MBS HARQ Feedback Enablement for DRX Retransmission Control
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Solution Overview
Problem
Existing communication networks face challenges in efficiently managing hybrid automatic repeat request (HARQ) processes, particularly in scenarios involving multiple technologies and releases, leading to suboptimal performance and resource utilization.
Innovation Solution
Implementing a mechanism for dynamic HARQ feedback control based on network conditions and device capabilities, allowing for selective enablement of HARQ processes in wireless devices and base stations, optimizing resource allocation and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is continuously transmitted in all scenarios, then data transmission reliability is improved, but network overhead and latency increase
Solution Approach 1:
The patent implements dynamic HARQ feedback control where the network device adjusts HARQ feedback transmission based on real-time conditions. The second message indicating HARQ feedback enablement is sent dynamically according to network status and device capabilities, allowing the system to switch between feedback and no-feedback modes adaptively, thereby reducing unnecessary latency while maintaining reliability when needed.
Solution Approach 2:
The patent changes the parameter of HARQ feedback enablement dynamically. The network device controls whether HARQ feedback is enabled by sending a second message that can activate or deactivate feedback based on current network conditions, device capabilities, and service requirements, optimizing the balance between reliability and latency.
2Reliability
If HARQ feedback is enabled in all cases, then data transmission reliability is improved, but network overhead increases
Solution Approach 1:
The patent applies local quality by enabling HARQ feedback selectively in specific scenarios rather than universally. The network device determines which scenarios require HARQ feedback based on local conditions such as service type, device capabilities, and network status, sending the enablement message only where needed, thus reducing overall network overhead while maintaining reliability in critical scenarios.
Solution Approach 2:
The patent implements partial action by enabling HARQ feedback only in certain scenarios rather than all scenarios. The network device selectively activates feedback mechanisms based on specific conditions, applying HARQ only where necessary to achieve reliability goals without incurring the overhead of universal feedback transmission.
3Device complexity
If HARQ processes are managed with fixed configurations, then system complexity is reduced, but adaptability to different technologies and releases deteriorates
Solution Approach 1:
The patent implements universality by designing a HARQ feedback control mechanism that works across multiple technologies and releases. The second message format and control approach are designed to be technology-agnostic, allowing the same mechanism to function in NR, LTE, and other wireless technologies, as well as across different 3GPP releases, thereby achieving multi-functionality without increasing complexity.
Solution Approach 2:
The patent introduces dynamic control to HARQ processes through the network-sent second message, allowing the system to adapt to different technologies and releases dynamically. This dynamic approach replaces fixed configurations with flexible, condition-based control, enabling the system to adjust HARQ behavior according to the specific technology and release in use without requiring complex technology-specific configurations.
Data Source
AI summary
A method can include receiving, by a wireless device, radio resource control (RRC) messages that include parameters of a multicast and broadcast service (MBS). The parameters can include a discontinuous reception (DRX) hybrid automatic repeat request (HARQ) round trip time (RTT) timer; a DRX retransmission timer; and a feedback indicator indicating whether HARQ feedback is enabled. The method can also include receiving a group common downlink control information (DCI) scheduling a transport block (TB) of the MBS. The method can further include, in response to the feedback indicator indicating that HARQ feedback is enabled: transmitting a HARQ feedback with a negative value based on the TB being unsuccessfully decoded; and starting the DRX HARQ RTT timer after transmitting the HARQ feedback. The method can additionally include starting the DRX retransmission timer based on an expiry of the DRX HARQ RTT timer.