A key aspect of radio spectrum sharing and compatibility studies is the modelling of interference levels seen by the receivers of one service from the transmitters of another service. In general, calculated interference levels must be below predetermined interference thresholds for sharing or compatibility to be considered feasible. Sometimes, the modelling must take account of interference sourced from services operating in the spectrum but not directly under investigation in the study. This may be done by apportioning the interference thresholds for a particular service between other radio services using, or with potential to use, the spectrum; a method termed service apportionment. Traditionally, equal apportionments for those services with the same regulatory status has been assumed. This is very simple but not necessarily spectrally efficient and may overestimate or underestimate the contribution to aggregate interference. This paper sets out an alternative approach. The apportionment assigned to the emerging IMT service is based on an analysis of the established radio interference environment. Specifically: the aggregate interference sourced from a deployment of fixed service (FS) links incident to a satellite receiver. Our analysis shows that the FS links under-utilise the conventional equal apportionment allowing for an inequality between the service apportionments assigned to IMT and FS and greater potential for a solution to this particular compatibility problem.

无线电频谱共享和兼容性研究的一个关键方面是对一个服务的接收者从另一服务的发射器看到的干扰水平进行建模。通常，计算出的干扰水平必须低于预定的干扰阈值才能被认为是可行的共享或兼容性。有时，建模必须考虑到来自频谱中运行的服务的干扰，但并未直接在研究中进行调查。这可以通过在使用频谱或可能使用频谱的其他无线电服务之间分配特定服务的干扰阈值来完成；一种称为服务分配的方法。传统上，假定对具有相同监管状态的服务进行平均分配。这非常简单，但不一定在频谱上有效，并且可能高估或低估了对聚集干扰的影响。本文提出了一种替代方法。分配给新兴IMT服务的分配基于对已建立的无线电干扰环境的分析。具体来说：源自固定业务（FS）链路部署的突发干扰，这些干扰入射到卫星接收器。我们的分析表明，FS链路未充分利用常规的平均分配，从而导致分配给IMT和FS的服务分配之间存在不平等，并且有更大的潜力解决这一特殊的兼容性问题。分配给新兴IMT服务的分配基于对已建立的无线电干扰环境的分析。具体来说：源自固定业务（FS）链路部署的突发干扰，这些干扰入射到卫星接收器。我们的分析表明，FS链路未充分利用常规的平均分配，从而导致分配给IMT和FS的服务分配之间存在不平等，并且有更大的潜力解决这一特殊的兼容性问题。分配给新兴IMT服务的分配基于对已建立的无线电干扰环境的分析。具体来说：源自固定业务（FS）链路部署的突发干扰，这些干扰入射到卫星接收器。我们的分析表明，FS链路未充分利用常规的平均分配，从而导致分配给IMT和FS的服务分配之间存在不平等，并且有更大的潜力解决这一特殊的兼容性问题。