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Joint Power, Compression Rate, and Bandwidth Optimization for an IAB- and O-RAN-Enabled NTN Architecture
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- Authors
- Junseok Lee, Hee Wook Kim, Joon-Gyu Ryu, Yousaf Bin Zikria, Jingon Joung, Heejung Yu
- Citation
- IEEE Internet of Things Journal, Early Access
- ISSN
- 2327-4662
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- Ubiquitous connectivity is the most significant goal of sixth-generation (6G) wireless networks. To this end, integrating non-terrestrial networks (NTNs) with terrestrial networks (TN) can be an inevitable path to 6G. To achieve cost-effectiveness and bandwidth efficiency in NTN design, the open radio access network (O-RAN) and integrated access and backhaul (IAB) approaches, which prevail in TN, are adopted in the proposed NTN architecture. To maximize the uplink rate under bandwidth and power constraints, we jointly optimize i) the power allocation to pilot and data symbols, ii) the compression rates for inter-satellite link (ISL) transmission of pilot and data, and iii) the bandwidth partitioning between the access link and the xHaul link. Because the original optimization problem is challenging to solve directly, it is decomposed into three subproblems: power, compression rate, and bandwidth optimization, while the other parameters being kept fixed. The convergent solution is obtained via an iterative optimization approach that alternates between optimization and a gradient-based search. The effectiveness of the proposed approach is verified by numerical simulations.
- Keyword
- compression, IAB, ISL, NTN, O-RAN, open NTN, optimization
- KSP Keywords
- Bandwidth optimization, Compression rate, Cost-effectiveness, Gradient-based search, Inter-satellite Links(ISLs), Joint power, Optimization approach, Power Constraint, Radio Access Network(RAN), Ubiquitous connectivity, bandwidth efficiency