Mobile Station HARQ Control During Gap Periods
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Solution Overview
Problem
The existing HARQ control methods in LTE mobile communication systems face challenges during gap periods when the mobile station cannot receive HARQ indicators or uplink scheduling grants, leading to unclear retransmission timing and resource allocation issues.
Innovation Solution
A mobile station and base station apparatus configuration that transmits the uplink shared signal at a first time interval instructed by the base station and retransmits it at a second time interval allocated fixedly, with specific handling of HARQ control during gap periods to ensure efficient and robust communication by presuming ACK receipt and delaying retransmission until instructed by the uplink scheduling grant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the mobile station uses fixed time intervals for HARQ control, then the control mechanism is simple, but retransmission timing becomes unclear during gap periods
Solution Approach 1:
The patent applies dynamics by making the HARQ control mechanism adaptive rather than fixed. The mobile station dynamically determines retransmission timing based on whether the current sub-frame falls within a gap period or not. When in a gap period, the station waits for the next available opportunity, while outside gap periods it follows the standard fixed interval. This dynamic adjustment resolves the contradiction between simplicity and reliability.
Solution Approach 2:
The patent changes the parameter of time interval handling based on the operational context. During gap periods, the effective time interval for HARQ control is extended or adjusted, while outside gap periods the standard interval is maintained. This parameter change allows the system to maintain simplicity in normal operation while ensuring reliability during gap periods through conditional parameter adjustment.
2Manufacturing precision
If the mobile station waits for uplink scheduling grant during gap periods, then resource allocation is accurate, but retransmission delay increases
Solution Approach 1:
The patent applies preliminary action by having the mobile station prepare for potential retransmission during gap periods. The station maintains the ability to retransmit immediately after the gap period ends if needed, rather than waiting for a new scheduling grant. This preliminary preparation reduces the effective delay while maintaining accurate resource allocation through the uplink scheduling grant mechanism.
Solution Approach 2:
The patent makes the retransmission timing dynamic by allowing immediate retransmission after gap periods rather than forcing a fixed delay. The mobile station dynamically decides whether to retransmit based on the gap period status and the received uplink scheduling grant, optimizing both resource allocation accuracy and time loss reduction through adaptive timing.
3Productivity
If the base station transmits HARQ indicator during gap periods, then communication efficiency is high, but the mobile station cannot receive it
Solution Approach 1:
The patent converts the harmful effect of gap periods (which prevent signal reception) into a beneficial state by using the gap period information to control transmission behavior. The base station knows when the mobile station is in a gap period and adjusts transmission accordingly, using this knowledge to optimize communication efficiency while respecting the reception limitations during gap periods.
Solution Approach 2:
The base station applies preliminary action by preparing transmission timing in advance, avoiding transmission during gap periods when the mobile station cannot receive signals. The base station schedules HARQ indicators and uplink scheduling grants for times when the mobile station is ready to receive them, preventing wasted transmission opportunities and optimizing overall communication efficiency.
Data Source
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AI summary
A mobile station (100) according to the present invention includes: a transmitter unit (1110) configured to transmit an uplink shared signal at a first time interval based on a received first downlink control signal; and a retransmitter unit (110) configured to retransmit the uplink shared signal at a second time interval based on a second downlink control signal received at a third time interval allocated fixedly. When the third time interval overlaps a time interval for measurement by the mobile station (100), the transmitter unit (110) is configured to transmit the uplink shared signal at the first time interval and the retransmitter unit (110) is configured not to retransmit the uplink shared signal at the second time interval.