PDCCH Repetition Across TRPs for Reliable NR Random Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring reliable and efficient random access in New Radio (NR) networks, particularly in scenarios with high interference or varying channel conditions, which can lead to increased latency and reduced throughput.
Innovation Solution
Implementing control channel repetition across multiple transmission/reception points (TRPs) to enhance the reliability and efficiency of random access procedures in NR networks, utilizing techniques such as beam management and adaptive configuration of bandwidth parts (BWPs) to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channel repetition is implemented across multiple TRPs, then reliability of random access is improved, but device complexity and processing overhead increase
Solution Approach 1:
The control channel transmission is segmented across multiple Transmission Reception Points (TRPs), where each TRP transmits a portion of the control channel repetition. This segmentation allows the system to achieve diversity gain and improved reliability without requiring a single complex transmission point, as each TRP can be independently managed and processed.
Solution Approach 2:
The patent implements partial repetition of control channels across TRPs rather than complete redundancy. By transmitting control channel repetitions selectively across multiple TRPs based on channel conditions and configuration parameters, the system achieves sufficient reliability improvement without the full overhead of complete replication at all possible points.
2Reliability
If control channel repetition is implemented across multiple TRPs, then random access reliability is improved, but latency increases
Solution Approach 1:
Control channel repetitions are transmitted periodically across multiple TRPs with configurable time intervals. This periodic transmission allows receiving devices to accumulate sufficient signal quality over time to make reliable decoding decisions, balancing the trade-off between reliability improvement and latency introduction through controlled repetition timing.
3Productivity
If bandwidth parts are adaptively configured for control channel repetition, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic bandwidth part (BWP) configuration for control channel repetitions, where the bandwidth and frequency location of BWPs are adaptively adjusted based on channel conditions, traffic requirements, and interference levels. This dynamic configuration allows the system to optimize spectral efficiency by allocating appropriate bandwidth resources to control channel repetitions while managing device complexity through standardized adaptation procedures.
Solution Approach 2:
The system changes key parameters including bandwidth part size, frequency location, and subcarrier spacing for control channel repetitions based on measured channel conditions and network requirements. By dynamically adjusting these parameters, the system optimizes spectral efficiency for different operating scenarios while maintaining manageable device complexity through parameter-based configuration rather than structural changes.
Data Source
AI summary
A wireless device may receive, via a control resource set (coreset) activated with at least two transmission configuration indicator (TCI) states, a physical downlink control channel (PDCCH) order triggering a random-access procedure for a cell. The wireless device may transmit a random-access preamble, of the random-access procedure, with a transmission power based on a TCI state among the at least two TCI states of the coreset.