Antenna State Switching for 5G URLLC Reliability
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Solution Overview
Problem
5G URLLC systems face challenges in achieving high reliability and low latency due to limitations in power consumption, silicon area, processing capability, and system budget, which restrict the number of RF chains in User Equipment (UE) devices, hindering the full utilization of high MIMO orders for improved reliability and throughput.
Innovation Solution
The implementation of a wireless apparatus that switches between multiple antenna states to receive and transmit proactive repetitions, allowing UE devices to select and switch between k antenna states for each downlink transmission, using CSI reports to adjust configurations and improve link reliability without requiring a high number of RF chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high MIMO order is used to improve reliability and throughput, then packet loss performance improves, but device complexity and power consumption increase due to requiring more RF chains
Solution Approach 1:
The patent implements dynamic switching between different antenna states (e.g., horizontal and vertical polarizations) at the receiver. The receiver can adaptively change its antenna configuration based on channel conditions, allowing it to achieve diversity gain without requiring multiple simultaneous RF chains. This dynamic adaptation enables high MIMO order performance with limited hardware resources.
Solution Approach 2:
The patent changes the antenna state parameter (polarization orientation) over time to receive proactive repetitions. By switching between different antenna states for different repetitions, the system exploits polarization diversity to improve reliability without increasing the number of RF chains. The antenna state parameter is modified dynamically across multiple receptions of the same data.
2Productivity
If more RF chains are added to support high MIMO order, then system throughput improves, but power consumption increases
Solution Approach 1:
The receiver dynamically switches between different antenna states to process multiple proactive repetitions. This dynamic switching allows the system to achieve high throughput through diversity combining without requiring multiple permanent RF chains, thereby reducing overall power consumption while maintaining productivity.
Solution Approach 2:
The system uses the same physical RF chain to receive multiple copies (proactive repetitions) of the same data by switching antenna states between receptions. Instead of requiring separate RF chains for each reception path, the same hardware resource is reused across time with different antenna configurations, reducing power consumption while maintaining throughput.
3Reliability
If proactive repetitions are transmitted to improve reliability, then packet loss performance improves, but latency increases
Solution Approach 1:
The system transmits multiple proactive repetitions in advance before the receiver needs the data. By pre-transmitting redundant copies with different antenna states, the receiver can quickly decode the data from the first successful reception without waiting for retransmissions, thereby reducing latency while maintaining high reliability.
Solution Approach 2:
The receiver periodically switches between different antenna states to receive proactive repetitions at regular intervals. This periodic switching allows the system to efficiently process multiple repetitions without continuous resource allocation, balancing reliability improvement with latency constraints by receiving updates at optimized time points.
Data Source
AI summary
In one embodiment, a method includes identifying a number of configured proactive repetitions in downlink transmissions from the base station, selecting k antenna states for receiving repetitive downlink transmissions among the number of antenna states, where k equals the number of configured proactive repetitions, and where each of the k antenna states corresponds to each of the repetitive downlink transmissions, transmitting a CSI report for each of the k antenna states to the base station, where a CSI report for an antenna state is used by the base station to adjust configurations for the corresponding downlink transmission, receiving signals for each of the k repetitive downlink transmissions from the base station using each of the k antenna states, and decoding the downlink transmission based on k sets of received signals, each of the k sets being received using each of the k selected antenna states.