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## Random access in satellite communications: a background on legacy and advanced schemes

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This chapter presents a background on the various legacy and advanced RA techniques proposed for satellite communications. First, we describe the main motivations for enhancing RA performance on the return link. Then, we present a list of legacy RA techniques used mostly for login purposes. Furthermore, we provide another list describing the recent RA techniques with enhanced performance due to data replication and additional signal processing at the receiver side. These recent RA schemes can be mutually used for login as well as data transmissions over the return link. Finally, we give a global comparison of the performance of enhanced RA and we discuss the application of each scheme with respect to system constraints such as power limitations, lower data rates and synchronisation overhead reduction.

Chapter Contents:

• 15.1 Introduction
• 15.2 Legacy RA techniques for satellite communications
• 15.2.1 ALOHA
• 15.2.2 Slotted versions ALOHA
• 15.2.2.1 Slotted ALOHA
• 15.2.2.2 Diversity slotted ALOHA
• 15.2.3 Conclusion on legacy RA techniques for the return link
• 15.3 Advanced RA techniques for satellite communications
• 15.3.1 Main metrics for the evaluation of advanced RA schemes via simulations
• 15.3.2 Advanced synchronous RA techniques
• 15.3.2.1 Contention resolution diversity slotted ALOHA
• 15.3.2.2 Irregular repetition slotted ALOHA
• 15.3.2.3 Coded slotted ALOHA
• 15.3.2.4 Multi-slot coded ALOHA
• 15.3.2.5 Multi-replica decoding using correlation based localisation
• 15.3.2.6 Multi-frequency contention resolution diversity slotted ALOHA
• 15.3.2.7 Summary and brief discussion for advanced synchronous RA
• 15.3.3 Advanced asynchronous RA techniques
• 15.3.3.1 Enhanced spread spectrum ALOHA
• 15.3.3.2 Enhanced contention resolution ALOHA
• 15.3.3.3 Asynchronous contention resolution diversity ALOHA
• 15.3.3.4 Summary and brief discussion for advanced asynchronous RA
• 15.4 General comparison metrics for different advanced RA techniques
• 15.4.1 Power limitations at the terminal side
• 15.4.2 Communications at very low data rates
• 15.4.3 High throughput performance at MAC-layer level
• 15.4.5 Comparative table
• 15.5 General summary and final remarks
• References

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