Abstract: The present invention discloses an Internet of Vehicles (IoV) low latency communication method and also discloses an IoV terminal and an IoV system for implementing the low latency communication method. The present invention uses a combination of a macro node and access points to perform resource scheduling on services requested by the IoV terminal and reduce a network transmission latency and ensure data transmission reliability through optimization of a data transmission manner, high-efficient processing at a data network side, and stable access of edge users by using technologies such as fog computing, open loop communication, path diversity, and network slicing.

Abstract: The present invention discloses a vehicular network variable frame structure communication method, and also discloses a vehicular network terminal and a vehicular network system for implementing the variable frame structure communication method. The vehicular network variable frame structure communication method reduces a communication time delay by shortening a frame length. Meanwhile, aiming at complicated and variable channel environments of vehicular network and according to a current vehicle running road grade and a road congestion condition, the insertion density and insertion period of the reference signals in subframes are adaptively adjusted, thereby improving the reliability of the entire vehicular network system while reducing the communication time delay.

Abstract: The present invention discloses a vehicular network variable frame structure communication method, and also discloses a vehicular network terminal and a vehicular network system for implementing the variable frame structure communication method. The vehicular network variable frame structure communication method reduces a communication time delay by shortening a frame length. Meanwhile, aiming at complicated and variable channel environments of vehicular network and according to a current vehicle running road grade and a road congestion condition, the insertion density and insertion period of the reference signals in subframes are adaptively adjusted, thereby improving the reliability of the entire vehicular network system while reducing the communication time delay.

Abstract: The present invention discloses an Internet of Vehicles (IoV) low latency communication method and also discloses an IoV terminal and an IoV system for implementing the low latency communication method. The present invention uses a combination of a macro node and access points to perform resource scheduling on services requested by the IoV terminal and reduce a network transmission latency and ensure data transmission reliability through optimization of a data transmission manner, high-efficient processing at a data network side, and stable access of edge users by using technologies such as fog computing, open loop communication, path diversity, and network slicing.

Abstract: The present invention discloses a detection method, a synchronization method, and a terminal for a symmetrical synchronization signal. The detection method includes the following steps: obtaining a received signal of a synchronization signal for synchronous detection, and subsequently, performing an auto-correlation calculation on the received signal twice in the time domain, where the received signal includes a first-part received signal whose length is N and a second-part received signal whose length is NCP, the first-part received signal is symmetrical about a first central point, and the second-part received signal is symmetrical about a second central point. With low complexity of calculation and good detection performance, and being insensitive to a carrier frequency offset (CFO), the present invention is particularly applicable to an Internet of Things (IoT) environment.

Abstract: The present invention discloses a cell clustering method, used to classify multiple small cells into N clusters and including the following steps: based on throughputs, respectively placing N small cells having a largest interference with each other into the N clusters to initialize the clusters; and based on the throughputs, separately adding a small cell having a smallest interference with the clusters into the clusters, and repeating the step until all the small cells are allocated into the clusters. The present invention further discloses a spectrum overlapping multiplexing method based on the cell clustering method. According to the present invention, the cell system average spectral efficiency and the cell edge spectral efficiency in an ultra dense network can be improved.

Abstract: The present invention discloses a calibration method for parallel multi-channel wireless channel measurement and a calibration system thereof. The transmitting end and the receiving end are disconnected, and are respectively connected to the calibration receiving channel and the calibration transmitting channel, and the calibration receiving channel/calibration transmitting channel cooperates with a measurement channel in air interface measurement, to calibrate a channel response characteristic of the transmitting end and the receiving end. By means of the present invention, a current channel response characteristic between multiple channels can be online supervised in real time, so as to ensure that a measurement error because of an impact of mutual interference between multiple channels can be avoided in the channel measurement process.

Abstract: The present invention discloses a network optimization method for a large-scale MIMO network and a base station thereof. The base station enables, according to a user minimum SINR threshold of each user in a preset cell, instantaneous spectral efficiency of the cell at a specific moment to approximate or reach a maximum value. In the present invention, a newly added user minimum SINR threshold parameter is configured, and a characteristic of a concave function is used, so that average spectral efficiency and edge spectral efficiency of each cell are simply and effectively controlled, so as to achieve an objective of coordination adjustment of network capacity and network coverage.

Abstract: The present invention discloses an adaptive parameter adjustment method for a hybrid precoding millimeter-wave transmission system. The method includes the following step: interacting between a transmitter and a receiver for a number of radio frequency chains that need to be established. The receiver calculates, according to a received signal power at the time of established a different number of radio frequency chains and a total power consumption at the time of established the different number of radio frequency chains, the number of the radio frequency chains that need to be established. According to the present invention, under a condition of balancing power consumption and a rate, a number of radio frequency chains that need to be established is adaptively selected, so as to optimally configure power consumption and a transmission rate in a millimeter-wave transmission system.

Abstract: Disclosed are an inter-network shared frequency spectrum optimization system and method. In the optimization method, a frequency spectrum resource allocated to a first network in a shared frequency spectrum pool comprises a frequency spectrum resource occupied by an OPEN mode base station in a first cell cluster, and a frequency spectrum resource allocated to a second network in the shared frequency spectrum pool comprises a frequency spectrum resource occupied by an OPEN mode base station in a second cell cluster, wherein the frequency spectrum resource occupied by each OPEN mode base station in the first cell cluster and the frequency spectrum resource occupied by each OPEN mode base station in the second cell cluster have the same size. The present invention improves the frequency spectrum efficiency and the base station service quality are improved.

Abstract: A coordination method between access points using unlicensed frequency bands and a network control node using this method are disclosed. The method includes: the first access points adjusting transmission parameters thereof to increase channel access probability of the first access points; and the second access points adjusting transmission parameters thereof to decrease the channel access probability of the second access points; wherein the degree to which channel access probability of the third access points is decreased due to adjustment of the transmission parameters of all the first access points is equivalent to the degree to which the channel access probability is increased due to adjustment of the transmission parameters of all the second access points. Through coordination between multiple access points in the same network, fair coexistence with other networks using unlicensed frequency bands can be ensured while user QoS is improved.

Abstract: An Internet of things (IoT) device random access method based on a massive MIMO technology is disclosed, and a cellular IoT communication system using the random access method is also disclosed. In the method, multiples users access a base station by using the same preamble sequence, the users accessing the base station in different beams respectively. By use of narrow beam characteristics of a massive MIMO technology, users in different beams can use the same preamble sequence for random access, thus greatly reducing collision probability of the random access and greatly increasing the number of users of random access, and congestion and collision problems during random access of a great number of users in the cellular IoT communication system can be effectively solved.

Abstract: The present invention discloses a cellular-network-assisted wireless local area network (WLAN) channel switch announcement method, including the following steps: before a wireless network access point (AP) performs channel switching, delivering channel switch announcement signaling to correlated user equipment in a broadcast manner, and sending channel switch announcement request signaling to a cellular network base station that also serves the user equipment; after the cellular network base station receives the channel switch announcement request signaling, sending the channel switch announcement signaling to user equipment in an idle mode by using a cellular link air interface; and performing, by the WLAN AP, channel switching within a predetermined time, and following, by user equipment that directly acquires channel switch information by receiving the channel switch announcement signaling and user equipment that acquires channel switch information by using the cellular network base station, the WLAN AP an

Abstract: Disclosed is a network interference coordination method in a co-primary spectrum sharing scenario. The method comprises the following steps: a first network and a second network negotiate an inter-network shared band, the shared band being in a shared spectrum pool; the first network evaluates inter-network interference; the first network determines whether to perform internal coordination, if internal coordination is performed, the first network performs internal coordination; if internal coordination is not performed, request the second network to perform inter-network interference coordination; the second network determines whether to perform internal coordination, if internal coordination is performed, the second network performs internal coordination; and if internal coordination is not performed, go back to the step of negotiating, by a first network and a second network, an inter-network shared band.

Abstract: The present invention discloses an uplink resource scheduling method, and also discloses a corresponding terminal and base station. In the method, a base station calculates an uplink resource required to grant to a terminal by a base station according to a split bearer data ratio, and then performs uplink resource grant.

Abstract: An uplink pilot sequence allocation method in a massive MIMO system is disclosed, the system including the master base station in the master cell and a neighboring base station in a neighboring cell, including: the neighboring base station comparing a primary eigen-space between a user group of the neighboring cell and the neighboring base station, with an interference eigen-space between a user group of the master cell close to the neighboring base station and the neighboring base station, and determining whether the user group of the neighboring cell can reuse uplink pilot sequence resources used by the user group of the master cell. In a manner of increasing information exchange, intercell cooperative uplink pilot sequence allocation is achieved, and uplink pilot contamination in a multi-cell massive MIMO system is reduced effectively.

Abstract: The present invention provides a system and method for avoiding mobile relay interference to a primary system on an authorized frequency spectrum.

Abstract: The present invention discloses an uplink resource sharing method, base station and terminal, wherein, the uplink resource sharing method comprises: performing the LBT on a granted subframe, allocated to a terminal by a base station, by the terminal; transmitting data if the LBT is finished on the granted subframe; and performing the LBT on another subframe if the LBT is not finished on the granted subframe. The present invention solves the problem of resource waste caused by the fact that the terminal cannot finish LBT in a frame allocated to the frame by a base station, and reduces a probability of increase of an uplink grant number caused by failing of uplink scheduling.

Abstract: A hybrid monitoring-sleeping method of wireless sensor and the wireless sensor are provided by the present invention, during N (N=N1+N2) monitoring-sleeping period, the wireless sensor monitors with the first monitoring duration, the wake-up data packet transmitted by the data acquisitor or the mobile terminal in the N1 monitoring-sleeping periods, and the wireless sensor monitors with the second monitoring duration, the wake-up data packet transmitted by the mobile terminal in the remaining N2 monitoring-sleeping periods. The first monitoring duration is longer than the second monitoring duration, N1 is less than or equal to N2, and the N1 first monitoring duration and the N2 second monitoring duration are alternatively distributed. Compared with the single monitoring duration used in the prior art, the total monitoring duration of the N monitoring-sleeping periods is reduced, as a result, the monitoring power consumption of the wireless sensor is also reduced.

Abstract: The present invention discloses a detection method, a synchronization method, and a terminal for a symmetrical synchronization signal. The detection method includes the following steps: obtaining a received signal of a synchronization signal for synchronous detection, and subsequently, performing an auto-correlation calculation on the received signal twice in the time domain, where the received signal includes a first-part received signal whose length is N and a second-part received signal whose length is NCP, the first-part received signal is symmetrical about a first central point, and the second-part received signal is symmetrical about a second central point. With low complexity of calculation and good detection performance, and being insensitive to a carrier frequency offset (CFO), the present invention is particularly applicable to an Internet of Things (IoT) environment.