1. Submission doc.: IEEE 802.19-15/0092r0 Chen Sun, Sony ChinaSlide 1 Adjustment of energy detection threshold over IP-network Date: 2015-11-06 Authors: November 2015

2. Submission doc.: IEEE 802.19-15/0092r0 November 2015 Chen Sun, Sony ChinaSlide 2 Abstract This document provides the analysis of the effect of controlling the energy detection threshold over IP- network for coexistence.

3. Submission doc.: IEEE 802.19-15/0092r0November 2015 Chen Sun, Sony ChinaSlide 3 Background There is a potential that different wireless systems will operate in the same frequency band For example, the TV band, 3.5GHz in US and the 5GHz band These different wireless systems might use different radio access technologies. IEEE 802.19.1 or its enhanced system (802.19.1a) can manage these different wireless systems together for coexistence over IP-network. In many cases, most of these wireless systems employ functionality of energy detection CCA. Generally, it is obvious that the value of energy detection threshold affects the performance of wireless systems. In such case, there might be merit that we adjust the performance of the wireless systems by controlling the energy detection threshold over IP- network. We analyzed this possibility with simulation.

4. Submission doc.: IEEE 802.19-15/0092r0 Simulation model Slide 4Chen Sun, Sony China November 2015 Operator 1 Operator 2 Macro eNB

5. Submission doc.: IEEE 802.19-15/0092r0 Evaluation scenarios 1.Each devices uses fixed energy detection threshold. 2.Each devices uses energy detection threshold calculated and provided by the coexistence system, where the value is the same among all the devices. 3.Each devices uses energy detection threshold calculated and provided by the coexistence system, where the value is different among all the devices. Slide 5Chen Sun, Sony China November 2015

6. Submission doc.: IEEE 802.19-15/0092r0 Simulation Parameters Layout/Deployment Hexagonal grid, 3 sectors per site, Radius 250m/site ， Clusters uniformly random within macro geographical area; 10 small cells per operator, uniformly random dropping within the cluster area. Radius for small cell dropping in a cluster: 75m Radius for user dropping in a cluster: 85m Number of channels1 System bandwidth per carrier20MHz Carrier frequency5GHz Total TX powerOperator 1: 18dBm ; Operator 2:17dBm Antenna Height 10m UE antenna Height 1.5m Antenna pattern2D Omni-directional Antenna gain + connector loss5dBi Distance-dependent path lossSmall cell-to-Small cell, Small cell-to-UE: ITU Umi [Table B.1.2.1-1 in TR36.814] Penetration0 dB ShadowingITU UMi [Table B.1.2.1-1 in TR36.814] Minimum distance (2D distance) Small cell-small cell: 20m Inter-operator small cell-small cell: 10 m Small cell-user, user-user: 3m cluster center-cluster center: 2*Radius for small cell dropping in a cluster Slide 6Chen Sun, Sony China November 2015

7. Submission doc.: IEEE 802.19-15/0092r0 Slide 7Chen Sun, Sony China November 2015 Effect of small cell activation probability on the status of grabbing the channel on unlicensed band Operators taking the same ED Threshold (-87 dBm for Operator 1 and -62dBm for Operator 2) but different small cell activation rate, i.e. 30%, 50% and 80% In terms of getting the opportunity to grab the channel, even two operators taking the same ED Threshold value, however, with activation rate increasing, it having positive impact on the one choosing relevant relaxed ED Threshold and slightly negative impact on the one choosing relevant tighten threshold. Activation rate increasing

8. Submission doc.: IEEE 802.19-15/0092r0 Slide 8Chen Sun, Sony China November 2015 Effect of Energy Detection Threshold on the status of grabbing the channel on unlicensed band Operators taking the same activation rate (50%) with different ED Threshold respectively Operator 1: -62dBmOperator 2: -62dBm) Operator 1: -97dBmOperator 2: -62dBm) Operator 1: -102dBmOperator 2: -62dBm) Operator 1: ED Threshold decreasing Operator 2: ED Threshold fixed in a relevant high value In terms of getting the opportunity to grab the channel, even two operators taking the same activation rate, however, with ED Threshold going lower, it having significant impact on the chance to sense the channel to be idle

9. Submission doc.: IEEE 802.19-15/0092r0 Slide 9Chen Sun, Sony China November 2015 Histogram of small cells that can transmit showing the effect of Energy Detection Threshold on the status of grabbing the channel on unlicensed band Operators taking the same activation rate (80%) with different ED Threshold respectively Operator 1: -62dBm Operator 2: -62dBm) Operator 1: -97dBm Operator 2: -62dBm) Operator 1: -102dBm Operator 2: -62dBm) In terms of getting the opportunity to grab the channel, even two operators taking the same activation rate, however, with ED Threshold going lower, it having significant impact on the chance to sense the channel to be idle and with higher activation rate, the influence even severe compared with the case taking the activation rate of 50%. Operator 1: ED Threshold decreasing Operator 2: ED Threshold fixed in a relevant high value

10. Submission doc.: IEEE 802.19-15/0092r0 Effect of energy detection threshold on the network capacity Slide 10Chen Sun, Sony China November 2015 Operator 1: Performance decreasing significantly with lower detection threshold. Operator 2: The performance is improved due to the ED detection threshold adjustment at the operator 1

11. Submission doc.: IEEE 802.19-15/0092r0 Slide 11Chen Sun, Sony China November 2015 Sensing threshold of operator 1 are randomly selected from [-107 -62] Sensing threshold of operator 1 are randomly selected from [-107 - 62]+10dB Sensing threshold of operator 1 are randomly selected from [-107 -62]- 10dB Sensing threshold of operator 2 are randomly selected from [-107 -62] When the sensing threshold is increased at operator 1, the probability of getting channel is increased whereas the probability is slightly decreased.

12. Submission doc.: IEEE 802.19-15/0092r0 Effect of energy detection threshold on the network capacity Slide 12Chen Sun, Sony China November 2015 Operator 1: Performance decreasing significantly with lower detection threshold. Operator 2: The performance is improved due to the ED detection threshold adjustment at the operator 1.

13. Submission doc.: IEEE 802.19-15/0092r0 Observations By changing the detection threshold of energy detection, the spectrum utilization can be adjusted. For the coexistence management of different systems, the IEEE 802.19 system can adjust the detection thresholds for different systems. Slide 13Chen Sun, Sony China November 2015

14. Submission doc.: IEEE 802.19-15/0092r0November 2015 Chen Sun, Sony ChinaSlide 14 References [1] LTE-LAA 3GPP Document 36.889-011