Wireless TxOP Configuration for Unlicensed Band Carrier Aggregation
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Solution Overview
Problem
Wireless access systems face challenges in efficiently transmitting and receiving data in unlicensed bands, particularly when multiple serving cells are aggregated in a carrier aggregation environment, and in defining and configuring transmission opportunity periods.
Innovation Solution
A method for a UE to receive configuration information for a transmission opportunity (TxOP) period in a wireless access system supporting carrier aggregation, where the UE receives higher layer signals on a primary cell to determine the size and use of the TxOP period, and transmits and receives data based on scheduling information in a secondary cell, with the TxOP period defined by the number of subframes and its use set for downlink or uplink data transmission, and the inclusion of subframes determined by the transmission direction of the primary cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation with multiple serving cells is used in unlicensed band, then data transmission rate is improved, but system complexity and resource allocation difficulty increase
Solution Approach 1:
The patent segments the unlicensed band resources by introducing Transmission Opportunity (TxOP) periods that are separately configured for each serving cell. This allows independent resource management for each cell while maintaining carrier aggregation, thereby improving data transmission rate without overwhelming system complexity. The segmentation of resource allocation into cell-specific TxOP periods enables scalable deployment.
Solution Approach 2:
The patent applies preliminary action by configuring TxOP period parameters (size, usage, starting position) in advance through higher layer signaling before actual data transmission. This pre-configuration approach allows the system to prepare resource allocation patterns ahead of time, reducing real-time decision complexity while enabling high-speed data transmission during the pre-defined TxOP periods.
2Productivity
If TxOP period is configured for each serving cell, then data transmission efficiency is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent implements universality by designing a unified TxOP configuration framework that can be applied to both licensed and unlicensed bands, and to both primary and secondary serving cells. The same higher layer signaling mechanism and TxOP parameter structure are used across different cell types and band configurations, reducing the need for cell-specific customization and thereby minimizing signaling overhead while maintaining transmission efficiency.
3Stability of the object's composition
If subframe inclusion is determined by primary cell transmission direction, then coordination between cells is improved, but flexibility in secondary cell resource utilization is reduced
Solution Approach 1:
The patent applies dynamics by making the subframe inclusion rule adaptive rather than static. While the general principle ties subframe inclusion to primary cell transmission direction for coordination stability, the system dynamically adjusts the specific application based on secondary cell conditions. The network can configure whether secondary cell subframes are included in TxOP periods based on actual transmission directions and resource availability, thereby maintaining coordination while preserving flexibility.
Data Source
AI summary
The present invention provides one of embodiments comprising: receiving an upper layer signal including configuration information which indicates the size and use of the TxOP period in a primary cell (Pcell); receiving a scheduling grant including scheduling information on the TxOP period in a first subframe of the TxOP period; and transmitting and receiving data according to the use of the TxOP period on the basis of the scheduling information in a secondary cell (Scell) during the TxOP period, wherein the size of the TxOP period is defined by the number of subframes of the Scell and the use of the TxOP period is set by a downlink data transmission or an uplink data transmission, wherein whether the subframes of the Scell are included in the TxOP period can be determined according to a transmission direction of subframes of the Pcell corresponding to the subframe of the Scell.