EPDCCH Resource Allocation Avoiding PSS SSS PBCH Collision
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Solution Overview
Problem
In wireless communication networks, particularly in LTE-A systems, there is a challenge in allocating resources for Enhanced Physical Downlink Control Channel (EPDCCH) without colliding with Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and Physical Broadcast Channel (PBCH) signals, leading to resource wastage and performance issues, especially in systems that only support DMRS-based transmissions.
Innovation Solution
The method involves determining potential collisions between EPDCCH decoding candidates and PSS/SSS/PBCH resources, and processing these candidates to avoid collisions by re-defining DMRS patterns or resource allocations, allowing EPDCCH transmission in non-colliding resource blocks, and employing cross-carrier scheduling to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If EPDCCH resources are allocated in subframes containing PSS/SSS/PBCH, then resource utilization improves, but resource collision occurs leading to transmission failures
Solution Approach 1:
The patent segments the EPDCCH decoding candidates into multiple candidates and individually evaluates each candidate for potential collision with PSS/SSS/PBCH resources. By processing candidates in segments rather than as a bulk group, the system can selectively transmit non-colliding candidates while avoiding collision-prone ones, thus improving both resource utilization and transmission reliability
Solution Approach 2:
The patent performs preliminary collision detection by determining whether EPDCCH decoding candidates can potentially collide with PSS/SSS/PBCH resources before actual transmission. This preliminary action allows the system to pre-identify and exclude problematic candidates, preventing transmission failures before they occur while maximizing usable resource allocation
2Reliability
If resource collision detection and avoidance is implemented, then transmission reliability improves, but processing complexity increases
Solution Approach 1:
The patent applies partial action by implementing collision detection only for specific EPDCCH decoding candidates that are most likely to collide with PSS/SSS/PBCH resources, rather than uniformly processing all candidates. This selective approach reduces processing complexity while maintaining transmission reliability for the critical candidates
Solution Approach 2:
The system performs self-service by having the UE autonomously determine and process EPDCCH decoding candidates, including self-evaluating potential collisions with synchronization signals. This self-service mechanism distributes processing tasks efficiently without requiring additional complex coordination infrastructure
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for systems that support DMRS-based transmissions, that may allow such systems to at least partially utilize resources in the center six RBs of subframes 0 and 5 for DMRS-based transmissions (e.g., EPDCCH), while avoiding collision with Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS) or Physical Broadcast Channel (PBCH).