DM-RS Antenna Port Allocation for Downlink Control Channels
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently allocating reference signal antenna ports for transmit diversity techniques, which affects the performance and competitiveness of wireless communication systems in terms of cost reduction, service availability, flexible frequency band use, and power consumption.
Innovation Solution
A method and apparatus for allocating two antenna ports for DM-RSs in resource element subsets for downlink control channel transmission, where the antenna port indexes are determined based on the number of available resource elements and cyclic prefix length, allowing efficient application of transmit diversity techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna ports are allocated for DM-RS in resource element subsets, then transmit diversity technique performance is improved, but system complexity increases
Solution Approach 1:
The patent divides the resource elements into multiple subsets and allocates different antenna ports to different subsets. This segmentation approach enables transmit diversity by distributing reference signals across multiple antenna ports while maintaining manageable system complexity through structured resource organization.
Solution Approach 2:
The patent dynamically selects antenna port allocation based on the number of available resource elements and cyclic prefix length. This dynamic adaptation allows the system to optimize transmit diversity performance while adjusting to varying system conditions and resource availability, preventing unnecessary complexity in fixed configurations.
2Reliability
If two antenna ports are allocated to resource elements in turn, then downlink control channel performance is improved, but resource overhead increases
Solution Approach 1:
The patent applies different antenna port allocations to different resource element subsets based on local requirements. By allocating two antenna ports selectively to specific resource elements in turn rather than uniformly across all resources, the system improves downlink control channel performance where needed while minimizing overall resource overhead.
Data Source
AI summary
In the present invention, disclosed is a method for a base station transmitting a downlink control channel to a user equipment in a wireless communication system. More particularly, the method comprises the steps of: establishing resource element subsets comprising a plurality of resource elements; allocating a transmission resource for the downlink control channel in units of the resource element subsets; alternately allocating to the plurality of resource elements two antenna ports for demodulation-reference signal (DM-RS); and transmitting the downlink control channel to the user equipment through the transmission resource that is allocated by using the DM-RSs of the antenna ports that are allocated.