Dynamic NDDS Resource Selection in 5G NR SRS Carrier Switching
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Solution Overview
Problem
In multi-subscriber identity module (MultiSim) devices, the use of non-default data subscriptions (nDDS) for wireless communication systems leads to resource conflicts with default data subscriptions (DDS), resulting in reduced downlink throughput due to time-domain conflicts between sounding reference signals (SRS) and discontinuous reception (DRX) cycles, which affects overall communication performance.
Innovation Solution
The method involves dynamically selecting resources for nDDS reception based on characteristics such as carrier type, rank, and hardware capabilities to avoid conflicts, prioritizing carriers that contribute less to downlink throughput and searching for alternative cells if necessary, thereby mitigating the impact on default data subscription performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resources are shared between DDS and nDDS, then device complexity is reduced, but downlink throughput is reduced due to resource conflicts
Solution Approach 1:
The patent implements dynamic resource selection where the UE can switch between different resources (first resource for DDS, second resource for nDDS) based on real-time conditions. The dynamic switching mechanism allows the system to adapt resource allocation to avoid conflicts between SRS antenna switching and DRX cycles, thereby maintaining downlink throughput while sharing resources between DDS and nDDS.
Solution Approach 2:
The patent changes the parameter of resource selection by introducing dynamic criteria based on carrier characteristics, SRS switching status, and DRX cycle timing. Instead of static resource assignment, the system evaluates multiple parameters (carrier type, antenna switching state, DRX timing) to dynamically determine which resource to use for nDDS reception, resolving the throughput degradation caused by resource conflicts.
2Device complexity
If static resource selection is used for nDDS, then device complexity is reduced, but SRS conflicts occur reducing communication efficiency
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors the timing relationship between SRS antenna switching and DRX cycles, and based on this feedback information, dynamically selects resources to avoid conflicts. The system uses feedback about SRS switching status and DRX timing to make informed resource selection decisions, preventing SRS conflicts and maintaining communication efficiency.
Solution Approach 2:
The patent performs preliminary evaluation of resource availability by checking carrier characteristics and SRS switching status before selecting resources for nDDS reception. This preliminary action prevents SRS conflicts by identifying suitable resources in advance that do not overlap with SRS antenna switching periods, thereby maintaining communication efficiency without requiring complex real-time conflict resolution.
3Productivity
If dynamic resource selection is implemented, then downlink throughput is preserved, but device complexity increases
Solution Approach 1:
The patent segments the resource selection process into distinct evaluation steps: first evaluating carrier characteristics, then checking SRS switching status, then assessing DRX cycle timing, and finally selecting the appropriate resource. This segmentation of the decision-making process into manageable stages reduces the perceived complexity by breaking down the dynamic selection into systematic, sequential evaluations while still achieving throughput preservation.
4Reliability
If resources are allocated to avoid SRS conflicts, then communication efficiency is improved, but resource utilization flexibility is reduced
Solution Approach 1:
The patent makes the resource selection mechanism universal by applying the same dynamic selection criteria across different carrier types and scenarios. The evaluation framework (checking carrier characteristics, SRS status, DRX timing) can be universally applied regardless of specific network conditions, allowing the system to maintain communication efficiency while adapting flexibly to various resource allocation scenarios and carrier configurations.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) is configured such that sounding reference signal (SRS) is switched among a number of antennas on a number of carriers associated with a default data subscription (DDS). The UE is also configured to receive a signal, scheduled using discontinuous reception (DRX), and associated with a non-default data subscription using at least one of the antennas used by the DDS. The UE determines based on carrier characteristics which resource is used to receive the signal during a DRX cycle. In some aspects, the decision is based on avoiding a conflict between the SRS switching and DRX reception. In further aspects, the decision is based on selecting the carrier contributing least to downlink throughput.