Bandwidth Part Hopping Pattern for 5G Reliability
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Solution Overview
Problem
Current 5G wireless communication systems face challenges in achieving high reliability, particularly in ultra-reliable and low-latency communications (URLLC) and massive machine-type communications (mMTC), where stringent requirements for throughput, latency, and availability are not fully met, limiting the support for vertical applications and large numbers of connected devices.
Innovation Solution
The proposal involves utilizing bandwidth part (BWP) hopping patterns for retransmissions and repetitions in both downlink and uplink signals, leveraging frequency diversity to improve reliability by signaling a hopping pattern instead of a single active BWP, which reduces latency and maintains compact DCI overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single active bandwidth part (BWP) is used for signal transmission, then the device complexity is reduced, but the reliability and diversity gains are insufficient
Solution Approach 1:
The system divides the available bandwidth into multiple bandwidth parts (BWPs), each representing a distinct frequency segment. Instead of using the entire bandwidth continuously, the signal is segmented across different BWP segments in successive transmission time intervals, enabling frequency diversity while maintaining manageable device complexity through structured segmentation.
Solution Approach 2:
The system dynamically switches the active bandwidth part across different transmission time intervals according to a hopping pattern. This dynamic reconfiguration allows the signal to exploit frequency diversity by transmitting over different frequency segments at different times, improving reliability without requiring simultaneous management of all BWPs, thus controlling device complexity.
2Reliability
If frequency hopping across multiple bandwidth parts is implemented, then diversity gains and reliability are improved, but the control signaling overhead increases
Solution Approach 1:
The system employs a periodic bandwidth part hopping pattern where the active BWP changes according to a predetermined sequence across transmission time intervals. This periodic structure allows the receiver to anticipate and track the hopping pattern without requiring continuous explicit signaling, thereby maintaining high reliability through frequency diversity while minimizing control overhead.
Solution Approach 2:
The hopping pattern information is copied and reused across multiple transmission time intervals. Instead of signaling the active BWP selection in every TTI, the system establishes a hopping pattern that is replicated and applied periodically, reducing the amount of control information that needs to be transmitted while maintaining the diversity gains of frequency hopping.
3Loss of time
If bandwidth part hopping is used for retransmissions, then latency is reduced through faster retransmission, but the system complexity increases
Solution Approach 1:
The hopping pattern is predetermined and configured in advance for retransmission scenarios. When a retransmission is needed, the system immediately follows the pre-established hopping pattern without requiring complex real-time decision-making, thus reducing retransmission latency while keeping the evaluation complexity manageable through use of pre-computed patterns.
Solution Approach 2:
The system changes the active bandwidth part parameter across different transmission time intervals according to the hopping pattern. For retransmissions, this parameter change follows a predefined sequence that optimizes latency by quickly switching to a different frequency segment, reducing the time needed for retransmission while maintaining acceptable complexity through parameter-based control.
Data Source
AI summary
The disclosure relates to a communication device, a base station and respective integrated circuits and methods for a communication device and a base station. The communication device comprises a transceiver which, in operation, receives, from a base station, a hopping pattern indicator, a hopping pattern being an order of a plurality of bandwidth parts by which a signal is to be received or transmitted in a plurality of transmission time intervals, TTIs, a bandwidth part being formed by at least one physical resource block. The communication device further comprises circuitry which, in operation, determines a hopping pattern to be applied based on the hopping pattern indicator. The transceiver, in operation, further receives or transmits the signal in the plurality of TTIs according to the determined hopping pattern.