Cellular WLAN Aggregation PDU Retransmission Logic
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Solution Overview
Problem
In wireless communication systems, LTE data transmission between user equipment (UE) and base stations via WLAN access points can result in unnecessary notifications and resource wastage due to connection failures, leading to a deadlock situation when the UE discards data due to limited buffer size and the base station fails to successfully transmit, causing repeated status reports.
Innovation Solution
A communication device configured to handle cellular network and WLAN aggregation, which includes a processing circuit to transmit messages indicating support for aggregation, receive configuration messages, and manage protocol data units (PDUs) by retransmitting or ignoring them based on availability in memory, thereby preventing unnecessary notifications and deadlocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the UE discards LTE data due to limited buffer size after successful transmission via WLAN, then the UE buffer management is efficient, but the BS cannot retransmit lost data and unnecessary notifications occur
Solution Approach 1:
The patent applies preliminary action by having the UE transmit a capability indication message to the BS before data transmission, informing the BS that the UE supports CWA and will discard data from its buffer after WLAN transmission. This allows the BS to anticipate potential data loss and implement appropriate retransmission strategies, preventing the deadlock situation where the BS repeatedly notifies the UE about lost data that the UE cannot retransmit.
2Reliability
If the BS repeatedly notifies the UE about lost LTE data, then the BS ensures data delivery, but LTE radio resources are wasted and a deadlock occurs
Solution Approach 1:
The patent implements feedback by having the UE provide capability information to the BS about its CWA support and data discarding behavior. The BS uses this feedback to adjust its retransmission strategy, stopping unnecessary notifications when the UE indicates it has already transmitted data via WLAN. This feedback mechanism prevents the deadlock of repeated notifications and optimizes radio resource usage.
3Productivity
If the UE transmits LTE data via WLAN to utilize aggregated resources, then transmission capacity increases, but connection failures cause data loss that the UE cannot recover
Solution Approach 1:
The patent applies preliminary action by having the UE inform the BS in advance about its CWA capability and data discarding policy. This allows the BS to prepare appropriate retransmission strategies before data loss occurs, rather than attempting to retransmit data that the UE has already discarded from its buffer, thereby maintaining both high transmission capacity and reliability.
Data Source
AI summary
A communication device of handling aggregation of cellular network and Wireless Local Area Network (WLAN) aggregation (CWA) comprises instructions of transmitting a message indicating support of the CWA to a base station (BS) via a cellular connection; receiving a configuration message configuring the CWA from the BS via the cellular connection; transmitting a cellular protocol data unit (PDU) to a WLAN configured by the configuration message via a WLAN connection; receiving a status report indicating that the cellular PDU is lost from the BS; transmitting the cellular PDU indicated by the status report, when the communication device has the cellular PDU in a memory device of the communication device; and transmitting a cellular message in response to the status report, when the communication device does not have the cellular PDU in the memory device.