Polar Code Rate Selection for 5G Control Channel Payloads
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently encoding and decoding information on control channels due to the limitations of using a single baseline code rate for polar codes, which fails to handle various payload and aggregation level combinations effectively.
Innovation Solution
The method involves selecting a code rate from a set of baseline code rates based on downlink control channel aggregation size, uplink control channel assignment, or payload size for encoding and decoding using polar codes, allowing for more efficient resource utilization and balancing coding gain 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 encoding and decoding process is simple, but it fails to handle various payload and aggregation level combinations effectively
Solution Approach 1:
The patent implements dynamic code rate selection where the code rate is adapted based on channel conditions, payload size, and aggregation level. The system transitions from a static single code rate to a dynamic selection mechanism that chooses from multiple baseline code rates (1/2, 2/3, 3/4, 4/5) depending on the specific transmission requirements, thereby improving adaptability while managing complexity through structured selection criteria.
Solution Approach 2:
The patent changes the code rate parameter based on different transmission scenarios. By defining multiple baseline code rates and selecting appropriate ones based on payload size and aggregation level, the system optimizes the coding parameter to match channel conditions and resource allocation, resolving the contradiction between versatility and complexity.
2Productivity
If code rates are selected based on downlink control channel aggregation size and payload size, then communication efficiency is improved, but the decoding complexity increases
Solution Approach 1:
The patent performs preliminary code rate selection based on pre-defined baseline code rates and selection criteria. By determining the appropriate code rate before encoding and transmission, the system enables the receiver to use the same pre-determined code rate for decoding, avoiding the need for complex real-time code rate determination at the receiver and thus managing decoding complexity while improving communication efficiency.
Solution Approach 2:
The system uses feedback mechanisms where the transmitter selects code rates based on channel conditions and transmission parameters, and this selection information is communicated to the receiver. This feedback enables the receiver to configure its decoder appropriately, achieving high communication efficiency without excessive decoding complexity through coordinated code rate selection.
Data Source
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.