ePDCCH Resource Allocation for Scalable Wireless Control Channels
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Solution Overview
Problem
Existing control channels in wireless networks are inefficient due to fixed resource allocation, leading to underutilization of resources, excessive overhead, and interference, which limits capacity and scalability, particularly in diverse and dense deployments.
Innovation Solution
Implementing an Enhanced Physical Downlink Control Channel (ePDCCH) that is distributed across the spectral bandwidth, using Demodulation Reference Signals for channel estimation, and allowing flexible resource allocation and interference coordination, supporting multiple transmission points and diverse scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-determined control channel resources are allocated, then control channel reliability is improved, but network resource utilization deteriorates
Solution Approach 1:
The patent implements dynamic control channel resource allocation where the control channel resources are not fixed but adaptively adjusted based on current network conditions, traffic load, and channel state information. This allows the system to optimize both reliability and resource utilization by allocating control resources dynamically rather than using pre-determined static allocation.
Solution Approach 2:
The system changes key parameters such as control channel resource allocation, modulation and coding schemes, and transmission power based on real-time network conditions. By adjusting these parameters dynamically, the system maintains control channel reliability while improving overall network resource utilization efficiency.
2Reliability
If robust coding schemes with increased redundancy are used, then control channel reliability is improved, but network overhead increases
Solution Approach 1:
The patent dynamically adjusts coding redundancy parameters based on channel conditions and traffic requirements. When channel conditions are good, less redundancy is used, reducing overhead. When conditions deteriorate, redundancy is increased to maintain reliability, optimizing the trade-off between reliability and overhead.
Solution Approach 2:
The system transitions from static coding schemes to dynamic adaptive coding where the redundancy level is continuously adjusted based on real-time feedback from channel quality indicators and packet error rates, allowing optimal balance between reliability and overhead.
3Reliability
If higher transmission power is used for control channels, then control channel reliability is improved, but interference to other channels increases
Solution Approach 1:
The patent implements localized control channel transmission where control information is transmitted only to specific user equipment in specific geographic locations or beam directions rather than omnidirectionally. This concentrates power where needed for reliability while minimizing interference to other channels and users in different spatial regions.
Solution Approach 2:
The system dynamically adjusts control channel transmission power based on real-time channel conditions, user location, and interference measurements. Power is increased only when and where necessary to maintain reliability, rather than using uniformly high power across all conditions, thereby reducing overall interference.
4Adaptability or versatility
If control channel capacity is increased, then network scalability is improved, but resource overhead increases
Solution Approach 1:
The patent segments control information into multiple parts or layers, allowing selective transmission of only the most critical control information in high-overhead scenarios, while transmitting complete control information when resources are abundant. This segmentation enables scalable control channel capacity while managing overhead efficiently.
Solution Approach 2:
The system designs control channel resources to serve multiple functions simultaneously - carrying both critical control information and less critical data, supporting both widecast and unicast transmissions, and adapting to different service types. This multi-functionality increases effective control channel capacity without proportionally increasing dedicated overhead resources.
Data Source
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AI summary
Methods and apparatus to enable an extensible and scalable control channel for wireless networks. In one embodiment, an Enhanced Physical Downlink Control Channel (ePDCCH) is disclosed that is implemented with a flexible number of Physical Resource Blocks (PRBs). Advantages of the ePDCCH include, for example: more efficient spectral utilization, better frequency management across multiple serving entities (e.g., base stations and remote radio heads), and extensible payload capabilities that can scale to accommodate higher or lower control information payloads, as compared to prior art PDCCH solutions.