Relay-Aware Transmission Timing for Uplink Signal Alignment
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Solution Overview
Problem
The existing uplink synchronization mechanisms in wireless communication systems are affected when signals are relayed by a network-controlled relay device, leading to misalignment of uplink signals from different user equipment (UEs) reaching the base station, which hinders correct decoding of uplink data.
Innovation Solution
A transmission timing adjustment method is implemented by determining and adjusting time offset quantization values for both the relay device and the base station, allowing UEs to accurately align their uplink signals by considering the relay device's and base station's uplink and downlink switching times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a relay device is introduced to extend coverage, then coverage area is improved, but uplink signal alignment deteriorates due to additional switching time
Solution Approach 1:
The timing offset compensation is segmented into two distinct components: a first timing offset quantization value for the relay device's uplink-downlink switching time, and a second timing offset quantization value for the base station's switching time. This segmentation allows each component to be independently calculated and compensated, ensuring accurate uplink signal alignment even when signals pass through relay devices.
Solution Approach 2:
The relay device acts as an intermediary between user equipment and the base station. The patent introduces a relay-specific timing offset parameter that compensates for the additional switching time introduced by this intermediary, allowing the relay device to extend coverage while maintaining signal synchronization through proper timing adjustment.
2Manufacturing precision
If timing offset quantization values are adjusted for relay devices, then uplink signal alignment is improved, but system complexity increases
Solution Approach 1:
The system dynamically adapts timing offset values based on whether a relay device is involved in the signal path. The base station determines the first timing offset quantization value when relay devices are present, and this value is dynamically adjusted and communicated to user equipment through downlink control information, allowing flexible adaptation without permanent system restructuring.
Solution Approach 2:
The patent introduces new timing offset parameters (first and second timing offset quantization values) that change based on the network configuration. These parameters are dynamically updated and communicated to user equipment, allowing the system to maintain simplicity by using standard signaling mechanisms while adapting timing parameters to match the actual signal path characteristics.
Data Source
AI summary
A method, apparatus and computer readable medium for transmission timing adjustment in a wireless communication network. The transmission timing adjustment is performed by: determining by a base station a first time offset quantization value, wherein the first time offset quantization value at least represents a time for which a relay device performs uplink and downlink switching; and sending by the base station a timing advance offset (TA-offset) quantization value to a user equipment (UE) according to the first time offset quantization value and a second time offset quantization value, wherein the second time offset quantization value at least represents a time for which the base station performs uplink and downlink switching, and the TA-offset quantization value is used by the UE to adjust transmission timing.