Uplink Signal Adjustment via Feedback Time Delay Compensation
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP networks, the user equipment faces challenges in accurately adjusting uplink signals due to unknown transmission power control (TPC) delays, leading to incorrect antenna selection and beamforming, which degrades uplink performance and increases power consumption and interference.
Innovation Solution
A method and arrangement that involve compensating for the time delay of feedback signals received from the network node, allowing the user equipment to accurately adjust uplink signals based on relevant feedback, thereby selecting the correct antenna and beamforming direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If uplink transmit diversity is implemented without knowing TPC delay, then antenna selection and beamforming can be performed, but incorrect antenna selection and beamforming occur leading to degraded uplink performance
Solution Approach 1:
The patent implements a feedback mechanism where the network node measures the actual TPC delay and feeds this information back to the user equipment. This feedback loop enables the UE to synchronize its antenna selection and beamforming operations with the actual feedback timing, resolving the mismatch between assumed and actual TPC delay values.
Solution Approach 2:
The patent performs preliminary measurement of the TPC delay by the network node before the UE attempts antenna selection. By measuring and communicating the actual delay value in advance, the system prepares the necessary timing information that the UE needs to correctly align its transmit diversity operations with the feedback timing.
2Productivity
If TPC delay is not compensated, then uplink transmission can proceed without additional processing, but power consumption increases and interference is generated due to incorrect adjustments
Solution Approach 1:
The network node measures and communicates the actual TPC delay to the user equipment, enabling the UE to compensate for timing mismatches. This feedback mechanism allows the UE to correctly align its power adjustment and beamforming operations, preventing wasted energy transmission and reducing interference to other users.
3Reliability
If the network node measures and provides TPC delay information, then uplink performance is improved, but device complexity and processing overhead increase
Solution Approach 1:
The network node autonomously measures its own TPC delay without requiring external assistance or complex coordination with other network elements. This self-service approach simplifies the overall system architecture while still providing the necessary timing information to improve uplink performance.
Data Source
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AI summary
Method and arrangement in a user equipment for adjusting signals transmitted in uplink to a network node based on a feedback value received from the network node. The method includes transmitting a signal, to be received by the network node. A feedback signal is received from the network node, providing feedback on the transmitted signal. A value of a time delay of the received feedback signal is obtained. Signals transmitted in the uplink are adjusted according to the received feedback signal to compensate for the obtained time delay value of the received feedback signal. Related methods and arrangements in a network node are presented.