Method and device for determining PRACH (physical random access channel) sending power and method and device for responding to UpPCH (uplink pilot channel) message

Abstract

The embodiment of the invention discloses a method and a device for determining PRACH (physical random access channel) sending power and a method and a device for responding to an UpPCH (uplink pilot channel) message and relates to the technical field of communication. The invention aims to solve the problem that UE (user equipment) has relatively large deviation in open-loop sending power, so that a message sent by the UE through the PRACH cannot be correctly received by a network side base station or relatively large interference to other users is caused in the prior art. The method for determining the PRACH sending power comprises the following steps that: the UE acquires UpPCH power which is actually received by the base station and the PRACH power which is expectedly received by the base station; the UE acquires the UpPCH power path loss value according to the received UpPCH power which is actually received by the base station; and the UE determines the PRACH sending power according to the UpPCH power path loss value and the PRACH power which is expectedly received by the base station. The method and device can improve the PRACH receiving success rate of the base station or reduce relatively large interference to other users.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for determining the transmission power of a physical random access channel and a method and device for responding to an uplink pilot channel message. Background technique [0002] In the TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, time division synchronous code division multiple access) system, UE (User Equipment, user equipment) needs to access the base station on the network side. First, the UE needs to determine the Sending time and power, the feature code is sent at UpPTS (Uplink PilotTime Slot, uplink pilot time slot) or other uplink access positions designated by the system side base station through the UpPCH (Uplink Pilot Channel, uplink pilot channel) subchannel to the network base station; the transmit power of the UE is: [0003] P UpPch =L P-CCPCH +PRX UpPCHdes +(i-1)Pwr ramp (1) [0004] Among them, P...

AI Technical Summary

Problems solved by technology

When the UE has a relatively large positive deviation open-loop transmission power, although it has no effect on the correct reception of the PRACH by the Node B, that is, it has no effect on the random access success rate, but due to the large transmission power of the PRACH, it will affect the uplink time where the PRACH is located. Other users of the slot cause greater interference

will affect the system capacity

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