Distributed Resource Allocation for Downlink Control Channel Diversity
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in achieving diversity gain for downlink control channels due to limitations in resource allocation methods, leading to inefficiencies in data transmission and reception.
Innovation Solution
The method involves allocating antenna ports to resource elements in a cyclic manner across resource blocks, allowing for distributed resource allocation to enhance spatial diversity gain for downlink control channels, thereby improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distributed resource allocation is applied to downlink control channel, then spatial diversity gain is improved, but resource allocation complexity increases
Solution Approach 1:
The resource elements are divided into multiple resource element groups, with each group allocated to different antenna ports. This segmentation enables distributed resource allocation across multiple antennas, achieving spatial diversity gain while managing complexity through structured grouping
Solution Approach 2:
Different antenna ports are assigned to different resource element groups within resource blocks, creating local variations in resource allocation. This allows each antenna to transmit on specific resources, improving spatial diversity without requiring complete redistribution of all resources
2Reliability
If antenna ports are allocated to resource elements in cyclic manner, then transmission reliability is improved, but processing complexity increases
Solution Approach 1:
Antenna ports are allocated to resource elements in a cyclic manner, creating a periodic pattern that repeats across resource blocks. This periodic allocation simplifies the processing complexity by establishing a predictable, repeating structure while still achieving diverse spatial transmission paths for improved reliability
3Productivity
If distributed resource allocation is used across resource blocks, then data transmission efficiency is improved, but resource management complexity increases
Solution Approach 1:
Resource blocks are segmented into multiple resource element groups that are distributed across different antenna ports. This segmentation enables efficient parallel transmission through multiple spatial paths, improving data transmission efficiency while maintaining manageable resource allocation through systematic grouping
Solution Approach 2:
The patent introduces spatial distribution as an additional dimension for resource allocation, distributing resource element groups across multiple antenna ports in addition to the traditional time-frequency resource block structure. This dimensional expansion improves transmission efficiency by utilizing spatial diversity without fundamentally complicating the base resource management structure
Data Source
AI summary
In the present invention, disclosed is a method for a base station transmitting a downlink control channel to user equipment in a wireless communication system. More specifically, the method comprises the steps of configuring resource elements, which are included in each of a plurality of resource blocks, as a plurality of resource element groups comprising a predetermined number of resource elements; allocating antenna ports to the resource elements which are included in each of the plurality of resource element groups; allocating as a transmission resource for the downlink control channel, at least one resource element group from each of the plurality of resource blocks; and transmitting the downlink control channel to the user equipment by using the transmission resource.