Small cells is a promising technique to improve the spectral efficiency or quality-of-service (QoS) of a cellular network as it reduces the distance between the user and the base station (MBS). It has been proposed for indoor as well as outdoor users. For the outdoor scenario, the backhaul (the link from a small cell to the core network) of the small cell has always been a challenging issue. Different schemes have been proposed in the literature such as optical fiber, satellite and wirelessly through MBS. Wireless backhaul through MBS has gained a lot of attention in the literature and different resource allocation with orthogonal resources strategies have been proposed for it as well. Apart from orthogonal techniques, non-orthogonal multiple access (NOMA) is a multi access technique with the basic principle of sharing the same bandwidth resource between multiple users with varying power levels. Successive interference cancellation (SIC) is implemented on the receiver side to decode the data. This overall increases the spectrally efficiency of the network and make NOMA a promising candidate to be deployed on the backhaul of the small cell network. In this paper, we investigate the problem of pairing of small cells and the allocation of resources. Small cells' load information plays vital role to solve this problem. An optimization problem with an objective of maximizing the spectral efficiency (SE) of the backhaul network is formulated. The joint problem is decomposed and solved using a load-based heuristic for the backhaul of small cells. Furthermore, our performance evaluation shows that the proposed heuristic is able to achieve nearly-same spectral efficiency as that of exhaustive search with much less complexity.

小型蜂窝小区是一种改善蜂窝网络频谱效率或服务质量（QoS）的有前途的技术，因为它减少了用户与基站（MBS）之间的距离。已经针对室内和室外用户提出了该方案。对于室外场景，小型小区的回程（从小型小区到核心网络的链接）一直是一个具有挑战性的问题。文献中已经提出了不同的方案，例如光纤，卫星以及通过MBS的无线方案。通过MBS进行的无线回传已在文献中引起了广泛关注，并且还为此提出了采用正交资源策略的不同资源分配方法。除了正交技术，非正交多路访问（NOMA）是一种多路访问技术，其基本原理是在功率水平不同的多个用户之间共享相同的带宽资源。在接收机侧实现了连续干扰消除（SIC）来解码数据。这总体上提高了网络的频谱效率，并使NOMA成为可部署在小型蜂窝网络回程上的有希望的候选者。在本文中，我们研究了小型小区的配对和资源分配的问题。小型小区的负载信息对于解决这个问题起着至关重要的作用。提出了以最大化回程网络的频谱效率（SE）为目标的优化问题。使用基于负载的启发式方法分解和解决了小型蜂窝回传的联合问题。此外，