Enhancing Wireless Network Reliability with Positioning Solutions
Explore how positioning technologies improve wireless network reliability, reduce signal interference, and enhance roaming efficiency in IEEE 802.11-23/1159r0 discussions. The document delves into cases like spectrum management, location-based network management, and single-AP positioning capabilities, shedding light on the significance of accurate positioning for network optimization.
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July 2023 doc.: IEEE 802.11-23/1159r0 Discussions on CSI capture based positioning enhancement Date: 2023-07-06 Authors: Name Xiaokun Hu Affiliations Ruijie Networks Co., Ltd Address Phone email huxiaokun@ruijie.com.cn Lei Zheng Ruijie Networks Co., Ltd zhengl@ruijie.com.cn Jianxiang Chen Ruijie Networks Co., Ltd chenjianxiang@ruijie.com.cn Lihua zhu Ruijie Networks Co., Ltd zhulihua@ruijie.com.cn Lingwu Sun Ruijie Networks Co., Ltd sunlingwu@ruijie.com.cn Jian Xiang Ruijie Networks Co., Ltd xiangjian1@ruijie.com.cn Submission Slide 1 Xiaokun Hu, et al., Ruijie Networks Co., Ltd.
July 2023 doc.: IEEE 802.11-23/1159r0 Introduction UHR discussed various solutions to improve network reliability, such as using AP MLD and AIML to enhance roaming efficiency.[1][2][3] NGP, TGaz and TGbk have enumerated a number of positioning cases such as navigation in public buildings indoor geotagging robot positioning, agricultural IOT, position for electronic tag ,etc.[4] Some cases show that position information can help to improve the reliability of wireless networks: 1)Positioning for spectrum management, such as load balance and handover process. 2)Location Based Network Management. [4] Submission Slide 2 Xiaokun Hu, et al., Ruijie Networks Co., Ltd.
July 2023 doc.: IEEE 802.11-23/1159r0 Positioning help to increase reliability case --handover process In corner scenarios, the network quality may suffer due to the drastic reduction in RSSI. By calculating the location of STA, AP0 learns that STA is moving towards AP1 and increases the roaming threshold to trigger early roaming guidance. STA STA STA STA sta_aoa_t1 sta_aoa_t1 aoa2 aoa2 STA STA AP2 AP2 AP0 AP0 aoa1 aoa1 RSSI experiences RSSI experiences a sharp drop a sharp drop sta_aoa_t2 sta_aoa_t2 - -75dBm 75dBm AP1 AP1 Roaming point Roaming point Time or Distance Time or Distance Submission Slide 3 Xiaokun Hu, et al., Ruijie Networks Co., Ltd.
July 2023 doc.: IEEE 802.11-23/1159r0 Single-AP positioning STA STA In the previously mentioned scenario, it may be necessary for a single AP to have complete terminal positioning capabilities. d d Obviously in the right figure , the distance can be get from FTM. However, obtaining the azimuth angle or AOA worth further discussion. AP0 AP0 Submission Slide 4 Xiaokun Hu, et al., Ruijie Networks Co., Ltd.
July 2023 doc.: IEEE 802.11-23/1159r0 AOA needs AOA needs to switch the antenna array. AOA needs more antennas. T1 T1 T2 T2 T3 T3 T4 T4 active active active active active active active active 2 2 3 3 1 1 4 4 Antenna Antenna array array 6 6 7 7 5 5 8 8 11 11 12 12 10 10 9 9 15 15 16 16 13 13 14 14 SW3 SW3 SW4 SW4 SW1 SW1 SW2 SW2 AP AP Multi-antenna group switch and AoA measurement procedure [5]Jie Xiong Kyle Jamieson :ArrayTrack: A Fine-Grained Indoor Location System , UCL CS Research Note RN/11/19 Submission Slide 5 Xiaokun Hu, et al., Ruijie Networks Co., Ltd.
July 2023 doc.: IEEE 802.11-23/1159r0 Ranging NDP and Sounding procedure 11az and 11bf have also developed various procedures for channel estimation through NDP. [6] 11az has designed HE ranging NDP and HE trigger-based (TB) ranging NDP, which can improve the accuracy of channel and ToF estimation through HE- LTF repetition. Submission Slide 6 Xiaokun Hu, et al., Ruijie Networks Co., Ltd.
July 2023 doc.: IEEE 802.11-23/1159r0 Switch and call cost too much Switch and Measurement means multiple NDP---Ack processes are required over the air, which can significantly reduce the efficiency of air interface communication in high-density and multi-user scenarios. AP AP Time ANT Group1 Config ANT Group2 Config ANT Group3 Config CSI1 Measurement CSI2 Measurement NDP NDP ack ack STA STA Multi-antenna group switch and AoA measurement procedure Submission Slide 7 Xiaokun Hu, et al., Ruijie Networks Co., Ltd.
July 2023 doc.: IEEE 802.11-23/1159r0 Suggestion Refer to HE Ranging NDP, here is a suggestion for 802.11 PPDU ,Modified for antenna switch based AOA. Suggest to Add: AOA indicator in X-SIG field; HE-LTF Repetition Antenna Group Block in X-LTF field. AoA Indicator 8 s per HE-LTF symbol using 2x HE-LTF 4 s 4 s EH T EH T- - STF STF EH T EH T- -LTF U 1 U 1- -G 1 G 1- -A1 LTF A1 EH T EH T- -LTF U 1 U 1- -G 1 G 1- -A2 LTF A2 EH T EH T- -LTF U 1 U 1- -G 1 G 1- -B1 LTF B1 EH T EH T- -LTF U 1 U 1- -G 1 G 1- -B2 LTF B2 EH T EH T- -LTF U 1 U 1- -G 2 G 2- -A1 LTF A1 EH T EH T- -LTF U 1 U 1- -G 2 G 2- -A2 LTF A2 EH T EH T- -LTF U 1 U 1- -G 2 G 2- -B1 LTF B1 EH T EH T- -LTF U 1 U 1- -G 2 G 2- -B2 LTF B2 EH T EH T- -LTF U 2 U 2- -G 1 G 1- -A1 LTF A1 EH T EH T- -LTF U 1 U 1- -G 1 G 1- -A2 LTF A2 EH T EH T- -LTF U 2 U 2- -G 1 G 1- -A1 LTF A1 EH T EH T- -LTF U 1 U 1- -G 1 G 1- -A2 LTF A2 PE PE HE-LTF Repetition Block HE-LTF Repetition Block HE-LTF Repetition Block HE-LTF Repetition Block HE-LTF Repetition Block HE-LTF Repetition Block HE-LTF Repetition Antenna Group Block HE-LTF Repetition Antenna Group Block HE-LTF Repetition Antenna Group Block HE-LTF Repetition User Block HE-LTF Repetition User Block Submission Slide 8 Xiaokun Hu, et al., Ruijie Networks Co., Ltd.
July 2023 doc.: IEEE 802.11-23/1159r0 Suggestion Antenna Switch base AOA Measurement could be trigger by an AOA request from an AOA Initiator. Then the AOA responder send the modified AOA PPDU including AOA indicator and X-LTF repetition of antenna group block1~3. After sending each Antenna group block of X-LTF repetition, the AOA antenna array switch to the next ant-group state and waiting the next each Antenna group block of X-LTF repetition AP AP Time Switch Switch Ant Ant Group1 Group1 Switch Switch Ant Ant Group2 Group2 Switch Switch Ant Ant Group3 Group3 CSI1 CSI2 CSI3 Measurement Measurement Measurement AOA Request Including AOA indicator Including AOA indicator Ack AOA PPDU HE-LTF repetition HE-LTF repetition HE-LTF repetition STA STA HE-LTF Repetition Antenna Group Block3 HE-LTF Repetition Antenna Group Block2 HE-LTF Repetition Antenna Group Block1 HE-LTF repetition for Antenna Group Switch procedure Submission Slide 9 Xiaokun Hu, et al., Ruijie Networks Co., Ltd.
July 2023 doc.: IEEE 802.11-23/1159r0 Conclusion Positioning can assist in improving the reliability of wireless networks. AOA angle measurement can assist FTM positioning to further improve positioning accuracy. The new PPDU format can effectively improve the efficiency of CSI capture and AOA measurement. helpful for integrated sensing and communication (ISAC) Submission Slide 10 Xiaokun Hu, et al., Ruijie Networks Co., Ltd.
July 2023 doc.: IEEE 802.11-23/1159r0 References 1. 802.11-16/0137r4, NGP Use Case Template 2. 802.11-23/480r1, UHR proposed PAR 3. 802.11-22/1910r3, Seamless Roaming for UHR 4. 802.11-22/475r3, Proposed IEEE 802.11 AIML TIG Technical Report Text for the AIML-based Roaming Enhancements Use Case 5. Jie Xiong, Kyle Jamieson ArrayTrack: A Fine-Grained Indoor Location System , Usenix Conference on Networked Systems Design and Implementation. USENIX Association, 2013:71-84 6. Tanguy Ropitault, Claudio R. C. M. da Silva, Procedure: Enabling the Widespread Adoption of Wi-Fi Sensing IEEE 802.11bf WLAN Sensing Submission Slide 11 Xiaokun Hu, et al., Ruijie Networks Co., Ltd.
