DSDS RF Resource Retention for PDU Reception
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Solution Overview
Problem
Dual Sim Dual Standby (DSDS) devices face performance degradation due to RF resource tuning away issues, leading to missed packet data units and delayed or failed page messages, which affect user experience and network synchronization.
Innovation Solution
Implementing methods to improve Paging Type2 performance by initiating timers to block RF tune away, retaining RF resources, and triggering cell search procedures based on SIR monitoring and retransmission attempts to ensure timely reception and transmission of PDUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RF resource is tuned away to another SIM for paging or measurements, then the device can monitor multiple subscriptions, but packet data units may be missed and layer-2 recovery becomes ineffective
Solution Approach 1:
The patent applies preliminary action by initiating a timer before the RF tune-away occurs. This timer blocks subsequent RF tune-aways for a predetermined duration, ensuring that the RF resource remains dedicated to the first SIM long enough to receive and process the PDU, thereby preventing PDU loss while still allowing the device to monitor multiple subscriptions.
Solution Approach 2:
The patent implements dynamics by making the RF resource allocation dynamic through the timer mechanism. The RF resource is not permanently dedicated to one SIM but is dynamically retained for the first SIM only when needed for PDU reception, as determined by the timer status. This allows flexible switching between SIMs based on real-time communication needs.
2Reliability
If RF resource is dedicated to one SIM for ongoing PS session, then data transmission is stable, but paging messages from the other SIM may be missed
Solution Approach 1:
The patent uses feedback through the timer mechanism to control RF resource allocation. When a PDU is transmitted or a status PDU is sent, a timer is initiated that provides feedback by blocking further RF tune-aways. This feedback loop ensures that the RF resource remains with the first SIM until the communication transaction is complete, preventing both data loss and unnecessary paging delays.
Solution Approach 2:
The patent applies periodic action through the timer-based control mechanism. The RF resource is periodically reallocated to the first SIM based on the timer expiration, creating a rhythmic pattern of resource dedication that balances stable data transmission with the ability to respond to paging messages from the other SIM when the timer allows.
3Manufacturing precision
If layer-2 recovery procedure is initiated for missed SN, then PDU sequence completeness is restored, but the procedure stalls if RF is not tuned to the SIM for re-transmission
Solution Approach 1:
The patent applies preliminary action by proactively blocking RF tune-aways with a timer when a status PDU is transmitted. This prevents the scenario where the RF would tune away during the critical re-transmission window, thereby avoiding the need for complex stalled recovery procedures while still ensuring complete PDU sequences.
Solution Approach 2:
The timer acts as an intermediary mechanism between the layer-2 recovery procedure and the RF resource management. It mediates the conflict between needing to maintain RF dedication for re-transmission and the desire to tune away for other SIM activities, providing a simple time-based solution that eliminates the need for complex coordination protocols.
4Stability of the object's composition
If in-sequence delivery is configured as true, then PDU ordering is maintained, but paging type 2 PDUs are not forwarded to RRC even when received
Solution Approach 1:
The patent implements dynamics by making PDU forwarding dynamic based on timer status. When the timer is active (indicating an ongoing communication transaction), paging type 2 PDUs are blocked from forwarding to RRC. When the timer expires, forwarding is enabled. This dynamic control resolves the contradiction by temporarily sacrificing paging delivery for the duration of active data transactions, then restoring it when transactions are complete.
Data Source
AI summary
Some example embodiments disclose methods for improving Paging Type2 performance in Dual Sim Dual Standby (DSDS) devices, wherein the methods include transmitting a status Packet Data Unit (PDU) for a Signaling Radio Bearer (SRB) to a network; initiating a first timer in response to the transmitting the status PDU; blocking a radio frequency tune away to a first Subscriber Identity Module (SIM) if one or more missing PDUs are not received before expiry of the first timer; initiating a second timer in response to the blocking the RF tune away; and retaining, by a second SIM, radio frequency resources until expiry of the second timer or the one or more missing PDUs are received from the network.