Semi-Persistent Rate-Splitting Scheduling to Reduce Signaling Overhead
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Solution Overview
Problem
Existing wireless communication systems face significant signaling overhead due to frequent rate-splitting downlink occasions, which can be inefficient and costly in terms of resource utilization.
Innovation Solution
Implementing a semi-persistent scheduled (SPS) rate-splitting configuration that reduces signaling overhead by notifying user equipment (UEs) of expected downlink occasions for rate-split messages, allowing them to decode messages appropriately, and supporting both flexible and non-flexible slots for communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequent rate-splitting downlink occasions are implemented, then channel capacity and communication efficiency are improved, but signaling overhead increases significantly
Solution Approach 1:
The network entity pre-configures SPS rate-splitting parameters including downlink occasion periods, encoding schemes, and resource allocations before actual transmissions. UEs are notified of expected downlink occasions in advance, allowing them to prepare decoding operations and reduce the need for frequent dynamic control signaling.
Solution Approach 2:
Downlink occasions are scheduled periodically according to pre-configured SPS parameters rather than being dynamically assigned each time. This periodic structure allows UEs to anticipate transmission times and reduces the frequency of control information transmissions while maintaining efficient resource utilization.
2Adaptability or versatility
If dynamic scheduling control information is transmitted for each downlink occasion, then communication flexibility is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
Control information is segmented into two parts: (1) SPS configuration parameters transmitted once or periodically containing encoding information, downlink occasion patterns, and resource allocations; (2) Minimal dynamic indicators transmitted only when actual changes are needed. This segmentation reduces overall signaling overhead while preserving necessary flexibility.
Solution Approach 2:
The system transitions from purely dynamic scheduling parameters to semi-persistent parameters with predefined characteristics. SPS configuration establishes fixed patterns for downlink occasions, encoding schemes, and resource allocations, reducing the need for frequent parameter updates while maintaining adaptability through selective reconfiguration.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, the proposed techniques provide for a semi-persistent design for communicating rate-split messages from a network entity to multiple user equipments (UEs). The network entity may transmit control information to one or more UEs indicating encoding information for receipt of one or more downlink messages to be communicated during respective downlink occasions, which may be configured for rate-split communications. Thus, a first UE may be made aware of one or more semi-persistent downlink occasions via which respective downlink messages (e.g., respective to each downlink occasion) are to be encoded into a common portion and a private portion. In some cases, the common portion may be common with other downlink messages (e.g., intended for other UEs) and the private portion may be specific to the first UE. The first UE may then decode the rate-split downlink messages according to the encoding information.