Physical Downlink Control Channel Resource Mapping Fragmentation
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Solution Overview
Problem
The existing LTE system's physical downlink control channel (PDCCH) experiences high fragmentation and low resource utilization due to the interleaved mapping of control resource sets, which affects channel estimation and resource allocation efficiency.
Innovation Solution
The method involves mapping the CCE to a REG bundle set within the control resource set, allowing the CCE to occupy only REG resources within the REG bundle set, thereby reducing fragmentation and improving resource utilization by configuring REG clusters into discrete REG bundle sets and using interleaved or non-interleaved mapping methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interleaved mapping is used to map CCE to REG groups across the entire control resource set, then frequency diversity gain is obtained, but the degree of fragmentation increases and resource utilization rate decreases
Solution Approach 1:
The control resource set is segmented into multiple REG bundle sets, where each REG bundle set contains multiple REG bundles. This segmentation allows CCEs to be mapped to localized REG bundle sets rather than being dispersed across the entire control resource set, thereby reducing fragmentation while maintaining diversity through the selection of multiple REG bundle sets.
Solution Approach 2:
The patent introduces localized mapping within REG bundle sets, where each CCE is mapped to a specific REG bundle set rather than being uniformly distributed across all REG groups. This local quality approach allows for concentrated resource allocation that improves utilization while the selection of multiple REG bundle sets maintains frequency diversity.
2Reliability
If interleaved mapping distributes CCEs uniformly across all REG groups, then frequency diversity is achieved, but fragmentation rate increases
Solution Approach 1:
The control resource set is divided into multiple REG bundle sets, each containing multiple REG bundles. This segmentation creates localized mapping regions that reduce fragmentation by confining CCE mappings to specific REG bundle sets, while the selection of multiple REG bundle sets maintains frequency diversity.
Solution Approach 2:
The patent introduces a new dimension of organization by grouping REGs into REG bundles and further organizing bundles into REG bundle sets. This hierarchical structure adds a layer of localization that reduces fragmentation while maintaining the ability to achieve frequency diversity through cross-set selection.
3Area of stationary object
If CCE is mapped to the entire physical downlink control channel, then coverage is maximized, but resource utilization rate decreases
Solution Approach 1:
The control resource set is segmented into multiple REG bundle sets, allowing CCEs to be mapped to specific segments rather than the entire channel. This segmentation improves resource utilization by concentrating mappings while the multi-set selection maintains adequate coverage.
Solution Approach 2:
The patent changes the mapping parameters by introducing REG bundle sets as an intermediate structure between REG groups and CCEs. This parameter change allows for more efficient resource allocation with improved utilization rate while maintaining necessary coverage through configurable bundle set selection.
Data Source
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AI summary
This application provides an information sending method and a device. The method includes: determining, by a network device, a physical downlink control channel, where the physical downlink control channel includes at least one control channel element CCE, the at least one CCE is mapped to a REG bundle set, the REG bundle set includes N REG clusters that are discrete in frequency domain, each REG cluster includes a plurality of consecutive physical resource blocks in frequency domain, N is less than M, M is a quantity of REG clusters included in a control resource set, and both N and M are positive integers; and sending, by the network device, downlink control information by using the physical downlink control channel. By using the method and device in this application, the degree of fragmentation of the control resource set may be reduced, and the resource utilization rate may be improved.