ePDCCH Resource Allocation via Sparse Candidate Distribution
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Solution Overview
Problem
Current methods for allocating and detecting downlink control channel resources in ePDCCH localized transmission lack specific candidate distribution rules, particularly for precoding and transparent DCI message transmission, which are not supported by existing DCI receiving procedures.
Innovation Solution
The method involves allocating a resource area for ePDCCH localized transmission in a UE-specific manner, with at most one ePDCCH candidate per resource allocation granularity, and using UE ID-based offsets to configure search spaces, allowing for sparse distribution of candidates and maximizing frequency selective gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ePDCCH localized transmission is implemented with existing DCI receiving procedures, then frequency selective gain can be achieved, but candidate distribution rules are insufficient for precoding and transparent DCI message transmission
Solution Approach 1:
The patent changes the parameters of candidate distribution by introducing UE-specific resource area allocation and limiting candidates per resource allocation granularity. This modifies the existing DCI receiving procedure parameters to accommodate precoding and transparent DCI message transmission while maintaining frequency selective gain through localized transmission.
Solution Approach 2:
The patent segments the resource area into resource allocation granularities and distributes ePDCCH candidates across these segments. Each segment contains at most one candidate, creating a structured distribution pattern that works with precoding schemes and transparent DCI transmission while preserving frequency selectivity.
2Reliability
If multiple ePDCCH candidates are allocated in each resource allocation granularity, then DCI detection coverage is improved, but frequency spectrum efficiency deteriorates
Solution Approach 1:
The patent applies partial action by allocating at most one candidate per resource allocation granularity rather than multiple candidates. This partial allocation approach maintains sufficient DCI detection coverage while avoiding excessive resource consumption, thereby preserving frequency spectrum efficiency.
3Reliability
If ePDCCH candidates are densely distributed, then DCI detection reliability is improved, but frequency diversity gain is reduced
Solution Approach 1:
The patent applies local quality by concentrating ePDCCH candidates within UE-specific resource areas rather than uniform distribution across the entire bandwidth. This creates localized dense distribution within specific frequency regions, maintaining detection reliability for targeted UEs while preserving frequency diversity through the UE-specific resource allocation approach.
Data Source
AI summary
Embodiments of the present invention disclose methods and devices for allocating and detecting downlink control channel resources. The method for allocating downlink control channel resources comprises: allocating a resource area for enhanced Physical Downlink Control Channel, ePDCCH, localized transmission in a UE-specific way; and allocating at most one ePDCCH candidate for the ePDCCH localized transmission in each resource allocation granularity within the resource area. According to the embodiments of the present invention, the ePDCCH candidates at each aggregation level are distributed to radio resources sparsely so that sufficient options can be provided for resource allocation.