Relay Station Data Frame Structure for Wireless Communication
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Solution Overview
Problem
In communication systems with relay stations, excessive assignment of radio resources to links between the base station and relay stations can lead to inefficient use of time resources, resulting in decreased throughput as the number of relay stations increases, causing insufficient resources for other radio links, such as those between the base station and terminals.
Innovation Solution
The implementation of a data frame structure that includes a first uplink/downlink relay sub-frame where selected relay stations simultaneously transmit/receive signals using the same frequency resource, and a second sub-frame where remaining relay stations use scheduled radio resources, allowing adaptive adjustment of sub-frame lengths and employing transmission power, interference, and multi-antenna schemes to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radio resources are assigned to all relay stations individually, then each relay station can transmit signals, but time resources are excessively consumed and system throughput decreases
Solution Approach 1:
Multiple relay stations are merged into a single transmission group that shares the same time-frequency resource. The relay stations transmit signals simultaneously on the same resource block, converting individual sequential transmissions into a combined parallel transmission, thereby reducing time resource consumption while maintaining transmission reliability through coordinated multi-point transmission.
Solution Approach 2:
The patent transitions from a one-dimensional sequential transmission approach (one relay station at a time) to a multi-dimensional simultaneous transmission approach by introducing spatial dimension (multiple relay stations) and frequency dimension (resource blocks). This allows multiple relay stations to transmit on the same time-frequency resource using different spatial paths, reducing time consumption while maintaining reliability.
2Adaptability or versatility
If more time resources are assigned to relay station links, then relay communications are supported, but resources for base station to terminal links become insufficient
Solution Approach 1:
The patent implements dynamic resource allocation where the number of relay stations sharing a resource block and the allocation of resource blocks are adjusted based on channel conditions, traffic demands, and system load. This dynamic adaptation allows the system to optimize the balance between relay station support and terminal link resources, maintaining high system throughput while providing versatile relay communication support.
Solution Approach 2:
The system changes key parameters such as the number of relay stations per resource block, the total number of resource blocks allocated to relay links versus terminal links, and transmission power levels. By dynamically adjusting these parameters based on system state, the patent optimizes resource distribution to maintain high throughput while supporting relay station communications.
3Loss of time
If relay stations transmit on the same frequency resource simultaneously, then time resource efficiency improves, but interference between signals increases
Solution Approach 1:
Different relay stations transmitting on the same resource block are assigned different local transmission characteristics such as distinct cyclic prefix lengths, different orthogonal cover codes, or localized frequency shifts. These local quality differences allow simultaneous transmissions to be distinguished and separated at the receiver, reducing interference while maintaining time resource efficiency.
Solution Approach 2:
The patent introduces intermediary signaling mechanisms including reference signals, pilot signals, and control information that mediate between simultaneous transmissions from multiple relay stations. These intermediaries enable the receiver to distinguish and separate overlapping signals, reducing interference effects while allowing efficient simultaneous transmission on the same time-frequency resource.
Data Source
AI summary
Provided is a communication method and a data frame for a communication system having a relay station. An uplink sub-frame of the data frame may include a first uplink relay sub-frame which corresponds to a time frame where relay stations selected among a plurality of relay stations simultaneously transmit uplink relay signals to a base station, and a second uplink relay sub-frame which corresponds to a time frame where the remaining relay stations transmit remaining uplink relay signals to the base station using a scheduled radio resource. A downlink sub-frame of the data frame may include a first downlink relay sub-frame which corresponds to a time frame where a base station simultaneously transmits downlink relay signals to relay stations selected from among a plurality of relay stations, and a second downlink relay sub-frame which corresponds to a time frame where the base station transmits remaining downlink relay signals to the remaining relay stations using a scheduled radio resource.