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Method and device for setting target SINR (Signal-to-Interference and Noise Ratio) in PUSCH (Physical Uplink Shared Channel) power control
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A power control and target technology, applied in the field of communication, can solve problems such as unsatisfactory power, affecting system performance, and adjusting transmission power
Active Publication Date: 2012-02-01
DATANG MOBILE COMM EQUIP CO LTD
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The three interact to a certain stage, and the power will not meet the performance requirements of the selected MCS level, resulting in block errors
Although the power control process can also judge this situation and trigger the TPC command word to increase the transmit power of the UE, but because the downward correction of the CQI is relatively fast, when the TPC command word actually takes effect, the MCS level has been lowered by several levels. Compared with the SINR corresponding to the increased transmit power after the TPC command word takes effect and the target SINR corresponding to the MCS that has been reduced due to the downward correction of the CQI, it is often necessary to reduce the power, and the subsequent upward correction due to the CQI correction function is slower than the power control. The speed of reducing the transmit power, so the overall effect is that the MCS level has dropped by several levels compared with the initial level, and the UE transmit power has also dropped by several dB
When the PUSCH SINR measurement value is higher than the target SINR corresponding to the MCS level selected by the current power control, repeat the previous change process again. After this situation occurs several times in succession, the MCS level will drop to the QPSK range. When the PUSCH SINR measurement value is much higher than the target SINR value, the power down control command word will always be generated, and the transmit power will be adjusted to the minimum, and the MCS will also adapt to 0, which will affect the system performance.
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Embodiment 1
[0080] Ideally, the uplink path loss PL can be considered UL and downlink path loss PL DL equal, that is, assuming that the downlink path loss PL on the UE side DL The measurement is accurate, and when the uplink PUSCH transmission power is not limited (that is, the maximum allowed uplink PUSCH transmission power is not reached), take Δ TF When (i)=0, the transmit PSD of the UE is: PSD PUSCH_T (i)=P O_PUSCH (j)+α(j)·PL DL .
[0081] The signal power received by the base station is:
[0082] psd PUSCH_R (i) = PSD PUSCH_T (i)-PL UL =P O_PUSCH (j)+(α(j)-1)·PL UL
[0083] At this time, it can be determined that the expected received power value of the base station is equal to the average received power of the base station in the previous cycle, that is, the average value of the difference between the terminal uplink PUSCH transmit power and the uplink path loss in the previous cycle, that is
[0084] PSD PUSCH _ ...
Embodiment 2
[0099] In a non-ideal situation, the expected receiving power value of the base station can be determined according to the average uplink PUSCH receiving power of the base station in the previous cycle.
[0100] That is, the downlink path loss PL DL When the measurement is inaccurate, or the uplink and downlink reciprocity is not strong, and the power amplifier has nonlinear error, the uplink path loss PL UL Not equal to downlink loss PL DL , at this time, the actual received SINR of the uplink PUSCH data received by the eNB side each time in subframe i is:
[0104] In order to make the receiving SINR on the eNB side tend to the target SINR, that is, the SINR receive ≈SINR target In the uplink PUSCH power control algorithm, the error is corrected by the closed-loop parameter f(i). At this time, it can be determined that the expect...
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Abstract
The invention discloses a method and a device for setting a target SINR (Signal-to-Interference and Noise Ratio) in PUSCH (Physical Uplink Shared Channel) power control and relates to a communication technique. According to the method provided by the embodiment of the invention, an expected receiving power value of a base station is confirmed according to an average uplink PUSCH receiving power of the base station in a previous period, and then the target SINR is confirmed according to the expected receiving power value of the base station and a total uplink interference. The target SINR is changed in real time by use of the average uplink PUSCH receiving power of the base station, thereby avoiding the confliction of a plurality of adjusting processes and enhancing the performance of a communication system.
Description
technical field [0001] The present invention relates to communication technology, in particular to a method and device for setting target SINR in PUSCH power control. Background technique [0002] The LTE (Long Term Evolution, long-term evolution) system uses OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology as the basis for packet data transmission. The interference between them is too high, resulting in the degradation of system performance. [0003] According to whether the transmission power is determined by the sender or the receiver, power control can be divided into two types: open-loop power control and closed-loop power control. The way in which the sender determines its transmit power based on its knowledge of the channel is called open-loop power control. The advantage of open-loop power control is that no additional signaling overhead is required; however, the disadvantage is that the understanding of the c...
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