Multi-SIM Control Channel Decoding With Dynamic SCL-BP Selection
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Solution Overview
Problem
Conventional User Equipments (UEs) supporting multiple Subscriber Identity Modules (multi-SIMs) face inefficiencies in decoding control channels due to high power and space consumption, as well as idle usage of Belief Propagation (BP) decoders during control channel decoding.
Innovation Solution
The method involves selecting a decoder for each SIM of the multi-SIMs, either a Successive Cancellation List (SCL) decoder or a BP decoder, based on channel quality metrics, Log-Likelihood Ratios (LLRs), and Mean Mutual Information per Bit (MMIB), to efficiently decode control channels and mitigate collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple duplicate SCL decoders are used for decoding control channels on multi-SIMs, then decoding collision is avoided, but space consumption and power consumption increase
Solution Approach 1:
The patent implements dynamic decoder selection where the system switches between SCL decoder and BP decoder based on real-time channel conditions. When channel quality is good, the BP decoder is used for lower power consumption; when channel quality degrades, the SCL decoder is activated to maintain decoding reliability. This dynamic adaptation resolves the contradiction by not permanently allocating multiple SCL decoders but rather selecting the appropriate decoder type based on actual needs.
Solution Approach 2:
The system changes the operational parameters of the decoder selection based on channel quality metrics such as SINR and BLER. By monitoring these parameters, the system determines whether to use the power-efficient BP decoder or the more reliable SCL decoder. This parameter-based decision-making allows the system to maintain reliability only when necessary, thereby reducing overall power consumption compared to always using multiple SCL decoders.
2Reliability
If SCL decoder is used for decoding control channel, then decoding accuracy is maintained, but area/space consumption increases
Solution Approach 1:
The patent makes the BP decoder multi-functional by enabling it to decode both data channels and control channels under certain conditions. Normally, the BP decoder is dedicated to data channel decoding while SCL handles control channels. However, the patent extends the BP decoder's functionality to also handle control channel decoding when channel conditions permit, thereby reducing the need for dedicated SCL decoder hardware and reducing overall area consumption.
Solution Approach 2:
The system dynamically assigns control channel decoding tasks between SCL and BP decoders based on channel conditions. When channel quality is sufficient, the BP decoder takes over control channel decoding, freeing up SCL decoder resources and reducing the effective area needed for control channel processing. This dynamic task allocation resolves the area consumption issue while maintaining decoding accuracy when needed.
3Area of stationary object
If time multiplexed SCL decoder is used for multi-SIMs, then space consumption is reduced, but decoding time increases
Solution Approach 1:
The patent introduces dynamic decoder assignment where the BP decoder is activated for control channel decoding on certain SIMs when channel conditions are favorable, rather than strictly time-multiplexing a single SCL decoder across all SIMs. This dynamic parallel processing capability reduces the total decoding time compared to sequential time-multiplexed processing, while still maintaining space efficiency by using a single BP decoder instance that can be dynamically allocated.
4Use of energy by moving object
If BP decoder is used for decoding control channel, then power consumption is reduced, but decoding performance may deteriorate
Solution Approach 1:
The system monitors channel quality parameters such as SINR and BLER to determine when to use the BP decoder for control channel decoding. When these parameters indicate good channel conditions, the BP decoder is selected to reduce power consumption. When parameters degrade, the system switches to the SCL decoder to maintain decoding performance. This parameter-driven selection strategy ensures that the BP decoder is only used when it can maintain acceptable performance, thus resolving the contradiction between power savings and performance.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors decoding performance metrics and channel conditions. Based on this feedback, the system dynamically adjusts which decoder type is used for control channel decoding. If the BP decoder begins to show performance degradation, the feedback loop triggers a switch to the SCL decoder, ensuring that power consumption is minimized only as long as performance requirements are met.
Data Source
AI summary
Methods and systems for managing decoding of control channel on a multi-SIM UE. A method includes receiving, by the UE, the plurality of control channels from at least one Base Station (BS), the plurality of control channels corresponding to a plurality of Subscriber Identity Modules (SIMs), selecting, by the UE, a respective decoder for each of the plurality of SIMs, and decoding, by the UE, each respective control channel among the plurality of control channels using the respective decoder for a respective SIM among the plurality of SIMs, the respective SIM corresponding to the respective control channel.