Dynamic MRTD Adjustment for Carrier Aggregation Latency
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Solution Overview
Problem
Conventional wireless communication networks face issues with packet data latency due to transport time of data and control signaling, and they require an unnecessary large timing misalignment margin in Carrier Aggregation (CA) or dual connectivity (DC) operations, leading to increased latency and inefficiencies in resource allocation.
Innovation Solution
A wireless device and method that dynamically adjust the Maximum Receive Timing Difference (MRTD) parameter based on the transmission time intervals (TTIs) of different carriers, allowing for flexible TTI patterns and reduced power mismatch by scaling the MRTD with TTI duration, enabling better timing alignment and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large timing misalignment margin (MRTD) is used to compensate for propagation delay and synchronization differences in CA/DC operations, then reliability of signal reception is improved, but latency increases and resource efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the MRTD parameter adjustable and adaptive rather than fixed. The network can dynamically configure different MRTD values for different cells/carriers based on actual timing conditions, allowing the system to reduce the timing margin when conditions permit, thereby reducing latency while maintaining reliability when needed.
Solution Approach 2:
The patent implements local quality by allowing different MRTD parameters to be applied to different cells or carriers individually. This enables each cell to have its own optimized timing margin based on its specific propagation characteristics and synchronization status, rather than using a uniform large margin across all cells, thus improving overall resource efficiency and reducing unnecessary latency.
2Ease of operation
If a fixed MRTD parameter is used for longer TTI duration, then ease of operation is improved, but adaptability to different TTI patterns and carriers deteriorates
Solution Approach 1:
The patent makes the MRTD parameter dynamic by allowing the network to configure different values based on TTI duration and carrier characteristics. This enables the system to adapt to varying TTI patterns (e.g., different slot lengths, mini-slots) and carrier frequencies while maintaining operational simplicity through automated network-side configuration rather than complex device-side calculations.
Solution Approach 2:
The patent applies parameter changes by adjusting the MRTD value based on the TTI duration and carrier-specific requirements. The network can scale the MRTD parameter proportionally with TTI duration or set appropriate values for different carrier types, enabling the system to handle diverse TTI patterns and carrier configurations without compromising operational ease at the device level.
3Reliability
If an unnecessary large timing misalignment margin is used in CA/DC operations, then reliability of receiving signals from multiple cells is improved, but resource allocation efficiency and system capacity deteriorate
Solution Approach 1:
The patent applies local quality by enabling individual MRTD optimization for each cell in CA/DC operations. Instead of applying a uniform large margin to all cells, the network can configure appropriate MRTD values for each cell based on its specific timing characteristics, reducing the overall timing margin requirement and freeing up radio resources for increased system capacity while maintaining reliable multi-cell reception.
Solution Approach 2:
The patent implements parameter changes by allowing the MRTD to be scaled and adjusted based on actual timing conditions in CA/DC scenarios. This enables the system to reduce unnecessary timing margins that would otherwise consume valuable radio resources, thereby improving resource allocation efficiency and increasing system capacity while maintaining the reliability needed for coordinated multi-cell operation.
Data Source
AI summary
The disclosure relates to a method and wireless device configured for communication in a wireless communication network, the method comprising the steps of obtaining a first transmission time interval, TTI, used for transmission timing of a first signal, obtaining a second TTI, used for transmission timing of a second signal, obtaining a maximum received time difference, MRTD, parameter, and operating the first signal between a wireless device and a first cell using the MRTD parameter and a first carrier, and the second signal between the wireless device and a second cell using the MRTD parameter and a second carrier, the second carrier being different from the first carrier, wherein the MRTD parameter is obtained by determining the MRTD parameter based on the first and the second TTI. The disclosure further relates to a network node and a method thereof.