Antenna Selection Signaling in OFDMA Wireless Networks
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Solution Overview
Problem
Current antenna selection protocols for OFDMA 3GPP wireless networks lack a standardized signaling and message structure for efficient antenna selection in large-range outdoor environments, particularly for uplink communications, which limits their effectiveness and adaptability.
Innovation Solution
A method and system utilizing three levels of signaling (Level-A, Level-B, and Level-C) for antenna selection in OFDM wireless networks, employing sounding reference frames to support periodic and adaptive configurations, and enabling switching between different SRS types, including wideband, variable bandwidth, and narrow-band signals, to facilitate efficient antenna selection and packet retransmission in both asynchronous and synchronous HARQ modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO antenna technology is used to enhance system performance, then system capacity, transmission reliability, and throughput are improved, but hardware cost, signal processing complexity, power consumption, and component size increase
Solution Approach 1:
The patent segments the MIMO antenna system into two functional parts: a subset of antennas for active signal transmission/reception and a remaining subset for diversity or MIMO operation. This segmentation allows the system to achieve MIMO performance with fewer active RF chains, thereby reducing hardware cost and complexity while maintaining system capacity.
Solution Approach 2:
The patent applies partial action by activating only a subset of antennas for primary communication functions while keeping other antennas in a lower-power or standby mode. This partial activation reduces power consumption and hardware utilization costs while still achieving the required system capacity through selective antenna usage.
2Reliability
If MIMO antenna technology is used to improve transmission reliability and throughput, then system performance is enhanced, but signal processing complexity and power consumption increase
Solution Approach 1:
The patent divides the antenna array into active and inactive subsets, where only the active subset consumes full power for signal processing. The inactive antennas consume minimal power while still contributing to transmission reliability through diversity reception or as backup resources, thereby reducing overall power consumption while maintaining reliability.
Solution Approach 2:
The system uses partial action by engaging only the necessary number of antennas for active communication, reducing the computational burden and power consumption associated with processing signals from all antennas, while still achieving the required transmission reliability through selective MIMO operation.
3Device complexity
If a subset of antennas is adaptively selected to reduce complexity, then hardware cost and processing complexity are reduced, but system adaptability and performance in large-range outdoor environments may be limited
Solution Approach 1:
The patent implements dynamic antenna selection where the subset of active antennas is adaptively changed based on channel conditions, user position, and traffic requirements. This dynamic reconfiguration allows the system to maintain low complexity by using a limited number of active RF chains while achieving high adaptability to varying outdoor propagation conditions through intelligent antenna switching.
Solution Approach 2:
The system employs feedback mechanisms to monitor channel quality and performance metrics, using this information to dynamically adjust which antennas are active in the subset. This feedback-driven adaptation enables the system to optimize performance for large-range outdoor environments while maintaining reduced complexity through selective antenna usage.
Data Source
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AI summary
A method and system selects antennas in a wireless network including a base station and user equipment (UE) transceivers. The base station specifies times and frequencies to transmit sounding reference signals (SRSs), and antennas to use to transmit the SRSs for the specified times and frequencies. The transceivers transmit the SRS according to the specified times, frequencies, and antennas. The base station selects subsets of antennas of available sets of antennas, and indicates the selected subset of antennas to the transceiver.