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實驗四 多媒體影音串流的卸載與負載分享

教育部行動寬頻尖端技術人才培育計畫 - 小細胞基站聯盟 中心 「小基站與 WiFi 之異質性網路存取」課程 模組 使用 ITRI LWA-Small Cell ( 含 WiFi) 實驗平台. 實驗四 多媒體影音串流的卸載與負載分享. 助理教授：吳俊興 助教：吳振宇 國立 高雄大學 資訊工程學 系. Outline. 實驗目的及實驗內容 Introduction PDCP Spec. Changes for LWA LWA RRC/RRM LWA General RRC Procedures LWA Environment Setup LABs. 實驗目的.

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實驗四 多媒體影音串流的卸載與負載分享

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  1. 教育部行動寬頻尖端技術人才培育計畫-小細胞基站聯盟中心教育部行動寬頻尖端技術人才培育計畫-小細胞基站聯盟中心 「小基站與WiFi之異質性網路存取」課程模組 使用ITRI LWA-Small Cell (含WiFi) 實驗平台 實驗四多媒體影音串流的卸載與負載分享 助理教授：吳俊興 助教：吳振宇 國立高雄大學 資訊工程學系

  2. Outline • 實驗目的及實驗內容 • Introduction • PDCP Spec. Changes for LWA • LWA RRC/RRM • LWA General • RRC Procedures • LWA Environment Setup • LABs

  3. 實驗目的 • 學生得以了解各種網路效能指標之意義 • 使用現有工具軟體量測網路效能、培養解讀量測數據之能力 • 培養學生在ITRILWA-Small Cell實驗平台上實作影音串流的卸載與負載分享等相關的程式實作技術

  4. 實驗內容 • 設置ITRISmall Cell與WiFi環境 • ITRISmall Cell軟體安裝與執行 • HTC U Play手機設置 • 觀察Attach與Dettach訊息 • 觀測訊號品質與影音串流

  5. Outline • 實驗目的及實驗內容 • Introduction • PDCP Spec. Changes for LWA • LWA RRC/RRM • LWA General • RRC Procedures • LWA Environment Setup • LABs

  6. Introduction • Dual Connectivity (DC) in Rel. 12 • Increase UE throughput especially for cell edge UEs • Mobility robustness enhancement • Reducing signaling overhead towards the CN due to handover (Network and Protocol Architecture)

  7. Introduction (cont.) • Qualcomm and Intel proposed the LTE-WLAN Aggregation (LWA) in Rel. 13 in 3GPP Technical Specification Group (TSG) plenary meeting RP-67 held on March. 2015 in Shanghai • Dynamic allocation of resources based on radio and load condition • Higher aggregated user throughput & system throughput • Unified network control and management • RAN-level seamless handover

  8. Introduction (cont.) • In Taiwan, ITRI, MTK, and CHT are interested in LWA • ITRI is responsible for the LTE base station, while MTK handles the mobile phone • CHT provides the core network and its WiFihotspots

  9. LWA Protocol Architecture • Downlink Transmission only in Rel. 13 • Collocated Scenario: • Non-collocated Scenario:

  10. LWAAP (DRBID addition) How to handle the mapping between LTE and WLAN ?  LWAAP adds DRB ID RLC has known the mapping relation between logical channel and data radio bearer

  11. EtherType How to determine the WLAN packet shall be handled by the PDCP or IP layer ?  EtherType

  12. Interface between eNB and Wi-Fi AP • Interface between LTE eNB and WLAN AP P. Nuggehalli, “LTE-WLAN Aggregation [Industry Perspectives],” IEEE Wireless Communications, Vol. 23, no. 4, pp. 4-6, August 2016.

  13. Outline • Introduction • PDCP Spec. Changes for LWA • LWA RRC/RRM • LWA General • RRC Procedures • LWA Environment Setup • LABs

  14. Specification Changes – PDCP • PDCP routing/reordering (PDCP functional view)

  15. Specification Changes – PDCP (cont.) • PDCP sequence number extension: 12/15/18 bits • PDCP control PDU FMS: First Missing PDCP SN HRW: Highest Received PDCPSN on WLAN NMP: Number of Missing PDUs 0b000 0b010 (PDCP status report) (LWA status report) (PDCP functional view)

  16. Specification Changes – PDCP (cont.) • PDCP timers • Reordering timer • PDCP status report timer • LWA status report timer

  17. Outline • Introduction • PDCP Spec. Changes for LWA • LWA RRC/RRM • LWA General • RRC Procedures • LWA Environment Setup • LABs

  18. RRC/RRM • LWA General (36.300) • Mobility Set • WLAN Measurement • WLAN Connection Status Reporting • Feedback Information • RRC Procedures (36.331) • UE Capability • LWA DRB Setup • WLAN Measurement Configuration and Report • LWA Activation • LWA WLAN Mobility • LWA Deactivation • ITRI LWA RRM Flowchart

  19. Outline • Introduction • PDCP Spec. Changes for LWA • LWA RRC/RRM • LWA General • RRC Procedures • LWA Environment Setup • LABs

  20. LWA General (TS 36.300 22A.1.4 ~ 22A.1.6) • Mobility Set • WLAN Measurement • WLAN Connection Status Reporting • Feedback Information

  21. Mobility Set • A WLAN mobility set • A set of one or more WLAN Access (APs) identified by one or more BSSID/HESSID/SSIDs • All APs belonging to a mobility set share a common WT • The UE may perform mobility between WLAN APs belonging to the mobility set without informing the eNB Ref : 3GPP R2-153689

  22. WLAN Measurement • The UE supporting LWA may be configured by the E-UTRAN to perform WLAN measurements • WLAN measurements may be configured to support • LWA activation • Inter WLAN mobility set mobility • LWA deactivation

  23. WLAN Connection Status Reporting (1) • WLAN Connection Status Reporting procedure • Purpose : Provide feedback to the eNB related to the WLAN status and operation • Supported indications • WLAN connection success. • successfulAssociation • WLAN connection failure • WLAN radio link issues /UE internal problems/failureTimeout TS 36.331

  24. WLAN Connection Status Reporting (2) • The criteria to determine WLAN connection failure is left for UE implementation • Upon WLAN connection failure, • No UE RRC connection re-establishment is triggered • Data reception on WLAN is suspended • No impact to LTE part of the LWA split bearer TS 36.331

  25. Feedback Information • Xw-Feedback : • XwAP WT STATUS REPORT, Downlink Data Delivery Status • UE-Feedback : • PDCP and LWA status report, RRC WLAN measurement report

  26. Outline • Introduction • PDCP Spec. Changes for LWA • LWA RRC/RRM • LWA General • RRC Procedures • LWA Environment Setup • LABs

  27. RRC Procedures (TS 36.331) • UE Capability • LWA DRB Setup • WLAN Measurement • LWA Activation • LWA WLAN Mobility • LWA Deactivation

  28. UE Capability LWA-Parameters-r13

  29. LWA Data Bearer Setup (1) LWA Bearer only support RLC AM (TS 36.300 6.3 PDCP sublayer)

  30. LWA Data Bearer Setup (2) Choice setup of statusFeedback polling Perio-dical

  31. WLAN Measurement Configuration and Report

  32. WLAN Measurement (1) • MeasObjectWLAN • Specifies information applicable for inter-RAT WLAN measurements • E-UTRAN configures at least one WLAN identifier

  33. WLAN Measurement (2) • 2 types of ReportConfig for WLAN • Periodical • Event triggered : W1, W2, W3

  34. WLAN Measurement (3) • MeasResultWLAN-r13

  35. LWA-Configuration (1) • The IE LWA-Configuration is used to setup/modify/release LTE-WLAN aggregation

  36. LWA-Configuration (2) • lwa-MobilityConfig (WLAN-MobilityConfig-r13)

  37. LWA Activation LWA-config-r13 { wlanToAdd, associateTimer, successReportRequested} WLAN-Status-r13: successfulAssociation (0) / failureWlanRadioLink (1)/ failureWlanUnavailable(2)/failureTimeout(3)

  38. WLAN Mobility

  39. LWA Deactivation

  40. File : enbd_lwa_config RRM LWA Parameters • WLAN AP list • Procedure thresholds

  41. enbd_lwa_config

  42. LWA RRM Flowchart

  43. Outline • Introduction • PDCP Spec. Changes for LWA • LWA RRC/RRM • LWA General • RRC Procedures • LWA Environment Setup • LABs

  44. LTE-WLAN Aggregation (LWA) Setup • Hardware setup • Software install • LWA UDCell execution • HTC U Play phone setting • MCS and LWA ratio modification

  45. Hardware Setup power supply eth1 eth0

  46. Software Install • Uncompressed “itriUDCell_20170830released.tgz” • images: LTE L1/L2/L3 images • mmed: LTE MME • sgw: LTE serving gateway • net_cfg: Lite-EPC network config • scripts • UDcell.py • Modify the loc_dir of UDCell.py

  47. Software Install (cont.) • Lite-EPC network configuration • $ sudo python UDcell.py • Choice 1 • Wi-Fi AP BSSID/SSID configuration • In itriUDCell_20170830released folder • Edit ./images/l3_images/enbd_lwa_config

  48. Software Install (cont.) • LWA trigger threshold • In itriUDCell_20170830released folder • Edit ./images/l3_images/enbd_lwa_config • Hint：Use tools to measure Wi-Fi RSSI

  49. Software Install (cont.) • Put images to ITRI UDCell • Turn on UDCell and wait for it to boot up (ping 192.168.10.1) • $ python UDcell.py • Choices 3 and 4

  50. Software Install (cont.) • Serving gateway configuration • In itriUDCell_20170830released folder • Edit ./sgw/wan_conf

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