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Inter-cell switch method in base station and data transmission device in switch process

An inter-cell and intra-base station technology, applied in the field of communication, can solve the problems of data discarding and reducing the real-time performance of data, and achieve the effect of preventing excessive cache, good data transmission, and data transmission control.

Active Publication Date: 2008-03-12
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when an HSDPA terminal performs cell handover while buffering a large amount of unsent data in the NodeB, if the terminal directly switches to a new cell, all the data buffered in the NodeB will be discarded.
[0005] In addition, when performing intra-NodeB cell handover, when the UE just enters the target cell, it may not be able to get a scheduling opportunity immediately, that is, the terminal may start sending data on the air interface when the air interface quality improves after switching to the target cell. Therefore, during the handover process of the terminal, when the air interface cannot send data to the UE, the RNC is still sending data to the NodeB, and the amount of cached data in the NodeB will increase sharply during this period and reduce the real-time performance of the data.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0038] When a terminal is handed over from one cell to another, the downlink data is also handed over from the MAC-hs entity of one cell to the MAC-hs entity of another cell. From the signaling flow of the IUB port, the whole process can be divided into two parts, that is, the reconfiguration preparation process and the reconfiguration submission process.

[0039] The relevant processing of the reconfiguration preparation process is shown in Figure 1, and the details are as follows:

[0040] Step 101, RNC sends NBAP synchronous reconfiguration preparation message to NodeB, informs NodeB that the HSDPA terminal in the source cell is ready to be handed over to the target cell from the source cell;

[0041] Step 102, the NBAP entity inside the NodeB configures the relevant information of the terminal to the MAC-hs entity of the target cell, and at the same time configures the RL_ID and CELL_ID of the terminal in the source cell to the MAC-hs entity of the target cell, and configu...

Embodiment 2

[0051] As shown in Figure 3, NB-NBAP in the figure is the NBAP (Node B Application Part, Node B Application Part) entity inside the NodeB, which is mainly used for IUB port signaling interaction, and the RNC configures the NodeB through this protocol entity. ; NB-source MAC-hs is the MAC-hs entity of the NodeB internal handover source cell; NB-target MAC-hs is the NodeB internal handover target cell MAC-hs entity.

[0052] The specific process is described as follows:

[0053] Step 301, RNC sends NBAP synchronous reconfiguration preparation message to NodeB, informs NodeB that the HSDPA terminal in the source cell is ready to switch to the target cell;

[0054] Step 302, the NBAP entity inside the NodeB configures the relevant information of the terminal to the MAC-hs entity of the target cell, and at the same time configures the RL_ID and CELL_ID of the terminal in the source cell to the MAC-hs entity of the target cell, and configures the MAC-hs entity of the source cell. T...

Embodiment 3

[0062] On the basis of the second embodiment, when data is switched in the NodeB, a timer can be used to avoid data switching failure.

[0063] When the reconfiguration is submitted, in order to prevent abnormalities in the data switching process, that is, if the target cell has not received the switching data from the source cell, in order to increase protection, in the target cell, the terminal will start a timer to wait for After the switching data is completed, if the switching data is not received after the timer expires, the switching data is identified as abnormal, and the RL starts new flow control and scheduling in the target cell and starts HSDPA service processing without continuing to wait.

[0064] It should be noted that the timer time depends on the approximate length of time required for data switching. Due to the difference in base station architecture, if the MAC-hs corresponding to multiple cell processing belongs to the same board, the process of switching ...

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Abstract

The invention provides a switching method between cells in the base station. When the HSDPA service terminal is performed with cell switching, the internal queue buffer data in the source cell MAC-hs entity and the correlative information are transferred into the target cell MAC-hs entity. In addition, the invention also provides a data transmission device during the switching process between cells in the base station, the device comprises a first storage unit and a second storage unit, which are respectively arranged in the source cell MAC-hs entity and the target cell MAC-hs entity, and used for the storage of the downlink data of the HSDPA service terminal; a transmission unit, which is used for the effective time point appointed by the base station, and queue data buffered by the first storage unit is transferred and stored in the corresponding queue of the second storage unit. The invention can effectively prevent the buffer data loss during the switching process, and control the data transmission between the RNC and the NodeB.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method for handover between cells in a base station and a data transmission device in the handover process. Background technique [0002] In a High Speed ​​Downlink Package Access (HSDPA, High Speed ​​Downlink Package Access) system, there may be multiple cells in a base station (NodeB), and each cell has a high-speed downlink packet access medium access control (MAC-hs, medium access control for HSDPA) entity. Because the MAC-hs entity is based on the cell, when the HSDPA terminal is switching cells within the NodeB, the terminal will switch from the MAC-hs entity of one cell to the MAC-hs entity of another cell. Due to the change of the MAC-hs entity to which the terminal belongs, during the handover process, the information of the terminal needs to be synchronized from the source cell to the target cell in time. [0003] The downlink data processing mechanism of HSDPA bus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04B7/26H04W28/14H04W36/08
Inventor 许芳丽
Owner DATANG MOBILE COMM EQUIP CO LTD
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