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Decoupled uplink and downlink access in heterogeneous networks

Decoupled uplink and downlink access in heterogeneous networks

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This chapter describes in detail the DUDe technique. First, Section 9.2 goes through the main challenges HetNets must face in terms of radio planning and interference management, and reviews the potential solutions to address these problems. Thereupon, decoupling UL and DL is recognised as a new technique that can effectively improve the HetNet performance, as shown in Section 9.4, and also can impact positively the performance of other radio access technologies, such as Carrier Aggregation (CA), Coordinated Multipoint transmission and reception (CoMP) or millimetre wave (Section 9.5). The enabling radio access network architectures are discussed in Section 9.6 and higher layer opportunities and challenges are addressed in Section 9.7.

Chapter Contents:

  • 9.1 Introduction
  • 9.2 HetNets challenges in 4G networks
  • 9.2.1 Radio planning challenges in HetNets
  • 9.2.2 Strategies for improvements in HetNets
  • 9.2.3 Decoupling as a solution
  • 9.3 Simulation setup
  • 9.4 Performance evaluation
  • 9.4.1 Coverage and capacity
  • 9.4.2 Reliability and load balancing
  • 9.4.3 Interference behaviour
  • 9.5 Interoperability of DUDe with 4G and 5G features
  • 9.5.1 Inter-band carrier aggregation
  • 9.5.2 Cooperative multi-point
  • 9.5.3 Millimetre wave
  • 9.5.4 Different duplexing techniques
  • 9.6 Enabling radio access network architectures for decoupling
  • 9.6.1 Network procedures
  • 9.6.2 DUDe with assisting connections
  • 9.6.3 User plane bearer split for DUDe
  • 9.6.4 Centralized solution
  • 9.6.5 On the road to 5G-based architectures
  • 9.7 DL/UL challenges and opportunities for higher layers
  • 9.7.1 Effect of UL on the performance of higher layers
  • 9.7.1.1 Modifications to the TCP congestion control
  • 9.7.1.2 TCP congestion control and DL/UL resource allocation
  • 9.7.1.3 Formulation of the OFDMA resource allocation - (P1)
  • 9.7.1.4 Formulation of OFDMA resource allocation - (P2)
  • 9.7.1.5 Finding Solutions for (P1) and (P2)
  • 9.7.1.6 Reducing the UL effect on TCP performance
  • 9.7.2 DL and UL, joint and decoupled
  • 9.7.2.1 Enabling DUDe through multiple TCP flows
  • 9.8 Conclusions
  • References

Inspec keywords: radiofrequency interference; mobile radio; radio access networks; telecommunication network planning

Other keywords: mobile communications; CoMP; carrier aggregation; decoupled uplink-downlink access; interference management; radio planning; HetNet performance; radio access network architectures; coordinated multipoint transmission and reception; heterogeneous networks; millimetre wave; DUDe technique; radio access technologies

Subjects: Communication network design, planning and routing; Mobile radio systems; Radio access systems; Electromagnetic compatibility and interference

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