Relay Node Broadcast Augmentation via Difference Signal
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Solution Overview
Problem
Current techniques for supporting broadcast transmissions using relay nodes in cellular networks are suboptimal, leading to inefficient use of radio resources and potential errors in signal detection due to repeated transmissions and propagation delays, which can result in interference and reduced quality of service.
Innovation Solution
A method that supplements broadcast transmissions with augmented unicast transmissions, which carry additional error coding redundancy bits, dynamically adjusts parameters like transmit power and data rate, and is initiated based on channel conditions to improve signal detection accuracy and reduce duplicate transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broadcast transmission is repeated to relay nodes to ensure signal detection, then reliability of signal detection is improved, but radio resource consumption increases
Solution Approach 1:
Instead of repeating the full broadcast transmission to relay nodes, the patent applies partial action by transmitting only the difference signal (delta signal) that contains only the necessary correction information. This reduces the amount of data transmitted while still ensuring reliable signal detection at relay nodes, thereby resolving the contradiction between reliability and radio resource consumption.
Solution Approach 2:
The patent extracts the essential correction information from the full broadcast transmission and separates it into a distinct difference signal. By taking out only the necessary correction components rather than repeating the entire transmission, the system achieves reliable signal detection with reduced radio resource consumption.
2Measurement precision
If repeated transmissions are used to compensate for propagation delays, then signal detection accuracy is improved, but interference between transmissions increases
Solution Approach 1:
The patent extracts and transmits only the difference signal containing correction information separately from the main broadcast transmission. This extraction allows the relay node to accurately detect and compensate for propagation delays without the interference of repeated full transmissions, thereby improving signal detection accuracy while reducing interference.
Solution Approach 2:
The difference signal acts as an intermediary that carries correction information between the base station and relay node. This intermediary mechanism allows for accurate signal detection and delay compensation without causing interference, as the correction information is transmitted efficiently rather than through repeated full transmissions.
3Reliability
If unicast transmission is used to supplement broadcast to relay nodes, then signal detection reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the broadcast transmission and unicast supplementation into a unified approach where the base station transmits the broadcast signal and simultaneously sends the difference signal to relay nodes. This combining of operations achieves reliable signal detection at relay nodes without requiring separate complex unicast transmission systems, thereby reducing overall device complexity.
Data Source
AI summary
A method for supporting broadcast transmission in a wireless communication system (200) that comprises a plurality of communication cells, with broadcast content being routed from a base station (210) to at least one wireless communication unit (225, 226) via at least one relay node (RN) (224) is described. The method comprises, at the base station (210) broadcasting the broadcast content from the base station (210) to at least one from a group consisting of: the at least one RN (224), the at least one wireless communication unit (226); and supplementing the broadcast transmission with at least one augmented unicast transmission associated with the broadcast content. A base station (210), an integrated circuit and a non-transitory computer program product comprising executable program code are also described. A relay node (224), an integrated circuit, a method performed at the relay node and a non-transitory computer program product comprising executable program code are also described.