Downlink Control Channel Reliability via Multi-TRP Beam Diversity
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Solution Overview
Problem
Wireless communication systems face challenges in ensuring the reliability and accuracy of downlink control channel transmissions, particularly due to increasing device functionality and power strain on user equipment devices, which affects battery life and communication efficiency.
Innovation Solution
A cellular base station configures downlink control channel transmissions by providing configuration information that utilizes multiple transmission reception points (TRPs) for joint encoding and repetition of downlink control information, leveraging beam diversity to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink control information is transmitted using multiple transmission reception points with joint encoding and repetition, then reliability of downlink control information communications is improved, but device complexity increases
Solution Approach 1:
The downlink control information transmission is segmented across multiple transmission reception points (TRPs), where each TRP transmits a portion of the control information independently. This segmentation allows the system to achieve improved reliability through diversity without requiring complex joint processing at the UE, as each TRP operates semi-independently with its own encoding instance.
Solution Approach 2:
The patent applies partial action by transmitting redundant copies of downlink control information across multiple TRPs rather than attempting to optimize a single transmission. This excessive action (sending more copies than strictly necessary for basic communication) ensures that at least one copy is received correctly, improving reliability while keeping the UE complexity manageable through straightforward repetition decoding.
2Productivity
If multiple transmission reception points are used for downlink control information transmission, then communication efficiency is maintained, but power consumption in user equipment devices increases
Solution Approach 1:
The patent uses copying by transmitting identical or redundant copies of downlink control information from multiple TRPs. The UE simply needs to decode one successful copy rather than process multiple different transmissions, which maintains communication efficiency while minimizing power consumption through simplified reception and decoding operations.
3Reliability
If beam diversity is leveraged across multiple transmission reception points, then reliability of downlink control information is improved, but system complexity increases
Solution Approach 1:
Each transmission reception point uses local beamforming quality optimized for its specific transmission direction and channel conditions. The UE benefits from beam diversity across different TRPs without needing to manage the complexity of beam formation itself, as each TRP independently applies local beam optimization suited to its spatial location and antenna configuration.
Data Source
AI summary
This disclosure relates to techniques for configuring and providing physical downlink control channel transmissions with improved reliability in a wireless communication system. A cellular base station may establish a wireless link with a wireless device. The cellular base station may provide downlink control channel configuration information to the wireless device. The downlink control channel configuration information may configure control resources associated with multiple transmission reception points in a search space for the wireless device. The cellular base station may provide downlink control information to the wireless device using control resources included in the search space.