Multi-SIM Control Channel Decoding Using SCL-BP Decoder Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional User Equipment (UE) supporting multiple Subscriber Identity Modules (multi-SIMs) face inefficiencies in decoding control channels due to high power consumption and space usage, whether using a single SCL decoder in a time-multiplexed manner or multiple duplicate SCL decoders, which leads to decoding delays and resource wastage.
Innovation Solution
The UE selectively chooses between a Successive Cancellation List (SCL) decoder and a Belief Propagation (BP) decoder for each SIM based on channel quality metrics, Log-Likelihood Ratios (LLRs), and Mean Mutual Information per Bit (MMIB) to optimize decoding, allowing simultaneous or contemporaneous decoding of control channels using both decoders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single SCL decoder is used in a time-multiplexed manner for multiple SIMs, then space and cost are conserved, but decoding time increases and decoding delays occur
Solution Approach 1:
The patent segments the decoder functionality by separating the SCL decoder (for control channels) and BP decoder (for data channels) into independent units. This allows the BP decoder to be utilized for control channel decoding when the SCL decoder is occupied, effectively dividing the decoding workload between two specialized decoders rather than time-multiplexing a single decoder.
2Productivity
If multiple duplicate SCL decoders are used for multiple SIMs, then decoding collisions are avoided, but power consumption and space increase
Solution Approach 1:
The patent makes the BP decoder multi-functional by enabling it to decode both data channels (its traditional function) and control channels (when the SCL decoder is busy). This universality allows the system to handle multiple SIMs simultaneously without duplicating the SCL decoder, thereby reducing power consumption while maintaining decoding throughput.
3Productivity
If multiple duplicate SCL decoders are used for multiple SIMs, then decoding collisions are avoided, but space and device complexity increase
Solution Approach 1:
Instead of copying the complex SCL decoder multiple times, the patent uses a simpler BP decoder as an alternative decoding engine. The BP decoder serves as a copy or substitute that can handle control channel decoding when needed, reducing overall device complexity while maintaining the capability to simultaneously decode control channels for multiple SIMs.
4Reliability
If the SCL decoder is used for control channel decoding, then accurate decoding is achieved, but the BP decoder becomes idle and resources are wasted
Solution Approach 1:
The patent ensures continuous useful action by assigning the BP decoder to decode control channels when the SCL decoder is occupied with other tasks. This eliminates idle time for the BP decoder and ensures both decoders are continuously utilized for productive work, thereby eliminating resource wastage while maintaining decoding accuracy through the use of appropriate decoders for their respective tasks.
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.