Enhanced Control Channel Resource Allocation for LTE CoMP
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE networks, face challenges with resource allocation for retransmission feedback due to limited capacity of control channels like PDCCH, especially in advanced communication technologies such as CoMP and CA, where existing control channel definitions become insufficient to support multiple users effectively.
Innovation Solution
The solution involves defining resource grants over an enhanced control channel using time division multiplexing (TDM) or frequency division multiplexing (FDM) within a subframe, allowing for orthogonal assignment of resources between the enhanced and legacy control channels, and using parameters like control channel elements (CCE) or physical resource blocks (PRB) to dynamically assign retransmission feedback resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control channel resources are allocated using traditional PDCCH definitions in LTE, then legacy device compatibility is maintained, but the control channel capacity becomes insufficient to support multiple users in advanced communication technologies like CoMP and CA
Solution Approach 1:
The control channel resources are segmented into separate regions: a first control channel region for legacy devices and a second control channel region for enhanced devices. This segmentation allows each region to be optimized independently, enabling the system to support both legacy LTE devices and advanced CoMP/CA technologies simultaneously without resource conflicts
Solution Approach 2:
The patent introduces a new dimension for control channel allocation by defining enhanced control channel regions in the time-frequency domain that are distinct from traditional PDCCH regions. This dimensional separation allows the system to expand control channel capacity beyond the limitations of conventional PDCCH definitions while maintaining backward compatibility
2Quantity of substance
If control channel capacity is increased to support more users, then resource allocation for retransmission feedback becomes more complex
Solution Approach 1:
The system implements self-service resource allocation where user equipment autonomously determines its retransmission feedback resources based on the control channel region it monitors. Devices in the first control channel region use traditional resource determination methods, while devices in the second region use enhanced methods, eliminating the need for complex centralized resource management
Solution Approach 2:
The patent introduces configurable parameters to define the boundaries and characteristics of enhanced control channel regions. By parameterizing the control channel structure (e.g., time-domain positions, frequency-domain allocations), the system can adapt to different deployment scenarios without fundamentally changing the resource allocation mechanism, thus managing complexity
3Productivity
If separate control channel regions are defined for legacy and enhanced devices, then resource reuse is optimized, but the device complexity increases
Solution Approach 1:
The patent designs a universal control channel framework that can serve both legacy and enhanced devices through a single standardized interface. The enhanced control channel region uses the same basic structures (DCI formats, resource allocation mechanisms) as traditional PDCCH, allowing devices to operate with unified processing logic while benefiting from differentiated resource allocation
Solution Approach 2:
The system implements dynamic control channel region configuration where the boundaries and characteristics of enhanced control channel regions can be adjusted based on traffic conditions, device capabilities, and network requirements. This dynamic adaptation allows the system to optimize resource reuse while minimizing device complexity by only activating enhanced features when needed
Data Source
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AI summary
A method, a computer program product, and an apparatus for determining retransmission feedback resources are provided. An apparatus receives a downlink resource assignment over a control channel and obtains an offset related to a region for retransmission feedback resources. The offset is determined based on a type of the control channel. The apparatus determines resources for communicating retransmission feedback for communications received over the downlink resource assignment based on an index of a resource related to the downlink resource assignment and the offset. The apparatus transmits retransmission feedback for the communications over the resources.