Downlink transmitting system and switching method

Abstract

The invention provides a downlink transmitting system and a switching method. The downlink transmitting system comprises at least one digital intermediate frequency module group, at least one Tx port group, a plurality of PAs, at least one change-over switch and an antenna array; the plurality of PAs are connected with the antenna array, and the plurality of PAs are connected with all Tx ports included in the downlink transmitting system in a one-to-one correspondence mode. At least one digital intermediate frequency module group is in one-to-one correspondence with the at least one Tx port group, each Tx port group is connected with each digital intermediate frequency module in the corresponding digital intermediate frequency module group through a change-over switch, and each Tx port group comprises a plurality of Tx ports; the number of the digital intermediate-frequency modules included in each digital intermediate-frequency module group is equal to the number of the Tx ports included in the corresponding Tx port group, each change-over switch has at least two connection states, and the numbers of the digital intermediate-frequency modules started in the digital intermediate-frequency module groups connected with the change-over switch in different connection states are different.

Description

technical field [0001] The present application relates to the communication field, and more specifically, relates to a downlink transmission system and a handover method. Background technique [0002] Massive multiple-input multiple-output (Massive MIMO) technology is a key technology in the current fifth generation (5th generation, 5G) mobile communication system. This technology improves system throughput by deploying large-scale antenna arrays on network devices. However, since the Massive MIMO equipment adopts a large number of transceiver units (transceiver, TRx) (for example, adopts 32TRx or 64TRx), the energy consumption of the network equipment increases sharply. Especially in the case of low network equipment load, the opening of a large number of transmission (transmit, Tx) channels makes the energy efficiency ratio of the network equipment significantly lower than that of the medium and high load conditions. [0003] At present, in the downlink transmission syst...

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Problems solved by technology

However, in this way, in the process of closing a part of the Tx channel, the connection between the Tx channel and a part of the antenna array is also disconnected. In this case, the size of the antenna array will be reduced

The reduction in the size of the antenna array will lead to damage to the aperture of the antenna array and a decrease in the effective isotropic radiated power (EIRP) of the network equipment, resulting in varying degrees of loss in the performance and coverage of the network equipment.

[0004] In a hybrid beamforming (hybrid beamforming, HBF) downlink transmission system architecture, energy is saved by reducing the number of Tx channels, but the network equipment load is high Or when the vertical distribution distance of users relative to the ground is large, the performance of the HBF downlink transmission system architecture will be significantly worse than that of the DBF downlink transmission system architecture

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