EPDCCH Common Search Space Design for Carrier Types
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Solution Overview
Problem
Current communication systems, such as LTE/LTE-Advanced, face inadequate downlink control channel signaling, particularly in the enhanced physical downlink control channel (EPDCCH), which affects the monitoring of control information for paging and random access in user equipment (UE).
Innovation Solution
A wireless transmit/receive unit (WTRU) and method for transmitting control information in an enhanced physical downlink control channel (E-PDCCH) that allows monitoring based on control information from another E-PDCCH, utilizing a common search space (CSS) configuration to improve channel estimation and interference coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If downlink control channel signaling is provided in enhanced physical downlink control channel (E-PDCCH), then control information transmission capacity is improved, but monitoring of control information for paging and random access becomes inadequate
Solution Approach 1:
The patent divides the E-PDCCH resources into separate common search spaces for different carrier types. One CSS is configured for legacy carrier types with adequate monitoring capability, while another CSS is configured for new carrier types. This segmentation allows each carrier type to have optimized monitoring parameters, resolving the contradiction between improved transmission capacity and maintained monitoring reliability.
2Productivity
If multiple carrier types are provided in communication system, then system throughput and cell coverage are enhanced, but control channel signaling becomes inadequate
Solution Approach 1:
The patent applies different monitoring configurations and parameters to different carrier types locally. Each carrier type can have its own common search space with parameters optimized for its specific requirements. This local quality approach allows the system to maintain high throughput across multiple carrier types while ensuring each type has adequate control channel signaling reliability tailored to its characteristics.
Data Source
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AI summary
Embodiments contemplate enhanced physical downlink control channel (EPDCCH). A user equipment (UE) or a wireless transmit/receive unit (WTRU) may receive a first type (e.g., type I) EPDCCH common search space (CSS) subframe for example is a subset of subframes. The UE or WTRU may monitor first type downlink control information (DCI), for example perhaps within the first type EPDCCH CSS subframe, among other scenarios. A broadcast channel (e.g. MIB) may be received in the first type EPDCCH CSS. The UE or the WTRU may receive configuration information for a second type (e.g., type 2) EPDCCH CSS, for example from the first type EPDCCH CSS. A system information block (SIB) may be received in the second type EPDCCH CSS. The UE or the WTRU may monitor a second type DCI, for example perhaps in the second type EPDCCH CSS.