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行動 WiMAX 系統設計最新動向. V.1.0 2008-10-30 環隆電氣 無線通訊產品事業處 劉尚淳. 行動 WiMAX 系統架構設計與規格剖析. 資料來源:資策會. WiMAX Devices Evolving. 目前 WiMAX 16e 技術上遇到的問題.

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Wimax

行動WiMAX系統設計最新動向

V.1.0 2008-10-30 環隆電氣

無線通訊產品事業處

劉尚淳


行動WiMAX系統架構設計與規格剖析

資料來源:資策會



Wimax 16e
目前WiMAX 16e 技術上遇到的問題

  • 從M-Taiwan & US Sprint Deployment Status 知道:

    • WiMAX骨幹 (Backbone)建設還未成熟

    • WiMAX 網路涵蓋範圍不夠廣

    • 基站 (BS ) 安裝密度不夠

    • 用戶端 (MS)的發射功率不夠大

    • 基站/用戶端 相容性(IOT)問題已逐漸解決, 所以使用在固定式(Fixed )的應用已沒甚問題,但Hand Over, HARQ, QoS, Network Management 還是使移動式(Mobility)沒法發揮16e的功效,這個問題尤其發生在大都會16e的佈建

    • 電源消耗功率 ( IC製程的演進及智慧型電源管理的應用 )

    • 導入16m and 16j 是否能加強16e 的功能


Wimax 16e1
目前WiMAX 16e 應用環境上遇到的問題

  • 在都會區的最後一哩面臨現有寬頻有線網路ADSL/FTTH/Cable Modem的競爭

  • 現有的 3G+卡產品, 如HSDPA, HSUPA, HSPA+也逐漸增強在資料Data上載/下載(Uplink/Downlink ) 的流量, 基站(Base Station )在這部份上的昇級也逐漸在進行, 其傳輸速度即可接近 WiMAX ( HSxPA現有 技術的延伸是3G 業者想採用的, LTE也是未來的4G標準 )

  • 受全球金融風暴, 經濟不景氣, Operator/Carrier也會拖延 WiMAX的怖建計劃, 消費者也會對新產品比較保守

  • WiMAX設備價格影響市場大小

  • WiMAX 相關應用的產品尚未到位



Future mobile technology 4g
Future Mobile Technology – 4G

Source: WiMAX Forum, 3GPP, 3GPP2,



16m technology overview
16m Technology Overview

  • Duplex scheme – Both TDD and FDD

  • Normalized peak data rate

    • DL >= 8.0 ( bps/HZ )

    • UL >= 2.8 ( bps/Hz )

  • Max. data latency – 10ms

  • Max. handover interruption time

    • Intra-frequency: 30ms

    • Inter-frequency: 100ms

  • Modulation

    • DL : QPSK/16QAM/64QAM

    • UL : QPSK/16QAM

  • Bandwidth ( BW ) – 5/10/20Mbps

  • Multi-antenna transmission

    • DL MIMO 2 x2 ( Matrix A & Matrix B )

    • B eamforming ( 2 x 2 )

    • UL Collaborative SM for two MSs with single antenna

  • Control Signaling

    • DL: Compressed MAP with sub-maps

    • UL: Initial/Periodic/Handover ranging, Bandwidth Request, Fast Feedback/CQI channel, Sounding


16m 16j
應該儘快導入16m & 16j

  • Multihop relay (MR) network has the following benefits:

    • Throughput Enhancement

    • Coverage Extension

    • Save MS Power

    • Load Balancing



Relay topology defined in 802 16j
Relay Topology (defined in 802.16j)

In-building Coverage

Coverage on Mobile Vehicle

Source : IEEE 802.16j TG


16j categories
16j Categories

  • Frame structure

  • Network entry / Connections & addressing

  • BW request

  • Construction & transmission of MAC PDUs

  • Measurement & reporting

  • Mobility management

  • RRM, Scheduling & Interference control

  • Security

  • HARQ

  • Modulation & coding, AAS / MIMO

  • Others: Definitions, Evaluation methodology

  • Hardware cost is similar with Mobile Station


Wimax1
WiMAX殺手級應用剖析

Source : XOHM

  • 2G/3G cellular + 16e 手持式 裝置

  • 持續取代傳統 MMDS/LMDS 與 Propriety BWA 的市場 ( 長距離 Backhual 應用 )

  • Mobile TV/ VoIP /Skype /Goggle Phone 的應用


Wimax2

AAA

PDG

WiMAX使用者及電信業者需求考量


Top 10 Worldwide 16e WiMAX Deployment Investment

.

9. Sacrtel

8. Enforta

7 Summa Telecom

US$100M

.KT Wirbo

1. Sprint

US$5,000M

3. KDDI

US$3,800M

2. Taiwan

US$660M

6. BSNL

US$1,000M

5.Bayannt Al-Oula

US$100M

7. Burraq

US$80M

10. Embratel

US$3,000M

4. TATA

Source: WiMAX Forum



4 angles to evaluate a technology
4 Angles To Evaluate A Technology

  • Spectral Efficiency

    • Increase without modifications to antenna systems

    • protocol and scheduling efficiency

  • License Bands

    • paired / unpaired, FDD / TDD, use of scattered allocations

Spectrum

Capacity

1

Coverage

  • Compatible dimensions and frequency bands

  • MIMO systems

    • Space Time Coding (STC) to increase range

    • Spatial Multiplexing (SM) to increase capacity

  • Smart Antennas

2

Antennas

Complexity

3

  • Operator Profile

    • Greenfield or existing network

  • Area Profile

    • Urban/suburban/rural

    • Indoor hot spots (pico / femto cells)

Sites

Cost

4

*Source: “Next Generation Mobile Networks”, NGMN White Paper, Dec. 2006


Technology choices
Technology Choices

LTE is targeted to exceed HSPA and mobile WiMAX in all aspects, but now WiMAX and HSPA still have advantage in timing leading

1

2

3

4

Source:

2008 WPBU “4G technology” by Ace;

2007 Altran Technology & Media, A Consulting Firm founded by MIT professor Arthur Dehon Little


Conclusion technology
Conclusion – Technology

  • WiMAXhas advantage in capacity limited scenarios

    • higher peak data rate

    • higher spectral efficiency

    • higher average date rate available per user

  • HSPA has advantage in coverage limited scenarios

    • greater link budget and MAPL

    • greater cell range and area

    • more users covered per cell/sector

  • LTEaims at gaining advantage over HSPA and mWiMAX in all areas – capacity, coverage and complexity

  • All three technologies have their place and will co-exist in the mid-term, but 3GPP driven technologies appear firmly in the lead

  • Improvements in technology performance and resulting link budget (e.g. 802.16m) can give advantage to WiMAX particularly for Greenfield operators – but LTE will have advantage of 3GPP heritage

  • 3GPP and 3GPP2 networks will migrate towards OFDMA technology (e.g. LTE, CDMA Rev. C)


Wimax3
行動WiMAX新興市場商機

  • 第三世界國家, 寬頻基礎缺乏, 即需 WiMAX當作經濟實用的Internet網路, 又俱有 VoIP與QoS的功能

  • 發展中國家, 有線寬頻建設來不及, 直接切入WiMAX網路是最快又最有效建置

  • 已發展中國家, WiMAX提供給第二類電信業者一個與3G業者競爭業務的機會

  • 對工業國家或極度開發國家, WiMAX是一個選項, 可有可無.但WiMAX就像是” 鄉村包圍城市” 的產業,如果能風雲湧起, 未來必也能帶來一番榮景.


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