DTX detection method and device for LTE system PUCCH

Abstract

The invention discloses a DTX detection method and device for an LTE system PUCCH, and mainly aims to provide a DTX detection method and device for the LTE system PUCCH, wherein the detection method is simple in calculation and convenient to implement. The detection method includes the steps that a time delay power spectrum corresponding to a subframe is transmitted so as to calculate all spreading code blocks, and each spreading code block is a set of users using the same spreading code; time delay power values of all the users are extracted from the time delay power spectrum, and a peak detection threshold is calculated according to the time delay power values of the users and an obtained relative threshold value; DTX detection is carried out on all the users according to the peak detection threshold. In the processes of solving the time delay power spectrum and a noise floor, incoherent windows such as all time slots, all antennas, data symbols and pilot symbols are considered, as the time delay power values of all the users are already extracted when the noise floor is solved, it is unnecessary to calculate the time delay power values of the users when DTX judgment is carried out on the users, the calculation process is simplified, and the detection method is convenient to implement.

Description

technical field [0001] The invention relates to a detection method and device for a PUCCH channel DTX of an LTE system. Background technique [0002] The LTE system is a quasi-4G wireless communication technology standard of 3GPP. Its physical layer channels are divided into uplink channels and downlink channels. The HARQ feedback information ACK / NACK and resource scheduling request SR of the downlink data channel information will be sent on the uplink control channel PUCCH format 1 / 1a / 1b for transmission. Due to problems such as scheduling and resource requirements, the terminal may have discontinuous transmission behavior, that is, DTX, and the base station does not have CRC check behavior when receiving PUCCH format1 / 1a / 1b. Therefore, it is necessary to exclude DTX before making ACK or NACK judgments. Otherwise, if the base station Determining DTX as ACK or NACK will cause scheduling confusion and affect system throughput performance. In severe cases, terminals will fre...

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Problems solved by technology

Moreover, this method introduces the calculation noise of the orthogonal spreading codes that are not scheduled by the base station, so that only the noise power of the data symbols can be counted, and the noise power of the pilot symbols is lost. In addition, this method is more suitable for the base station to schedule a large number of users. For example, 1 RB schedules 36 users. However, most of the scenarios currently studied by the company are 18 users or less than 18 users scheduled for 1 RB. In this case, the amount of calculation is increased.

For the above second method, the method of using RSRP does not make full use of the data symbol information; and for all symbol powers accumulated and then averaged or first averaged and then accumulated, the starting point is to make the signal power of each combining window the same, and the signal-to-noise ratio SNR As a threshold, but making the data symbols and pilot symbols have the same power will cause their noise power to be different

For the above-mentioned third method, the starting point is to unify the noise power of different combining windows, but first of all, the statistical noise power needs to count the users corresponding to all idle channels as noise, and the calculation process is complicated. It does not explain how to combine the power of data symbols and pilot symbols, and its algorithm setting scenario is mainly to optimize the burst interference between time slots or unbalanced antennas. This situation is common in wireless communication It is not common, and the instantaneous noise power of each combining window is unified in the subframe, which also changes the real noise statistical characteristics

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