Cell reselection method and device applied to multi-carrier condition, method and device for reducing access load of cells

A cell reselection, multi-carrier technology, applied in the direction of network traffic/resource management, electrical components, wireless communication, etc., can solve the problem of increasing cell signaling load, heavy data transmission load and access load, and increased user access delay And other issues

Inactive Publication Date: 2017-01-04
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, with the development of multi-carrier technology and small cell (Small Cell) technology, the current network deployment environment is becoming more and more complex. In the same area, there may be three or more frequency coverage, and the coverage of different frequency cells In this network environment, the above cell reselection mechanism based on carrier frequency priority will cause all idle UEs to camp on the carrier frequency with the highest priority in a certain area. As a result, the data transmission load and access load of the cell working on this carrier frequency are too heavy, while the load of other cells with lower priority frequencies is lighter, and the purpose of load balancing cannot be achieved.
[0005] Under the technical framework of the current LTE system, for an overloaded cell, some UEs in the cell can be transferred to adjacent frequency cells by means of redirection or handover. However, the above two methods require UE-specific information. Instructions indicate that this will increase the signaling load of the cell. In addition, these two methods cann

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  • Cell reselection method and device applied to multi-carrier condition, method and device for reducing access load of cells
  • Cell reselection method and device applied to multi-carrier condition, method and device for reducing access load of cells
  • Cell reselection method and device applied to multi-carrier condition, method and device for reducing access load of cells

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Embodiment 1

[0118] In this embodiment, the cell load is calculated by the eNB, and the eNB notifies the UE of the load information of the currently camped cell and neighboring cells through signaling. At the same time, the eNB configures corresponding cell priority lists for UEs with different capabilities, such as Figure 5 shown. The UE obtains the neighbor cell list by receiving the signaling of the cell where it is currently camping, and the corresponding neighbor cell load, neighbor cell priority, and neighbor cell reselection probability. The UE reselects to a cell that meets the reselection conditions based on the above information. In this implementation Cells that meet the conditions of H4, E4 or L6 are cells that meet the reselection conditions. The specific implementation steps are as follows:

[0119] Step 1: The UE receives cell signaling, and obtains a list of neighbor cells, the priority corresponding to each neighbor cell, the reselection probability corresponding to eac...

Embodiment 2

[0129] In this embodiment, the cell load is calculated by the eNB, and the eNB notifies the UE of the load information of the currently camped cell and neighboring cells through signaling. The UE obtains the neighbor cell list by receiving the signaling of the cell where it is currently camping, and the corresponding neighbor cell load, neighbor cell priority, and neighbor cell reselection probability. The UE reselects to a cell that meets the reselection conditions based on the above information. In this implementation Cells that meet the conditions of H1, E1 or L1 are cells that meet the reselection conditions. The specific implementation steps are as follows:

[0130] Step 1: The UE receives cell signaling, and obtains parameters such as a list of neighboring cells, the corresponding priority of each neighboring cell, and the corresponding reselection probability of each neighboring cell.

[0131] In this embodiment, the reselection probability is a cell-specific parameter...

Embodiment 3

[0139] In this embodiment, when the cell is in an overloaded state, the eNB alleviates the access load of the cell by prohibiting services with high delay tolerance and rejecting paging requests with low priority. The specific implementation steps are as follows:

[0140] Step 1: The eNB updates the broadcast message, and includes at least delay tolerant access (delayTolerantAccess) in the cell access barring list (ac-BarringInfo).

[0141] Step 2: The eNB feeds back a paging request rejection message to the MME.

[0142] The paging request rejection message includes the index information of the paging request with low priority, and further includes the waiting time suggested by the eNB.

[0143] It should be noted that the sequence of step 1 and step 2 can be interchanged, and can be executed separately.

[0144] So far, this embodiment ends. Through the method of this embodiment, the access load of the cell can be further alleviated without affecting user experience.

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Abstract

The invention discloses a cell reselection method and device applied to a multi-carrier condition. According to the cell reselection method and device, UE adjusts cell reselection strategies according to acquired cell load information, priority information and other information, so that the problem of cell overload can be avoided; cell priority configuration related to the capabilities of the UE is introduced, so that UE supporting specific functions can preferentially reside in cells supporting the functions, and therefore, the improvement of user experience can be benefitted. The present invention discloses a method and device for reducing the access load of cells. According to the method and device for reducing the access load of the cells, as for cells where overload has already occurred, the current load of the cells can be effectively alleviated through limiting access requests or paging for services with high time delay tolerance. According to the cell reselection method, the cell reselection device, the method and device for reducing the access load of the cells provided by the technical schemes of the invention, the advantages of existing cell selection strategies are retained, and at the same time, the problem of load unbalance of the cells can be avoided; an existing system is just slightly modified, and the compatibility of the system will not be affected. The methods and devices have the advantages of simplicity in implementation and high efficiency.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically relates to a cell reselection method and a terminal capable of effectively balancing cell loads in a multi-carrier environment. Background technique [0002] In the current LTE network (Release-12), after the UE completes the initial cell selection, it receives the broadcast message of the cell, obtains the cell reselection priority information of the current cell frequency (ie, the service carrier frequency), and obtains the cell frequency of the neighboring cell at the same time list (referred to as neighbor frequency list), for each neighbor frequency in the neighbor frequency list, the system message includes the corresponding cell reselection priority information and the corresponding cell reselection threshold, and the UE performs cell reselection according to the above information. In the process of cell reselection, if the reselection priority ...

Claims

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Application Information

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IPC IPC(8): H04W36/00H04W36/30H04W28/08H04W72/12
CPCH04W36/0061H04W36/30H04W28/08H04W72/52
Inventor 张世昌许丽香王弘王轶
Owner BEIJING SAMSUNG TELECOM R&D CENT
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