Soft Buffer Status Reporting for Wireless Communication Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately reporting soft buffer status, leading to mismatches between user equipment (UE) and network entity estimates, which can result in inefficient retransmissions and communication failures.
Innovation Solution
The proposed solution involves a method and system where a UE performs decoding operations on downlink messages, stores decoding information in a buffer if the operation is unsuccessful, and transmits a report indicating buffer usage information to the network entity. This report includes parameters such as transport blocks and time instances for purging operations, allowing the network entity to align its estimates with the UE's buffer status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE stores decoding information in the buffer for unsuccessful decoding operations, then the reliability of retransmissions is improved, but the buffer usage information may become outdated or mismatched with network entity estimates
Solution Approach 1:
The UE transmits buffer status reports to the network entity, providing feedback on the actual buffer usage. This feedback mechanism allows the network entity to align its estimates with the UE's buffer status, resolving the mismatch between stored decoding information and network estimates.
Solution Approach 2:
The network entity is provided with information about time instances for purging operations before these operations occur. This allows the network entity to proactively update its buffer status estimates and avoid relying on outdated information when scheduling retransmissions.
2Measurement precision
If the UE transmits buffer status reports frequently to maintain accurate buffer status information, then the measurement precision is improved, but the use of energy and communication resources increases
Solution Approach 1:
Buffer status reports are transmitted periodically or at specific time instances rather than continuously. This periodic reporting mechanism maintains adequate buffer status information accuracy while reducing the frequency of transmissions and associated energy consumption.
Solution Approach 2:
The UE transmits buffer status information at selective time instances rather than continuously. This partial action approach provides sufficient information for network entity estimates without the excessive energy consumption of continuous reporting.
3Measurement precision
If the network entity maintains detailed tracking of UE buffer contents, then the measurement precision is improved, but the device complexity of the network entity increases
Solution Approach 1:
The complex task of tracking buffer contents is extracted from the network entity and performed by the UE itself. The UE determines its own buffer status and transmits this information to the network entity, which then uses this provided information for scheduling decisions without needing to maintain complex tracking mechanisms.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may perform a decoding operation on a downlink message for the UE. The UE may store, in a buffer of the UE, decoding information associated with the decoding operation on the downlink message based at least in part on the decoding operation on the downlink message being at least partially unsuccessful. In some examples, the UE may transmit, to a network entity, a report indicating buffer usage information of the buffer of the UE, where the buffer usage information indicates one or more parameters associated with the decoding information stored in the buffer of the UE. In some cases, the buffer usage information may indicate one or more transport blocks for which entries are present in the buffer of the UE.