A kind of open-loop power control method and device

Abstract

Disclosed in the embodiments of the present invention are an open loop power control method and apparatus, used for saving transmission power and improving the success rate for establishing links in extreme channel environments. The method of the embodiments of the present invention is: in an open loop power control phase of a downlink DPCH channel, determining the open loop transmission power of the current power ramp period, and detecting the synchronisation state of the uplink DPCCH channel paired with the downlink DPCH channel; when determining that the synchronisation state of the uplink DPCCH channel is unsynchronised, then according to a preset power ramp step size, raising the open loop transmission power of the current power ramp period to obtain the transmission power of the next power ramp period; and when determining that the synchronisation state of the uplink DPCCH channel is synchronised, ending the open-loop power control phase.

Description

technical field [0001] The present invention relates to the communication field, in particular to an open-loop power control method and device. Background technique [0002] The 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) protocol stipulates that the initial transmit power of a downlink Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol, DPCH) channel is controlled by the NodeB in open-loop power. After the synchronization of the uplink and downlink DPCH channels is completed, the power control of the downlink DPCH performs closed-loop power control according to the transmission power control (Transmission Power Control, TPC) field of the uplink DPCH channel paired with it. [0003] In the prior art solution, the initial open-loop power is generally based on the ratio (Energy Chip / Noise , Ec / No) and the Ec / No required by the current service are comprehensively estimated, and then a certain transmit power margin is adde...

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Problems solved by technology

[0004] However, due to the fixed open-loop transmit power control, the over-guaranteed initial transmit power remains unchanged during the open-loop power control. On the one hand, for most UEs, although the open-loop power The control time is short, but as the penetration rate of current smart terminals increases, the UE changes from the forward access channel (Forward Access Channel, FACH) state to the dedicated channel (Dedicated Channel, DCH) state and from the paging channel (Panging Channel, PCH) The switching to the DCH state is extremely frequent, resulting in the waste of power caused by the open-loop power control when a large number of DPCH channels are established; on the other hand, for a small number of UEs, the downlink transmission power may be lower than the required power, resulting in Wireless link establishment failed

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