Relay System Data Frame Structure for Fading Environments
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Solution Overview
Problem
Conventional radio communication systems face challenges in maintaining communication quality due to fading phenomena, especially in environments where spatial diversity techniques are not feasible, and lack effective data transmission schemes using relays to determine optimal signal paths.
Innovation Solution
A relay system that receives and transmits radio resource allocation information to allocate and utilize specific radio resources for data transmission from a transmission apparatus to a receiving apparatus, enabling efficient data forwarding through a relay using allocated radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay is introduced to transmit data from a base station to a terminal, then communication quality can be improved in fading environments, but device complexity increases due to the need for additional relay nodes and path determination signaling
Solution Approach 1:
A relay node is introduced as an intermediary between the base station and terminal to forward data transmissions. The relay receives data from the base station on a first radio resource and transmits it to the terminal on a second radio resource, enabling improved signal reception in fading environments without requiring direct optimal path establishment between base station and terminal
Solution Approach 2:
The relay node performs multiple functions: receiving data from the base station, determining whether to forward data based on buffer status and path conditions, and transmitting data to the terminal. This multi-functional approach consolidates path determination and data forwarding capabilities in a single node, reducing overall system complexity
2Measurement precision
If radio resource allocation information is transmitted to the relay, then optimal path determination is enabled, but loss of information increases due to additional signaling requirements
Solution Approach 1:
The path determination logic is extracted from the base station and implemented at the relay node. The base station transmits only essential radio resource allocation information to the relay, while the relay independently determines whether to forward data based on its local buffer status and received signal conditions, reducing signaling overhead
Solution Approach 2:
The relay node uses feedback from its buffer status and received data quality to determine whether to forward data. This feedback mechanism enables the relay to make autonomous path determination decisions based on current channel conditions without requiring continuous detailed signaling from the base station
3Reliability
If the relay forwards data using allocated radio resources, then data transmission reliability is improved, but loss of time occurs due to the additional transmission hop
Solution Approach 1:
The base station pre-allocates both the first radio resource for downlink transmission to the relay and the second radio resource for uplink transmission from the relay to the terminal within the same transmission time interval. This preliminary resource allocation enables the relay to forward data without waiting for separate resource grant procedures, minimizing processing and signaling delays
Data Source
AI summary
A structure of a data frame for transmitting data via a relay, and a transmission apparatus and a relay using the data frame are provided. The relay includes: a receiver to receive, from a transmission apparatus, first radio resource allocation information with respect to a first radio resource and second radio resource allocation information with respect to a second radio resource, and to receive first data from the transmission apparatus using the first radio resource allocation information; and a transmitter to transmit the received first data to a receiving apparatus using the second radio resource allocation information.