# Coexistence of 5G/6G and Digital Terrestrial Television Networks
## 3 Results of the Analysis
### Frequency Splitting for IMT and DTT  
In this chapter, the outcomes of dividing the frequency range of 470-694 MHz into an IMT part (606-694 MHz) and a DTT part (470-606 MHz) are presented. The current arrangement of channels and their respective reservation areas, which represents a modification of the plan in line with international agreements as per GE06, specifically for Poland, is illustrated in Figure 1. The existing channel plan for all multiplexes had to be adjusted due to the alteration in the number of available channels after reducing the bandwidth used and restricting it to 470-602 MHz. To accommodate six multiplexes within a narrower frequency range, it was necessary to modify the current reservation areas (particularly by increasing their size) and to reassign individual channels to the appropriate multiplexes. Simultaneously, it was essential to limit the maximum size of the SFN network to approximately 300-400 km, as larger areas could generate a significant level of SFN self-interference, making it impossible to sustain the proposed mode of operation and the expected bitrate. The channel allocations required substantial modifications. Firstly, the number of channels was reduced from the currently used 28 channels to 17 due to the allocation of the 600 MHz band for IMT networks. When configuring the new channel system, efforts were made to create areas that would have as minimal impact on internal network interference as possible, and the positioning within the country for individual multiplexes would minimize the effect of co-channel interference. As a result of the spectrum allocation analyses, an optimal plan for the use of individual channels was established, which is presented in Figure 2. In this arrangement, the areas of use for individual frequency bands were significantly extended. The anticipated regionalization of the special case of the multiplex 3 (MUX3) emissions (required for the case of regional public broadcaster), for which the maximum area of frequency use is one voisvodeship, was also considered. Furthermore, to help reduce mutual interference between SFN networks, efforts were made to assign a given TV channel to the same multiplex, which allows for nationwide synchronization of the resulting wide-area SFN network. Due to the analytical approach and only a preliminary assessment of the feasibility of implementing such a solution, no reference was made to any required changes in the channel system of neighboring countries, which would have to undergo an appropriate arrangement procedure (and likely will then) if a decision is made to allocate the 606-694 MHz frequency range to IMT systems. Figure 1: The current channel allocations of the six multiplexes MUX1–MUX6 in Poland for the frequency range 470–694 MHz (28 channels); color-coded allotment areas with the TV channel numbers. The proposed layout of channel allocations was subsequently verified in detail for compatibility between the various multiplexes. This was performed by checking the  
Figure 2: The proposed (as a result of the analyses) modified channel allocations for the new six nationwide multiplexes within the frequency range of 470–602 MHz (sixteen 8 MHz channels) are presented, with the allocation areas marked with colors and TV channel numbers. appropriate geographical separation of frequency use areas in the same TV channels. Additionally, in the next step, detailed planning analyses were conducted to confirm the practical feasibility of implementing these plans. Detailed results of planning analyses for all multiplexes, affirming such possibilities, were obtained. Examples of the results are presented below. A detailed analysis of the network plan was carried out using data on the actual broadcasting sites of the network operator, multiplex parameters, and appropriate analytical tools.