LTE Resource Element Segmentation for SFBC Transmission
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Solution Overview
Problem
In LTE R14, the increased complexity of isolated resource elements due to co-existing CSI-RS and DMRS in SFBC transmission leads to resource waste as entire OFDM symbols are discarded, which was not effectively managed in earlier releases like LTE R10.
Innovation Solution
A method to determine and utilize separate resource sets within a transmission subframe, allowing for accurate grouping and data transmission on isolated resource elements, thereby maximizing the use of physical layer resources and avoiding waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an entire OFDM symbol is discarded when an isolated resource element exists, then the terminal implementation complexity is reduced and determining speed is increased, but physical layer resources are wasted
Solution Approach 1:
The patent segments the resource elements in an OFDM symbol into two distinct sets: paired resource elements that follow SFBC rules and isolated resource elements that cannot be paired. This segmentation allows the system to process paired elements using standard SFBC procedures while handling isolated elements separately through alternative transmission methods, thereby avoiding the need to discard the entire OFDM symbol while maintaining manageable terminal complexity
Solution Approach 2:
The patent applies different transmission qualities and methods to different parts of the resource elements. Paired resource elements receive SFBC transmission with full redundancy, while isolated resource elements receive different treatment (such as single-antenna port transmission or other coding schemes). This local differentiation optimizes resource utilization by applying appropriate transmission strategies to each segment rather than uniformly discarding entire symbols
2Stability of the object's composition
If SFBC pairing rule is maintained in hybrid reference signal configuration, then transmission compatibility is preserved, but the location complexity of isolated resource element increases and determining speed decreases
Solution Approach 1:
The patent performs preliminary identification and classification of isolated resource elements before the actual data transmission process. By pre-determining which resource elements are isolated based on the hybrid reference signal configuration and SFBC pairing rules, the system prepares transmission strategies in advance, reducing the computational burden during real-time operation and improving determining speed while maintaining compatibility
Solution Approach 2:
The patent extracts and identifies the locations of isolated resource elements separately from the main SFBC pairing process. By taking out these problematic elements for special handling, the system can maintain the standard SFBC pairing rules for compatible elements while applying alternative methods only to the extracted isolated elements, thus preserving overall transmission compatibility while improving processing efficiency
3Adaptability or versatility
If quantity of isolated resource elements increases due to co-existing CSI-RS and DMRS, then reference signal functionality is enhanced, but resource waste increases due to discarding entire OFDM symbols
Solution Approach 1:
The patent segments resource elements based on their pairing status rather than discarding entire OFDM symbols. By identifying and separating isolated resource elements from paired ones, the system can maintain enhanced reference signal functionality through co-existing CSI-RS and DMRS while utilizing paired elements for data transmission and handling isolated elements through alternative methods, thereby reducing resource waste
Solution Approach 2:
Instead of permanently discarding OFDM symbols containing isolated resource elements, the patent recovers utility from these symbols by applying alternative transmission methods specifically to the isolated elements. This approach allows the system to maintain the enhanced functionality provided by multiple reference signals while recovering the resource value that would otherwise be lost through complete symbol discarding
Data Source
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Figure 3(a)~3(d)
Figure 4(a)~4(b)
AI summary
Embodiments of this application provide a data transmission method and apparatus. The method includes: determining, by a first device, a first resource set and a second resource set in a first transmission subframe; determining a data transmission manner on the first resource set and the second resource set; and implementing data transmission with a second device based on the determined data transmission manner by using the first transmission subframe, where the first resource set is a set of remaining resource elements other than resource elements paired based on a first pairing rule in all resource elements used for data transmission in the first transmission subframe, and the second resource set is a set of the resource elements paired based on the first pairing rule in the first transmission subframe. In this technical solution, physical layer resources are utilized to a maximum extent, thereby avoiding resource waste.