TDD Uplink Data Allocation Across Frequency-Time Resource Subsets
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Solution Overview
Problem
Existing wireless telecommunications networks face inefficiencies in uplink signal transmission, particularly when operating in TDD mode with large bandwidths, leading to suboptimal use of resources and power spectral density.
Innovation Solution
A dynamic transmission mode is implemented where uplink transmissions are allocated within a subset of downlink resources in both frequency and time, using guard bands and periods to isolate uplink and downlink signals, allowing flexible resource allocation without full TDD or FDD configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the entire bandwidth is allocated to uplink transmissions in TDD mode, then uplink transmission capacity is improved, but power spectral density becomes small and resource utilization efficiency deteriorates
Solution Approach 1:
The patent divides the frequency band into multiple subbands, allowing selective allocation of specific subbands for uplink transmissions rather than using the entire bandwidth. This segmentation enables the system to achieve sufficient uplink capacity through multiple smaller subbands while maintaining higher power spectral density in each allocated subband, thus resolving the contradiction between transmission capacity and energy efficiency.
2Adaptability or versatility
If a subset of downlink resources is used for uplink transmissions, then resource allocation flexibility is improved, but signal interference between uplink and downlink increases
Solution Approach 1:
The frequency band is divided into multiple subbands with specific subbands allocated for uplink and others for downlink. This segmentation creates clear frequency separation between uplink and downlink transmissions, reducing mutual interference while maintaining the flexibility to dynamically allocate different subband combinations based on traffic requirements.
Solution Approach 2:
The patent introduces guard bands as intermediary frequency regions between uplink and downlink subbands. These guard bands act as buffers that isolate the uplink and downlink signals, preventing direct interference while allowing flexible resource allocation within the available subbands.
3Object-generated harmful factors
If guard bands are introduced to isolate uplink and downlink signals, then signal interference is reduced, but bandwidth utilization efficiency deteriorates
Solution Approach 1:
Instead of using guard bands between every possible subband allocation, the patent applies guard bands selectively only where needed based on the specific uplink-downlink allocation pattern. This partial application minimizes the total bandwidth consumed by guard bands while still providing adequate isolation where interference would occur, thus balancing interference reduction with bandwidth utilization efficiency.
Data Source
AI summary
A method of communicating data in a telecommunications system comprising a base station and a plurality of terminals operable to communicate data to and from the base station. The system is configured to transmit downlink signals using downlink resources in a frequency band and in a first time period and the method comprises, upon identification of uplink data to be transmitted by a first terminal of the plurality of terminals, dynamically selecting a set of resources for transmitting the uplink data, wherein selecting the set of resources comprises selecting a subset of the frequency band and a subset of the time period of the downlink resources, the selected set of resources being based on the subset of the frequency band and the subset of the time period.