--- title: "Benefits of wireless communication and 4G" subject: "Wireless Communication" chapter: 1 key: "semester_7/wireless_communication:wireless-benefits-4g" source: https://www.bctengineer.com/q/semester_7/wireless_communication/wireless-benefits-4g site: BCT Engineering --- # Benefits of wireless communication and 4G Wireless Communication · Chapter 1: Introduction - Asked in: 2081 Bhadra, 2+4 marks - Video: [Wireless communication basics||Advantages||Applications](https://www.youtube.com/watch?v=oqyHvvElFek) — Sugandha Classes - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_7/wireless_communication/wireless-benefits-4g - Whole chapter: https://www.bctengineer.com/md/semester_7/wireless_communication/chapter-1 ## Question List major benefits of wireless communication. Give a brief description of the 4G wireless communication system. ## Short answer Wireless communication provides mobility, rapid deployment without cabling, wide coverage, scalability, and supports new services like IoT. 4G (IMT-Advanced/LTE-Advanced) is an all-IP network with OFDMA/SC-FDMA, MIMO, peak rates of 100 Mbps to 1 Gbps, and about 10 ms latency, enabling HD video and VoIP. ## Answer #### Major benefits of wireless communication - **Mobility** – users communicate while moving. - **No cabling** – faster and cheaper deployment, especially in hilly or remote areas such as rural Nepal. - **Wide coverage and accessibility** – voice, internet and banking reach places without wired infrastructure. - **Flexibility and scalability** – easy to add users and relocate equipment. - **Rapid disaster recovery** – temporary networks can be set up quickly. - **Supports new services** – IoT, location services, mobile payments. #### 4G wireless communication system 4G is the fourth generation of cellular systems defined by ITU as **IMT-Advanced**; the main standard is **LTE-Advanced** (3GPP), with WiMAX 2 as another candidate. **Requirements / features** - Peak data rates of about **100 Mbps for high mobility and 1 Gbps for low mobility**. - **All-IP packet-switched** network; voice carried as VoIP (VoLTE). - Latency about 10 ms; seamless handover with other networks. - Scalable bandwidth 1.4–20 MHz, aggregated up to 100 MHz. **Key technologies** - **OFDMA** in downlink and **SC-FDMA** in uplink (lower PAPR saves mobile battery). - **MIMO** (up to 8×8) for spatial multiplexing and diversity. - Adaptive modulation (QPSK–64/256 QAM), turbo coding, HARQ. - FDD and TDD modes. **Architecture (LTE / EPS)** ```text UE ── eNodeB ── S1 ── EPC | X2 ├─ MME (control, mobility) eNodeB ├─ S-GW (user data) └─ P-GW ── Internet ``` Only eNodeBs in the radio network (no RNC), giving a flat, low-latency design. Applications: HD video streaming, online gaming, video conferencing, mobile broadband (e.g. Nepal Telecom and Ncell 4G LTE). ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Why is wireless especially useful in hilly or remote areas such as rural Nepal? A. It needs no cabling, so deployment is faster and cheaper B. It always has higher data rate than fibre C. It never suffers interference D. It does not need a licence Answer: A. Avoiding cable laying reduces cost and time. (Key point: Benefit in remote areas) 2. What are the ITU 4G (IMT-Advanced) peak rates? A. 2 Mbps for all users B. 20 Gbps for all users C. 100 Mbps for high mobility and 1 Gbps for low mobility D. 384 kbps for all users Answer: C. IMT-Advanced targets 100 Mbps (high mobility) and 1 Gbps (low mobility). (Key point: 4G requirements) 3. Why does LTE use SC-FDMA in the uplink? A. Its low PAPR saves mobile battery B. It gives higher PAPR for more power C. It needs no synchronisation D. It removes the need for eNodeB Answer: A. Low peak-to-average power ratio makes the handset amplifier more efficient. (Key point: SC-FDMA) 4. In LTE, which element carries user data to the P-GW and what is absent? A. MME carries user data; RNC is present B. S-GW carries user data; no RNC in the radio network C. eNodeB carries user data; MME is absent D. P-GW controls mobility; S-GW is absent Answer: B. S-GW handles user data, MME control/mobility, and only eNodeBs exist in the RAN. (Key point: LTE architecture) ## Related in Wireless Communication - [3G versus 4G mobile communication](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3A3g-vs-4g) — Wireless Communication, chapter 1, asked 6× - [Regulatory issues in wireless communication](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Aregulatory-issues) — Wireless Communication, chapter 1, asked 6× - [Trends in wireless communication beyond 3G](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Atrends-beyond-3g) — Wireless Communication, chapter 1 - [Forward/reverse channel and 5G versus 4G](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Aforward-reverse-5g-vs-4g) — Wireless Communication, chapter 1, asked 2× - [Comparison of 1G to 4G mobile standards](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Agenerations-1g-to-4g-comparison) — Wireless Communication, chapter 1, asked 6× - [Short note: Wireless LAN (WLAN)](https://www.bctengineer.com/question.md?key=semester_7%2Fwireless_communication%3Awlan-short-note) — Wireless Communication, chapter 8 ## Related in other subjects - [Wired and wireless communication systems](https://www.bctengineer.com/question.md?key=semester_2%2Fbasic_electronics_engineering%3Awired-wireless-systems) — Basic Electronics Engineering, chapter 5, asked 2× - [Optical fibre system vs wireless](https://www.bctengineer.com/question.md?key=semester_6%2Fpropagation_and_antenna%3Aofc-working-vs-wireless) — Propagation and Antenna, chapter 6 - [Strategic information system and benefits](https://www.bctengineer.com/question.md?key=semester_8%2Finformation_system%3Astrategic-is-benefits) — Information System, chapter 1, asked 2× - [Major advantages of per unit system](https://www.bctengineer.com/question.md?key=semester_4%2Fpower_system_analysis_i%3Aper-unit-major-advantages) — Power System Analysis I, chapter 3