WO2017088488A1

WO2017088488A1 - Transmission method for ultra-density network, base station, ue, and network element

Info

Publication number: WO2017088488A1
Application number: PCT/CN2016/088902
Authority: WO
Inventors: 张庆宏; 雒艳; 孙中锋
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-11-23
Filing date: 2016-07-06
Publication date: 2017-06-01
Also published as: CN106792950A

Abstract

Disclosed are a transmission method for an ultra-density network, a base station, a UE, and a network element. The method comprises: receiving and monitoring information of an available data cell reported by a user equipment; and if the information of the available data cell satisfies a preset data cell change condition, generating a cell change message, and sending the cell change message to a corresponding network element. By means of the technical solution, the problems of rate decrease for a user and increased time delay due to frequent handovers of data cells in an ultra-density network can be resolved, thereby reducing the quantity of signaling processed by a base station device, and reducing costs of a base station.

Description

Ultra-dense network transmission method, base station, UE and network element

Technical field

The present application relates to, but is not limited to, the field of wireless communications, in particular, an Ultra-Density Network (UDN) transmission method, a base station, a UE (User Equipment), and a network element.

Background technique

With the 4th Generation Mobile Communication System (4G) entering the commercial stage, the 5th Generation Mobile Communication System (5G) for 2020 and future has become a global Research and development hotspots.

The International Mobile Telecommunications 2020 5th Generation Mobile Communication System Promotion Group (International Mobile Telecommunications-2020 5G Promotion Group, referred to as IMT-2020 (5G) Promotion Group) proposes that 5G needs to have higher performance than 4G and supports users of 0.1 to 1 Gbps. Experience rate, one million connection density per square kilometer, millisecond end-to-end delay, tens of Tbps traffic density per square kilometer, mobility above 500Km per hour and peak rate of tens of Gbps. Among them, the user experience rate, the connection density and the delay are the three basic performance indicators of 5G.

UDN can achieve frequency reuse by increasing the density of base station deployment, which can greatly improve the efficiency of frequency reuse. Considering frequency interference, site resources and deployment cost, ultra-dense networking can achieve capacity improvement of 100 times in local hotspots. However, due to the density of the network, there will be an unprecedented impact on mobility management. Compared with the 4G base station in its densely distributed area with a spacing of 300-500 meters, it is necessary to obtain hundreds of times of capacity increase. The 5G base station spacing is likely to be reduced to less than 30 meters. Ideally, the UE user equipment moves 15 meters. A switch will occur on the left and right. In fact, due to the characteristics of refraction, reflection, and scattering of the wireless signal, the wireless signal fluctuates extremely frequently. At this time, it is very common for the UE to switch several times per second in the network, and the long-term evolution of related technologies ( Long-Term Evolution (LTE) handover processing uses hard handover. On the one hand, frequent handover causes traffic interruption, which inevitably reduces the user experience rate. On the other hand, a large number of handover signaling will bring severe challenges to the processing capability of the micro base station equipment. .

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The present application provides an ultra-dense network transmission method, a base station, a UE, and a network element to solve the problem of data transmission interruption caused by cell splitting.

In order to solve the above technical problem, the present application provides a method for transmitting data through an ultra-dense network, including:

Receiving and monitoring information about available data cells reported by the user equipment;

If the information of the available data cell satisfies the preset data cell change condition, a cell change message is generated and sent to the corresponding network element.

Optionally, the preset data cell change condition includes one or more of the following:

The load of the available data cell is less than or equal to the load threshold of the data cell;

The number of users corresponding to the available data cells is less than or equal to the threshold of the number of users of the data cell;

The load of the serving cell is greater than the load of the available data cells;

The number of users corresponding to the serving cell is greater than the number of users corresponding to the available data cells.

Optionally, the step of generating a cell change message and sending the message to the corresponding network element includes:

Generating a path update message to the core network of the ultra-dense network;

Generating a source data cell change message, and transmitting the source data cell change message to the user equipment, the source data cell, and the target data cell, respectively.

Optionally, after the step of sending the source data cell change message to the user equipment, the method further includes:

Transmitting configuration information for transmitting data in the target data cell to the user equipment.

Optionally, the configuration information includes one or more of the following:

Physical cell indication, cell radio network temporary indication, cell reference signal, power information, channel quality indication, scheduling request, semi-static scheduling resource, and sounding reference signal.

Optionally, the step of receiving and monitoring information about an available data cell reported by the user equipment, include:

The information about the available data cells reported by the user equipment is received and monitored by the link between the local cell and the user equipment.

Optionally, the link between the local cell and the user equipment includes: a link between the local cell and the data cell, and a link between the data cell and the user equipment.

In order to solve the above problem, the present application further provides a base station, including:

The monitoring module is configured to receive and monitor information about available data cells reported by the user equipment;

The control module is configured to generate a cell change message and send the information to the corresponding network element if the information of the available data cell satisfies the preset data cell change condition.

Optionally, the control module is configured to generate a path update message, and send the message to the core network of the ultra-dense network; generate a source data cell change message, and send the source data cell change message to the user equipment and the source data respectively. Cell and target data cell.

Optionally, the control module is further configured to: after transmitting the source data cell change message to the user equipment, send configuration information for transmitting data in the target data cell to the user equipment, where The configuration information includes one or more of the following:

In order to solve the above problems, the present application also provides a method for transmitting data through an ultra-dense network, which includes:

The user equipment sends information about the available data cell to the control cell;

When receiving the cell change message sent by the control cell, the user equipment performs a data cell change process.

Optionally, the step of the user equipment performing a change process of the data cell includes:

The user equipment stops transmitting data in the source data cell and starts transmitting data on the target data cell within a specified time sequence.

The application further provides a computer readable storage medium storing computer executable instructions that are implemented when the computer executable instructions are executed.

In order to solve the above problem, the present application further provides a user equipment, including:

a monitoring module, configured to send information about the available data cells to the control cell;

The change module is configured to perform a process of changing the data cell when receiving the cell change message transmitted by the control cell.

Optionally,

The change module is configured to stop transmitting data in the source data cell and start transmitting data in the target data cell within a specified time sequence.

Receiving and monitoring a cell change message sent by the control cell;

The data cell change processing is performed according to the cell change message.

In order to solve the above problem, the present application further provides a network element, including:

The monitoring module is configured to receive and monitor a cell change message sent by the control cell;

The change module is configured to perform data cell change processing based on the cell change message.

Optionally,

The network element includes any one of the following: a network element of a core network of an ultra-dense network, a base station in a source data cell, and a base station in a target data cell.

In summary, the present application provides a method for transmitting data through an ultra-dense network, a base station, a UE, and a network element, which can solve the problem of user rate drop and delay increase caused by frequently switching data cells in an ultra-dense network, and reduce base station equipment processing. The amount of signaling reduces the cost of the base station.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

The drawings described herein are intended to provide a further understanding of the present application, and are intended to be a part of this application. In the drawing:

FIG. 1 is a schematic diagram of a method for transmitting data through an ultra-dense network on a base station side according to an embodiment of the present invention; flow chart;

2 is a flowchart of a method for transmitting data through an ultra-dense network on a UE side according to an embodiment of the present invention;

3 is a flowchart of a method for transmitting an ultra-dense network according to Embodiment 1 of the present invention;

4 is a schematic diagram of a transmission system of an ultra-dense network according to Embodiment 1 of the present invention;

5 is a schematic diagram of a transmission system of an ultra-dense network according to Embodiment 2 of the present invention;

FIG. 6 is a block diagram of a base station according to an embodiment of the present invention; FIG.

FIG. 7 is a block diagram of a UE according to an embodiment of the present invention; FIG.

FIG. 8 is a block diagram of a network element according to an embodiment of the present invention.

Preferred embodiment of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

The IMT2020 (5G) propulsion group has clear requirements for the number of links per unit area and the density of the traffic: one million connections per square kilometer, the end-to-end delay in milliseconds, and the traffic density of tens of Tbps per square kilometer; The splitting community is a UHF micro-cell, which will be the most direct and effective measure to achieve this goal. However, the interruption of data caused by the continuous splitting of the cell will make the traffic and link density indicators difficult to implement (the cell split will have a negative gain to a certain extent), and the end-to-end delay of milliseconds will become almost impossible ( The LTE handover data interruption delay of the related art is a minimum of 50 ms); in addition, a large amount of signaling generated by the infinite splitting of the cell will also increase the cost of the micro base station equipment by a geometric number.

In this embodiment, in the ultra-dense network, all control signaling is sent by a base station in a specific cell, which is referred to herein as a Control Cell (Ccell); the data transmission service is super-dense composed of a plurality of micro cells. The network provides, referred to herein as a data cell (Data Cell, referred to as Dcell). The Ccell coverage area includes N DCell coverage areas, where N>=1.

The user equipment needs to maintain a wireless connection with the Ccell and the Dcell at the same time.

The UE monitors the Dcell for which the service can be served, and reports the monitoring result to the Ccell.

After the Ccell determines whether to change the cell, if the Dcell of the UE needs to be changed, the Ccell notifies the UE, the source Dcell, and the target Dcell of the change result, and simultaneously informs the UE of all configuration information required for transmitting data in the target Dcell, and the configuration information includes Some or all of the content:

Cell identification class: PCI (Physical Cell Index), CRNTI (Cell Radio Network Temporal Index), cell reference signal, and power information;

Semi-static configuration resources: CQI (Channel Quality Indicator), SR (Schedule Request), SPS (Semi-persistent Schedule), SRS (Sounding Reference Signal), and so on.

The source Dcell, the target Dcell, and the UE notify the Ccell message that, after receiving the information, the serving cell update is completed within a specified time.

FIG. 1 is a flowchart of a method for transmitting data through an ultra-dense network on a base station side according to an embodiment of the present invention. As shown in FIG. 1 , the method in this embodiment includes:

Step 11: Receive and listen to information about available data cells reported by the user equipment.

Step 12: If the information of the available data cell satisfies the preset data cell change condition, a cell change message is generated and sent to the corresponding network element.

2 is a flowchart of a method for transmitting data through an ultra-dense network on the UE side according to an embodiment of the present invention. As shown in FIG. 2, the method in this embodiment includes:

Step 21: The UE sends information about the available data cell to the control cell.

Step 22: When receiving the cell change message of the control cell, the UE changes the connected data cell.

The method provided in the embodiment of the present invention can solve the problem of interrupted data transmission interruption caused by cell splitting, and helps the cell to be infinitely split; so that the end-to-end delay in the fifth-generation mobile communication system is as low as milliseconds; The split causes a micro-zone signaling storm.

The method of the present application will be described in detail below by means of two embodiments.

Embodiment 1

As shown in FIG. 3, the method in this embodiment includes the following steps:

Step 101: Pre-condition: The UE accesses the Ccell, and the Ccell has allocated one or several Dcells for the UE to provide data transmission services for the UE. The link between the UE and the Dcell is recorded as a Duu interface, and between the UE and the Ccell. The link is recorded as a Cuu port, and the link between the Dcell and the Ccell is recorded as a DC port. The Ccell coverage area includes one or more Dcells. The Ccell coverage is usually wide and does not belong to the UDN category. Discussed in the application.

Step 102: The Ccell monitors and receives the available Dcell information reported by the UE through the Cuu interface, as shown in FIG. 4, where Cuu has some or all of the following features:

The design capacity of the Cuu port is lower than that of the Duu port. Since the Cuu port only processes signaling, its capacity and bandwidth requirements are small;

The Cuu port has a wide coverage in the low frequency band. Since the coverage of the Ccell needs to include one or more Dcells, the low-frequency radio wave has low spatial propagation loss and good wireless characteristics. Compared with the Duu port, the low frequency is more suitable for the Cuu port;

The Cuu port multiplexes the current LTE network. Due to the forward compatibility requirements of the future 5G technology and LTE, the Cuu port can borrow the current LTE network to provide signaling coverage for the UDN.

The Cuu port can be transited through the Dcell. The wireless coverage of the Ccell and the Dcell cannot be completely overlapped. When the Dcell coverage exceeds the coverage of the Ccell, the Cuu port signal can also be transited through the Dcell, thereby ensuring that the Cuu port is larger than the Duu port.

Step 103: The Ccell receives and listens to the signaling reported by all the UEs in the coverage area through the Cuu interface. The step includes:

Cuu port message decoding, all UE and signaling classification;

All available Dcell information reported by all UEs in the Ccell.

The information reported by the UE in this step is used as the original input processed in step 104, that is, the basis for determining whether a cell change is required. In this step, the UE signaling is reported, and in step 102, the available data cell information is reported.

Step 104: Determine whether to change the data cell;

That is, the Ccell selects all UEs that meet the target Dcell change criteria and their targets according to all available Dcell information reported by all UEs and the target Dcell change criteria set in this embodiment. Dcell, these target Dcells constitute a target candidate Dcell set of the UE; finally, the Ccell selects some or all Dcells of the candidate Dcell set as the final target Dcell according to the UE service demand quantity, for the candidate target Dcell set,

Wherein, if UE_i, the service Dcell is Dcell_S, the corresponding number of users is Nue_Dcell_S, and the load is Load_Dcell_S;

The reported N available target Dcells are respectively Dcell_Ti; the corresponding number of users is Nue_Dcell_Ti, the load is Load_Dcell_Ti; i=1, 2,..., n, n<=N; then the target Dcell change criterion includes the following conditions or some or all of the logical combinations :

Load_Dcell_Ti<=Thresh_Load_i, where Thresh_Load_i is the load threshold of the target cell i;

Nue_Dcell_Ti<=Thresh_Nue_i, where Thresh_Nue_i is the threshold of the number of UEs of the target cell i;

Load_Dcell_S<Load_Dcell_Ti;

Nue_Dcell_S<Nue_Dcell_Ti,

If all the target cells do not meet the above conditions, then no cell change is required, proceed to step 102; if all target cells meet the specified one or more conditions, proceed to step 105;

Step 105: The Cell generates all the messages required for the cell change, and sends the message to the corresponding network element. After receiving the message, each related network element takes effect at the same time in the agreed time sequence.

Step 105 includes:

Generating a path update message to the core network of the UDN, and after receiving the message, the core network of the UDN updates the path within the agreed time sequence;

Generating a source Dcell change message to the UE, the source Dcell, and the final destination Dcell;

After receiving the message, within a predetermined time sequence, the UE stops data transmission at the source Dcell and starts data transmission at the target Dcell.

Embodiments of the present invention further provide a computer readable storage medium storing computer executable instructions that are implemented when the computer executable instructions are executed.

Embodiment 2

This embodiment includes the following steps:

Step 201 is the same as the step 101 in the first embodiment.

Step 202: The Ccell monitors and receives the available Dcell information reported by the UE through the Cuu interface, where Cuu is a logical connection, and the logical connection is divided into two segments: UE to Dcell and Dcell to Ccell, as shown in FIG. 5; according to step 201, the UE The Dcell is connected through the Duu port; the Dcell to the Ccell is connected through the DC port, that is, the signaling between the UE and the Ccell is encapsulated into a signaling-dedicated logical pipe, which is transmitted through the Duu port and the DC port.

The DC port can be a wireless connection or a wired connection. The embodiment of the present invention relates to the field of wireless communication. The wired connection is not discussed too much. The connection for the wireless DC interface is as follows:

The DC port has some or all of the following features:

The DC port design capacity is lower than the Duu port. Because the DC port only processes signaling, its capacity and bandwidth requirements are relatively small;

The DC port has a wide coverage in the low frequency band. Since the coverage of the Ccell needs to include one or more Dcells, the low-frequency radio wave has low spatial propagation loss and good wireless characteristics. Compared with the Duu port, the low frequency is more suitable for the DC port;

The DC port multiplexes the current LTE network. Due to the forward compatibility requirements of the future 5G technology and LTE, the DC port can borrow the current LTE network to provide signaling coverage for the UDN.

Step 203, the Ccell is monitored and received by the Cuu port, and the signaling reporting of all the UEs in the coverage area is the same as that in the first embodiment;

Step 204, determining whether a cell change is required, as in the first embodiment;

Step 205: The Cell generates all the messages required for the cell change, and sends the message to the corresponding network element. After receiving the message, each related network element takes effect at the same time in the agreed time sequence.

FIG. 6 is a block diagram of a base station according to an embodiment of the present invention. As shown in FIG. 6, the base station in this embodiment includes:

In an optional embodiment, the control module is configured to generate a path update message, and send the message to the core network of the ultra-dense network; generate a source data cell change message, and send the source data cell change message to the user equipment, Source data cell and target data cell.

In an optional embodiment, the control module is further configured to: after transmitting the source data cell change message to the user equipment, send configuration information for transmitting data in the target data cell to the user equipment. The configuration information includes one or more of the following:

PCI, CRNTI, cell reference signal, power information, CQI, SR, SPS, SRS.

FIG. 7 is a block diagram of a UE according to an embodiment of the present invention. As shown in FIG. 7, the UE in this embodiment includes:

In an optional embodiment, the change module is configured to stop transmitting data in the source data cell and start transmitting data in the target data cell within a specified time sequence.

FIG. 8 is a block diagram of a network element according to an embodiment of the present invention. As shown in FIG. 8, the network element in this embodiment includes:

Optionally, the network element includes: a network element of a core network of an ultra-dense network, a base station in a source data cell, and a base station in a target data cell.

One of ordinary skill in the art will appreciate that all or a portion of the steps described above can be accomplished by a program that instructs the associated hardware, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware or in the form of a software function module. This application is not limited to any specific combination of hardware and software.

One of ordinary skill in the art will appreciate that all or part of the steps in the above methods may be passed through the program. The instructions are related to hardware (eg, a processor) that can be stored in a computer readable storage medium, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function. Embodiments of the invention are not limited to any specific form of combination of hardware and software.

The above is only an alternative embodiment of the present application. Of course, the present application may also have various other embodiments. Those skilled in the art can make various according to the present application without departing from the spirit and spirit of the present application. Corresponding changes and modifications are intended to be included within the scope of the appended claims.

Industrial applicability

The present invention provides a method for transmitting data through an ultra-dense network, a base station, a UE, and a network element, which can solve the problem of user rate drop and delay increase caused by frequently switching data cells in an ultra-dense network, and reduce signaling processing of the base station equipment. Quantity, reducing base station costs.

Claims

A method of transmitting data over an ultra-dense network, including:

Receiving and monitoring information about available data cells reported by the user equipment;

If the information of the available data cell satisfies the preset data cell change condition, a cell change message is generated and sent to the corresponding network element.
The method of claim 1 wherein said preset data cell change condition comprises one or more of the following:

The load of the available data cell is less than or equal to the load threshold of the data cell;

The number of users corresponding to the available data cells is less than or equal to the threshold of the number of users of the data cell;

The load of the serving cell is greater than the load of the available data cells;

The number of users corresponding to the serving cell is greater than the number of users corresponding to the available data cells.
The method of claim 1, wherein the step of generating a cell change message and transmitting the message to the corresponding network element comprises:

Generating a path update message to the core network of the ultra-dense network;

Generating a source data cell change message, and transmitting the source data cell change message to the user equipment, the source data cell, and the target data cell, respectively.
The method of claim 3, after the step of transmitting the source data cell change message to the user equipment, the method further includes:

Transmitting configuration information for transmitting data in the target data cell to the user equipment.
The method of claim 4 wherein said configuration information comprises one or more of the following:

Physical cell indication, cell radio network temporary indication, cell reference signal, power information, channel quality indication, scheduling request, semi-static scheduling resource, and sounding reference signal.
The method of any one of claims 1-5, wherein the step of receiving and monitoring information of an available data cell reported by the user equipment comprises:

The information about the available data cells reported by the user equipment is received and monitored by the link between the local cell and the user equipment.
The method of claim 6 wherein

The link between the local cell and the user equipment includes: a link between the current cell and the data cell and a link between the data cell and the user equipment.
A base station comprising:

The monitoring module is configured to receive and monitor information about available data cells reported by the user equipment;

The control module is configured to generate a cell change message and send the information to the corresponding network element if the information of the available data cell satisfies the preset data cell change condition.
The base station according to claim 8, wherein

The control module is configured to generate a path update message, and send the message to the core network of the ultra-dense network; generate a source data cell change message, and send the source data cell change message to the user equipment, the source data cell, and the target data, respectively. Community.
The base station according to claim 9,

The control module is further configured to: after transmitting the source data cell change message to the user equipment, send configuration information for transmitting data in the target data cell to the user equipment, where the configuration information includes One or more of the following:

Physical cell indication, cell radio network temporary indication, cell reference signal, power information, channel quality indication, scheduling request, semi-static scheduling resource, and sounding reference signal.
A method of transmitting data over an ultra-dense network, including:

The user equipment sends information about the available data cell to the control cell;

When receiving the cell change message sent by the control cell, the user equipment performs a data cell change process.
The method of claim 11, wherein the step of the user equipment performing a change process of the data cell comprises:

The user equipment stops transmitting data in the source data cell and starts transmitting data on the target data cell within a specified time sequence.
A user equipment comprising:

a monitoring module, configured to send information about the available data cells to the control cell;

The change module is configured to perform a process of changing the data cell when receiving the cell change message transmitted by the control cell.
The user equipment according to claim 13, wherein

The change module is configured to stop transmitting data in the source data cell and start transmitting data in the target data cell within a specified time sequence.
A method of transmitting data over an ultra-dense network, including:

Receiving and monitoring a cell change message sent by the control cell;

The data cell change processing is performed according to the cell change message.
A network element, including:

The monitoring module is configured to receive and monitor a cell change message sent by the control cell;

The change module is configured to perform data cell change processing based on the cell change message.
The network element of claim 16 wherein

The network element includes any one of the following: a network element of a core network of an ultra-dense network, a base station in a source data cell, and a base station in a target data cell.