RLC Error Recovery with Low Latency Transmissions
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Solution Overview
Problem
Current RLC error recovery processes in wireless communication systems introduce latency, making them unsuitable for low latency operations, as they require time for reordering timers to expire and status reports to be sent, leading to delays in retransmissions.
Innovation Solution
Implementing fast error recovery procedures that include detecting transmission errors, initiating timers for failed transmissions, and generating failure reports to expedite retransmissions, thereby reducing latency in RLC data packet recovery during low latency operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RLC error recovery procedures are used with reordering timers and status reports, then transmission reliability is improved, but transmission latency increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple HARQ processes and maintaining them in a ready state before errors occur. When a transmission error is detected, the system can immediately activate a standby HARQ process for retransmission without waiting for traditional RLC reordering timers to expire, thus resolving the contradiction between maintaining reliability through error recovery and reducing latency by eliminating timer waiting periods
Solution Approach 2:
The patent introduces an intermediary mechanism by using multiple HARQ processes as intermediate retransmission channels. Instead of relying on the traditional sequential RLC status report and retransmission process, the system uses pre-established HARQ processes as intermediaries that can immediately handle retransmissions, thereby maintaining error recovery reliability while significantly reducing the time delay
2Reliability
If reordering timers are used to ensure in-order packet delivery, then packet ordering reliability is improved, but overall transmission speed decreases
Solution Approach 1:
The patent applies segmentation by dividing the error recovery function into separate HARQ processes that operate independently. Each HARQ process can handle retransmissions autonomously without requiring centralized RLC control and reordering timer coordination, allowing parallel processing of multiple packets and eliminating the speed bottleneck caused by sequential timer-based ordering verification
Data Source
AI summary
Methods, systems, and devices for communication are described. Fast error recovery procedures may be employed that decrease latency for radio link control (RLC) data packet recovery during low latency operations. A device may detect a failed low latency transmission, and may activate a timer associated with the failed transmission. The device may generate a failure report if failed transmissions are not rescheduled; for example, if the timer expires before rescheduling. The failure report may be sent to an RLC entity of the device or to a medium access control (MAC) layer entity of the scheduler. In some cases, the device may maintain a list of non-terminated transmissions for high priority bearers.