Buffer Status Report Synchronization With DRX Cycle Timing
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Solution Overview
Problem
In wireless communication systems, particularly with discontinuous reception (DRX) configured, ensuring periodic buffer status reports (BSR) are sent at every DRX cycle is challenging due to uncertainties in grant timing and DRX cycle configurations, leading to potential missed reports and increased overhead.
Innovation Solution
Implementing a mechanism where the periodic BSR timer is triggered at the start of the DRX on duration timer, with optional configurations for short and long DRX cycles, and conditional triggers based on logical channels and uplink grants to ensure consistent reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic BSR timer is triggered independently of DRX cycle timing, then BSR reporting can occur, but reports may be missed and overhead increases
Solution Approach 1:
The patent merges the BSR timer trigger event with the DRX on duration timer start event. Specifically, the periodic BSR timer is triggered when the DRX on duration timer is started, aligning the BSR reporting mechanism with the DRX cycle structure. This integration ensures that BSR reports are generated at appropriate DRX cycle boundaries, preventing missed reports while avoiding unnecessary reports during inactive periods, thus resolving the contradiction between reporting reliability and overhead reduction.
Solution Approach 2:
The patent implements periodic BSR reporting synchronized with the periodic DRX cycle structure. By triggering the periodic BSR timer at the start of each DRX on duration, the system establishes a regular periodic reporting pattern that matches the wake-up cycles of the UE. This periodic synchronization ensures reliable reporting at each active cycle while maintaining low overhead during sleep periods, directly addressing the technical contradiction.
2Loss of time
If BSR reports are sent at every DRX cycle, then buffer status information is timely, but unnecessary overhead increases when no uplink grant is present
Solution Approach 1:
The patent applies partial action by conditionally sending BSR reports only when necessary. Specifically, even though the periodic BSR timer is triggered at every DRX on duration start, the actual BSR report is sent only if an uplink grant is available and the buffer contains data. This conditional reporting mechanism ensures timely buffer status information is provided when the network can receive it, while avoiding unnecessary overhead when no uplink resources are allocated, thus resolving the contradiction between timeliness and overhead.
3Adaptability or versatility
If DRX on duration timer timing is uncertain, then flexibility in scheduling is maintained, but synchronization of BSR reports with DRX cycles becomes difficult
Solution Approach 1:
The patent uses preliminary action by triggering the periodic BSR timer at the very start of the DRX on duration timer. This early triggering ensures that the BSR reporting process is initiated before any potential timing uncertainties in the DRX cycle can cause misalignment. By establishing the BSR timer trigger event at this predetermined point in the DRX cycle, the system maintains synchronization without requiring complex timing adjustments, resolving the contradiction between scheduling flexibility and synchronization complexity.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for synchronization of buffer status reports with respect to other communication events, such as discontinuous reception cycles are provided. For example, a method can include receiving a configuration from a network, wherein the configuration comprises a discontinuous reception configuration, a report configuration, or both the discontinuous reception configuration and a report configuration. The method can also include starting a discontinuous reception on duration timer for a user equipment in accordance with the discontinuous reception configuration. The method can also include deciding to conditionally send a report for the user equipment upon the start of the discontinuous reception on duration timer in accordance with the configuration. The method can further include sending the report to the network if an uplink grant for the user equipment is preset.