Backhaul Relay Control for Multiple HARQ Scheduling
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Solution Overview
Problem
Current wireless communication systems fail to effectively increase relay system coverage while employing power saving mechanisms and lack procedures for managing load conditions such as data and acknowledgment packets in multi-hop networks with relay stations.
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 a semi-static configuration of the relay physical downlink control channel 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 relay stations are added to increase coverage range and user data rates, then relay system coverage is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent segments the control channel resources by dividing the R-PDCCH region into two separate sets of OFDM symbols: one set for downlink scheduling assignments and another set for uplink scheduling assignments. This segmentation allows the relay station to process downlink and uplink control information separately, reducing the complexity of simultaneous processing while maintaining extended coverage capabilities through multi-hop relay operation.
2Productivity
If multiple HARQ processes are transmitted in a subframe, then data transmission efficiency is improved, but load management complexity increases
Solution Approach 1:
The patent applies segmentation by separating downlink and uplink scheduling assignments into different OFDM symbol sets. This enables the relay station to efficiently manage multiple HARQ processes by processing downlink control information for received transport blocks and uplink control information for transmitted transport blocks in distinct time resources, thereby supporting high productivity through parallel HARQ processes while keeping load management tractable through structured resource separation.
3Use of energy by stationary object
If power saving mechanisms are employed at relay stations, then energy consumption is reduced, but coverage extension capability is compromised
Solution Approach 1:
The patent implements periodic action through the semi-static configuration of R-PDCCH regions in alternating subframes. By establishing fixed patterns for downlink and uplink control channel locations that repeat periodically, the relay station can efficiently anticipate control information locations without continuous processing, enabling power saving mechanisms while maintaining reliable coverage extension through predictable multi-hop communication patterns.
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.