PDCCH Decoding Configuration for UE Power Savings
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Solution Overview
Problem
Existing communication systems face challenges in efficiently managing the transmission of physical downlink control channels (PDCCHs) in 5G communication systems, including power savings for user equipment (UEs), multi-slot scheduling, and optimizing spectral efficiency.
Innovation Solution
The proposed solution involves a gNB (base station) informing UEs of the number of slot symbols for downlink and uplink signaling, enabling multi-slot scheduling for PDSCH (physical downlink shared channel) and PUSCH (physical uplink shared channel) transmissions, reducing the number of PDCCH decoding operations, and allowing UEs to receive PDSCH transmissions over a different bandwidth than PDCCH transmissions without impacting spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE performs maximum number of decoding operations for PDCCHs in every slot during non-DRX state, then reliability of control channel reception is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic adaptation of PDCCH monitoring behavior based on DRX state. During non-DRX state, the UE dynamically adjusts the number of decoding operations based on gNB configuration and traffic conditions rather than always performing maximum decoding, enabling flexible trade-off between reliability and power consumption
Solution Approach 2:
The patent changes the parameter of PDCCH decoding quantity from fixed maximum to configurable values. The gNB can configure the UE to perform a specific number of decoding operations (less than maximum) based on channel conditions, traffic type, and power saving requirements, allowing optimization of the reliability-power tradeoff
2Reliability
If a gNB allocates fixed time/frequency resources for PDCCH transmissions, then reliability of control channel delivery is improved, but spectral efficiency decreases
Solution Approach 1:
The patent implements dynamic resource allocation for PDCCH transmissions. The gNB can vary the actual number of time/frequency resources used for PDCCH in each slot based on traffic conditions, allowing the system to adapt between reliability-oriented allocation (more resources) and efficiency-oriented allocation (fewer resources)
Solution Approach 2:
The patent segments the time/frequency resources for PDCCH into configurable portions. Instead of allocating fixed resources, the gNB can configure maximum resources and dynamically allocate actual resources based on need, with remaining resources available for data transmissions
3Adaptability or versatility
If a UE receives PDSCH transmissions over a different bandwidth than PDCCH transmissions, then adaptability to different service requirements is improved, but system complexity increases
Solution Approach 1:
The patent segments the system bandwidth into different portions for control and data transmissions. The UE can be configured with a first bandwidth for PDCCH reception and a second (different) bandwidth for PDSCH reception, allowing independent optimization of control and data channels for different service requirements
Data Source
AI summary
A method of a user equipment (UE) for controlling a signal comprises receiving configuration information for enabling or disabling a signal transmission, receiving a first physical downlink control channel (PDCCH) conveying a first downlink control information (DCI) format, decoding the first DCI format, determining whether the first DCI format is correctly decoded; and transmitting the signal or suspending a transmission of the signal according to the configuration information when the first DCI format is not correctly decoded.