Power control method in communication method and its system

Abstract

The invention relates to a power control method in communication system, wherein it comprises that: obtaining the error code rate of data speed control channel and the error pack rate of reverse service channel; comparing said error code rate, error pack rate, and target error code rate and error pack rate, while any one of target rates is higher, improving the power control threshold value; based on said threshold value, processing inner loop power control. The invention adjusts the access terminal emission power, to confirm the quality of DRC channel; therefore, the service area can install relative data pack via the speed requested by access terminal, to hold high forward chain throughout.

Description

technical field [0001] The present invention relates to a communication method and system thereof, in particular to a power control method and system thereof in the communication system. Background technique [0002] Referring to Fig. 1, in CDMA2000 1x EVDO technology, AT (Access Terminal, access terminal) 100 sends rate request to AN (Access Net, access network) 200 in real time through reverse channel, AN 200 according to the rate of AT 100 request And the forward scheduling policy determines the forward data packet format. The AT 100 decides which sector in the AN 200 to request data according to the wireless environment and the PER (Packet Error Ratio) of the forward data packet. AT 100 then sends the sector ID and rate ID to AN 200 through a DRC (Data Rate Control, data rate control, including sector ID and rate ID) channel. [0003] The sector selected by the AT 100 is called the serving sector, and this sector is generally the sector with the best forward link among...

AI Technical Summary

Problems solved by technology

[0008] Second, the front and reverse links are unbalanced

At this time, the transmit power of AT 10 has not reached the maximum, that is, there is still power remaining

The reverse link corresponding to the first BTS 21 is very poor, and the received DRC cannot be demodulated correctly, but the reverse link corresponding to the second BTS 22 is good, and AT 10 will not increase the transmit power

Thus affecting the first BTS 21 to assemble the forward data packet, reducing the forward throughput

The problem will be more prominent if there are multiple BTSs serving AT 10 at the same time

[0009] 3. Similar to situation 2, but the transmission power of the AT has reached the maximum and cannot continue to increase the transmission power

[0012] But above-mentioned first kind of prior art method does not fundamentally solve the problem:

[0013] 1) If the reverse pilot channel cannot be captured by the base station, even if the DRC channel power is high, it still cannot be demodulated by the base station

When the signal fading is severe, it still cannot solve the problem of poor DRC channel quality

Because the base station first needs to capture the reverse pilot channel, and then can demodulate the traffic channel or DRC channel. If the power of the mobile phone is not increased in time during deep fading, the base station cannot capture the reverse pilot channel, and cannot demodulate the traffic channel and DRC channel.

[0014] 2) Wasting AT power

The BTS forward packet does not refer to the DRC channel of the AT, and cannot refer to the wireless environment where the AT is located, and cannot achieve multi-user gain

[0019] 3) Cannot monitor the change of AT's service sector

If the AT selects another sector as the serving sector and sends it to each base station of the AN through the DRC channel, but the serving sector cannot be demodulated correctly and cannot obtain the information of the AT change in time

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