UCI intra-UE multiplexing

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Table of contents

Abstract
Acknowledgements
Abbreviations
1 Introduction
1.1 5G New Radio overview
1.2 URLLC requirements
1.3 Physical layer design for URLLC in 3GPP Releases 15, 16, and
1.3.1 3GPP Release 15 – the foundation for URLLC in 5G
1.3.2 3GPP Release 16 features for URLLC in 5G
1.3.3 3GPP Release 17 features for URLLC in 5G
1.4 Thesis outline and contributions
1.5 Thesis perspective from practical (3GPP works) and more fundamental aspects
2 Ensuring Latency and Reliability of the UL Congured Grant transmissions
2.1 Problem formulation
2.2 Related works
2.3 Optimal reserved resources to ensure K repetitions
2.3.1 Reserved resources
2.3.2 System model
2.3.3 Collision probability in reserved resources
2.3.4 Group access to the reserved resources
2.3.5 Optimal reserved resources with a successive interference cancellation (SIC) receiver at the gNB
2.4 Explicit HARQ feedback structure to reduce packet loss in the less-than-K-repetition situation
2.4.1 Operation of the explicit HARQ feedback structure
2.4.2 Design of the explicit HARQ feedback
2.5 Additional SR to reduce packet loss in the less-than-K-repetition situation
2.6 Numerical results and performance evaluation
2.6.1 Optimal reserved resources
2.6.2 Explicit feedback structure and additional SR in less-than-K-repetition transmission
2.7 Conclusion
3 UL eMBB and URLLC multiplexing
3.1 Problem of multiplexing URLLC and eMBB in the CG resources
3.2 Related works
3.3 Strategy to multiplex the eMBB and URLLC UEs in the CG resources
3.3.1 The overlap indication and the explicit HARQ ACK feedback
3.3.2 The overlap indication and the additional SR
3.3.3 Conguration and Signalling for the Overlap Indication
3.3.4 Design of the Explicit HARQ Feedback
3.4 Numerical results and performance evaluation
3.5 Conclusion
4 Feedback Enhancements for Downlink Semi-Persistent Scheduling Transmissions in Ultra- Reliable Low-Latency Communication
4.1 Feedback cancellation in DL SPS transmission in TDD conguration
4.2 Related works
4.3 Enhancements for HARQ feedback in DL SPS transmission in TDD
4.3.1 Dynamically indication of K1 value for each DL SPS transmission
4.3.2 ACK-only feedback structure
4.4 Numerical results
4.5 Conclusion
5 Load based channel access enhancements in unlicensed spectrum for NR URLLC trans- missions
5.1 Load based channel access mechanism
5.2 Related works
5.3 Analysis of Type 1 channel access procedures in unlicensed spectrum
5.3.1 System model
5.3.2 Probabilities of the states in Markov chain for Type 1 channel access procedures
5.3.3 Transmitter’s average channel access time in Type 1 channel access procedures
5.3.4 DL and UL transmissions’ latency in unlicensed spectrum
5.4 Conditions and enhancements in using Type 1 channel access procedures
5.4.1 Numerical results of the impact of channel access on URLLC transmission .
5.4.2 New proposed tables of channel access priority class for URLLC DL and UL transmission
5.5 Conclusion
6 Frame based channel access enhancements in unlicensed spectrum for NR URLLC trans- missions
6.1 Frame based channel access mechanism
6.2 Related works
6.3 Analysis of FBE in unlicensed spectrum
6.3.1 System model
6.3.2 Probabilities of the states and channel access in Markov chain for FBE channel access
6.3.3 Relation between the probability of no data and the probability of sensing a busy channel
6.3.4 URLLC operation with FBE in unlicensed spectrum
6.4 Multiple congurations of FFP in FBE for URLLC in unlicensed spectrum
6.4.1 Multiple congurations of FFP
6.4.2 The Markov chain of FBE channel access with multiple congurations of FFP
6.5 FFP arrangement based on the transmitter’s priority
6.6 Numerical and simulation results
6.7 Conclusion
7 Dynamic switching between load based and frame based channel access mechanisms in unlicensed spectrum
7.1 Markov chain model for the coexistence of the devices using LBE and FBE in unlicensed spectrum
7.1.1 System model
7.1.2 LBE’s model
7.1.3 FBE’s model
7.1.4 Coexistence of LBE and FBE’s model
7.2 Dynamic switch between LBE and FBE at the UE in unlicensed spectrum
7.2.1 Switch from FBE to LBE
7.2.2 Switch from LBE to FBE
7.3 Numerical results
7.4 Conclusion
8 Enhancements of PUSCH repetitions for URLLC in unlicensed spectrum
8.1 Gap in the middle of PUSCH repetitions
8.1.1 Gap due to UL/DL directions
8.1.2 Gap due to orphan symbols
8.2 Related works
8.3 Enhancements of PUSCH repetitions in licensed and unlicensed spectrum
8.3.1 Handling gap due to UL/DL directions
8.3.2 Handling orphan symbols
8.4 Simulation results
8.4.1 Performance of the scheme to handle UL/DL directions
8.4.2 Performance of the scheme to handle orphan symbols
8.5 Conclusion
9 Conclusions
9.1 Concluding remarks
9.2 Future perspectives
References