DL Control Signaling With Adaptive DCI Bit Fields
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Solution Overview
Problem
Existing 4G communication systems face challenges in efficiently managing DL control signaling overhead and reliability, particularly in supporting higher data rates and dynamic channel conditions, which are exacerbated in pre-5G or 5G networks.
Innovation Solution
The solution involves optimizing DL control signaling by allowing UEs to determine the number of repetitions for PDCCH reception, reducing non-overlapping CCEs for channel estimation, and dynamically scheduling PDSCH receptions without associated DCI formats, while enabling broadcast transmissions and HARQ-ACK feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DCI format includes a field with a predetermined number of bits indicating a parameter, then the parameter can be reliably indicated, but the overhead of the DCI format increases
Solution Approach 1:
The patent applies dynamics by making the DCI format adaptable through a configuration parameter that dynamically adjusts the number of bits allocated to the parameter field. Instead of using a fixed predetermined number of bits, the system can configure the field size based on actual needs, allowing the DCI format to optimize between reliability and overhead dynamically.
Solution Approach 2:
The patent implements parameter changes by allowing the number of bits in the DCI format field to be configured rather than fixed. This enables the system to change the bit allocation parameter according to service requirements, channel conditions, and overhead constraints, resolving the contradiction between reliable parameter indication and minimizing DCI overhead.
2Measurement precision
If a UE performs channel estimation on multiple non-overlapping CCEs to decode DCI format, then decoding accuracy improves, but processing complexity and time increase
Solution Approach 1:
The patent applies partial action by allowing the UE to perform channel estimation on a configured number of non-overlapping CCEs rather than requiring estimation on all possible CCEs. The network can configure the UE to monitor only specific CCE positions, reducing the number of channel estimation operations while maintaining sufficient decoding accuracy for the scheduled transmissions.
3Reliability
If the system supports dynamic number of repetitions for PDCCH reception, then reliability in poor channel conditions improves, but latency and resource consumption increase
Solution Approach 1:
The patent applies dynamics by enabling the number of PDCCH repetitions to be configured based on channel conditions and service requirements. The system can dynamically adjust the repetition count - using more repetitions for reliable parameter indication in poor conditions while minimizing repetitions when channel conditions are good, thus balancing reliability improvements against latency and resource consumption.
Data Source
AI summary
Methods, user equipment (UE), and base stations for downlink control information (DCI) formats reception or transmission are provided. A method of operating a UE to transmit a physical uplink shared channel (PUSCH) includes receiving a configuration for a number of bits for a field that indicates a parameter in a first downlink control information (DCI) format; and receiving a physical downlink control channel (PDCCH) that provides either the first DCI format scheduling the PUSCH or a second DCI format scheduling the PUSCH. The second DCI format includes a field with a predetermined number of bits that indicates the parameter. A minimum number of bits for the field in the first DCI format is smaller than the predetermined number of bits for the field in the second DCI format. The method also includes transmitting the PUSCH.