Wireless Timing Advance Update via HARQ Retransmission
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in accurately transmitting updated timing advances to user equipment, particularly when the timing advance changes rapidly due to movement, leading to decoding errors and reduced transmission efficiency.
Innovation Solution
The implementation of an electronic apparatus with processing circuitry that uses a Hybrid Automatic Repeat Request (HARQ) mechanism to transmit and receive updated timing advances, ensuring that the user equipment receives the correct timing advance by distinguishing between initial and retransmitted information through different HARQ processes and DCI signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a base station retransmits a Timing Advance (TA) command to user equipment using HARQ mechanism, then transmission reliability is improved, but transmission delay increases due to Round-Trip Delay (RTD)
Solution Approach 1:
The base station performs uplink scheduling immediately in the next time slot upon completion of sending a TA command, rather than waiting for HARQ ACK feedback. This preliminary action reduces transmission delay by proactively allocating uplink resources before the HARQ confirmation is received, effectively decoupling the TA update timing from the HARQ round-trip delay.
2Stability of the object's composition
If a base station retransmits the original TA command to user equipment, then transmission consistency is maintained, but timing accuracy deteriorates when TA changes rapidly
Solution Approach 1:
The base station dynamically determines whether to retransmit the original TA command or send an updated TA command based on whether the TA has changed. This dynamic approach allows the system to maintain transmission consistency when TA is stable while adapting to send updated TA values when timing conditions change, thereby preserving timing accuracy in rapidly changing scenarios.
Solution Approach 2:
The base station monitors TA changes and uses this feedback information to decide the retransmission strategy. When TA updates are detected, the base station sends the updated TA command instead of the original one, ensuring that user equipment receives accurate timing information even during rapid TA changes.
3Measurement precision
If a base station sends updated TA command during HARQ retransmission process, then timing accuracy is improved, but information loss occurs at user equipment
Solution Approach 1:
The patent introduces an intermediary mechanism where the base station sends Downlink Control Information (DCI) to notify user equipment about the TA update status. This intermediary signaling ensures that user equipment can correctly interpret whether the received TA command is original or updated, preventing information loss and decoding errors by providing contextual information about the TA version.
Data Source
AI summary
Provided in the present application is an electronic device for wireless communication. The electronic device comprises a processing circuit, wherein the processing circuit is configured to: during the process of using a hybrid automatic repeat request (HARQ) mechanism to retransmit, to a user equipment within a service range of an apparatus that is related to the electronic device, first information regarding a first timing advance of the user equipment, when the first timing advance is updated, transmitting, to the user equipment, second information regarding a second timing advance, wherein the second timing advance is the updated first timing advance.