the relay node is located reaches the relay node after the propagation delay, the relay node takes the arrival timeline as a reference and advances for a period of time on this basis. As the downlink timeline of the relay node, the control data part in the downlink subframe of the relay node and the control data part in the downlink subframe when the base station arrives at the relay are staggered, so that the relay can control the UE it serves The data is sent out, and the control data given to it by the base station can be received. However, after the downlink timeline of the relay node is advanced, the control data transmitted by the relay node may overlap with the uplink receiving part of the base station when it arrives at the base station, and interference will still be generated.

Contents of the invention

In order to solve the problems in the prior art, embodiments of the present invention provide a data transmission method, base station and system. Described technical scheme is as follows:

A method of transmitting data, the method comprising:

In a time-division duplex network, for a cell where a relay node is deployed, the base station of the cell takes the initial timeline of the network as a reference, and maintains the uplink subframe of the timeline of the cell and the uplink subframe of the special subframe Part remains unchanged, reconfigure the length of the guard time in the special subframe of the timeline of the cell, and use the downlink subframe of the initial timeline of the network and the downlink part of the special subframe as a reference to delay the cell The downlink subframe and the downlink part in the special subframe of the timeline after reconfiguring the guard time to obtain a new timeline of the cell;

The base station performs data transmission with the user equipment or the relay node according to the new timeline;

Wherein, reconfiguring the length of the guard time in the special subframe of the timeline of the cell includes:

The sum of the downlink part in the special subframe and the length of the guard time is kept unchanged, and the length of the guard time is extended.

A base station is located in a time-division duplex network, and a relay node is deployed in a cell served by the base station, and the base station includes:

A processing module, configured to use the initial timeline of the network as a reference, keep the uplink subframe of the timeline of the cell and the uplink part of the special subframe unchanged, and reconfigure the special subframe of the timeline of the cell The length of the guard time, and taking the downlink subframe and the downlink part of the special subframe of the initial timeline of the network as a reference, delay the downlink subframe and the special subframe of the timeline after the reconfiguration guard time of the cell In the downlink part, the new timeline of the cell is obtained;

a sending module, configured to perform data transmission with the user equipment or the relay node according to the new timeline;

Wherein, the processing module reconfigures the length of the guard time in the special subframe of the timeline of the cell, including:

The sum of the downlink part in the special subframe and the length of the guard time is kept unchanged, and the length of the guard time is extended.

A system for transmitting data, the system is located in a time-division duplex network, including: a base station and a relay node, and the relay node is deployed in a cell served by the base station;

The base station is configured to use the initial timeline of the network as a reference, keep the uplink subframe of the timeline of the cell and the uplink part of the special subframe unchanged, and reconfigure the special subframe of the timeline of the cell The length of the middle guard time, and taking the downlink subframe and the downlink part of the special subframe of the initial timeline of the network as a reference, delay the downlink subframe and the special subframe of the timeline after the reconfiguration guard time of the cell The downlink part in the frame is used to obtain the new timeline of the cell; it is also used to perform data transmission with the user equipment or the relay node according to the new timeline;

The relay node is configured to use the arrival time of the downlink part as a reference and use the time specified in advance as the time of the relay node when the downlink part of the new timeline of the base station propagates to the relay node The position of the downlink part of the line, so that the control data part in the downlink subframe of the timeline of the relay node and the control data part in the downlink subframe of the new timeline of the base station are not the same after arriving at the relay node Overlapping is also used to perform data transmission with the base station or user equipment according to a timeline specified in advance;

Wherein, the base station reconfigures the length of the guard time in the special subframe of the timeline of the cell, including:

The sum of the downlink part in the special subframe and the length of the guard time is kept unchanged, and the length of the guard time is extended.

In the embodiment of the present invention, the purpose of eliminating interference is achieved by adjusting the timeline of the cells where relay nodes are deployed, without adjusting the timeline of cells without relay nodes, and avoiding the need to adjust the timeline of all cells in the network The timeline is adjusted, which greatly saves resources, avoids waste of resources, and reduces maintenance costs and complexity.

Description of drawings

FIG. 1 is a schematic diagram of a timeline structure provided by an embodiment of the present invention;

Fig. 2 is a flowchart of a data transmission method provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of timeline alignment of two cells provided by an embodiment of the present invention;

FIG. 4 is a detailed flowchart of a data transmission method provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of each timeline in the method for transmitting data provided by an embodiment of the present invention;

FIG. 6 is a structural diagram of a base station provided by an embodiment of the present invention;

Fig. 7 is a structural diagram of a data transmission system provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The timeline in the embodiment of the present invention is shown in FIG. 1 , including a downlink subframe D, a special subframe S and an uplink subframe U. Wherein, a downlink subframe can be divided into two parts in time, the front part is the control data part, which is shown as a cross hatched part in the figure, and the back part is the downlink service data part, which is shown as a blank part in D in the figure. The special subframe can be divided into three parts. The front part is the downlink part Dw, including the downlink control data part and the downlink service data part. It has the same structure as the downlink subframe. The middle part is a guard time GP, and the back part is the uplink part Up. A special subframe is required when transitioning from a downlink subframe to an uplink subframe. The length of the uplink part of the special subframe is relatively fixed, and the length of the downlink part and the guard time can be adjusted mutually. The sum of the two lengths is the total length of the special subframe minus the length of the uplink part. The interval between the starting positions of any two uplink subframes or downlink subframes is an integer number of subframes; consecutive downlink subframes, including the downlink part of special subframes, and consecutive uplink subframes, including special subframes The upstream portion of a frame, with no gaps in between.

Referring to FIG. 2, an embodiment of the present invention provides a timing control method, including:

201: In a TDD network, for a cell where a relay node is deployed, the base station of the cell takes the initial timeline of the TDD network as a reference, and keeps the uplink subframe and the uplink part of the special subframe of the timeline of the cell unchanged, Reconfigure the length of the guard time in the special subframe of the timeline of the cell, and refer to the downlink subframe of the initial timeline of the TDD network and the downlink part of the special subframe to delay the reconfiguration of the guard time of the cell The downlink subframe of the timeline and the downlink part of the special subframe obtain a new timeline of the cell.

The initial timeline in the embodiment of the present invention refers to the same timeline set for all cells in the TDD network initially. The length of the guard time GP of the special subframe has been configured in the initial timeline. If no relay nodes are deployed in the TDD network, the timelines of all cells are absolutely time-aligned, that is, from the perspective of natural time, the boundaries of each subframe in all cells are aligned, and all are downlink subframes , or are all uplink subframes, or are all special subframes. As shown in FIG. 3 , the timelines of cell A and cell B are aligned in absolute time. Otherwise, if cell A is the uplink part, and cell B is the downlink part at the same time, then cell A will receive the terminal uplink data of its own cell and the downlink data of the base station of cell B at the same time, and what cell A wants is only the uplink of the terminal of its own cell data, the downlink data of cell B will constitute interference.

The length configuration of the guard time GP is generally determined by the size of each cell, or equivalently, by the distance between base stations corresponding to two cells. The basic requirement is: when the downlink data transmission of cell A, including the downlink subframe and the downlink part of the special subframe, reaches cell B after the propagation delay, it cannot receive the uplink data of cell B, including the uplink subframe and the special subframe. The uplink part of the frame overlaps, otherwise there is interference. Assuming that the distance between the base station of cell A and the base station of cell B is L (meters), that is, the radius of each cell is about L/2 meters, and the propagation speed of wireless electromagnetic waves is C=3.0*10 ⁸ m/s, then the protection time GP is at least For L/C seconds. Generally, in order to improve resource utilization, it is best for the GP to meet the requirement of no interference, so that the downlink part Dw of the special subframe is as long as possible for data transmission.

202: The base station of the cell performs data transmission with the UE or the relay node according to the new timeline obtained above, where the transmission includes sending and receiving.

The above method achieves the purpose of eliminating interference by adjusting the timeline of the cell where the relay node is deployed, and does not need to adjust the timeline of the cell without the relay node, avoiding the interference of all cells in the network. The timeline is adjusted, which greatly saves resources, avoids waste of resources, and reduces maintenance costs and complexity.

In the above method, specifically, 201 can be implemented in the following manner: reconfigure the guard time GP and delay the downlink subframe and the downlink part of the special subframe in the timeline after the reconfigured guard time of the cell, so that the new When the downlink subframe of the timeline and the downlink part of the special subframe arrive at the adjacent cell through the delay, it does not overlap with the uplink subframe of the timeline of the adjacent cell and the uplink part of the special subframe, and makes the adjacent cell When the downlink subframe of the timeline and the downlink part of the special subframe arrive at the cell after a delay, it does not overlap with the uplink subframe of the new timeline of the cell and the uplink part of the special subframe, which also makes the timeline of the relay node When the downlink control data part in the downlink subframe reaches the cell after a delay, it does not overlap with the uplink subframe of the new timeline of the cell and the uplink part of the special subframe.

Referring to FIG. 4, the timing control method provided by the embodiment of the present invention may specifically include:

401: For a cell where a relay node is deployed in a TDD network, the base station of the cell takes the initial timeline of the TDD network as a reference, keeps the uplink subframe and the uplink part of the special subframe of the timeline of the cell unchanged, and reconfigures The length of the guard time in the special subframe of the timeline of the cell, and with reference to the downlink subframe of the initial timeline of the TDD network and the downlink part of the special subframe, the timeline after delaying the reconfiguration guard time of the cell The downlink subframe of the downlink subframe and the downlink part of the special subframe obtain the new timeline of the cell, so that when the downlink subframe of the new timeline of the cell and the downlink part of the special subframe reach the adjacent cell through the delay, the The uplink subframe of the timeline of the adjacent cell and the uplink part of the special subframe do not overlap, and when the downlink subframe of the timeline of the adjacent cell and the downlink part of the special subframe arrive at the cell through a delay, the The uplink subframe of the new timeline and the uplink part of the special subframe do not overlap, and the downlink control data part in the downlink subframe of the timeline of the relay node arrives at the cell through delay, and the new time of the cell The uplink subframe of the line and the uplink part of the special subframe do not overlap.

Wherein, the initial timeline of the TDD network is usually preset, and setting the initial timeline includes setting the length of the guard time GP of the special subframe therein. Specifically, refer to the TDD initial network timeline in FIG. 5 , that is, the timeline structure in the first row. Typically, the timelines of all cells in a TDD network are aligned in absolute time initially.

In this embodiment, specifically, the length of the guard time GP is extended, that is, the length of the downlink part Dw in the special subframe is shortened, and the sum of the lengths of GP and Dw remains unchanged, as shown in Figure 5. The timeline after Dw/GP is reconfigured in the cell, that is, the timeline structure in the second row.

Preferably, the length of the guard time GP in the special subframe configuring the timeline of the cell is at least: (Tc+τ-2*Tp+L/C) seconds; wherein, Tc is the control in the downlink subframe of the relay node The length of the data part, τ is the transition time of the relay node from the sending state to the receiving state, and Tp is the propagation delay from the base station of the cell to the relay node. L is the distance between the base station of one cell and the base station of another cell, in meters, C is the propagation speed of wireless electromagnetic waves, and C=3.0*10 ⁸ m/s. The time τ is due to hardware considerations. It is impossible for the relay node to switch from the sending state to the receiving state immediately, and it needs a certain conversion time. time. In this embodiment, τ is a number greater than 0. With the development of technology, the value of τ can reach 0. When τ is 0, it is still applicable to the technical solution in the embodiment of the present invention.

The purpose of extending the length of the guard time in this step is to prevent the situation that the GP is too short caused by delaying the downlink subframe and the downlink part of the special subframe on the premise that the uplink part of the special subframe and the uplink subframe remain unchanged.

In this embodiment, when there are multiple relay nodes deployed in the cell, a time is calculated for each relay node in the multiple relay nodes according to the above formula: (Tc+τ-2*Tp) seconds value, select the maximum value from all the obtained time values, and delay the downlink subframe and the downlink part of the special subframe of the time line of the cell by at least the maximum value.

Preferably, the downlink subframe and the downlink part of the special subframe in the timeline after delaying the reconfiguration protection time of the cell are at least (Tc+τ-2*Tp) seconds; wherein, Tc is the downlink subframe of the relay node The length of the control data part in the frame, τ is the transition time of the relay node from the sending state to the receiving state, and Tp is the propagation delay from the base station of the cell to the relay node. Specifically, you can refer to the timeline structure in which the uplink time of the cell where the relay node is deployed and the downlink time is delayed after the fixed uplink time in FIG. 5 , that is, the structure of the third timeline in the figure. In the figure, the delay is not considered in the case of Tp. At this time, Tp=0, Up and U remain unchanged, and each D and Dw are delayed backwards. Therefore, the first D and Dw in the figure are delayed Finally, the length of the GP in the special subframe is shortened, and the GP shown in the left slanted shaded part in the figure, correspondingly, after the delay of the D subframe following the U subframe, there is a corresponding GP in front of it, In the figure, the GP shown as the shaded part of the right slanted line, the sum of the lengths of the two GPs is equal to the length of the GP before the delay (the GP in the second row).

In this embodiment, when there are multiple relay nodes deployed in the above cell, according to the above formula: (Tc+τ-2*Tp+L/C) seconds is the time for each relay node in the multiple relay nodes The node calculates a time value, selects the maximum value from all the obtained time values, and delays the length of the guard time in the special subframe of the timeline after the reconfigured guard time of the cell by at least the maximum value.

402: The base station of the cell performs data transmission with the UE or the relay node according to the new timeline, and the transmission includes sending and receiving.

In this embodiment, since the relay node is deployed in the above cell, the cell that the relay node serves as the base station identity also has its own timeline. At this time, its timeline cannot be aligned with the timeline of the base station where it is located, because for the base station where it is located, it is the identity of the UE. Moreover, in the downlink subframe of its own cell, the relay node must first complete sending the control data part in the downlink subframe of its own cell to the UE it serves, and then complete receiving the data sent to it by the base station, including the control data part and The service data part, so the control data part of the relay node needs to be staggered with the control data part of the base station. Therefore, further, the above method may also include:

403: When the downlink part of the new timeline of the base station of the above-mentioned cell arrives at the relay node, the relay node takes the arrival time of the downlink part as a reference, and uses the time specified in advance as the downlink part of the timeline of the relay node position, obtain the new timeline of the relay node, so that the control data part in the downlink subframe of the timeline of the relay node does not overlap with the control data part in the downlink subframe of the new timeline of the base station after reaching the relay node, Further, the relay node performs data transmission with the base station and the UE according to its own new timeline, and the transmission includes receiving and sending.

Specifically, referring to Fig. 5, the timeline structure in the fourth row is the result of the base station in the cell where the relay node is deployed above sends data according to the new timeline, and the new timeline reaches the relay node. There is a delay in , so the new timeline will be extended backwards for a period of time after it arrives. The fifth row of the timeline structure in the figure is the new timeline obtained after the relay node advances the downlink part. Since the relay node takes the arrival time of the downlink part of the new timeline of the base station as a reference, it can be seen from the figure that Compared with the result after the new timeline of the base station in the fourth row in the figure reaches the relay node, the new timeline of the relay node in the fifth row in the figure is earlier by a period of time. Through this advance, the control data part in the downlink subframe of the timeline of the relay node does not overlap with the control data part of the downlink subframe of the timeline of the base station.

In this embodiment, the application scenario may also be an LTE (Long Term Evolution, 3GPP Long Term Evolution)/LTE-A (Long Term Evolution Advanced, Advanced Long Term Evolution) TDD network. In this TDD network, the length of a subframe is 1 millisecond , and consists of 14 OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) symbols. Wherein, the values of Dw, GP and Up of the special subframe are specifically an integer number of symbol lengths. In addition, the length of the control data part of the subframe in which the relay node receives the base station data is 1 or 2 symbols. Assuming that the maximum length of the control data part in the subframes used by all relay nodes in the cell to receive the base station data is k (k=1, 2) symbols, and the distance between the base stations of the two cells in the TDD network is L meters, then preferably Therefore, the total length of the reconfigured GP of the cell is at least k symbol length+τ+L/C seconds, where τ is the transition time of the relay node from the transmitting state to the receiving state, C is the propagation speed of the wireless electromagnetic wave, And C=3.0*10 ⁸ m/s.

The above method provided by this embodiment achieves the purpose of eliminating interference by adjusting the timeline of the cell where the relay node is deployed, and does not need to adjust the timeline of the cell where the relay node is not deployed. The timelines of all communities are adjusted, which greatly saves resources, avoids waste of resources, reduces maintenance costs and complexity, and is simple to operate and easy to implement. For a cell without a relay node, there is no need to adjust the timeline of the cell, and the timeline of the cell without a relay node will not be affected in any way, so that these cells do not waste resources, and the maintenance complexity of the entire network is reduced. Extending the length of the GP can prevent the situation that the GP is too short caused by extending the downlink subframe and the downlink part of the special subframe on the premise that the uplink part of the special subframe and the uplink subframe remain unchanged. The cell delays the downlink subframe and the downlink part of the special subframe, so that when the control data part of the downlink subframe sent by the relay node reaches the base station, it will not overlap with the uplink receiving part of the base station, thereby avoiding interference. After the relay node advances the downlink part, the control data part in the downlink subframe of the timeline of the relay node does not overlap with the control data part of the downlink subframe of the timeline of the base station to avoid interference.

Referring to FIG. 6, an embodiment of the present invention also provides a base station, which is located in a TDD network, and a relay node is deployed in a cell served by the base station, and the base station includes:

The processing module 601 is configured to use the initial timeline of the TDD network as a reference, keep the uplink subframe of the timeline of the cell and the uplink part of the special subframe unchanged, and reconfigure the protection time in the special subframe of the timeline of the cell , and taking the downlink subframe and the downlink part of the special subframe of the initial timeline of the TDD network as a reference, delay the downlink subframe of the timeline and the downlink part of the special subframe after the reconfiguration protection time of the cell , get the new timeline of the cell;

The sending module 602 is configured to perform data transmission with the UE or the above-mentioned relay node according to the new timeline obtained by the processing module 601 . Wherein, the transmission includes receiving and sending.

In this embodiment, in the first implementation manner, the processing module 601 may be used to:

Delaying the downlink subframe and the downlink part in the special subframe of the timeline after the reconfiguration guard time of the cell is at least (Tc+τ-2*Tp) seconds; and/or,

Configure the length of the guard time in the special subframe of the timeline of the cell to be at least: (Tc+τ-2*Tp+L/C) seconds;

Among them, Tc is the length of the control data part in the downlink subframe of the relay node, τ is the transition time of the relay node from the transmitting state to the receiving state, Tp is the propagation delay from the base station of the cell to the relay node, L is the distance between the base station of one cell and the base station of another cell, in meters, C is the propagation speed of wireless electromagnetic waves, and C=3.0*10 ⁸ m/s.

In this embodiment, in the second implementation manner, the processing module 601 may be used to:

When there are multiple relay nodes deployed in the cell, a time value is calculated for each relay node according to (Tc+τ-2*Tp) seconds, and the maximum value is selected from all the obtained time values, and the The downlink subframe of the timeline after the reconfiguration guard time of the cell and the downlink part of the special subframe are delayed by at least the maximum value; and/or,

When there are multiple relay nodes deployed in the cell, calculate a time value for each relay node according to (Tc+τ-2*Tp+L/C) seconds, and select the largest time value from all the obtained time values value, the length of the guard time in the special subframe of the cell's timeline is delayed by at least the maximum value;

Among them, Tc is the length of the control data part in the downlink subframe of the relay node, τ is the transition time of the relay node from the transmitting state to the receiving state, Tp is the propagation delay from the base station of the cell to the relay node, L is the distance between the base station of one cell and the base station of another cell, in meters, C is the propagation speed of wireless electromagnetic waves, and C=3.0*10 ⁸ m/s.

In this embodiment, the processing module 601 is specifically configured to use the initial timeline of the TDD network as a reference, keep the uplink subframe of the timeline of the cell and the uplink part of the special subframe unchanged, and reconfigure the special subframe of the timeline of the cell. The length of the guard time in the subframe, and taking the downlink subframe and the downlink part of the special subframe of the initial timeline of the TDD network as a reference, delay the downlink subframe and the special subframe of the timeline after the reconfiguration guard time of the cell The downlink part in the frame, to get the new timeline of the cell, so that when the downlink subframe of the new timeline of the cell and the downlink part of the special subframe reach the adjacent cell through the delay, the timeline of the adjacent cell The uplink subframe and the uplink part of the special subframe do not overlap, and when the downlink subframe of the timeline of the adjacent cell and the downlink part of the special subframe arrive at the cell through a delay, it is different from the uplink subframe of the new timeline of the cell. The uplink part of the frame and the special subframe do not overlap, and when the downlink control data part in the downlink subframe of the timeline of the relay node arrives at the cell through a delay, it is different from the uplink subframe and the special subframe of the new timeline of the cell. The uplink parts of the subframes do not overlap.

The above-mentioned base station provided by this embodiment achieves the purpose of eliminating interference by adjusting the timeline of the cell where the relay node is deployed, and does not need to adjust the timeline of the cell where the relay node is not deployed. The timelines of all communities are adjusted, which greatly saves resources, avoids waste of resources, reduces maintenance costs and complexity, and is simple to operate and easy to implement. For a cell without a relay node, there is no need to adjust the timeline of the cell, and the timeline of the cell without a relay node will not be affected in any way, so that these cells do not waste resources, and the maintenance complexity of the entire network is reduced. Extending the length of the GP can prevent the situation that the GP is too short caused by extending the downlink subframe and the downlink part of the special subframe on the premise that the uplink part of the special subframe and the uplink subframe remain unchanged. The cell delays the downlink subframe and the downlink part of the special subframe, so that when the control data part of the downlink subframe sent by the relay node reaches the base station, it will not overlap with the uplink receiving part of the base station, thereby avoiding interference.

Referring to FIG. 7, an embodiment of the present invention also provides a system for transmitting data, including: a base station 701 and a relay node 702;

The base station 701 is used to keep the uplink subframe and the uplink part of the special subframe of the timeline of the cell unchanged for the cell where the relay node 702 is deployed in the TDD network, taking the initial timeline of the TDD network as a reference, Reconfigure the length of the guard time in the special subframe of the timeline of the cell, and refer to the downlink subframe of the initial timeline of the TDD network and the downlink part of the special subframe to delay the reconfiguration of the guard time of the cell The downlink subframe of the timeline and the downlink part of the special subframe obtain a new timeline of the cell; it is also used for data transmission with the UE or the relay node 702 according to the new timeline;

The relay node 702 is used to, in the TDD network, when the downlink part of the new timeline of the base station 701 propagates to the relay node 702, take the arrival time of the downlink part as a reference, and use the time specified in advance as the time of the relay node 702 The position of the downlink part of the line is such that the control data part in the downlink subframe of the timeline of the relay node 702 does not overlap with the control data part in the downlink subframe of the new timeline of the base station 701 after reaching the relay node, and also It is used to perform data transmission with the base station 701 or the UE according to the timeline specified in advance.

In this embodiment, the foregoing transmission includes receiving and sending.

In this embodiment, specifically, the base station 701 is used to keep the uplink subframe and the special subframe of the timeline of the cell in the TDD network, taking the initial timeline of the TDD network as a reference for the cell where the relay node 702 is deployed. The uplink part of the frame remains unchanged, reconfigure the length of the guard time in the special subframe of the timeline of the cell, and refer to the downlink subframe of the initial timeline of the TDD network and the downlink part of the special subframe to delay the cell The downlink subframe and the downlink part of the special subframe in the timeline after the reconfiguration of the guard time, get the new timeline of the cell, so that the downlink subframe and the downlink part of the special subframe of the new timeline of the cell pass through the delay When arriving at a neighboring cell, it does not overlap with the uplink subframe of the timeline of the neighboring cell and the uplink part of the special subframe, and makes the downlink subframe of the timeline of the neighboring cell and the downlink part of the special subframe pass through the delay When arriving at the cell, it does not overlap with the uplink subframe of the new timeline of the cell and the uplink part of the special subframe, and also makes the downlink control data part of the downlink subframe of the timeline of the relay node 702 arrive at the cell through a delay When using a cell, it does not overlap with the uplink subframe of the new timeline of the cell and the uplink part of the special subframe.

The base station 701 in this embodiment also has all the functions of the base station in the foregoing embodiments, which will not be repeated here.

The above-mentioned system provided by this embodiment achieves the purpose of eliminating interference by adjusting the timeline of the cell where the relay node is deployed, and does not need to adjust the timeline of the cell without the relay node, avoiding The timelines of all communities are adjusted, which greatly saves resources, avoids waste of resources, reduces maintenance costs and complexity, and is simple to operate and easy to implement. For a cell without a relay node, there is no need to adjust the timeline of the cell, and the timeline of the cell without a relay node will not be affected in any way, so that these cells do not waste resources, and the maintenance complexity of the entire network is reduced. Extending the length of the GP can prevent the situation that the GP is too short caused by extending the downlink subframe and the downlink part of the special subframe on the premise that the uplink part of the special subframe and the uplink subframe remain unchanged. The cell delays the downlink subframe and the downlink part of the special subframe, so that when the control data part of the downlink subframe sent by the relay node reaches the base station, it will not overlap with the uplink receiving part of the base station, thereby avoiding interference. After the relay node advances the downlink part, the control data part in the downlink subframe of the timeline of the relay node does not overlap with the control data part of the downlink subframe of the timeline of the base station to avoid interference.

Finally, it should be noted that those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing related hardware through computer programs, and the programs can be stored in a computer-readable In the storage medium, when the program is executed, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM) and the like.

Each functional unit in the embodiment of the present invention may be integrated into one processing module, or each unit may physically exist separately, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like. Each of the above devices or systems may execute the methods in the corresponding method embodiments.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (8)

1. A method for transmitting data, characterized in that the method comprises: In a time-division duplex network, for a cell where a relay node is deployed, the base station of the cell takes the initial timeline of the network as a reference, and maintains the uplink subframe of the timeline of the cell and the uplink subframe of the special subframe Part remains unchanged, reconfigure the length of the guard time in the special subframe of the timeline of the cell, and use the downlink subframe of the initial timeline of the network and the downlink part of the special subframe as a reference to delay the cell The downlink subframe and the downlink part in the special subframe of the timeline after reconfiguring the guard time to obtain a new timeline of the cell; The base station performs data transmission with the user equipment or the relay node according to the new timeline; Wherein, reconfiguring the length of the guard time in the special subframe of the timeline of the cell includes: The sum of the downlink part in the special subframe and the length of the guard time is kept unchanged, and the length of the guard time is extended. 2. The method according to claim 1, wherein the downlink subframe and the downlink part in the special subframe of the timeline after delaying the reconfiguration protection time of the cell are specifically: The downlink subframe and the downlink part in the special subframe of the timeline after delaying the reconfiguration protection time of the cell are at least: (Tc+τ-2*Tp) seconds; Wherein, Tc is the length of the control data part in the downlink subframe of the relay node, τ is the transition time of the relay node from the sending state to the receiving state, and Tp is the time between the base station of the cell and the relay node. The propagation delay of the node; When there are multiple relay nodes deployed in the cell, a time value is calculated for each relay node according to the (Tc+τ-2*Tp) seconds, and the largest time value is selected from all the obtained time values value, the downlink subframe and the downlink part of the special subframe on the timeline after the reconfiguration guard time of the cell are delayed by at least the maximum value. 3. The method according to claim 1, characterized in that configuring the length of the guard time in the special subframe of the timeline of the cell is specifically: Configure the length of the guard time in the special subframe of the timeline of the cell to be at least: (Tc+τ-2*Tp+L/C) seconds; Wherein, Tc is the length of the control data part in the downlink subframe of the relay node, τ is the transition time of the relay node from the sending state to the receiving state, and Tp is the time between the base station of the cell and the relay node. The propagation delay of the node, L is the distance between the base station of one cell and the base station of another cell, in meters, C is the propagation speed of wireless electromagnetic waves, and C=3.0*10 ⁸ m/s; When there are multiple relay nodes deployed in the cell, a time value is calculated for each relay node according to the (Tc+τ-2*Tp+L/C) seconds, among all the time values obtained A maximum value is selected, and the length of the guard time in the special subframe of the timeline of the cell is delayed by at least the maximum value. 4. The method according to any one of claims 1 to 3, wherein the base station of the cell takes the initial timeline of the network as a reference and keeps the uplink subframe and The uplink part of the special subframe remains unchanged, and the length of the guard time in the special subframe of the timeline of the cell is reconfigured, and the downlink subframe of the initial timeline of the network and the downlink part of the special subframe are used as a reference , delaying the downlink subframe of the timeline and the downlink part in the special subframe after the reconfiguration protection time of the cell, to obtain the new timeline of the cell, specifically: The base station of the cell takes the initial timeline of the network as a reference, keeps the uplink subframe of the timeline of the cell and the uplink part of the special subframe unchanged, and reconfigures the special subframe of the timeline of the cell The length of the guard time, and taking the downlink subframe and the downlink part of the special subframe of the initial timeline of the network as a reference, delay the downlink subframe and the special subframe of the timeline after the reconfiguration guard time of the cell In the downlink part, the new timeline of the cell is obtained, so that when the downlink subframe of the new timeline of the cell and the downlink part of the special subframe reach the adjacent cell through time delay, the timeline of the adjacent cell The uplink subframe and the uplink part of the special subframe do not overlap, and when the downlink subframe of the timeline of the adjacent cell and the downlink part of the special subframe arrive at the cell through a delay, it is different from the new timeline of the cell The uplink subframe of the special subframe does not overlap with the uplink part of the special subframe, and also makes the downlink control data part in the downlink subframe of the timeline of the relay node arrive at the cell through a delay, and the new time of the cell The uplink subframe of the line and the uplink part of the special subframe do not overlap. 5. A base station, characterized in that it is located in a time-division duplex network, and a relay node is deployed in a cell served by the base station, and the base station includes: A processing module, configured to use the initial timeline of the network as a reference, keep the uplink subframe of the timeline of the cell and the uplink part of the special subframe unchanged, and reconfigure the special subframe of the timeline of the cell The length of the guard time, and taking the downlink subframe and the downlink part of the special subframe of the initial timeline of the network as a reference, delay the downlink subframe and the special subframe of the timeline after the reconfiguration guard time of the cell In the downlink part, the new timeline of the cell is obtained; a sending module, configured to perform data transmission with the user equipment or the relay node according to the new timeline; Wherein, the processing module reconfigures the length of the guard time in the special subframe of the timeline of the cell, including: The sum of the downlink part in the special subframe and the length of the guard time is kept unchanged, and the length of the guard time is extended. 6. The base station according to claim 5, wherein the processing module is used for: Delaying the downlink subframe and the downlink part of the special subframe in the timeline after the reconfiguration guard time of the cell is at least (Tc+τ-2*Tp) seconds, when the relay node deployed in the cell is When more than one, calculate a time value for each relay node according to (Tc+τ-2*Tp) seconds, select the maximum value from all the time values obtained, and set the time after the reconfiguration protection time of the cell The downlink subframe of the line and the downlink part of the special subframe are delayed by at least the maximum value; and / or, Configure the length of the guard time in the special subframe of the timeline of the cell to be at least: (Tc+τ-2*Tp+L/C) seconds, when there are multiple relay nodes deployed in the cell, according to Calculate a time value for each relay node in (Tc+τ-2*Tp+L/C) seconds, select the maximum value from all the time values obtained, and protect a length of time delaying at least said maximum value; Wherein, Tc is the length of the control data part in the downlink subframe of the relay node, τ is the transition time of the relay node from the sending state to the receiving state, and Tp is the time between the base station of the cell and the relay node. Node propagation delay, L is the distance between the base station of one cell and the base station of another cell, in meters, C is the propagation speed of wireless electromagnetic waves, and C=3.0*10 ⁸ m/s. 7. The base station according to claim 5, wherein the processing module is specifically configured to keep the uplink subframe of the timeline of the cell and the uplink subframe of the special subframe with reference to the initial timeline of the network Part remains unchanged, reconfigure the length of the guard time in the special subframe of the timeline of the cell, and use the downlink subframe of the initial timeline of the network and the downlink part of the special subframe as a reference to delay the cell The downlink subframe and the downlink part of the special subframe in the timeline after the reconfiguration of the guard time, obtain the new timeline of the cell, so that the downlink subframe and the downlink part of the special subframe of the new timeline of the cell When arriving at an adjacent cell through a delay, it does not overlap with the uplink subframe of the timeline of the adjacent cell and the uplink part of the special subframe, and makes the downlink subframe of the timeline of the adjacent cell and the downlink part of the special subframe When the time delay arrives at the cell, it does not overlap with the uplink subframe of the new timeline of the cell and the uplink part of the special subframe, and also makes the downlink control data in the downlink subframe of the timeline of the relay node When a part arrives at the cell through the time delay, it does not overlap with the uplink subframe of the new timeline of the cell and the uplink part of the special subframe. 8. A system for transmitting data, characterized in that the system is located in a time-division duplex network, comprising: a base station and a relay node, and the relay node is deployed in a cell served by the base station; The base station is configured to use the initial timeline of the network as a reference, keep the uplink subframe of the timeline of the cell and the uplink part of the special subframe unchanged, and reconfigure the special subframe of the timeline of the cell The length of the middle guard time, and taking the downlink subframe and the downlink part of the special subframe of the initial timeline of the network as a reference, delay the downlink subframe and the special subframe of the timeline after the reconfiguration guard time of the cell The downlink part in the frame is used to obtain the new timeline of the cell; it is also used to perform data transmission with the user equipment or the relay node according to the new timeline; The relay node is configured to use the arrival time of the downlink part as a reference and use the time specified in advance as the time of the relay node when the downlink part of the new timeline of the base station propagates to the relay node The position of the downlink part of the line, so that the control data part in the downlink subframe of the timeline of the relay node and the control data part in the downlink subframe of the new timeline of the base station are not the same after arriving at the relay node Overlapping is also used to perform data transmission with the base station or user equipment according to a timeline specified in advance; Wherein, the base station reconfigures the length of the guard time in the special subframe of the timeline of the cell, including: The sum of the downlink part in the special subframe and the length of the guard time is kept unchanged, and the length of the guard time is extended.

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