Adaptive Array Antenna Frequency Band Synchronization for Beam Forming
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Solution Overview
Problem
In conventional wireless communication systems like TD-LTE, the difference in frequency bands between uplink and downlink resources allocated to a mobile station with an adaptive array antenna hinders the achievement of desired antenna directivity, leading to incorrect beam forming towards the base station.
Innovation Solution
The mobile station transmits a message to the base station indicating the presence of an adaptive array antenna, and the base station assigns the same frequency band for uplink resource blocks as for the preceding downlink resource blocks, allowing the mobile station to control the antenna based on the downlink signal for optimal directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station separately allocates uplink and downlink resource blocks without associating them, then resource allocation flexibility is improved, but frequency band consistency between uplink and downlink deteriorates
Solution Approach 1:
The mobile station performs preliminary detection of frequency band differences between uplink and downlink resource blocks, and proactively reports this information to the base station. This preliminary action enables the base station to adjust subsequent resource allocations to maintain frequency band consistency, resolving the contradiction between allocation flexibility and consistency reliability.
2Extent of automation
If the mobile station controls the adaptive array antenna based on downlink signals, then antenna directivity control capability is improved, but beam forming accuracy deteriorates when frequency bands differ
Solution Approach 1:
The mobile station detects frequency band differences and feeds back this information to the base station. The base station uses this feedback to adjust resource block allocations, ensuring that uplink and downlink operate in the same frequency band. This feedback mechanism maintains both automated antenna control capability and beam forming accuracy.
3Productivity
If the base station allocates different frequency bands for uplink and downlink, then spectrum utilization efficiency is improved, but antenna weight calculation accuracy deteriorates
Solution Approach 1:
The mobile station performs preliminary detection of frequency band allocations and reports any mismatches to the base station before transmission occurs. This allows the base station to correct resource block assignments in advance, ensuring frequency band consistency for accurate antenna weight calculation while maintaining overall spectrum utilization efficiency.
Data Source
AI summary
Provided is, in wireless communication systems such as TD-LTE where there might be difference in frequency band allocated to a mobile station between uplink and downlink, a wireless communication system which is capable of ensuring desired antenna directivity by the mobile station controlling an adaptive array antenna, such a method for controlling a wireless communication system, such a base station, and such a mobile station. The mobile station transmits to the base station a message indicating that the self station includes an adaptive array antenna. Upon receiving the message, the base station assigns a downlink resource block and an uplink resource block following the downlink resource block allocated to the mobile station within the same frequency band. The mobile station 1 controls the adaptive array antenna based on a signal received using the allocated downlink resource block and transmits a signal using the allocated uplink resource block.