MAC CE Bearer Mapping for NR Repeat Transmission Control
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Solution Overview
Problem
In the 5G New Radio (NR) system, different network nodes transmitting conflicting activation/deactivation retransmission MAC CEs leads to erroneous operations at the user equipment (UE), as current mechanisms lack coordination between network nodes for managing retransmission bearers.
Innovation Solution
A method where base stations configure a correspondence relationship between bearers allowed for retransmission and bits in the MAC CE, ensuring only valid retransmission indications are made for local bearers, and the UE parses these indications correctly to avoid misunderstandings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeat transmission is continuously performed to ensure reliable data delivery, then reliability is improved, but power consumption increases and battery life decreases
Solution Approach 1:
The patent implements dynamic adjustment of repeat transmission parameters based on channel conditions. The base station configures different repeat transmission modes (e.g., adaptive repeat, selective repeat) and the terminal adapts its transmission behavior according to received signal quality feedback, transitioning between active transmission and idle states to optimize power consumption while maintaining reliability.
Solution Approach 2:
The system changes transmission parameters such as repeat transmission count, time interval between repeats, and transmission power dynamically. The base station configures parameters like maximum repeat count and time window, while the terminal adjusts actual transmission based on channel quality metrics, thereby balancing reliability requirements with power consumption constraints.
2Reliability
If repeat transmission is activated to improve communication reliability in poor channel conditions, then reliability is improved, but device complexity increases due to additional configuration and control mechanisms
Solution Approach 1:
The patent integrates repeat transmission functionality into the existing uplink scheduling framework. The same physical uplink shared channel (PUSCH) resources are reused for both initial transmission and repeat transmission, and the control signaling leverages existing downlink control information (DCI) formats. This multi-functional approach avoids creating separate complex control mechanisms while achieving reliable communication.
Solution Approach 2:
The base station acts as an intermediary that configures repeat transmission parameters through standardized RRC signaling and DCI formats. Rather than requiring complex terminal-side autonomous decisions, the base station mediates the control process by providing configuration parameters (e.g., repeat count, time window, resource allocation) that simplify terminal implementation while maintaining system-wide optimization.
3Reliability
If repeat transmission uses dedicated resources to ensure reliable delivery, then reliability is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent merges repeat transmission resources with normal uplink data transmission resources. The base station allocates PUSCH resources that can serve both initial transmission and repeat transmission purposes. When repeat transmission is configured, the same or overlapping time-frequency resources are reused, eliminating the need for separate dedicated repeat resources and improving overall resource utilization efficiency.
Solution Approach 2:
The system allocates resources with partial redundancy in mind. The base station configures maximum repeat count and time window parameters that define potential resource usage, but actual resource consumption depends on channel conditions. This allows the system to prepare for reliable transmission while only consuming additional resources when necessary, thereby improving average resource utilization efficiency.
Data Source
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AI summary
The present disclosure provides a retransmission activating/deactivating method, a base station, a user equipment and a device. The method includes: determining a correspondence relationship between a bearer which is allowed for retransmission under the first base station and a bit of a preset field of media access control (MAC) control element (CE) of the first base station for activating/deactivating retransmission; where the preset field is used to indicate activation/deactivation retransmission of the bearer which is allowed for retransmission; and, when determining to activate/deactivate retransmission of the bearer which is allowed for retransmission under the first base station, populating, by the first base station, the bit, which is in the preset field of the MAC CE for activating/deactivating retransmission and corresponding to the bearer, thereby generating the MAC CE for activating/deactivating retransmission, and transmitting to the UE the generated MAC CE for activating/deactivating retransmission.