Uplink Resource Allocation for Aperiodic CQI Reports in LTE
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Solution Overview
Problem
In 3GPP LTE communication systems, the ambiguity in allocating uplink transmission time intervals for aperiodic channel quality indicator reports leads to inefficient resource allocation and scheduling challenges, particularly when multiple uplink time intervals are allocated simultaneously.
Innovation Solution
A method and apparatus that include a communication resource allocator to select and allocate transmission time intervals for aperiodic data packets, such as channel quality indicator reports, during one, both, or multiple uplink scheduling windows, using a two-bit uplink transmission time interval index to resolve ambiguity and optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple uplink transmission time intervals are allocated to user equipment by a single resource grant, then resource utilization efficiency is improved, but ambiguity arises in determining which time interval should be used for transmitting aperiodic channel quality indicator reports
Solution Approach 1:
The patent segments the transmission time interval selection by dividing it into distinct cases: single TTI allocation and multiple TTI allocations. For multiple TTI allocations, it further segments the solution by introducing different behaviors based on the presence or absence of the early TTI flag, thereby resolving the ambiguity through structured classification of allocation scenarios
Solution Approach 2:
The patent applies preliminary action by pre-defining the transmission time interval selection rules before actual transmission occurs. The early TTI flag is predetermined in the resource grant, and the selection criteria are established in advance through specification, eliminating the need for real-time decision-making and resolving ambiguity proactively
Solution Approach 3:
The patent introduces an intermediary mechanism - the early TTI flag - that mediates between the resource grant and the transmission time interval selection. This flag acts as a clear indicator that bridges the gap between multiple allocated TTIs and the specific TTI to be used for aperiodic CQI reports, eliminating ambiguity through a dedicated signaling element
2Reliability
If a single uplink transmission time interval is allocated, then transmission timing is clear and unambiguous, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the transmission time interval selection flexible and adaptive rather than fixed. The system dynamically adjusts between single TTI and multiple TTI allocations based on scheduling needs, and within multiple TTI allocations, dynamically selects the appropriate TTI for aperiodic CQI reports based on the early TTI flag, thereby maintaining both clarity and efficiency
3Adaptability or versatility
If multiple uplink transmission time intervals are allocated simultaneously, then scheduling flexibility is improved, but signaling overhead and scheduling complexity increase
Solution Approach 1:
The patent applies local quality by applying different rules to different parts of the scheduling process. Instead of using a single complex rule for all scenarios, it applies specific local rules: when early TTI flag is set, use first TTI; when not set, use second TTI. This localized rule application simplifies the overall scheduling complexity while maintaining flexibility
Data Source
AI summary
Apparatus and methods for allocating communication resources for an aperiodic data packet in a communication system. A transmission time interval for an aperiodic data packet including a channel quality indicator report is allocated during at least one of a first transmission time interval and a second transmission time interval in an uplink scheduling window in accordance with an uplink scheduling grant by a network entity, and a message is assembled including said aperiodic data packet for transmission to said network entity during said at least one of said first transmission time interval and said second transmission time interval.