User device switching method, device and system during base station configuration change

A technology for user equipment and base station configuration, applied in the communication field, can solve problems such as handover failure, reduced network handover performance, and affecting UE handover

Active Publication Date: 2014-10-15
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] It can be seen that when the base station uses AAS technology to split or merge cells, the topology of the network changes, that is, the adjacent relationship between cells in the area changes, which will inevitably affect the handover of the UE and reduce the handover performance of the network.
For example, before the cell splits, the neighboring base station triggers a handover to the target cell for a UE. When the UE tries to access the target, the target cell has been split, and the location of the UE is covered by a new cell that appears after the split of the target cell. Since the handover command contains the information of the original target cell, the UE cannot identify the new cell, and as a result cannot access the new cell, resulting in handover failure
After the handover fails, because the signal of the new cell is the strongest, the UE selects this new cell to try to reestablish the RRC connection. Since the base station does not have the reestablishment information of the new cell, the RRC connection reestablishment fails, and the UE enters the IDLE (idle) state, resulting in call drop. Poor impact on user service

Method used

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  • User device switching method, device and system during base station configuration change
  • User device switching method, device and system during base station configuration change

Examples

Experimental program
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Effect test

Embodiment 1

[0085] Due to the relatively high network load, the current base station decides to split the cell A into two cells A1 and A2 by adjusting the AAS to increase the total capacity of the system. The topology of the cell before the split is as follows: Figure 5a As shown, the cell topology after splitting is as follows Figure 5b shown.

[0086] Before performing the cell splitting operation, the base station sends a notification message to the neighboring base stations. When the base station receives a handover request during cell splitting, and the target is the splitting cell, it returns a handover preparation failure response.

[0087] Specifically, due to the heavy traffic load, the current base station (called base station A) decides to adjust the AAS mode and prepares to split cell A into two cells A1 and A2 to increase the capacity of the network. After splitting, the ECGI, PCI and The frequency point configuration is exactly the same as that of cell A, and the base s...

Embodiment 2

[0095] The base station decides to split the cell by adjusting the AAS, and split the cell A into two cells A1 and A2. The topology of the cell before the split is as follows: Figure 5a As shown, the cell topology after splitting is as follows Figure 5b shown.

[0096] Before performing the cell splitting operation, the base station sends a notification message to the neighboring base stations. When the base station receives a handover request during cell splitting, and the target is the splitting cell, it performs normal handover preparations and returns a handover preparation success response.

[0097] Specifically, due to the heavy traffic load, the current base station (called base station A) decides to adjust the AAS mode and prepares to split cell A into two cells A1 and A2 to increase the capacity of the network. After the split, the ECGI, PCI and The frequency point configuration is exactly the same as that of cell A, and the base station allocates or requests OAM...

Embodiment 3

[0105] Because the network load is relatively low, the system does not need too much capacity. At the same time, in order to reduce the mobility overhead of the system, the current base station decides to merge the two cells A1 and A2 into cell A by adjusting the AAS. The topology of the cell before the merger is as follows Figure 5b As shown, the combined cell topology is as follows Figure 5a shown.

[0106] Due to the light business load, the system does not need too high capacity. At the same time, in order to reduce the mobility overhead of the system, the current base station (called base station A) decides to adjust the AAS mode and merge the two cells A1 and A2 into cell A. The ECGI, PCI and frequency point configuration of cell A are exactly the same as those of cell A1, and cell A2 will disappear completely after the merger;

[0107] Before performing AAS mode adjustment, base station A sends a notification message to surrounding adjacent base stations B, C, D, E,...

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Abstract

The invention discloses a user device switching method, device and system during base station configuration change, and relates to the communication technology. When a base station determines that cell split or merge needs to be executed, a notification message is sent to an adjacent base station by the base station, the notification message carries the information of local cells to be split or merged and the information of cells to be generated, the adjacent base station prepares UE switching preparation according to the notification message, the switching request signalling includes the RRC reestablishment information of the cells to be generated or the merged cells, so the base station in which the cell split or merge condition occurs can reestablish RRC connection successfully according to the information, so the user call dropping can be avoided, and the influence of the base station configuration change and the user service quality can be reduced.

Description

technical field [0001] The present invention relates to communication technology, in particular to a user equipment switching method, device and system when base station configuration is changed. Background technique [0002] In the mobile communication system, with the introduction of Active Antenna System (AAS) technology, the network can increase or decrease the system capacity through dynamic cell splitting or merging based on the actual load conditions, so as to achieve on-demand Purpose. However, dynamic cell splitting or merging means the change of network topology, which will increase the probability of handover failure and reduce the performance of network mobility. [0003] In particular, AASs are usually designed to contain a finite number of multiple different lobe widths. AAS can control the downtilt and beam width to have a better resolution, and in some specific scenarios, the beam and downtilt can be adjusted according to the user's business mode, so as to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/08
CPCH04W36/08H04W36/22
Inventor 王彦鲍炜刘爱娟
Owner DATANG MOBILE COMM EQUIP CO LTD
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