Method for controlling power of forwarding link in use for circuit switching in TD-SCDMA

A TD-SCDMA, forward link technology, applied in the field of circuit switched forward link power control, can solve problems such as multi-power, poor reception quality, system capacity reduction, etc., achieving simple processing flow, good versatility, The effect of fast convergence

Inactive Publication Date: 2006-02-01
诺基亚西门子通信网络科技服务有限公司
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  • Application Information

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Problems solved by technology

However, due to the excessive power occupied during the execution of the first few power control commands, the power control commands of the last few UEs cannot meet the conditions of the maximum power limit of the base station. Low power to other users, poor reception quality
The user signal with high power will cover up the user signal with low power, that is, the so-called "near-far effect" will still be produced, which further leads to a decrease in the capacity of the system

Method used

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  • Method for controlling power of forwarding link in use for circuit switching in TD-SCDMA

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings. Here we give two embodiments in which the power control command from the user is different.

[0024]In Embodiment 1, when the TD-SCDMA system is initialized, the maximum transmission power (max_tx_dl_tsx) allowed by one time slot of the forward link of the base station can be set in the operation and maintenance (OM, Operating Maintenance), which is assumed to be 20dBm here; Maintenance also needs to set the allowable dynamic range (rel_dyn_range) of the transmit power difference between any two users in a time slot on the forward link of the base station (rel_dyn_range), which is assumed to be 4dB here. The transmit power (Tx_pwr) and forward link power adjustment step (Pstep_dl) of each user in the previous frame are recorded in the Node B of the base station. Assuming that there are 4 users in the same time slot, the transmit powers of the above 4 users are 14dBm, ...

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Abstract

The method includes steps: comparing sum of transmission power of all channels in time slot of forwarding link with maximal transmission power in base station; if the result is larger, next, seeking out the user with maximal transmission power in users in current time slots; then, reducing power with one step length, and repeating the procedure till the said sum is less or equal to maximal transmission power in base station. Then, the method carries out following steps further: comparing the difference between transmission powers of any two channels in current time slot with allowable dynamic range; if the result is larger, seeking out the user with minimal transmission power in users in current time slots; then increasing power with one step length; and repeating the procedure till the said difference is smaller than or equal to allowable dynamic range. Comprehensive considering power control commands of each UE in a time slot, the invention meets power requirement for each UE.

Description

(1) Technical field [0001] The invention relates to a method for adjusting transmission power in a mobile communication system, more specifically, relates to a method for controlling forward link power of circuit switching in a TD-SCDMA system. (2) Background technology [0002] In a CDMA system, all users use the same frequency radio channel. If the transmit power of each terminal user equipment (UE, UserEquipment) is the same, due to the different distances between them and the base station, the strong signal of the user close to the base station will cover the weak signal of the user far away from the base station, which is called "Near and far effect". In addition, unlike FDMA's noise-limited system, CDMA is an interference-limited system, that is, a user in this system can improve its own communication by increasing its own transmission power, but at the same time it will bring greater interference to other users, which will eventually lead to a decrease in system cap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04J13/00H04W52/16H04W52/36
CPCY02D30/70
Inventor 肖磊罗启静赵玉霞黄浩学
Owner 诺基亚西门子通信网络科技服务有限公司
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