MBS Time-Domain Resource Allocation for State-Based TDRA Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current NR MBS technologies face challenges in determining appropriate time domain resource allocation (TDRA) lists for multicast and broadcast traffic, particularly for terminal devices in idle or inactive states without an active RRC connection, leading to misinterpretation of TDRA fields in DCI formats 1_0 and 1_1.
Innovation Solution
A mechanism to determine TDRA lists based on identifiers for scrambling DCI, RRC state, and type of traffic configured for the terminal device, ensuring a common understanding of TDRA fields for devices receiving multicast, broadcast, and unicast traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DCI formats 1_0 and 1_1 are used for scheduling multicast traffic PDSCH resources, then unicast scheduling mechanisms can be maintained, but terminal devices in idle or inactive states cannot properly interpret TDRA fields
Solution Approach 1:
The patent applies local quality by configuring different TDRA tables for different RRC states. Terminal devices in RRC_CONNECTED state use one TDRA table configuration, while devices in RRC_IDLE or RRC_INACTIVE states use another TDRA table configuration. This allows the system to maintain compatibility with unicast scheduling mechanisms while ensuring reliable TDRA field interpretation for multicast traffic specifically针对 each state's characteristics.
2Device complexity
If a single TDRA configuration is used for all terminal devices, then system complexity is reduced, but optimal resource allocation for different RRC states cannot be achieved
Solution Approach 1:
The patent implements dynamics by making the TDRA table selection dynamic based on the terminal device's RRC state. The network device determines which TDRA table to use based on whether the terminal is in RRC_CONNECTED, RRC_IDLE, or RRC_INACTIVE state. This dynamic adaptation allows optimal resource allocation for different states while the terminal device follows clear state-based selection rules, balancing complexity and efficiency.
3Measurement precision
If multiple TDRA tables are configured for different RRC states, then accurate resource allocation is achieved, but terminal device complexity increases
Solution Approach 1:
The patent applies self-service by enabling terminal devices to autonomously select the appropriate TDRA table based on their own RRC state without requiring complex network signaling or device intervention. The selection rule is state-dependent: devices in RRC_CONNECTED use one configuration, while devices in RRC_IDLE or RRC_INACTIVE use another. This self-service approach achieves accurate resource allocation while keeping terminal device complexity manageable through clear, state-based selection criteria.
Data Source
AI summary
Embodiments of the present disclosure relate to time domain resource allocation for multicast broadcast service. A first device receives, from a second device, DCI comprising a TDRA field, and determines, based on at least one of an identifier for scrambling the DCI, a RRC state of the first device or a type of traffic configured for the first device, a TDRA list from a set of configurations for TDRA. Then the first device applies, based on the TDRA list, the TDRA field for reception of the traffic from the second device. In this way, a TDRA list to be used may be determined in an optimal manner, with all terminal devices receiving multicast and broadcast traffic determining common values for time domain resources where data traffic would be scheduled.