WO2014201932A1

WO2014201932A1 - Method for transmitting cre offset value and base station

Info

Publication number: WO2014201932A1
Application number: PCT/CN2014/077996
Authority: WO
Inventors: 汤斌淞; 王燕; 周国华
Original assignee: 华为技术有限公司
Priority date: 2013-06-18
Filing date: 2014-05-21
Publication date: 2014-12-24
Also published as: CN104244340A; CN104244340B

Abstract

A method and device for transmitting a cell range expansion (CRE) offset value. The method comprises the following steps: a first base station determining a CRE offset value of a first cell to a second cell (201), wherein the first cell is a cell under the first base station, the second cell is a cell under the second base station, and the first cell and the second cell are adjacent cells; and the first base station sending the second base station the CRE offset value of the first cell to the second cell (202), wherein the CRE offset value of the first cell to the second cell is used for the second base station to determine a CRE offset value of the second cell to a neighbouring cell. The embodiments of the present invention can reduce the occurrence of the ping-pong phenomenon when a user equipment (UE) undergoes cell expansion.

Description

Method for transmitting CRE bias signal and base station

This application claims priority to Chinese Patent Application No. 201310242977.X, entitled "Transmission Method and Base Station for CRE Offset Value", filed on June 18, 2013, the entire contents of which are hereby incorporated by reference. The citations are incorporated herein by reference. Technical field

[01] The present invention relates to the field of communications, and in particular, to a method and a base station for transmitting a CRE offset value. Background technique

[02] In a heterogeneous network (HetNet, Heterogeneous Network), a scene in which a macro cell and a pico cell share a spectrum is taken as an example, because the transmission power of the pico cell and the P macro cell is large. Generally, the user equipment (UE, User Equipment) in the pico cell receives data from the physical downlink control channel (PDCCH, Physical Downlink Control Channel) when it receives data of 30 decibels (dBm) and 46 dBm. The severe interference of the macro cell causes the physical downlink control channel performance in the pico cell to be low.

[03] When the pico cell introduces a Cell Range Expansion (CRE) technique, the performance of the PDCCH in the pico cell will be worse. For example, in the cell range extension technology, when the UE moves from the Macro cell to the Pico cell, in order to effectively mitigate the impact of the data traffic on the macro cell, the macro base station to which the Macro cell belongs can be set by controlling the offset value in the handover. The UE accesses the micro base station to which the Pico cell belongs earlier. This CRE technology is equivalent to expanding the coverage of the Pico cell. This enlarged area is called the cell extension area of the Pico cell. This offset value can be called the CRE offset value of the micro base station to the macro base station.

[04] In the prior art, the UE is prone to pingpong handover when passing through the cell extension area, thereby affecting the communication quality of the UE and wasting network communication resources. Summary of the invention

[05] In the embodiment of the present invention, a method for transmitting a CRE offset value and a base station are provided, which can reduce the pingpong phenomenon when the UE passes through the cell extension area, improve the communication quality of the UE, and reduce the network communication. Waste of resources.

A first aspect of the embodiments of the present invention provides a method for transmitting a CRE offset value, including: determining, by a first base station, a CRE offset value of a first cell to a second cell; a cell under the base station, where the second cell is a cell under the second base station, the first cell and the second cell are adjacent to each other; the first base station is the first cell to the second The CRE offset value of the cell is sent to the second base station, and the CRE offset value of the first cell to the second cell is used by the second base station to determine a CRE offset of the second cell to the neighboring cell. value.

According to the first aspect, in a first possible implementation manner of the first aspect, the method further includes: the first base station sends the identifier information to the second base station, where the identifier information is used to determine The first cell.

A second aspect of the present invention provides a method for transmitting a CRE offset value, including: receiving, by a second base station, a CRE offset value of a first cell to a second cell sent by a first base station; The cell is a cell under the first base station, the second cell is a cell under the second base station, and the first cell and the second cell are neighboring cells; The CRE offset value of the first cell to the second cell determines a CRE offset value of the second cell to the neighboring cell.

According to the second aspect, in a first possible implementation manner of the second aspect, the method further includes: the second base station receiving the identifier information, where the identifier information is used to determine the neighboring cell.

[10] The third aspect of the embodiments of the present invention provides a first base station, including: a determining unit, configured to determine a CRE offset value of the first cell to the second cell; the first cell is the first a cell under the base station, where the second cell is a cell under the second base station, the first cell and the second cell are adjacent cells, and a sending unit is configured to send the first cell to the second cell The CRE offset value of the cell is sent to the second base station, and the CRE offset value of the first cell to the second cell is used by the second base station to determine a CRE offset of the second cell to the neighboring cell. value.

[11] The third aspect, in a first possible implementation manner of the third aspect, the sending unit is further configured to send the identifier information to the second base station, where the identifier information is used to determine the first Community.

[12] The fourth aspect of the embodiments of the present invention provides a second base station, including: a receiving unit, configured to receive a CRE offset value of a first cell to a second cell that is sent by the first base station; a cell under the first base station, the second cell is a cell under the second base station, the first cell and the second cell are adjacent cells, and a determining unit is configured to be used according to the The CRE offset value of the second cell to the second cell determines a CRE offset value of the second cell to the neighboring cell.

[13] Based on the fourth aspect, in a first possible implementation manner of the fourth aspect, the receiving unit is further used Receiving identification information, where the identification information is used to determine the neighboring cell.

According to the technical solution provided by the embodiment of the present invention, the base station may set the CRE offset value of the cell to the neighboring cell of the cell under the base station by referring to the CRE offset value set by the neighboring cell to the cell under the base station, and the UE passes the cell under the base station. The cell extension area can reduce the pingpong phenomenon caused by the CRE offset value set by the cell under other base stations. DRAWINGS

[15] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only Some of the embodiments of the invention may be obtained by those of ordinary skill in the art in view of the drawings without departing from the scope of the invention.

[16] FIG. 1A is a schematic diagram of CRE of a macro cell and a micro cell;

[17] FIG. 1B is a schematic diagram of CRE between a micro base station and a neighboring macro base station;

[18] FIG. 2 is a schematic flow chart of a method for transmitting a CRE offset value;

[19] FIG. 3 is a schematic diagram of the adjustment of the CRE offset value of the micro cell by the macro cell;

[20] FIG. 4 is a schematic diagram of the CRE offset value of the micro cell to the macro cell;

[21] FIG. 5 is a schematic structural diagram of a first base station;

[22] FIG. 6 is a schematic structural diagram of a first base station;

[23] FIG. 7 is a schematic flow chart of a method for transmitting a CRE offset value;

[24] FIG. 8 is a schematic structural diagram of a second base station;

[25] FIG. 9 is a schematic structural diagram of a second base station. detailed description

[26] In order to enable the UE to handover to the target cell as early as possible during the mobile process, a cell range extension technique is introduced. For example, as shown in FIG. 1A, the CRE of the macro cell and the micro cell, the UE performs service transmission in the macro cell, and the UE gradually approaches the micro cell as the UE moves, in order to reduce the load and service traffic in the macro cell, the macro base station Receiving a CRE offset value of the micro cell to the macro cell sent by the micro base station, and determining, according to the CRE offset value, whether the UE can be switched to the micro cell as early as possible. The macro base station may switch the UE to the micro cell according to the CRE offset value of the micro cell to the macro cell. Because the macro cell has an unreasonable setting of the CRE offset value of the micro cell, when the UE switches to the micro cell, the micro base station determines the The UE has fallen into the cell extension area of the macro cell, causing the micro base station to switch the UE back to the macro base station, and then the macro base station may The UE is switched to the micro cell according to the CRE offset value of the micro cell to the macro cell, and the pingpong phenomenon is generated by repeatedly switching back and forth, resulting in the UE failing to perform the communication service normally.

[27] For another example, see the CRE diagram between the micro base station and the adjacent macro base station shown in FIG. 1B. It is assumed that the CRE determined by the CRE offset value of the micro cell to the macro cell A is as shown in the figure, and there is no CRE between the micro cell and the macro cell B. When the UE moves according to the UE path in FIG. 1B, the handover process of the UE It is: switching from the macro cell A to the micro cell, switching from the micro base station to the macro cell B, switching from the macro cell B to the micro cell, and switching from the micro cell to the macro cell B, thereby generating a pingpong phenomenon.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The first base station and the second base station in the embodiments of the present invention may be: an evolved base station (eNB), a base station (Node B), a base station (BS), a base station transmitting station (BTS), and an access point (AP). The UE may be an access terminal, an access point, a personal digital assistant (PDA), a laptop, or the like. The first base station can be either a macro base station or a micro base station, and the second base station can be either a macro base station or a micro base station.

[30] In the following embodiments of the present invention, the so-called CRE offset value may be an absolute value of the CRE offset value, which is not limited herein.

An embodiment of the present invention provides a method for transmitting a CRE offset value, and FIG. 2 is a schematic flowchart of a method for transmitting the CRE offset value, where the method includes the following content.

[32] Step 201: The first base station determines a CRE offset value of the first cell to the second cell, where the first cell is a cell under the first base station, and the second cell is a cell under the second base station. The first cell and the second cell are adjacent cells.

[32] Step 202: The first base station sends a CRE offset value of the first cell to the second cell to the second base station, where the first cell has a CRE bias to the second cell. The value is used by the second base station to determine a CRE offset value of the second cell to a neighboring cell of the second cell.

[34] Optionally, the first base station may carry the CRE offset value of the first cell to the second cell in the mobility change request message and send the message to the second base station. A new field implementation can be added based on the existing mobility change request message, as shown in Table 1, with the addition of eNB (Pico) Mobility Parameters. This field. The CRE offset value of the first cell to the second cell may be carried by this field.

Table 1

IE/group name Pres shed IE type and parameters semantic description critical allocation importance

(IE/Group ence ( Range ) ( IE type and ( Semantics ( Criticalit (Assigned

Name) reference ) description '■ y) Criticality) Message type M 9.2.13 Yes (YES ) Reject

(Message

Type) eNB1 Cell ID M Enhanced Global Small YES reject Area ID (ECGI) 9.2.14 eNB2 Cell ID M ECGI YES reject 9.2.14 eNB1 Mobile Parameter 0 Mobile Parameter Information eNB1 Cell YES Ignore (Mobility (Mobility) Structural change

Parameters Parameters ( Configuratio Information) n change in 9.2.48 eNB1 cell) eNB1 (Pico) 0 CRE Mobility Configuration

Mobility Parameters change in

Parameters Information eNB2 cell.

(CRE) 9.2.481 eNB2 presets the default structure of the YES reject parameter in the M Mobility eNB2 cell.

(Proposed Informationization (Proposed

Mobility 9.2.48 configuration

Parameters ) change in eNB2 cell) Cause (Cause) M 9.2.6 YES reject

[35] In step 201, the CRE offset value of the first cell to the second cell determined by the first base station may be sent by the network management system, or may be determined by the first base station according to the received first cell. The neighboring cell sets the CRE offset value of the first cell. The neighboring cell of the first cell may be the second cell or other neighboring cells of the first cell except the second cell.

[26] In step 202, the neighboring cell of the second cell may be the first cell, or may be other neighboring cells of the second cell except the first cell.

In the embodiment of the present invention, the second base station sends the CRE offset value of the second cell determined by the second cell to the CRE offset value of the second cell to the first base station, so that the first base station The base station adjusts the CRE offset value of the first cell to the second cell according to the CRE offset value of the second cell to the first cell, and the first base station sends the CRE offset value adjustment result of the first cell to the second cell to The second base station is configured to further optimize the CRE offset value of the second cell to the first cell by using the second base station, so as to minimize the pingpong phenomenon caused by the unreasonable setting of the CRE offset value.

[38] As an optional implementation manner, when determining, by the second cell, the CRE offset value of the second cell to the neighboring cell of the second cell, the second base station may include:

[39] The second base station determines, according to the CRE offset value of the second cell of the first cell, the CRE offset value of the second cell to the first cell, and the second base station further uses the second cell to the other neighboring cells of the second cell. The CRE offset value is set to be the same as the CRE offset value of the second cell to the first cell. As an example, in the process of determining, by the second base station, the CRE offset value of the second cell to the first cell according to the CRE offset value of the first cell to the second cell, the first cell is made to the second cell as much as possible. The cell extension area and the second cell have the smallest overlap with the cell extension area of the first cell. FIG. 3 is a schematic diagram of the macro cell to the CRE offset value of the micro cell. The overlap of the cell extension area of the macro cell and the micro cell is smaller than that of FIG. 1A, and the UE After the handover to the micro cell, the CRE of the macro cell to the micro cell is reduced, and the UE is not easily switched to the macro cell, thereby reducing the pingpong phenomenon of the UE in the macro cell and the micro cell. Therefore, since the coverage of the macro cell and the micro cell is determined under ideal conditions after the network is deployed, if the CRE offset value of the macro cell to the micro cell becomes larger, the CRE bias of the macro cell needs to be changed. Small, it is possible to ensure that the range of the cell expansion area becomes smaller or unchanged, so that the pingpong phenomenon does not increase. Furthermore, the schematic diagram of the micro-cell as shown in FIG. 4 is adjusted to the CRE offset value of the macro cell. The CRE offset value of the micro cell to the macro cell B is set to be the same as the CRE offset value of the micro cell to the macro cell A, so that when the UE passes through the cell extension area of the micro cell, the handover process is switched from the macro cell A to the micro cell. The area, switching from the micro cell to the macro cell B, will greatly reduce the occurrence of the pingpong phenomenon compared with the figure IB.

[40] Optionally, the method further includes: Step 203: The first base station sends the identifier information to the second base station, where the identifier information is used to determine the first cell.

[41] Optionally, the identifier information may include a Public Land Mobile Network (PLMN) to which the first cell belongs. In the case of shared spectrum, that is, the first cell or the second cell may belong to a plurality of PLMNs. Usually an operator corresponds to at least one PLMN. For example, the first cell belongs to both the A operator and the B carrier. The second base station may specifically determine, according to the identification information, which PLMN second cell and which PLMN first cell the second cell is when setting the first cell CRE offset value. For example, it may be a CRE offset value of the second cell of the A operator to the first cell of the A operator, or a CRE bias of the second cell of the A operator to the first cell of the B operator. The value may also be a CRE offset value of the first cell under the B operator to the first cell under the A operator. The field corresponding to the first network identifier may be further added on the basis of Table 1: serving PLMN, thereby obtaining the mobility change request structure shown in Table 2.

Table 2

IE/Group Name Presence Range IE type and reference

Serving PLMN M PLMN Identity 9.2.4

Message Type M 9.2.13 eNBl Cell ID M ECGI 9.2.14 eNB2 Cell ID M ECGI 9.2.14 eNB1 Mobility Parameters 0 Mobility Parameters Information 9.2.48 eNB1 (Pico) Mobility Parameters 0 CRE Mobility Parameters Information (CRE) 9.2.481 eNB2 Proposed Mobility Parameters M Mobility Parameters Information 9.2.48

Cause M 9.2.6

[42] An embodiment of the present invention provides a first base station 500, where the first base station can perform the action performed by the first base station in the method embodiment corresponding to FIG. 2, and the first base station is as shown in FIG. Schematic diagram of the structure, the first base station includes:

[43] determining unit 510, configured to determine a CRE offset value of the first cell to the second cell; the first cell is a cell under the first base station, and the second cell is a cell under the second base station The first cell and the second cell are adjacent cells;

[44] The sending unit 520 is configured to send, by the first cell, a CRE offset value of the second cell to the second base station, where the first cell has a CRE offset value to the second cell. And determining, by the second base station, a CRE offset value of the second cell to a neighboring cell.

[45] Optionally, the sending unit is further configured to send the identifier information to the second base station, where the identifier information is used to determine the first cell.

[46] The CRE offset value of the first cell to the second cell determined by the determining unit 510 may be sent by the network management system, or may be the first base station according to the neighboring cell pair of the received first cell. The CRE offset value of the cell is set.

An embodiment of the present invention provides a first base station 600, where the first base station can perform the action performed by the first base station in the method embodiment corresponding to FIG. 2, and FIG. 6 shows the structure of the first base station. The first base station includes: a processor 610, a memory 620, a transceiver 630, and a bus 640. The processor 610, the memory 620, and the transceiver 630 are connected to each other through a bus 640. The memory 620 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory. The bus 640 can be divided into an address bus, a data bus or a control bus, and the like. For the convenience of the table As shown in Fig. 6, only one thick line is shown, but it does not mean that there is only one bus or one type of bus.

[48] Memory 620, used to store program code. Processor 610 is operative to execute the program code. The program code is used to implement the following actions:

[49] determining a CRE offset value of the first cell to the second cell; the first cell is a cell under the first base station, the second cell is a cell under the second base station, and the first cell is a cell that is adjacent to the second cell, and sends a CRE offset value of the first cell to the second cell to the second base station, where the first cell is a CRE of the second cell The offset value is used by the second base station to determine a CRE offset value of the second cell to the neighboring cell.

[50] Optionally, the program code is further configured to: send the identifier information to the second base station, where the identifier information is used to determine the first cell.

According to the technical solution provided by the embodiment of the present invention, the base station may set the CRE offset value of the cell to the neighboring cell of the cell under the base station by referring to the CRE offset value set by the neighboring cell to the cell under the base station, and the UE passes the cell under the base station. The cell extension area can reduce the pingpong phenomenon caused by the CRE offset value set by the cell under other base stations.

Another embodiment of the present invention provides a method for transmitting a cell range extended CRE offset value, and a flow chart of a method for transmitting a CRE offset value, as shown in FIG. 7, the method includes the following content.

[53] Step 701: The second base station receives, by the first base station, a CRE offset value of the first cell to the second cell, where the first cell is a cell under the first base station, and the second cell is a cell under the second base station. The first cell and the second cell are adjacent cells.

[54] Step 702: The second base station determines, according to the CRE offset value of the second cell by the first cell, a CRE offset value of the second cell to the neighboring cell.

[55] In step 702, the neighboring cell may be the first cell, or may be other neighboring cells of the second cell except the first cell. The process of determining, by the second cell, the CRE offset value of the second cell to the neighboring cell according to the CRE offset value of the second cell by the first cell has been detailed in the foregoing method embodiment, and details are not described herein. The method embodiment corresponding to FIG. 2 is shown.

Optionally, the foregoing method may further include the step 703, where the second base station receives the identifier information, where the identifier information is used to determine the neighboring cell. The identification information may be a PLMN to which the neighboring cell of the second cell belongs. In the case of network spectrum sharing, the second cell or one neighboring cell of the second cell may belong to multiple PLMNs. Usually, one operator corresponds to at least one PLMN. The second base station may determine, according to the identification information, which PLMN or which operator's CRE offset value of the neighboring cell is set by the second cell. It may be assumed that the neighboring cell of the second cell is the first cell, and the second base station may determine, according to the identifier information, the CRE offset value of the second cell to the first cell in the PLMN1, or the second cell to the PLMN2. The settings made by the first cell.

The embodiment of the present invention provides a second base station 800, which is a schematic structural diagram of the second base station 800 shown in FIG. 8. The second base station 800 can perform the second base station in the method embodiment corresponding to FIG. 7. The second base station 800 includes: a receiving unit 810, configured to receive a CRE offset value of the first cell to the second cell that is sent by the first base station; where the first cell is the first base station a cell, the second cell is a cell under the second base station, the first cell and the second cell are adjacent cells, and the determining unit 820 is configured to: according to the first cell pair The CRE offset value of the second cell determines the CRE offset value of the second cell to the neighboring cell.

[0] Optionally, the receiving unit is further configured to receive the identifier information sent by the first base station, where the identifier information is used to determine the neighboring cell.

The embodiment of the present invention further provides a second base station 900, which is a schematic structural diagram of the second base station 900, as shown in FIG. 9, the second base station 900 can perform the second base station in the method embodiment corresponding to FIG. The second base station 900 includes: a processor 910, a memory 920, a transceiver 930, and a bus 940. The processor 910, the memory 920, and the transceiver 930 are connected to each other through a bus 940. Memory 920 may include high speed RAM memory and may also include non-volatile memory, such as at least one disk memory. The bus 940 can be divided into an address bus, a data bus, or a control bus. For ease of representation, only one thick line is shown in Figure 9, but it does not mean that there is only one bus or one type of bus.

[60] The memory 920 is for storing computer program code, and the processor 910 is for executing the computer program code.

[61] The computer program code is configured to: receive a CRE offset value of the first cell to the second cell sent by the first base station; the first cell is a cell under the first base station, The second cell is a cell under the second base station, where the first cell and the second cell are adjacent cells; determining, according to a CRE offset value of the first cell to the second cell, The CRE offset value of the second cell to the neighboring cell.

[62] Optionally, the computer program code is further configured to: receive identifier information, where the identifier information is used to determine the neighboring cell.

According to the technical solution provided by the embodiment of the present invention, the base station may set the CRE offset value of the cell to the neighboring cell of the cell under the base station by referring to the CRE offset value set by the neighboring cell to the cell under the base station, and the UE passes the base station. When the cell extension area of the lower cell is used, the pingpong phenomenon caused by the CRE offset value set by the cell under other base stations can be reduced.

It will be apparent to those skilled in the art that the techniques in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such understanding, the technical solution in the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product, and the computer software product may be stored in a storage medium such as a ROM/RAM. , a diskette, an optical disk, etc., comprising instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or in certain portions of the embodiments.

[65] The various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments may be referred to each other, and each embodiment focuses on differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

The above described embodiments of the invention are not intended to limit the scope of the invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Rights request

A method for transmitting a CFR offset value of a cell range, the method includes: determining, by a first base station, a CRE offset value of a first cell to a second cell; The second cell is a cell under the second base station, and the first cell and the second cell are adjacent cells;

Sending, by the first base station, a CRE offset value of the first cell to the second cell to the second base station, where a CRE offset value of the first cell to the second cell is used for the The second base station determines a CRE offset value of the second cell to the neighboring cell.

2. The method according to claim 1, further comprising:

The first base station sends the identifier information to the second base station, and the identifier information is used to determine the first cell.

A method for transmitting a cell-wide extended CRE offset value, comprising: receiving, by a second base station, a CRE offset value of a first cell to a second cell sent by a first base station; a cell under the first base station, where the second cell is a cell under the second base station, and the first cell and the second cell are adjacent cells;

The second base station determines a CRE offset value of the second cell to the neighboring cell according to the CRE offset value of the first cell to the second cell.

4. The method according to claim 3, further comprising:

The second base station receives the identifier information, where the identifier information is used to determine the neighboring cell.

5. A first base station, comprising:

a determining unit, configured to determine a CRE offset value of the first cell to the second cell; the first cell is a cell under the first base station, and the second cell is a cell under the second base station, where the a cell and the second cell are adjacent cells;

a sending unit, configured to send, to the second base station, a CRE offset value of the first cell to the second cell, where a CRE offset value of the first cell to the second cell is used by The second base station determines a CRE offset value of the second cell to the neighboring cell.

6. The first base station according to claim 5, characterized in that

The sending unit is further configured to send the identifier information to the second base station, where the identifier information is used to determine the first cell.

A second base station, comprising:

a receiving unit, configured to receive a CRE offset value of the first cell to the second cell that is sent by the first base station; the first cell is a cell under the first base station, and the second cell is a second base station a cell in which the first cell and the second cell are adjacent cells;

And a determining unit, configured to determine, according to the CRE offset value of the first cell to the second cell, a CRE offset value of the second cell to a neighboring cell.

8. The second base station according to claim 7, wherein:

The receiving unit is further configured to receive the identifier information sent by the first base station, where the identifier information is used to determine the neighboring cell.