D2D Control Channel Allocation via Partial Bandwidth
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Solution Overview
Problem
In wireless access systems, device-to-device (D2D) communication lacks an efficient method for allocating control channels between devices, relying on base stations for resource and channel scheduling, which limits direct communication capabilities.
Innovation Solution
A method for allocating a control channel in a wireless access system for D2D communication, where a base station assigns a resource region and the D2D devices transmit and receive control channels within a partial bandwidth of this region, using a physical downlink shared channel (PDSCH) resource, with channel quality indicators and aggregation levels managed to optimize channel allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication is implemented without base station scheduling, then direct communication efficiency is improved, but control channel allocation becomes complex
Solution Approach 1:
The patent uses the base station as an intermediary to allocate control channels for D2D communication. The BS assigns specific resource regions and control channel parameters to D2D devices, enabling direct communication while maintaining centralized control to simplify the allocation process.
Solution Approach 2:
The patent divides the available spectrum into specific resource regions for D2D communication, with further segmentation into control channel regions and data channel regions. This structured segmentation provides clear allocation rules and reduces complexity in managing control channel resources.
2Device complexity
If base station schedules all control channels, then allocation complexity is reduced, but communication efficiency decreases
Solution Approach 1:
The patent enables D2D devices to autonomously select and use control channels from pre-allocated resource regions. Once the base station configures the resource regions, devices can independently perform control channel selection and communication without continuous base station intervention, improving efficiency while maintaining manageable complexity.
3Reliability
If control channel bandwidth is increased, then transmission reliability is improved, but resource utilization decreases
Solution Approach 1:
The patent allocates different bandwidths to control channels based on local requirements. Each D2D communication pair receives appropriate control channel resources according to their specific needs, rather than uniformly allocating maximum bandwidth to all, thus improving reliability where needed while optimizing overall resource utilization.
4Adaptability or versatility
If resource region is allocated for D2D communication, then direct communication is enabled, but interference with traditional BS communication increases
Solution Approach 1:
The patent segments the available spectrum into distinct resource regions, with specific portions allocated for D2D control channels and data channels. This frequency-domain segmentation isolates D2D transmissions from traditional BS communication, enabling direct communication while minimizing interference through careful resource partitioning.
Data Source
AI summary
Disclosed are a method and an apparatus for transceiving a control channel for performing device-to-device (D2D) communication in a wireless access system that supports D2D communication. More particularly, the method for transmitting a control channel by a transmitter side D2D communication device according to one embodiment of the present invention comprises: a step of allocating the resource region to be used in the D2D communication by a base station; and a step of transmitting the control channel to a receiver side D2D communication device through the control channel bandwidth which is a portion of the bandwidth of the allocated resource region. The time resource of the resource region may be a resource region to be allocated for transmission via the physical downlink shared channel (PDSCH) from the base station.