Polar Code Scheme Selection by Receiver Decoding Capability
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Solution Overview
Problem
Existing wireless communication systems face challenges in selecting optimal polar code schemes based on the receiver's decoding capability, which affects the performance of polar codes in multiple-access communications.
Innovation Solution
A method and system where a user equipment (UE) indicates its polar decoding capability to the network entity, allowing the network entity to select and indicate a polar coding scheme based on the UE's decoder capability, ensuring optimal performance of polar codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed polar code scheme is used regardless of receiver capability, then device complexity is reduced, but communication reliability deteriorates
Solution Approach 1:
The patent implements dynamic polar code scheme selection based on receiver decoding capability. The network entity adapts the coding scheme according to the UE's indicated capability (SC, SCL, or ML decoder), transforming a static fixed scheme into a dynamic adaptive system that optimizes reliability for each receiver type.
Solution Approach 2:
The patent changes the parameter of code freezing pattern based on receiver capability. Different freezing patterns (first pattern for SC decoders, second pattern for SCL/ML decoders) are selected by changing the code scheme parameter according to the receiver's decoding capability, thereby optimizing performance for each decoder type.
2Reliability
If polar code scheme is selected based on receiver decoding capability, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by having the UE indicate its decoding capability to the network entity before actual data transmission. This advance indication allows the network entity to pre-select the appropriate polar code scheme, avoiding complex real-time decisions during transmission and reducing operational complexity.
Solution Approach 2:
The patent introduces capability indication messages as an intermediary mechanism between the UE and network entity. This intermediary information exchange enables the network to select appropriate coding schemes without requiring complex real-time analysis of receiver capabilities during data transmission.
3Reliability
If different freezing patterns are used for different decoders, then polar code performance is optimized, but ease of operation deteriorates
Solution Approach 1:
The patent systematically changes the code freezing pattern parameter based on decoder type. SC decoders use a first freezing pattern while SCL and ML decoders use a second freezing pattern. This parameter change approach maintains clear operational rules while optimizing performance for each decoder type.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In polar coding, some bits channels have a higher reliability and other bit channels have a lower reliability. Data may be transmitted on some of the bit channels, and frozen values known to both the receiver and transmitter may be transmitted on the remaining bit channels. The performance of different polar code schemes (e.g., which bit channels are frozen) may depend on the decoder the receiving device uses. A receiving device (e.g., a user equipment for downlink transmissions) may indicate a decoder or polar decoding capability to the transmitting device (e.g., the network entity for downlink transmissions), and the transmitting device may select and indicate to the receiving device a polar coding scheme based on the indicated decoder or decoding capability. The transmitting device may transmit a communication to the receiving device encoded in accordance with the indicated polar coding scheme.