Auxiliary MIMO Pilot Transmission Power Allocation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting a wide range of user device types and capabilities, particularly in integrating multiple-input, multiple-output (MIMO) devices with legacy single-input, single-output (SISO) systems, while maintaining system throughput and user experience.
Innovation Solution
The solution involves reallocating transmission power to transmit auxiliary MIMO pilot signals on unused Walsh codes during transmission time slots, allowing MIMO devices to perform channel estimation and demodulation, while minimizing disruption to SISO devices by interspersing MIMO data segments with control segments containing SISO pilot signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission power is reallocated to transmit auxiliary MIMO pilot signals, then MIMO device channel estimation capability is improved, but available power for data transmission is reduced
Solution Approach 1:
The transmission time slot is segmented into control segments containing SISO pilot signals and data segments containing MIMO data. Auxiliary MIMO pilot signals are transmitted selectively in data segments only when MIMO devices are scheduled, while SISO devices receive pilots in control segments. This segmentation allows power to be allocated differently across segments, providing MIMO pilots when needed without continuously reducing data power.
Solution Approach 2:
Auxiliary MIMO pilot signals are transmitted periodically in data segments at scheduled intervals rather than continuously. The base station transmits these pilots only during data segments when MIMO access terminals are actively scheduled for data transmission, creating a periodic transmission pattern that reduces overall power consumption compared to continuous pilot transmission.
2Adaptability or versatility
If auxiliary MIMO pilot signals are transmitted on unused Walsh codes, then MIMO device support is improved, but interference with SISO devices may increase
Solution Approach 1:
The transmission is segmented into control segments for SISO devices and data segments for MIMO devices. SISO pilot signals occupy specific Walsh codes in control segments, while auxiliary MIMO pilot signals use different unused Walsh codes in data segments. This segmentation in both time and code domains ensures that SISO and MIMO signals do not interfere with each other, as they operate in separated resources.
Solution Approach 2:
The solution moves the auxiliary MIMO pilot transmission to a different dimension by using unused Walsh codes (code domain) in data segments (time domain) rather than overlapping with SISO pilot signals. This multi-dimensional separation in code and time domains allows both SISO and MIMO devices to operate simultaneously without mutual interference.
3Productivity
If MIMO and SISO systems are integrated in the same transmission time slot, then system throughput is improved, but device complexity increases
Solution Approach 1:
The transmission time slot is divided into control segments containing SISO pilot signals and data segments containing MIMO data with auxiliary pilots. This segmentation allows the base station and access terminals to process SISO and MIMO transmissions separately in different segments, reducing the complexity of simultaneously handling both types in the same resource elements while still achieving integrated operation across the full time slot.
Solution Approach 2:
The transmission time slot structure is designed to be universal, supporting both SISO and MIMO devices within the same overall framework. Control segments serve SISO devices while data segments can serve both SISO devices (with appropriate pilot allocation) and MIMO devices (with auxiliary pilots), creating a multi-functional transmission structure that accommodates different device types without requiring separate dedicated time slots.
Data Source
AI summary
Systems and methodologies are described that facilitate providing auxiliary multiple-input, multiple-output (MIMO) pilot signals to MIMO user devices in a wireless communication environment. According to some aspects, a portion of data transmission power may be reallocated for auxiliary MIMO pilot transmission during a data segment in a time slot, in order to permit a MIMO user device to perform CQI and rank prediction. Additionally or alternatively, non-MIMO pilot transmission power may be reallocated in a pilot segment in the time slot for transmission of an auxiliary MIMO pilot signal to permit the MIMO user device to demodulate data transmitted in data segments of the time slot. MIMO pilot signals may additionally be time-division multiplexed within or across time slots and may be transmitted over available Walsh codes in data and control segments.