Scheduling Timer for Dynamic Delayed Transmission ACK Reception
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Solution Overview
Problem
In LTE networks, the existing timer settings for dynamically-delayed scheduling often expire too early, leading to increased latency and degraded TCP performance, as they do not adequately compensate for varying delays in transmission validity times, causing UEs to miss TCP acknowledgments when not actively monitoring the PDCCH.
Innovation Solution
A method where a UE starts a timer associated with dynamically-delayed scheduling, with a configured start time and duration that ensures the UE remains active to receive acknowledgments for dynamically-delayed transmissions, potentially extending the timer duration beyond traditional settings to account for delayed grant validity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the timer duration is extended to cover dynamically-delayed scheduling, then the UE can receive TCP acknowledgments, but the UE remains active longer consuming more battery power
Solution Approach 1:
The patent applies dynamics by making the timer duration adaptable rather than fixed. The timer is configured based on the actual dynamically-delayed scheduling parameters, allowing it to extend only as long as necessary to cover the delayed grant validity period. This dynamic adjustment ensures the UE remains active long enough to receive ACKs without unnecessarily extending activity time and consuming extra power.
Solution Approach 2:
The patent changes the timer parameter from a fixed value to a configurable value that adapts to dynamically-delayed scheduling requirements. By modifying the timer duration parameter based on the specific delay characteristics of the scheduled transmissions, the system optimizes the balance between reliability (ensuring ACK reception) and energy efficiency (minimizing active time).
2Loss of time
If the timer expires early according to traditional settings, then the UE saves battery power by entering sleep mode, but the UE misses TCP acknowledgments and experiences increased latency
Solution Approach 1:
The patent applies preliminary action by configuring the timer in advance based on the dynamically-delayed scheduling parameters before the actual transmissions occur. This pre-configuration ensures that the timer will expire at the correct time to allow ACK reception, preventing both premature expiration (which would cause latency) and excessive extension (which would waste power).
Solution Approach 2:
The system uses feedback from the scheduling configuration to adjust the timer duration. By monitoring the dynamically-delayed scheduling parameters and using this information to configure the appropriate timer value, the system optimizes the trade-off between latency and power consumption based on actual network conditions and transmission requirements.
Data Source
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AI summary
A method in a user equipment (110) comprises receiving (604) a grant (305, 405, 505), the grant scheduling one or more dynamically-delayed transmissions (310A-C, 410A-C, 510A- C) for the user equipment. The method comprises in response to receiving the grant, starting (608) a timer associated with dynamically-delayed scheduling, wherein at least one of a start time of the timer and a duration of the timer is configured such that the user equipment is active when an acknowledgement of the one or more dynamically-delayed transmissions is expected to be received by the user equipment.