LTE PDCCH Detection Reducing Computational Load
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Solution Overview
Problem
In LTE systems, detecting downlink control information (DCI) from a physical downlink control channel (PDCCH) allocated to a common space requires an excessive computational load due to the need to consider all possible combinations of PDCCH formats, RNTI types, and resource allocation regions, leading to lengthy test times.
Innovation Solution
A method that selects PDCCH formats, retrieves corresponding signals, performs decoding, and conducts cyclic redundancy check (CRC) tests without eliminating RNTI information, allowing for simultaneous testing of multiple RNTI combinations with a single CRC test, thereby reducing the number of required tests from 102 to 30.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all possible combinations of PDCCH formats, RNTI types, and resource allocation regions are tested to detect DCI, then detection accuracy is improved, but computational load and test time increase excessively
Solution Approach 1:
The patent segments the PDCCH detection process by separating common space PDCCH detection from UE-specific space PDCCH detection. For common space PDCCH, it tests only PDCCH formats 2 and 3 with multiple RNTI types, while UE-specific space PDCCH uses other formats. This segmentation reduces the total number of combinations to test from 102 to 30, significantly reducing computational load while maintaining detection accuracy.
Solution Approach 2:
The patent applies partial action by testing only the necessary PDCCH formats for common space (formats 2 and 3) rather than all possible formats. It also tests multiple RNTI types systematically but stops after finding a valid DCI, avoiding unnecessary exhaustive testing of all 102 combinations. This partial approach reduces computational effort while ensuring accurate detection.
2Measurement precision
If RNTI information is eliminated before CRC test, then CRC test accuracy is improved, but the number of tests required increases from 30 to 102
Solution Approach 1:
The patent performs preliminary action by systematically testing multiple RNTI types before the CRC test for common space PDCCH. It prepares the RNTI elimination step in advance for each RNTI type, allowing the CRC test to be performed efficiently without needing to re-test all combinations. This preliminary preparation reduces the overall number of tests from 102 to 30 while maintaining accuracy.
Solution Approach 2:
The patent changes the testing parameter approach by fixing the PDCCH format selection based on the common space identifier and only varying the RNTI type parameter. Instead of testing all combinations of formats, RNTI types, and resource allocations, it changes the parameter space to test only formats 2 and 3 with multiple RNTI types, reducing tests from 102 to 30 while preserving detection accuracy.
Data Source
AI summary
Disclosed herein is a method of detecting a physical downlink control channel (PDCCH) in a long-term evolution (LTE) system. In this method, one is selected from among possible PDCCH formats for received base station signals, and a signal corresponding to the length of the selected PDCCH format is retrieved. Thereafter, one is selected from among one or more of possible DCI formats that have not been selected yet. Thereafter, decoding is performed using the retrieved signal and the selected DCI format. Finally, a remainder is obtained by dividing the decoded signal by a cyclic redundancy check (CRC) pattern, and the remainder is stored as RNTI information, along with the selected DCI and the DCI format.