Scheduling Channel Signal Redundancy Reduction in Wireless Systems
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Solution Overview
Problem
In wireless packet communication systems, UEs with different reception bandwidths face challenges in efficiently receiving scheduling channel signals, leading to decoding failures when they must demodulate signals from multiple 10-MHz bands, as existing methods transmit redundant information, which complicates the demodulation process and increases the required transmit power.
Innovation Solution
The method involves configuring scheduling channel signals differently based on the UE's reception bandwidth, dividing scheduling information into multiple types and mapping them to adjacent frequency bands with the minimum bandwidth, using a more robust channel coding scheme to avoid redundant information transmission, thereby simplifying the reception process for UEs with varying bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If scheduling channel signals are transmitted in multiple 10-MHz bands to support UEs with different reception bandwidths, then spectrum scalability is improved, but UE demodulation complexity and decoding failure rate increase due to redundant information
Solution Approach 1:
The patent extracts and removes redundant scheduling information from the SCCH signals transmitted in multiple 10-MHz bands. Specifically, when a UE is scheduled across multiple bands, the resource indication information (Cat. 1) is transmitted only in one band's SCCH, while other bands' SCCHs omit this redundant information. This extraction of unnecessary data reduces UE demodulation complexity while preserving spectrum scalability.
Solution Approach 2:
The patent segments scheduling information into different categories (Cat. 1 resource indication, Cat. 2 transport format, Cat. 3 HARQ) and selectively transmits them in different SCCH bands based on UE scheduling requirements. This segmentation allows the UE to efficiently process only necessary information from each band rather than demodulating redundant data from all bands.
2Loss of information
If redundant scheduling information is transmitted in multiple SCCH signals, then information completeness is improved, but detection performance deteriorates due to increased processing complexity
Solution Approach 1:
The patent removes redundant scheduling information from SCCH signals in bands where it is not necessary. For example, resource indication information is extracted and transmitted only in the primary SCCH band, eliminating redundant copies in other bands. This reduction in redundant information improves detection performance by reducing UE processing complexity while maintaining information completeness through selective transmission.
Solution Approach 2:
The patent dynamically adjusts the content of SCCH signals based on UE scheduling across different bands. When a UE is scheduled in multiple bands, the system dynamically omits redundant resource indication information from non-primary SCCHs. This dynamic adaptation optimizes detection performance by matching information transmission to actual UE needs in each scheduling instance.
3Adaptability or versatility
If UEs demodulate SCCH signals from multiple 10-MHz bands, then resource allocation coverage is improved, but required transmit power increases due to demodulation difficulty
Solution Approach 1:
The patent extracts redundant resource indication information from multiple SCCH bands, leaving only necessary information in each band. This reduction in SCCH information content simplifies UE demodulation across multiple bands, thereby reducing the transmit power required while maintaining full resource allocation coverage for UEs operating across different 10-MHz bands.
4Measurement precision
If channel coding is optimized for each SCCH band, then detection performance is improved, but system complexity increases due to multiple coding schemes
Solution Approach 1:
The patent applies parameter changes by selectively applying different channel coding schemes to different categories of scheduling information in different SCCH bands. Specifically, Cat. 1 information (resource indication) uses one coding scheme in primary bands, while Cat. 2 and Cat. 3 information uses appropriate coding schemes based on their importance and bandwidth requirements. This targeted parameter optimization improves detection performance without requiring all UEs to support every possible coding scheme, thus controlling system complexity.
Data Source
AI summary
A method and apparatus for transmitting/receiving scheduling channels in a wireless communication system supporting spectrum scalability are provided, in which scheduling bandwidth of a User Element (UE) is determined, scheduling information including index information indicating resources allocated to the UE, transport format information about data to be transmitted to the UE, and Hybrid Automatic Repeat reQuest (HARQ) information is configured if a scheduling bandwidth of the UE is equal to a system bandwidth, the scheduling information is divided into first scheduling information and second scheduling information, and each of the first scheduling information and the second scheduling information is mapped to scheduling resources corresponding to a frequency band adjacent to a center frequency of the system bandwidth and having a bandwidth equal to a minimum bandwidth of the UE, and transmitted to the UE.