Base Station Contention Window Adjustment for Unlicensed Bands
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Solution Overview
Problem
In LTE communication systems, managing a contention window on unlicensed bands is challenging due to ambiguous standards when receiving response signals from multiple UEs simultaneously, leading to inefficient channel occupancy operations.
Innovation Solution
A method and apparatus for managing a contention window by transmitting multiple data in a first subframe, receiving response signals, determining the ratio of NACK signals to response signals, and adjusting the contention window based on this ratio to optimize channel occupancy on unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station receives response signals from multiple UEs simultaneously, then the channel occupancy operation can proceed, but the standard becomes ambiguous leading to inefficient operations
Solution Approach 1:
The patent segments the response signals by associating each response signal with specific transmitted data through downlink resource allocation information. The base station divides the set of response signals into groups, each corresponding to specific data transmissions, allowing clear identification and processing of each signal without ambiguity.
Solution Approach 2:
The patent implements a feedback mechanism where the base station transmits downlink resource allocation information to UEs, and UEs provide feedback in the form of response signals (ACK/NACK). This structured feedback loop allows the base station to clearly interpret response signals by referencing the previously transmitted resource allocation information, resolving ambiguity in simultaneous signal reception.
2Productivity
If the contention window is adjusted based on NACK ratio, then channel utilization improves, but the complexity of managing contention window increases
Solution Approach 1:
The base station performs autonomous contention window adjustment by automatically calculating the NACK ratio from received response signals and modifying the contention window size accordingly. This self-service mechanism eliminates the need for external intervention or complex coordination, simplifying the overall management while improving channel utilization through adaptive adjustment.
Data Source
AI summary
A base station is provided. The base station transmits multiple data in a first subframe, receives response signals corresponding to the multiple data, determines a ratio of negative acknowledge (NACK) signals to the response signals, and adjusts or maintains a contention window based on the determined ratio. The present disclosure relates to communication schemes for combining 5th-generation (5G) communication systems with internet of things (IoT) technology to support higher data transmission rate as post-4th-generation (post-4G) systems and systems for the same. The present disclosure may be used in intelligent services (e.g., smart home, smart building, smart city, smart car, or connected car, health-care, digital education, retail business, security and safety-related services, etc.) based on the 5G communication technology and IoT-related techniques.