EPDCCH Resource Allocation in LTE Wireless Systems
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the existing control channel allocation methods are insufficient for efficient resource allocation and stability in receiving downlink control channels, especially with the introduction of enhanced-PDCCH (EPDCCH) which requires separate resource allocation and may face challenges in coexistence with legacy PDCCH, leading to increased complexity and potential resource allocation restrictions.
Innovation Solution
The method involves allocating resources for a first downlink control channel (PDCCH) and a second downlink control channel (EPDCCH) with the starting symbol index of EPDCCH greater than the last symbol index of PDCCH, using control format indicator (CFI) and higher layer signaling for resource definition, and allowing decoding of downlink data channels corresponding to EPDCCH, with search spaces defined as common or user equipment specific, enabling stable resource allocation and backward compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate resource allocation for EPDCCH is introduced, then enhanced control channel functionality is achieved, but device complexity and resource allocation restrictions increase
Solution Approach 1:
The patent segments the control channel resources by introducing separate allocation mechanisms for legacy PDCCH and enhanced EPDCCH. The EPDCCH is allocated in specific resource blocks distinct from legacy PDCCH resources, allowing independent configuration and management of each channel type without interference
Solution Approach 2:
The patent adds a new dimension to control channel allocation by introducing EPDCCH as an enhanced layer alongside the traditional PDCCH. This dimensional expansion allows simultaneous support for legacy and enhanced functionality through separate resource allocation in the frequency-time domain
2Adaptability or versatility
If EPDCCH and PDCCH coexist in the same system, then backward compatibility and enhanced functionality are achieved, but resource allocation restrictions and interference risks increase
Solution Approach 1:
The patent extracts EPDCCH resources from the legacy PDCCH resource pool, allocating them in separate resource blocks. This separation eliminates resource conflicts and interference between legacy and enhanced control channels while maintaining coexistence in the same system
Solution Approach 2:
The patent introduces search space concepts as intermediaries that mediate between PDCCH and EPDCCH allocations. The common search space and UE-specific search space provide structured frameworks that organize control channel resources and prevent interference through defined separation mechanisms
Data Source
AI summary
A method for receiving an EPDCCH (enhanced physical downlink control channel) by a user equipment (UE) in a wireless communication system, the method includes receiving an EPDCCH configuration including resource parameters related with a PDSCH (physical downlink shared channel) via a RRC(Radio Resource Control) signaling; and monitoring a search space to decode the EPDCCH from a starting OFDM (Orthogonal Frequency Division Multiplexing) symbol for the EPDCCH in a resource block set for the EPDCCH, according to the resource parameters related with the PDSCH, wherein if the UE is configured to associate with multiple transmission points, the starting OFDM symbol for the EPDCCH is set according to the resource parameters related with the PDSCH.