Rateless PDCCH Decoding for Lower Latency and Power
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in decoding physical channels due to the reliance on channel state information (CSI) measurements and reports, leading to increased latency, processing load, and power consumption.
Innovation Solution
Implementing rateless coding schemes with an initial state or seed value configured to a device identifier, allowing early termination of decoding attempts based on a decoding metric threshold, reducing unnecessary decoding of signals not intended for the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind decoding is performed on all physical channel candidates in a search space, then the probability of successfully decoding the intended message is improved, but the processing load and power consumption increase significantly
Solution Approach 1:
The patent applies preliminary action by performing a preliminary check using a decoding metric threshold before completing full blind decoding. The UE calculates a decoding metric for each physical channel candidate and compares it against a threshold to determine whether to proceed with full decoding or terminate early, thus reducing processing load while maintaining decoding success probability.
2Reliability
If blind decoding is performed on all physical channel candidates in a search space, then the probability of successfully decoding the intended message is improved, but the latency increases
Solution Approach 1:
The patent applies preliminary action by performing a preliminary check using a decoding metric threshold before completing full blind decoding. The UE calculates a decoding metric for each physical channel candidate and compares it against a threshold to determine whether to proceed with full decoding or terminate early, thus reducing processing load while maintaining decoding success probability.
Solution Approach 2:
The patent applies skipping by allowing the UE to skip unnecessary full decoding operations for physical channel candidates that fail the initial decoding metric threshold check. This enables the UE to rush through the search space more quickly by terminating decoding attempts early for non-promising candidates, thereby reducing overall decoding latency.
3Reliability
If blind decoding is performed on all physical channel candidates in a search space, then the probability of successfully decoding the intended message is improved, but the power consumption increases
Solution Approach 1:
The patent applies preliminary action by performing a preliminary check using a decoding metric threshold before completing full blind decoding. The UE calculates a decoding metric for each physical channel candidate and compares it against a threshold to determine whether to proceed with full decoding or terminate early, thus reducing processing load while maintaining decoding success probability.
Solution Approach 2:
The patent applies skipping by allowing the UE to skip unnecessary full decoding operations for physical channel candidates that fail the initial decoding metric threshold check. This enables the UE to rush through the search space more quickly by terminating decoding attempts early for non-promising candidates, thereby reducing overall decoding latency.
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for early termination of decoding attempts, including decoding attempts associated with physical downlink control channel (PDCCH) candidates that are encoded using a rateless code. In some aspects, a transmitting device may encode a message using a rateless code associated with a cumulative encoding of various portions of the message, and using a device identifier or group identifier as an input to the encoding. Similarly, a receiving device may receive an encoded signal over candidate resources and may attempt to decode the signal in accordance with the rateless code and using a device identifier or a group identifier as an input to the decoding. As such, intended or non-intended receiving device may be able to evaluate whether to proceed with a decoding attempt or to terminate a decoding attempt at a relatively early stage.