Cross-Carrier Control Region Size Detection in Heterogeneous Networks
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Solution Overview
Problem
Current wireless communication systems face challenges in reliably transmitting and detecting control region sizes, particularly in cross-carrier PDCCH signaling, leading to performance losses due to interference in heterogeneous networks.
Innovation Solution
The solution involves generating and transmitting control signals across multiple carriers, where the control region sizes are ascertained and either scrambled or related to ensure reliable transmission and detection, using techniques such as PDCCH CRC scrambling and interleaving to enhance PCFICH detection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross-carrier PDCCH signaling is used to reduce control overhead, then system efficiency is improved, but PCFICH detection reliability deteriorates due to interference in heterogeneous networks
Solution Approach 1:
The patent introduces an intermediary mechanism where the anchor carrier's PDCCH transmits not only scheduling information but also the control region size (PCFICH equivalent) of the non-anchor carrier. This intermediary transmission allows the UE to reliably obtain control format information without depending on the interference-prone PCFICH on the non-anchor carrier, thus resolving the contradiction between cross-carrier signaling efficiency and detection reliability.
2Measurement precision
If PCFICH is transmitted on non-anchor carriers to provide local control information, then detection accuracy is improved, but vulnerability to interference increases in heterogeneous networks
Solution Approach 1:
The patent extracts the critical control region size information from the vulnerable PCFICH transmission on the non-anchor carrier and relocates it to the more reliable anchor carrier's PDCCH. By taking out this essential information and transmitting it through a more robust channel, the system maintains detection accuracy while avoiding the interference vulnerability of the non-anchor carrier's PCFICH.
3Productivity
If control region size is dynamically adjusted per carrier to optimize resource allocation, then resource utilization is improved, but system complexity increases
Solution Approach 1:
The patent makes the anchor carrier's PDCCH serve multiple functions: it not only provides scheduling assignments but also conveys the control region size information of the non-anchor carrier. This multi-functionality allows the system to maintain dynamic resource allocation capabilities while avoiding the complexity of implementing separate PCFICH transmissions on each carrier, as the control information is universally provided through the anchor carrier's PDCCH.
Data Source
AI summary
Methods, apparatuses, and computer program products are disclosed for facilitating indicating and detecting control region sizes. A multi-carrier communication between a wireless terminal and a base station is facilitated by a first carrier having a first control region size and a second carrier having a second control region size. Embodiments are disclosed in which control region sizes are ascertained from a control signal, wherein the control is generated by either scrambling an aspect of the control signal based on the second control region size, or relating the second control region size with the first control region size. Other disclosed embodiments for ascertaining control region sizes include a reverse interleaver embodiment, wherein a set of modulation symbols is mapped beginning from a last data symbol and ending with a first available data symbol.