Small Data Transmission with Priority Retention After MAC Reset
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Solution Overview
Problem
Existing wireless communication technologies face challenges in maintaining fairness and quality of service (QoS) for logical channels during small data transmission in RRC_IDLE or RRC_INACTIVE states, particularly due to MAC reset operations and lack of QoS management in access stratum layers.
Innovation Solution
Implementing a method that maintains a priority variable for each logical channel, adjusts the priority variable after MAC reset messages, and uses pre-configured resources for small data transmission via RACH-based schemes, ensuring fairness and QoS through logical channel prioritization procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MAC reset operation is performed after data transmission, then the system returns to initial state for next transmission, but fairness for traffics in logical channels with low priorities deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the treatment of priority variables based on logical channel priorities. High priority channels have their priority variables reset to initial values, while low priority channels maintain their accumulated priority variable values. This selective reset approach ensures that low priority traffic is not unfairly disadvantaged by the MAC reset operation, thereby maintaining traffic fairness while still managing system state effectively.
2Reliability
If MAC reset operation is performed after data transmission, then system resources are reallocated, but QoS management for logical channels deteriorates
Solution Approach 1:
The patent implements local quality by applying different reset behaviors to priority variables based on QoS requirements of different logical channels. Channels with stringent QoS requirements maintain their priority variable values across MAC reset operations, ensuring continuous QoS compliance, while other channels undergo full reset. This selective approach preserves QoS management quality while still enabling resource reallocation.
3Reliability
If priority variable is reset to initial value after MAC reset, then system state is standardized, but power consumption increases due to repeated priority calculations
Solution Approach 1:
The patent applies preliminary action by maintaining priority variable values in a preserved state before MAC reset operations. Instead of performing full reset and subsequent recalculation, the system preserves the priority variable values and restores them after reset, avoiding repeated priority calculations. This reduces computational overhead and power consumption while still achieving the necessary state consistency for system operation.
4Productivity
If EDT procedure is used for small data transmission, then transmission efficiency is improved, but complexity of managing QoS and fairness increases
Solution Approach 1:
The patent reduces QoS management complexity by applying local quality differentiation to priority variable handling. Instead of implementing complex QoS management mechanisms across all logical channels, the system applies simple selective reset rules: high priority channels are reset while low priority channels maintain their values. This simplifies the QoS management logic while still achieving fair and efficient small data transmission through the EDT procedure.
Data Source
AI summary
Embodiments of the present application relate to a method and an apparatus for or small data transmission of a user equipment (UE) in an RRC_IDLE state or an RRC_INACTIVE state. According to an embodiment of the present application, a method can include: a method may include maintaining a priority variable for each logical channel of at least one logical channel; determining a value of the priority variable for each logical channel after performing a first logical channel prioritization (LCP) procedure; receiving a message indicating a MAC reset; and after receiving the message, in a second LCP procedure subsequent to the first LCP procedure, using the value as an initial value of the priority variable for each logical channel of the at least one logical channel. Embodiments of the present application can satisfy the QoS requirement and fairness for the traffics transmitted in the logical channels in NR systems.


