Abstract: The disclosure discloses a method and device for forming a multi-cell beam. The method includes: a beam forming vector bq of each coordination cell in a heterogeneous network is calculated according to a principle of maximizing a signal intensity of a coordination cell scheduling user and minimizing a weighted interference leakage of the coordination cell scheduling user to other coordination cell scheduling users; and the beam forming vector bq of corresponding coordination cell is updated according to a calculation result, to enable each coordination cell to transmit data to a corresponding scheduling user according to updated beam forming vector bq.

Abstract: A method and device for detecting a signal of an LTE uplink system in an interference condition. The method comprises: receiving baseband signals of M receiving antennas, and after fast Fourier transform, conducting demapping to obtain frequency-domain baseband signals; extracting a DMRS inserted in a received signal of each antenna, and then, calculating a channel gain hl,k of each receiving antenna; combining the baseband signals and the channel gains of the M receiving antennas to obtain a signal matrix Yk and a gain matrix Hk; calculating an interference noise covariance matrix Rk on each subcarrier; conducting interference pre-processing on a received signal on each combined subcarrier to obtain the received signal (1) and the channel gain (2) after the interference pre-processing, where D=Rk?1/2; and according to (3), conducting frequency-domain balancing on the received signal after the interference pre-processing.

Abstract: A coordinated beamforming method and apparatus based on partial interference alignment, the method includes: selecting an optimal partial interference alignment mode from selectable partial interference alignment modes of terminals covered by base stations in a coordinating cluster of a coordinated multiple points transmission according to a chordal distance criterion; and transmitting, by the base stations, signals to the terminals by adopting the optimal partial interference alignment mode.

Abstract: Disclosed are a multi-antenna transmission method, a terminal and a base station, wherein, an eNB sends a UE a SRS transmission mode including new SRS transmission port information and/or a signaling for instructing the UE to perform antenna group alternate transmission as well as a control signaling required by the SRS transmission mode; the UE transmits a SRS using the abovementioned SRS transmission mode, and the eNB estimates a channel information according to the SRS and calculates and transmits a precoding matrix.

Abstract: The present disclosure provides a method for detecting a random access signal. The method includes: determining a temporary peak detection sequence according to a received time domain random access signal; determining an interference cancellation weight for a frequency domain cyclic shift sequence corresponding to a search window in the temporary peak detection sequence, and performing interference cancellation on the temporary peak detection sequence according to the interference cancellation weight, obtaining a final peak detection sequence; and performing peak detection on the final peak detection sequence. The present disclosure discloses an apparatus and system for detecting a random access signal at the same time. According to the method, the present disclosure can eliminate the deterioration of the leak detection performance and the false detection performance caused by the interference during the random access signal detection, improve the detection accuracy and save resources.

Abstract: A method and device for selecting a heterogeneous network serving cell based on inter-cell cooperation, which relate to the field of digital communications. The method disclosed in the embodiments of the present invention comprises: acquiring, by a central node base station in a heterogeneous network, alternative users in each cell in the heterogeneous network; and according to a pre-set alternative user selection criterion, selecting an alternative user in the entire network from the alternative users in all cells in the heterogeneous network; and if the alternative user in the entire network needs to conduct a reselection operation, initiating a cell reselection flow. Also disclosed is a device for selecting a heterogeneous network serving cell based on inter-cell cooperation corresponding to the method.

Abstract: A method and device for selecting a heterogeneous network serving cell based on inter-cell cooperation, which relate to the field of digital communications. The method disclosed in the embodiments of the present invention comprises: acquiring, by a central node base station in a heterogeneous network, alternative users in each cell in the heterogeneous network; and according to a pre-set alternative user selection criterion, selecting an alternative user in the entire network from the alternative users in all cells in the heterogeneous network; and if the alternative user in the entire network needs to conduct a reselection operation, initiating a cell reselection flow. Also disclosed is a device for selecting a heterogeneous network serving cell based on inter-cell cooperation corresponding to the method.

Abstract: The disclosure discloses a method and device for forming a multi-cell beam. The method includes: a beam forming vector bq of each coordination cell in a heterogeneous network is calculated according to a principle of maximizing a signal intensity of a coordination cell scheduling user and minimizing a weighted interference leakage of the coordination cell scheduling user to other coordination cell scheduling users; and the beam forming vector bq of corresponding coordination cell is updated according to a calculation result, to enable each coordination cell to transmit data to a corresponding scheduling user according to updated beam forming vector bq.

Abstract: A method and device for detecting a signal of an LTE uplink system in an interference condition. The method comprises: receiving baseband signals of M receiving antennas, and after fast Fourier transform, conducting demapping to obtain frequency-domain baseband signals; extracting a DMRS inserted in a received signal of each antenna, and then, calculating a channel gain hl,k of each receiving antenna; combining the baseband signals and the channel gains of the M receiving antennas to obtain a signal matrix Yk and a gain matrix Hk; calculating an interference noise covariance matrix Rk on each subcarrier; conducting interference pre-processing on a received signal on each combined subcarrier to obtain the received signal (1) and the channel gain (2) after the interference pre-processing, where D=Rk?1/2; and according to (3), conducting frequency-domain balancing on the received signal after the interference pre-processing.

Abstract: A method and base station for coordinated multi point data transmission are disclosed. The method includes: a base station receiving a per-cell CQI value reported by a UE; looking up an SINR-CQI mapping table according to the per-cell CQI value, and acquiring a subband/broadband SINR value; performing CQI recalculation according to the subband/broadband SINR value, and acquiring a recalculated subband/broadband CQI value; and selecting modulation and coding according to the recalculated subband/broadband CQI value to schedule data transmission. With the method and base station of the embodiments of the present document, in a CoMP system, in a joint transmission scenario, the accuracy of the CQI value used by the BS for scheduling is improved, and the oscillation during an AMC process is reduced.

Abstract: A method for detecting a random access signal includes: determining a temporary peak detection sequence according to a received time domain random access signal; determining an interference cancellation weight for a frequency domain cyclic shift sequence corresponding to a search window in the temporary peak detection sequence, and performing interference cancellation on the temporary peak detection sequence according to the interference cancellation weight, obtaining a final peak detection sequence; and performing peak detection on the final peak detection sequence. An apparatus and system for detecting a random access signal are also described.

Abstract: A random access method and random access system for a terminal in a high-speed mobile environment are provided. Wherein, the method comprises: selecting a random access preamble format according to a preset cell coverage radius target value; judging whether using a restricted set of cyclic shift quantities pre-configured satisfies a requirement of the cell coverage radius target value under the selected random access preamble format; if not satisfying, selecting a cyclic shift quantity which satisfies the requirement of the cell coverage radius target value from a unrestricted set of the cyclic shift quantities pre-configured; and generating a random access signal according to the cyclic shift quantity and a pre-configured mother code, and performing access using the random access signal. Through the above-mentioned technical scheme, the embodiment of the present document provides a more perfect random access method and random access system for a terminal in a high-speed mobile environment.

Abstract: A method, device and system for detecting a random access signal in an interference environment. The method includes: receiving a time-domain random access signal to obtain a frequency-domain random access signal; obtaining interference cancelling weights according to the frequency-domain random access signal and a frequency-domain local cyclic shift sequence, and performing interference cancelling on the frequency-domain random access signal with obtained interference cancelling weight; and performing peak detection on the frequency-domain random access signal after interference cancelling.

Abstract: A coordinated beamforming method and apparatus based on partial interference alignment, the method includes: selecting an optimal partial interference alignment mode from selectable partial interference alignment modes of terminals covered by base stations in a coordinating cluster of a coordinated multiple points transmission according to a chordal distance criterion; and transmitting, by the base stations, signals to the terminals by adopting the optimal partial interference alignment mode.

Abstract: A method and a base station for implementing coordinated beamforming are disclosed. The method includes: a base station acquiring a transmitting beamforming vector in a current time slot according to a receiving beamforming vector estimate value of each interference terminal; shared in a previous time slot; and each base station acquiring a receiving beamforming vector estimate value in the current time slot according to the transmission beamforming vector in the current time slot and an interference vector shared in the previous time slot, and sharing the acquired receiving beamforming vector estimate value and an interference vector in the current time slot. The technical scheme provided by the embodiment of the present document considers the receiving beamforming vector in an associated coordinated beamforming scheme based on a maximized SLNR criterion, and only two kinds of information, i.e.

Abstract: A method for acquiring a format of a random access subframe and a receiver are provided. The method includes: according to a cell radius supported currently and a cell coverage radius decided by the length of ZC sequence and the size of Ncs, a receiver determining the length of preamble sequence in an extended random access subframe; according to the cell radius supported currently and a cell coverage radius decided by the length of GT, determining the lengths of CP and GT in the extended random access subframe; according to sampling rates of a system where the receiver is located and the lengths of the preamble sequence and CP and GT, respectively calculating the numbers of sampling points of preamble sequence and GT and CP; based on the above numbers of sampling points, calculating the length of extended random access subframe, and determining the format of extended random access subframe.

Abstract: The embodiments of the present document provide a random access method and a receiver, wherein, the random access method includes: after starting up, a receiver performing cell search and downlink synchronization to obtain a time reference; the receiver obtaining a distance between itself and a base station; the receiver selecting a random access format according to parameters and a load condition of the system where it is located; the receiver obtaining a cell radius supported by the selected random access format, and calculating a line-of-sight transmission time delay if the cell radius is less than the distance; and based on the time reference, the receiver transmitting a random access subframe the line-of-sight transmission time delay in advance.

Abstract: Disclosed are a method and device for estimating a channel in a multiple-receiving antenna system. The method comprises: a channel estimation is performed on a received pilot signal by using a least square channel estimation algorithm to obtain an estimation value HLS; an N?-dimensional channel autocorrelation matrix formula (I) and a channel frequency domain autocorrelation matrix Ri from a transmitting antenna i to any receiving antenna are acquired, and a weight matrix W which is descrambled and denoised is calculated, wherein i=1, 2, . . . , NT, and NT is the number of antennae at a transmitting end; the estimation value HLS is corrected by using the weight matrix W to obtain a corrected estimation value HP-LMMSE. The method and device of the disclosure may obtain the performance as close as possible to the LMMSE technology through less prior statistic information, and have a simple implementation manner.

Abstract: Disclosed are a multi-antenna transmission method, a terminal and a base station, wherein, an eNB sends a UE a SRS transmission mode including new SRS transmission port information and/or a signaling for instructing the UE to perform antenna group alternate transmission as well as a control signaling required by the SRS transmission mode; the UE transmits a SRS using the abovementioned SRS transmission mode, and the eNB estimates a channel information according to the SRS and calculates and transmits a precoding matrix.

Abstract: A method and base station for coordinated multi point data transmission are disclosed. The method includes: a base station receiving a per-cell CQI value reported by a UE; looking up an SINR-CQI mapping table according to the per-cell CQI value, and acquiring a subband/broadband SINR value; performing CQI recalculation according to the subband/broadband SINR value, and acquiring a recalculated subband/broadband CQI value; and selecting modulation and coding according to the recalculated subband/broadband CQI value to schedule data transmission. With the method and base station of the embodiments of the present document, in a CoMP system, in a joint transmission scenario, the accuracy of the CQI value used by the BS for scheduling is improved, and the oscillation during an AMC process is reduced.