sPDCCH Candidate Assignment via RRC Reconfiguration
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Solution Overview
Problem
Current configurations for the downlink control channel in short Transmission Time Interval (sTTI) operations, specifically the assignment of short Physical Downlink Control Channel (sPDCCH) candidates, lack definition and flexibility, leading to increased blind decodes and processing burdens on wireless devices.
Innovation Solution
A method for assigning sPDCCH candidates at different aggregation levels within a configured search space region, allowing sharing of the same search space among different wireless devices and reducing the number of blind decodes by reconfiguring aggregation levels and candidates via Radio Resource Control (RRC) signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sPDCCH candidates are assigned at multiple aggregation levels without reconfiguration, then comprehensive coverage and reliability are improved, but processing load and blind decode operations increase
Solution Approach 1:
The patent implements dynamic reconfiguration of sPDCCH aggregation levels and candidate assignments through RRC signaling. The network can adaptively adjust the aggregation level configuration based on channel conditions and traffic requirements, allowing wireless devices to switch between different processing complexities. This dynamic adjustment resolves the contradiction by enabling high reliability when needed while reducing processing load during normal operation.
Solution Approach 2:
The patent changes the parameters of sPDCCH transmission by reconfiguring aggregation levels and candidate assignments through RRC signaling. By modifying these parameters dynamically, the system can optimize the balance between detection reliability and processing load. When channel conditions are good, lower aggregation levels reduce processing load while maintaining reliability; when conditions deteriorate, higher aggregation levels ensure reliability despite increased processing requirements.
2Reliability
If sPDCCH candidates are assigned at higher aggregation levels, then detection reliability is improved, but resource consumption increases
Solution Approach 1:
The patent enables dynamic adjustment of aggregation levels through RRC reconfiguration, allowing the system to adapt to changing channel conditions. When channel quality is high, lower aggregation levels are used, conserving radio resources while maintaining detection reliability. When channel quality degrades, the system dynamically switches to higher aggregation levels to ensure reliable detection, accepting the temporary increase in resource consumption only when necessary.
Solution Approach 2:
The patent modifies the aggregation level parameters of sPDCCH candidates based on channel conditions and traffic requirements. By reconfiguring these parameters through RRC signaling, the system optimizes the trade-off between detection reliability and radio resource consumption. This parameter adaptation ensures that high aggregation levels (and their resource cost) are used only when the reliability benefit is justified by poor channel conditions.
3Productivity
If search space region is shared among multiple wireless devices, then resource efficiency is improved, but interference and collision probability increase
Solution Approach 1:
The patent segments the search space configuration by assigning different aggregation levels and candidate sets to different wireless devices through individualized RRC reconfiguration. While devices share the same physical search space region for resource efficiency, the logical segmentation through differentiated aggregation level assignments reduces interference and collision probability. Each device monitors a customized subset of candidates within the shared region, distributing the interference load and reducing collision probability.
4Adaptability or versatility
If aggregation levels are reconfigured via RRC signaling, then flexibility and adaptability are improved, but signaling overhead increases
Solution Approach 1:
The patent implements dynamic reconfiguration of sPDCCH aggregation levels through RRC signaling, providing adaptability to changing channel conditions and traffic requirements. The system balances signaling overhead against configuration flexibility by reconfiguring parameters adaptively rather than statically. RRC signaling is used to convey aggregation level assignments and candidate configurations, enabling the network to optimize sPDCCH transmission parameters based on real-time conditions while managing the overhead through efficient signaling mechanisms.
Data Source
AI summary
A network node, method and wireless device are provided. A network node for configuration of a downlink control channel for a short transmission time interval, sTTI, in a communication network is provided. The network node includes processing circuitry configured to assign a search space region to be monitored by a first wireless device in the communication network where the search space region includes a plurality of downlink control channel candidates associated with a plurality of aggregation levels. Each of the plurality of downlink control channel candidates have at least one corresponding short Control Channel Element, sCCE. The processing circuitry is further configured to transmit, to the first wireless device, a bitmap indicating at least one of the plurality of downlink control channel candidates for at least one aggregation level to monitor.