License assisted access-WiFi coexistence with TXOP backoff for LTE in unlicensed band

摘要: License assisted access (LAA) was proposed as a solution to the challenge of satisfying high throughput requirement in cellular network with limited licensed band. LAA uses long term evolution (LTE) carrier aggregation technique combine and unlicensed bands, specifically 5 GHz WiFi band, order achieve data rates. However, has several critical concerns for services provision on In this article, an overview techniques concerning coexistence LTE same band is presented. We first present general approaches including power control evolved Node B (eNB), selection, duty cycling, self clear send (CTS) request send/CTS (RTS/ CTS), listen before talk (LBT). Then, we focus LBT LAA-WiFi discuss how based solutions can dynamically respond variations load ensure fair distributed manner. Based mechanism, also fairness-aware coexisting scheme TXOP (transmitted single transmission opportunity) backoff eNB. Finally, performances various are evaluated using Markov chain analytical model.