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In the fifth generation and beyond (B5G) technologies, delay constrainsemerge as a topic of particular interest for ultra reliable low latencycommunications (e.g., enhanced reality, haptic communications). In this report,we study the performance of a two user uplink non orthogonal multiple access(NOMA) network under quality of service (QoS) delay constraints, capturedthrough each user delay exponents in their effective capacity (EC). We proposenovel closed form expressions for the EC of the NOMA users and validate themthrough Monte Carlo simulations. Interestingly, our study shows that in thehigh signal to noise ratio (SNR) region, the strong NOMA user has a limited ECno matter how large the transmit SNR is, under the same delay constraint as theweak user. We show that for the weak user OMA achieves higher EC than NOMA atsmall values of the transmit SNR and that NOMA become more beneficial at highvalues of the transmit SNR. For the strong user, we show that NOMA achieves ahigher EC than OMA at small values of the transmit SNR and that at high valuesof the transmit SNR OMA becomes more beneficial. By introducing user pairingwhen more than two NOMA users are present, we show that NOMA with user pairingoutperforms OMA in term of the total link layer EC. Finally, we find the set ofpairs which gives the highest total link-layer in the uplink for NOMA withmultiple user-pairs.

Asymptotic regime analysis of NOMA uplink networks under QoS delay Constraints