Adjusting PMI Sizes for 5G Feedback Resource Allocation
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Solution Overview
Problem
In 5G wireless communication systems, the allocation of reference signals for multiple antennas reduces the frequency/time resources available for data transmission, leading to insufficient resources for data transmission due to the need for exclusive resources for each antenna's reference signal.
Innovation Solution
A method and device that adjust the sizes of Precoding Matrix Indicators (PMIs) based on channel conditions to efficiently transmit feedback information, allowing for accurate channel state information feedback and improving system performance by optimizing the allocation of resources between reference signals and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are allocated to separate resource elements for each transmitting antenna, then accurate channel information can be obtained by each antenna, but the number of frequency/time resources for data transmission is reduced
Solution Approach 1:
The patent combines reference signals from multiple antennas into a single resource element, allowing multiple antennas to share the same time-frequency resource. This merging approach enables the base station to transmit reference signals for multiple antennas simultaneously without requiring separate resource elements for each antenna, thereby resolving the contradiction between obtaining accurate channel information from each antenna and maintaining sufficient data transmission resources.
Solution Approach 2:
The patent implements a universal reference signal structure that serves multiple antennas simultaneously. By designing the reference signal to be transmittable from multiple antennas using the same resource element, the system achieves multi-functionality where a single reference signal carries information from multiple antennas, eliminating the need for exclusive resource allocation per antenna and thus improving data transmission capacity.
2Power
If more transmitting antennas are used to increase beamforming capability, then transmission gain is improved, but the number of available resource elements for data transmission decreases
Solution Approach 1:
The patent merges reference signals from multiple antennas into shared resource elements, allowing the system to support a larger number of transmitting antennas without proportionally increasing the number of required resource elements. This enables the system to maintain high transmission gain through advanced beamforming with multiple antennas while preserving sufficient resource elements for data transmission.
Solution Approach 2:
The patent dynamically adjusts the number of resource elements allocated for reference signals based on the number of transmitting antennas. By making the reference signal allocation flexible and adaptive rather than fixed, the system can optimize the balance between reference signal requirements and data transmission capacity as the number of antennas changes, thereby maintaining high transmission gain while maximizing data transmission capability.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A terminal in a wireless communication system according to an embodiment of the present invention comprises: a controller for determining a first size corresponding to a number of bits allocated for a first PMI (precoding matrix indicator) and a second size corresponding to a number of bits allocated for a second PMI; and a transmitting unit for transmitting feedback information, including the first PMI corresponding to the first size and the second PMI corresponding to the second size, to a base station.