Polar Code Rate Selection Across 5G Control Channel Aggregation Levels
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently handling various payload and aggregation level combinations using a single baseline code rate for polar codes, which affects the transmission of encoded information on control channels.
Innovation Solution
The technique involves selecting a code rate from a set of baseline code rates based on the control channel aggregation level and payload size for encoding information using polar codes, allowing for dynamic adjustment to optimize resource use and decoding complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single baseline code rate is used for polar codes, then the system structure is simple, but it cannot efficiently handle various payload and aggregation level combinations
Solution Approach 1:
The patent implements dynamic code rate selection where the baseline code rate is adjusted based on control channel aggregation level and payload size. The system transitions from a static single code rate to a dynamic multi-code rate system that adapts to different transmission conditions, resolving the contradiction between adaptability and complexity by making the code rate a variable parameter rather than a fixed value.
Solution Approach 2:
The patent changes the parameter of code rate from a single fixed value to multiple selectable values based on aggregation level and payload size. By introducing parameter-based code rate selection, the system achieves better adaptability to different transmission scenarios while maintaining a structured approach to managing the increased complexity through defined selection criteria.
2Reliability
If code rate is increased to improve coding gain, then transmission reliability improves, but decoding complexity increases
Solution Approach 1:
The patent utilizes code rate as a controllable parameter that can be adjusted based on transmission requirements. By selecting appropriate code rates from multiple baseline options, the system optimizes the balance between coding gain (and thus reliability) and decoding complexity, allowing higher code rates to be used when reliability is critical and lower code rates when complexity needs to be reduced.
Solution Approach 2:
The system dynamically adjusts the code rate based on real-time conditions including aggregation level and payload size. This dynamic adjustment allows the system to increase coding gain when needed while avoiding unnecessary decoding complexity in scenarios where lower code rates are sufficient, effectively managing the trade-off between reliability and complexity.
3Productivity
If resource allocation is optimized for specific payload sizes, then transmission efficiency improves, but system flexibility decreases
Solution Approach 1:
The patent creates a universal code rate selection mechanism that works across multiple payload sizes and aggregation levels. The same selection framework and baseline code rates can handle diverse transmission scenarios, making the system both efficient (through optimized code rate selection) and flexible (through broad applicability to different payload and aggregation level combinations).
Solution Approach 2:
The system dynamically selects code rates based on the specific combination of payload size and aggregation level, allowing optimal resource allocation for each scenario while maintaining the ability to adapt to any payload size. This dynamic approach ensures transmission efficiency for specific cases without sacrificing overall system flexibility.
Data Source
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AI summary
Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to methods and apparatus for code rate selection for control channels. An exemplary method generally includes selecting, from a set of code rates, a code rate to be used to encode a stream of bits using a polar code, based on at least one of a downlink control channel aggregation size, an uplink control channel assignment, or a payload size of the stream of bits, encoding the stream of bits using the polar code and the selected code rate, and transmitting the encoded stream of bits.