PDCCH Transmission for Bandwidth Aggregation
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Solution Overview
Problem
In the 3GPP LTE Advanced system, existing methods require LTE advanced terminals to decode multiple PDCCHs for bandwidth aggregation, increasing complexity and power consumption, while also necessitating modifications to the Downlink Control Information Format (DCI) to support legacy and advanced terminals.
Innovation Solution
The method involves transmitting PDCCH with resource allocation information for multiple sub-bands in a specific sub-band, using flags and indices to indicate resource allocation across bands, allowing terminals to decode only the necessary information without increasing decoding complexity, and supporting band-switching based on channel occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If resource allocation information for multiple sub-bands is transmitted in separate PDCCHs, then resource allocation coverage is complete, but terminal decoding complexity and power consumption increase
Solution Approach 1:
The patent merges resource allocation information for multiple sub-bands into a single PDCCH transmission. Specifically, it transmits resource allocation information for a first sub-band and a second sub-band in the same PDCCH of the first sub-band, allowing the terminal to decode only one PDCCH to obtain complete resource allocation information across both sub-bands, thereby reducing decoding complexity and power consumption while maintaining complete resource allocation coverage
Solution Approach 2:
The PDCCH in the first sub-band is designed to serve multiple functions: it carries resource allocation information for both the first sub-band and the second sub-band. This multi-functional design allows a single PDCCH transmission to provide complete resource allocation information for multiple sub-bands, eliminating the need for separate PDCCH transmissions and reducing the overall decoding burden on the terminal
2Adaptability or versatility
If DCI format is modified to support bandwidth aggregation, then bandwidth aggregation capability is enabled, but compatibility with legacy terminals may be affected
Solution Approach 1:
The patent applies local quality by making the DCI format adaptable to different terminal types. The base station transmits resource allocation information in a manner that advanced terminals can interpret for bandwidth aggregation, while legacy terminals can still process the same transmission using conventional methods. This allows the system to support bandwidth aggregation capability for advanced terminals without compromising compatibility with legacy terminals
3Loss of information
If terminal decodes all PDCCHs in aggregated bandwidths, then complete resource information is obtained, but power consumption increases
Solution Approach 1:
The patent extracts and consolidates resource allocation information for multiple sub-bands into a single PDCCH transmission. By taking out the resource allocation information for the second sub-band and placing it in the same PDCCH as the first sub-band, the terminal can obtain complete resource information from a single decoding operation, eliminating the need to decode multiple PDCCHs and significantly reducing power consumption
Data Source
AI summary
The present invention relates to a PDCCH transmission method for a base station on a mobile communications system supporting bandwidth aggregation, and more particularly the invention relates to a PDCCH transmission method comprising the step of generating downlink control data comprising resource-allocation configuration data for any desired sub-band and a sub-band other than the desired sub-band, and the step of transmitting the generated downlink control data to a mobile station through the PDCCH of the desired sub-band, and the invention also relates to a system therefor comprising a mobile station.