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Downlink power control method and device for switching

A power control and controller technology, applied in the field of communication, can solve the problems of affecting downlink channel power, handover failure, cell interference, etc.

Inactive Publication Date: 2008-04-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

If the target cell transmits with the maximum coverage power, it will cause interference to other UEs and other cells, and secondly, it will also affect the power of other downlink channels in the same slot of the target cell
If the transmit power of the target cell is too low, the UE may not be able to receive it correctly, resulting in handover failure

Method used

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  • Downlink power control method and device for switching
  • Downlink power control method and device for switching
  • Downlink power control method and device for switching

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Embodiment Construction

[0022] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] In the downlink power control method in the system handover method proposed by the present invention, the RNC calculates the path loss at the location of the UE according to the measurement results reported by the UE, maps the path loss value to the power control table, and uses a table lookup method, On the basis of the transmit power of the Primary Common Control Physical Channel (PCCPCH for short), the initial downlink transmit power of the corresponding target cell is adjusted to perform downlink power control.

[0024] refer to figure 2 As shown, the system switching method according to the present invention is described. The system handover method includes: S202, when the user equipment is handed over from the source cell to the target cell, the radio network controller initiates handover measurement to the user equipment and rece...

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Abstract

This invention discloses a down-power control method and a device used in switching, in which, the method includes the following steps: 1, when it's necessary for a UE to be switched to a target area from an original area, a radio network controller computes path loss between them, 2, the controller maps the loss onto a down-power control list to get corresponding initial emission power, 3, the controller emits a switch order containing the initial emission power information to the target area.

Description

technical field [0001] The present invention relates to the communication field, and more particularly relates to a downlink power control method and device for switching. Background technique [0002] During the handover process of a Time Division Synchronization Code-Division Multiple Access (TD-SCDMA) system, when a user equipment (User Equipment, UE) is handed over from a source cell to a target cell, the target cell It is difficult to determine the initial downlink transmission power, especially during the handover process, the UE initially only receives the downlink signal of the target cell, and the target cell cannot determine its initial transmission power. In this case, if the target cell transmits with the maximum coverage power, it will cause damage to other The interference between the UE and other cells, secondly, will also affect the power of other downlink channels in the same slot of the target cell. [0003] Specifically, in the handover process of the TD-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04Q7/38
Inventor 刘虎马毅华
Owner ZTE CORP
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