ePDCCH Cross Carrier Scheduling via Search Space Configuration
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Solution Overview
Problem
The existing LTE-Advanced system lacks effective methods for performing cross carrier scheduling in Enhanced PDCCHs (ePDCCHs), which leads to inefficiencies in resource allocation and increased interference, limiting system throughput and maximum transmission rates.
Innovation Solution
A transmission and reception apparatus/method that configures and transmits control information across multiple component carriers by establishing first and second search spaces within the same allocation units, allowing control information for different component carriers to be mapped and received, thereby enabling proper cross carrier scheduling in ePDCCHs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control signals are mapped in the PDCCH region, then downlink data can be assigned to terminals, but the PDCCH region becomes insufficient due to resource shortage from MIMO and M2M communication
Solution Approach 1:
The patent segments the control signal mapping by introducing a new ePDCCH region in the data region, separate from the traditional PDCCH region. This allows control signals to be mapped in two different regions (PDCCH and ePDCCH), effectively dividing the control signaling function across multiple locations to avoid resource shortage in the PDCCH region.
Solution Approach 2:
The patent extends control signal mapping from the traditional time-frequency PDCCH region to an additional spatial dimension by introducing the ePDCCH region within the data region. This dimensional expansion provides more resources for control signaling without reducing the original PDCCH region capacity.
2Reliability
If control signals are mapped in the data region (ePDCCH region), then transmission power control and interference control are improved, but cross carrier scheduling functionality is lacking
Solution Approach 1:
The patent makes the ePDCCH region serve multiple functions: it provides control signal mapping for interference control, and simultaneously enables cross carrier scheduling by allowing search spaces for scheduling other component carriers to be configured within the same ePDCCH region. This multi-functionality resolves the lack of cross carrier scheduling capability.
3Productivity
If multiple search spaces are configured for cross carrier scheduling, then resource allocation efficiency improves, but interference between control signals increases
Solution Approach 1:
The patent applies local quality by configuring different search spaces with different properties within the ePDCCH region. Specifically, it allows localized search spaces for cross carrier scheduling to be configured separately from other control signals, enabling differentiated resource allocation that improves efficiency while managing interference through spatial separation within the same region.
Data Source
AI summary
Disclosed is a transmission apparatus capable of properly performing cross carrier scheduling in ePDCCHs. In this apparatus, when communication is performed using a plurality of component carriers (CCs), configuration section 102 configures a first search space as a candidate to which control information for a first CC is assigned and a second search space as a candidate to which control information for a second CC other than the first CC among the plurality of CCs is assigned, within a same allocation unit group among a plurality of allocation unit groups included in a data-assignable region within the first CC, and transmission section 106 transmits control information mapped to the first search space and control information mapped to the second search space.