Relay Node Subframe Segmentation for Interference Reduction
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Solution Overview
Problem
In cellular communication networks, relay nodes face challenges in simultaneously receiving and transmitting signals on the same frequency band, leading to interference and reduced ability to receive weak signals due to strong transmit signals, which is problematic for LTE R8 conform user equipments that require reference signals in each subframe for channel estimation.
Innovation Solution
A network element that can switch between transmitting and receiving states within a single subframe, allowing for the transmission of reference signals during one part of the subframe and data reception during another, optimizing the use of MBSFN subframes to minimize switching and maintain communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a relay node transmits signals on the same frequency band, then transmission capability is improved, but the ability to receive weak signals deteriorates due to strong transmit signals causing interference
Solution Approach 1:
The subframe is segmented into multiple slots, with each slot dedicated to a specific function (reference signal transmission, data reception, or data transmission). This temporal segmentation allows the relay node to switch between transmit and receive modes without simultaneous operation on the same frequency band, eliminating self-interference while maintaining communication efficiency
Solution Approach 2:
The relay node dynamically switches between transmitting and receiving states within each subframe based on the slot configuration. This dynamic state switching enables the system to adapt transmission and reception timing, allowing reference signals to be transmitted in certain slots while data is received in other slots, resolving the contradiction between transmission power and reception sensitivity
2Measurement precision
If reference signals are transmitted in every subframe for channel estimation, then channel estimation accuracy is improved, but device complexity increases due to continuous transmission requirements
Solution Approach 1:
Reference signal transmission is segmented to occur only in specific slots within subframes rather than continuously in every subframe. The slot structure allows reference signals to be transmitted in designated slots while other slots are used for data communication, reducing overall transmission complexity while maintaining channel estimation capability through periodic reference signals
Solution Approach 2:
Reference signals are transmitted periodically in specific slots rather than continuously. This periodic transmission pattern maintains channel estimation accuracy by providing regular reference measurements while reducing device complexity by eliminating continuous reference signal transmission, allowing the system to operate in a more efficient manner
3Adaptability or versatility
If a relay node switches between transmitting and receiving states frequently, then communication flexibility is improved, but loss of time increases due to switching overhead
Solution Approach 1:
The subframe is divided into multiple slots that can be configured in different patterns (e.g., 2:2, 3:1, 4:0 transmit-receive ratios). This segmentation allows flexible adaptation to different communication scenarios while maintaining relatively long slot durations that minimize the frequency of switching operations, thereby reducing switching overhead and time loss
Solution Approach 2:
The slot configuration is dynamically adjustable to match different communication requirements, allowing the system to optimize the balance between transmission and reception time. This dynamic configurability provides communication flexibility for various scenarios (voice, data, broadcasting) while the slot-based structure keeps switching events limited to slot boundaries, minimizing switching time overhead
Data Source
AI summary
The exemplary embodiments of the invention provide at least a method and apparatus to adapt a network element (201, 203) for a communication network (200), wherein the network element (201, 203) is adapted to switch between a first state and a second state to the first state during a subframe (303) of a communication in the communication network (200). Further, in accordance with the exemplary embodiments there is at least a method and apparatus to adapt a network element (201, 203) to receive signals during the second state and transmit signals during the first state.