Asymmetric TDD Cell Uplink Parameter Integration
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Solution Overview
Problem
Existing wireless communication systems, particularly LTE-A, lack the capability for User Equipment (UE) to operate on asymmetric Time Division Duplex (TDD) cells, limiting the efficient use of TDD frequency spectrum due to the absence of uplink parameter information in system information.
Innovation Solution
Incorporating uplink parameter information into system information, which is broadcast or sent via dedicated signaling, allowing the UE to determine if it can operate on an asymmetric TDD cell and adjust accordingly, or select another cell if it cannot support the asymmetric configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink parameter information is not included in system information, then the system maintains simplicity and compatibility with existing UEs, but the TDD frequency spectrum cannot be used efficiently due to inability to support asymmetric TDD cells
Solution Approach 1:
The patent applies asymmetry by introducing separate uplink parameter information for TDD cells, allowing the uplink and downlink configurations to differ. This enables asymmetric TDD operation where uplink and downlink bandwidths can be independently configured, thereby improving spectrum utilization efficiency while maintaining a relatively simple system information structure through targeted parameter addition rather than complete restructuring
Solution Approach 2:
The patent changes the parameter structure of system information by adding specific uplink parameter fields (such as uplink bandwidth, uplink frequency offset) to the existing downlink parameter information. This parameter enhancement allows the system to support asymmetric TDD configurations without fundamentally altering the overall system information framework, thus improving productivity while controlling complexity
2Productivity
If the system supports asymmetric TDD cells, then spectrum usage efficiency improves, but existing UEs that cannot operate on asymmetric TDD cells will fail to function properly
Solution Approach 1:
The patent applies preliminary action by including capability indication parameters in the system information that allow UEs to determine in advance whether they support asymmetric TDD operation. This enables UEs to self-select appropriate cells before attempting connection, ensuring that existing UEs can identify and avoid asymmetric TDD cells while newer UEs with asymmetric support can utilize them, thus maintaining backward compatibility while enabling forward progress
Solution Approach 2:
The patent enhances universality by designing the system information structure to serve multiple functions: it provides downlink configuration information for all UEs, uplink parameter information for asymmetric-capable UEs, and capability indication for UE self-selection. This multi-functional approach allows the same system information framework to support both symmetric and asymmetric TDD operations, as well as both legacy and advanced UEs simultaneously
3Reliability
If guard bandwidths are reserved between TDD and FDD frequency spectrums, then interference between TDD and FDD is avoided, but the available TDD spectrum resources are reduced
Solution Approach 1:
The patent applies asymmetry by enabling different bandwidth configurations for uplink and downlink in TDD cells. This allows the system to utilize the guard bandwidths more effectively by allocating them asymmetrically - for example, using more bandwidth for downlink where interference protection is less critical, and maintaining narrower uplink bandwidth where interference avoidance is more important. This asymmetric allocation increases the total usable TDD spectrum resources while maintaining interference avoidance through appropriate configuration
Data Source
Figure 1A~1B
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Figure 5~6
AI summary
Embodiments of the present application relate to the technical field of radio communication, and particularly to a method, system, and device for working on a TDD cell for enabling a UE to work on an asymmetric TDD cell. According to the embodiments of the present application, the method comprises: A network side device determining uplink parameter information of the asymmetric TDD cell; and the network side device putting the uplink parameter information into system information and sending the system information to a terminal to instruct the terminal to work on the corresponding asymmetric TDD cell according to the system information. In the embodiments of the present application, the uplink parameter information is added to the system information so that the terminal can work on the asymmetric TDD cell according to the system information, thereby improving the efficiency of the terminal.