PDCCH Channel Estimation via UE Capability Reporting
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently channel-estimating a maximum number of control channel elements (CCEs) within a PDCCH monitoring span, which affects resource utilization and latency in supporting high-data-rate services and numerous connected devices.
Innovation Solution
A method where user equipment (UE) transmits capability information to a base station for channel estimation, including the maximum number of non-overlapped CCEs, determined by factors like service type, quality of service, processing time, and transport block size, to configure the timing gap between PDCCH and physical downlink shared channel, enabling more accurate channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports capability information for channel estimation including maximum number of CCEs, then channel estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The capability information is segmented into specific parameters including maximum number of CCEs per monitoring span, processing capability per span, and timing gap requirements. This segmentation allows the base station to selectively configure monitoring spans based on UE capabilities without requiring the UE to report all possible parameters, thus improving accuracy while managing complexity.
Solution Approach 2:
The patent changes the parameter representation by introducing capability information that explicitly defines the maximum number of CCEs per monitoring span and processing capabilities. This parameter transformation enables the system to adapt monitoring configurations to match actual UE processing capabilities, improving channel estimation accuracy without uniformly increasing device complexity across all UEs.
2Reliability
If the maximum number of CCEs is determined based on service type, QoS, and processing time, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The maximum number of CCEs per monitoring span is determined dynamically based on service type, QoS requirements, and processing time constraints. The base station adjusts the monitoring span configuration adaptively according to the specific service requirements, allowing the system to maintain high reliability for critical services while reducing complexity for less demanding services.
Solution Approach 2:
The patent introduces capability information parameters that explicitly capture processing time requirements and service-specific constraints. These parameter changes enable the system to differentiate between various service types and configure appropriate monitoring spans, improving communication reliability for time-critical services without uniformly increasing complexity across all service types.
3Loss of time
If the timing gap between PDCCH and PDSCH is configured based on UE capability information, then latency is reduced, but device complexity increases
Solution Approach 1:
The UE reports capability information including processing time requirements and maximum CCEs per monitoring span before actual data transmission. This preliminary action allows the base station to pre-configure optimal timing gaps between PDCCH and PDSCH based on the UE's reported capabilities, reducing latency without requiring real-time adjustments that would increase operational complexity.
4Productivity
If the UE reports capability information for channel estimation, then resource utilization is improved, but device complexity increases
Solution Approach 1:
The UE autonomously determines and reports its own capability information regarding channel estimation capabilities, including maximum CCEs per monitoring span and processing capabilities. This self-service approach eliminates the need for the network to configure these parameters, improving resource utilization by matching configurations to actual capabilities while minimizing the complexity burden on the network side.
Data Source
AI summary
Proposed is a method for performing the channel estimation of a physical downlink control channel (PDCCH) in a wireless communication system. Specifically, The method performed by a user equipment (UE) includes transmitting, to a base station, UE capability information related to the channel estimation, receiving, from the base station, information for a PDCCH monitoring span, and performing a channel estimation based on the information for the PDCCH monitoring span, wherein the UE capability information may include information for a maximum number of control channel elements (CCEs) capable of being channel-estimated per PDCCH monitoring span.