  Satellite communication constitutes a promising solution for the sixth
generation (6G) wireless networks in terms of providing global communication
services. In order to provide a cost-effective satellite network, we propose a
novel medium-earth-orbit (MEO) satellite aided
integrated-navigation-and-communication (INAC) network. To overcome the severe
path loss of MEO satellites, we conceive a network for simultaneous serving
navigation and communication for ground users by adopting the non-orthogonal
multiple access (NOMA) technique and the reconfigurable intelligent surface
technique. Based on the power allocation strategies, communication-oriented
(CO-) and navigation-oriented (NO-) INAC scenarios are proposed. We first
derive the closed-form expressions for the new channel statistics, outage
probability and channel capacity of the INAC-user. For gleaning further
insights, the diversity orders and navigation accuracy are evaluated for
illustrating the performance of the INAC networks. According to our analysis,
when RIS elements are sufficient, the proposed INAC network can perform better
than conventional terrestrial communication networks in terms of channel
capacity. Numerical results are provided for confirming that the NO-INAC and
CO-INAC scenarios have superior performance for communication in the low
signal-to-noise-ratio (SNR) regimes and high SNR regimes, respectively, which
indicates a hybrid CO/NO-INAC network is preferable.
