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Open ring power control method for base station and its physical random cut-in channel

A physical random access, open-loop power technology, applied in transmission control/equalization, power management, wireless communication, etc., can solve problems such as system capacity impact, and achieve the effect of accurate open-loop power control

Active Publication Date: 2007-06-27
DATANG MOBILE COMM EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] What the present invention aims to solve is the problem that the open-loop power control method of P-RACH in the prior art affects the system capacity when improving the success rate of receiving P-RACH by the base station

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  • Open ring power control method for base station and its physical random cut-in channel
  • Open ring power control method for base station and its physical random cut-in channel

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Embodiment Construction

[0039]In the TD-SCDMA system, user terminals in idle mode maintain downlink synchronization and read cell broadcast information. From the SYNC-DL (Synchronous Downlink, downlink synchronization code) code used by DwPTS (Downlink Pilot Time Slot, downlink pilot time slot), the user terminal can obtain 8 SYNC UL (Synchronous Uplink, Uplink synchronization code) code set; from the BCH (Broadcast Channel, broadcast channel), the user terminal can obtain information about P-RACH, FPACH (Fast Physical Access Channel, fast physical access channel) and S-CCPCH (Secondary Common Control Physical Channel, auxiliary public control physical channel) some parameters of the channel, such as code, spreading factor, midamble, time slot, etc. The broadcast information on the BCH includes the expected UpPCH reception power PRX at the cell receiver UpPCH，des , is set in the system information block by the RNC (Radio Network Controller, radio network controller), and is periodically resent at th...

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Abstract

This invention discloses a P-RACH open-loop power control method in the TDD system including: a base station gets the expected receiving power of the UpPCH from a radio network controller to test its actual receiving power of user terminal UpPCH, compensating the P-RACH expected receiving power of said user terminal based on the difference of the expeted and actual receiving power. This invention also discloses a base station using said method and can modify the user terminals with open power control at the positive deviation and negative deviation suitably.

Description

technical field [0001] The invention relates to open-loop power control in a time-division duplex system, in particular to an open-loop power control method for a physical random access channel and a base station applying the method. Background technique [0002] In the TD-SCDMA (Time Division Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Multiple Access) system, closed-loop power control is adopted for the transmission power of the dedicated channel. For the initial transmission power of some channels, an open-loop power control method is adopted, such as the transmission power of a user terminal (User Equipment, user terminal) on a P-RACH (Physical Random Access Channel, physical random access channel). [0003] The transmit power of the user terminal on the P-RACH is determined by formula (1): [0004] P tx，PRACH = L P-CCPCH +P RXPRACH，des +(i UpPCH -1)×Pwr ramp ………………(1) [0005] In formula (1), P tx，PRACH is the transmit powe...

Claims

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Application Information

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IPC IPC(8): H04B7/005H04Q7/30H04W52/14H04W52/50
CPCH04W52/146H04W52/50
Inventor 樊锋葛阳中
Owner DATANG MOBILE COMM EQUIP CO LTD
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