## 4 Discussion  
In this study, BeiDou RDSS technology was applied to the process of firefighting operations in forests. In designing a local self-organized network terminal, Zigbee networking technology was used to divide the logical structure of nodes undertaking different tasks and realize automated collection of various kinds of parameters, so as to reduce the workload of on-site firefighters. In designing the satellite communication network terminal, the satellite communication network terminal uses BeiDou RNSS positioning technology (Provided by  
Figure 8: **(a)** Overall SNR performance of 10 channels; **(b)** SNR for positive channels; **(c)** SNR for ordinary channels; **(d)** SNR for negative channels; **(e)** SNR for silent channels.  
China's Beidou satellite navigation system) to determine the geographic coordinates of the fire site and BeiDou RDSS technology to send and receive message data.  
In order to test the link quality and packet loss rate of the local self-organized network, we used the LQI, which has high reliability, and analyzed the link quality in different environments with different stump volume, and with packets sent and received continuously. In order to test the link quality and packet loss rate of the satellite communication network, the SNR of 10 channels was determined by simulating the satellite communication process and categorized into different levels of activity, and packets were sent and received at different moments.  
The performance experiment of this system used an LF1352 JP tracked firetruck, but other types of firetrucks are used as the main firefighting vehicles in the forested areas of Southwest China (Sichuan, Yunnan, and Tibet) [52; 53; 54]. Since the system uses highly integrated connections and rich interfaces, it can also be embedded into other types of firetrucks.  
In addition, since the civil smart card of BeiDou-3 was not available for civil application as a two-way card until now, and only the one-way smart card could be applied, the two-way civil smart card of BeiDou-2 was used in this experiment [55]. Although the performance of communication services provided by BeiDou-3 is more stable compared to BeiDou-2, its tariff is higher, and BeiDou-2 will not stop being maintained and the official government has not released any adjustment to the number of channels of BeiDou-2. Therefore, BeiDou-2 can still provide services for forestry firefighting operations for a long time [56].  
In the overall testing strategy, there was a lack of different geographic locations as references for system performance testing, and insufficient comparison samples and repetitive trials in some of the experiments [57]. In future work, we will continue to refine the functional division of the forest fire emergency communication system and develop new technology, including plans to improve the performance and applicability of the system. In addition, due to the special operating environment in forested areas, shading by trees can cause attenuation of the signal. This attenuation can be affected by leaf morphology and depression, etc. In order to ensure the singularity of the test variables, the experiments were set up so that there is always line-of-sight propagation between the terminal and the satellite, and enough redundancy was left to cope with the loss caused by tree shading. In future studies, we will further analyze the extent of attenuation of the signal caused by factors such as foliage morphology and degree of depression in order to improve the analysis of the system performance.