Adaptive MBS HARQ Retransmission via Dynamic Resource Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in improving the reliability of Multicast and Broadband Services (MBS) communications due to high propagation delays and the lack of effective reception feedback mechanisms.
Innovation Solution
The proposed solution involves an apparatus and method where a base station selects a retransmission procedure for MBS services from multiple available procedures. Upon receiving a negative-acknowledgement (NACK) message from a user equipment (UE), the base station responds based on the selected procedure, which can include retransmitting data using allocated MBS resources, unicast resources, or omitting retransmission altogether.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If retransmission is performed using MBS resources, then resource utilization efficiency is improved, but reliability is worsened due to high propagation delays and lack of feedback mechanisms
Solution Approach 1:
The patent implements dynamic retransmission procedures where the base station can adaptively switch between different retransmission modes (MBS resource retransmission, unicast resource retransmission, or no retransmission) based on received NACK feedback. This dynamic approach allows the system to optimize between resource efficiency and reliability depending on channel conditions and service requirements
Solution Approach 2:
The patent introduces HARQ feedback mechanisms where UEs send NACK messages to the base station when data reception fails. This feedback enables the base station to make informed decisions about retransmission, transforming the open-loop MBS system into a closed-loop system that can improve reliability through adaptive retransmission based on actual reception outcomes
2Adaptability or versatility
If multiple retransmission procedures are available, then adaptability is improved, but device complexity is worsened
Solution Approach 1:
The patent segments the retransmission functionality into distinct, well-defined procedures: MBS resource retransmission procedure, unicast resource retransmission procedure, and no retransmission option. Each procedure is independently specified with clear conditions for selection, which reduces the overall complexity by avoiding a monolithic complex decision-making system
Solution Approach 2:
The patent changes key parameters such as the retransmission mode indicator, resource allocation type, and HARQ process ID to manage different retransmission scenarios. By parameterizing the retransmission behavior, the system achieves adaptability while maintaining manageable complexity through standardized parameter handling and interpretation
3Reliability
If NACK feedback is implemented, then reliability is improved, but loss of time is worsened due to feedback transmission delay
Solution Approach 1:
The patent implements preliminary HARQ feedback configuration where UEs are pre-configured with uplink resources for NACK transmission. This preliminary setup allows feedback to be sent immediately upon detection of errors without requiring resource allocation negotiations, thereby reducing the time loss associated with feedback transmission while maintaining reliability improvements
Data Source
AI summary
This disclosure relates to apparatuses and methods for providing and managing reception feedback for multicast and broadcast services (MBS). A base station (BS) may select and communicate, to a group of user equipment devices (UEs), configuration parameters for MBS communications, such as an indication of an MBS retransmission procedure for an MBS service. The BS may also transmit, to the group of UEs, an MBS data communication. A first UE may receive the MBS data communication, but may determine that the received MBS data communication is corrupted. The first UE may respond by transmitting, to the BS, a negative-acknowledgement (NACK) message. The BS may retransmit the MBS data communication either as an MBS transmission or as a unicast transmission, based on the configuration parameters. The first UE may monitor the appropriate resources to receive the retransmitted MBS data communication, based on the configuration parameters.