Simulcast-like base station and system of PDT system

Abstract

The invention discloses a simulcast-like base station and system of a PDT system. The base station uses a BBU and an RRU connected to the BBU. The RRU achieves signal coverage by using a SFN format. The downlink data of the simulcast-like base station of the PDT system is copied and synchronously transmitted in the signal coverage of all RRUs. The uplink data of the simulcast-like base station ofthe PDT system selects the received data between the RRUs. Thus, the base station solves the frequency point resource shortage and signal coverage problem of the PDT network, and reduces the PDT simulcast networking cost.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a PDT system-like simulcast base station and system. Background technique [0002] In the dedicated PDT (Police Digital Trunking, police digital trunking) communication system networking, in order to save PDT frequency resources and expand coverage, PDT simulcast networking is introduced, and all PDT base stations in the same area work at the same frequency. A network similar to the interconnection of base stations is formed. UE (User Equipment, user terminal) does not need to switch channels when moving in this simulcast area, and does not need to roam to re-register. The simulcast network coverage of the PDT system is as follows: figure 1 shown. figure 1 In the PDT system shown, there are a total of 3 base stations, and the 3 base stations use the simulcast network coverage of the frequency point f. The UE does not need to switch channels or roam between the 3 base statio...

AI Technical Summary

Problems solved by technology

For customers, the cost of deploying two PDT networks at the same time is relatively high, and the UE cannot automatically switch between the PDT cluster network (using different broadcast) and the PDT simulcast network

[0004] In ordinary PDT cluster network deployment, frequency planning is generally done first. Once the network deployment is completed, if it is found that there is no PDT network signal coverage in some areas or new coverage points need to be added, it is difficult to apply for new frequency points to add stations. Blind, or even if you are lucky enough to find a frequency point, it involves a series of system or terminal frequency update operations, which is difficult to solve using the existing PDT simulcast networking technology

[0005] In addition, for indoor coverage scenarios and linear coverage scenarios such as high-speed railways, subways, and tunnels, using the existing PDT simulcast networking technology, the cost is relatively high due to the increase in the number of base stations

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