Backhaul Relay HARQ Scheduling with Semi-Static R-PDCCH
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Solution Overview
Problem
Current wireless communication systems fail to effectively increase relay system coverage while employing power saving mechanisms for relay stations and lack procedures for managing load conditions such as data and acknowledgment packets in multi-hop networks.
Innovation Solution
A base station and relay station system is designed to transmit and receive multiple Hybrid Automatic Repeat Request (HARQ) processes and OFDM symbols in resource blocks, with semi-static configuration of the relay physical downlink control channel region to manage downlink and uplink scheduling assignments, enabling efficient communication through multiple antennas and transceivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple HARQ processes are transmitted in a single subframe to increase relay system coverage, then the coverage range and data transmission efficiency are improved, but the device complexity and processing load increase
Solution Approach 1:
The patent segments the subframe into multiple distinct sets of OFDM symbols, with each set dedicated to specific HARQ processes. This segmentation allows the relay station to process different HARQ processes in organized time slots rather than handling all processes simultaneously, reducing processing complexity while maintaining multiple process support
Solution Approach 2:
The patent implements dynamic configuration where the number and allocation of OFDM symbol sets for different HARQ processes can be adjusted based on traffic conditions and system requirements. This dynamic approach allows the system to optimize between coverage extension and processing complexity by activating only the necessary number of HARQ processes
2Productivity
If multiple OFDM symbols are configured for multiple HARQ processes to improve data transmission efficiency, then the productivity increases, but the device complexity increases
Solution Approach 1:
The control channel configuration is segmented into multiple distinct OFDM symbol sets, where each set is explicitly assigned to specific HARQ processes. This segmentation simplifies the control channel structure by providing clear demarcation between different process allocations, making it easier to manage and process despite supporting multiple processes
Solution Approach 2:
The patent employs semi-static configuration where the allocation of OFDM symbol sets to HARQ processes is predetermined through higher layer signaling. This preliminary configuration reduces real-time processing complexity by establishing the mapping structure in advance, allowing the system to achieve high productivity without proportional increases in real-time control complexity
3Ease of operation
If semi-static configuration of R-PDCCH region is implemented to manage load conditions, then the ease of operation improves, but the adaptability decreases
Solution Approach 1:
The patent implements a hybrid approach where the R-PDCCH region configuration is semi-static rather than fully fixed. This allows the configuration to be updated periodically through higher layer signaling to adapt to changing traffic conditions and system requirements, balancing the ease of operation from static configuration with the adaptability needed for varying load conditions
Data Source
AI summary
A wireless communication network includes a base station and a relay station. The relay station is configured to relay communications between the base station and at least one subscriber station. The base station is configured to communicate with the subscriber station via the relay station. The base station further is configured to transmit, in a subframe, a plurality of transport blocks for a plurality of Hybrid Automatic Repeat Request (HARQ) processes to the relay station. Each transport block corresponds to a different HARQ process.