RLC Network Coding for Multicast Retransmission Latency
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in multicast/broadcast transmissions due to suboptimal use of network coding in the radio link control (RLC) layer, leading to increased latency and resource utilization.
Innovation Solution
Implementing network coding in the RLC layer for both initial and retransmission phases of multicast/broadcast services, enabling encoded packet transmission and feedback mechanisms to enhance data delivery efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If network coding is not implemented in RLC layer for multicast/broadcast transmissions, then system complexity remains low, but data delivery efficiency and latency performance deteriorate
Solution Approach 1:
The patent segments the multicast/broadcast transmission process into distinct phases (initial transmission and retransmission phases) with different network coding configurations. Configuration information is segmented to indicate separate enabling states for initial transmissions and retransmissions, allowing optimized control of coding operations in each phase without requiring full-system complexity
Solution Approach 2:
The patent changes the parameter of network coding enablement dynamically based on transmission phase. Configuration information includes separate indicators for enabling network coding in initial transmissions versus retransmissions, allowing the system to adapt coding operations to specific operational contexts and improve data delivery efficiency without permanently increasing system complexity
2Loss of time
If network coding is enabled for retransmissions in multicast/broadcast services, then latency is reduced, but resource utilization increases
Solution Approach 1:
The patent implements dynamic control of network coding operations based on transmission phase and receiver feedback. The base station receives RLC status feedback messages indicating decoding status and dynamically decides whether to apply network coding in retransmissions. This dynamic approach reduces latency when coding benefits performance while avoiding unnecessary resource utilization when feedback indicates successful reception
Solution Approach 2:
The patent introduces feedback mechanisms where receivers send RLC status feedback messages to the base station indicating whether initial transmissions were successfully decoded. This feedback enables the base station to make informed decisions about applying network coding in retransmissions, reducing latency only when needed based on actual reception status rather than uniformly increasing resource utilization
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, configuration information indicating that network coding is enabled for initial transmissions associated with a multicast/broadcast service (MBS) and indicating that network coding is enabled for retransmissions associated with the MBS. The UE may receive, via a multicast traffic channel or a dedicated traffic channel, an initial transmission associated with the MBS, wherein the initial transmission is associated with a first set of encoded packets. The UE may transmit a radio link control (RLC) status feedback message associated with the initial transmission. The UE may receive, via the multicast traffic channel or the dedicated traffic channel, a retransmission associated with the initial transmission, wherein the retransmission is associated with a second set of encoded packets. Numerous other aspects are described.