1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: Proposal of priority-based CSMA/CA for LPWA
Date Submitted: 7 September, 2018
Source: Kunmin Yeo, Tae-Joon Park, Seong-Soon Joo
Company: ETRI
Address: 218 Gajeong-ro, Yuseong-gu, Daejeon, 34129, KOREA
Voice: ,
Re: IEEE P w Low Power Wide Area Call for Proposals, 12 March 2018
Abstract: This is a proposal of priority-based CSMA/CA for large-scale populated LPWA services.
Purpose: Contribution to IEEE w
Notice: This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. This work was supported by IITP funded by MSIT (No. R , LPWA IoT network core technology development).
Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P
<author>, <company>

2. Priority-Based CSMA/CA for LPWA
<month year>
doc.: IEEE <doc#>
Priority-Based CSMA/CA for LPWA
Kunmin Yeo, Tae-Joon Park, Seong-Soon Joo
ETRI
<author>, <company>

3. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
Contents
CCA for Korean Frequency Regulations
IFS and BE for Priority-Based CSMA/CA
<author>, <company>

4. Korean Frequency Regulations for LPWA (I)
<month year>
doc.: IEEE <doc#>
Korean Frequency Regulations for LPWA (I)
262 MHz ~ 264 MHz : Newly assigned
Max. ERP : 100mW
Max. channel bandwidth : 200kHz
Duty cycle limit. : 1 %
940.1 MHz ~ MHz : Newly assigned
Max. ERP : 200mW
Duty cycle limit. : 0.1% / hour
917 MHz ~ MHz
Most popular in KOREA.
IEEE g, IEEE k
[1] Tae-Joon Park et al., “Korean Frequency Regulations for LPWA,” 15-17/153r0, 2017.
<author>, <company>

5. Korean Frequency Regulations for LPWA (II) 917 MHz ~ 923.5 MHz
<month year>
doc.: IEEE <doc#>
Korean Frequency Regulations for LPWA (II) 917 MHz ~ MHz
4 classes of maximum effective radiated power
Output control
Case 1) Frequency hopping
Use at least 16 or more non-duplicated channels
Maximum hopping time : 0.4 sec
Case 2) LBT AFA
Carrier sense 5ms or more
at -65dBm or less
Sending duration : 4sec or less
Pause duration : 50ms or more
Case 3) Duty cycle limitation
~ 10mW : Below 2% in 20sec duration
10mW ~ 25mW : Below 1% in 40sec duration
25mW ~ : Below 0.5% in 80sec duration
[1] Tae-Joon Park et al., “Korean Frequency Regulations for LPWA,” 15-17/153r0, 2017.
<author>, <company>

6. Domestic Constraints on 917 MHz
<month year>
doc.: IEEE <doc#>
Domestic Constraints on 917 MHz
Frequency Hopping
Different Max. ERP on four group channels
3, 10, 25, 200 mW
Difficult to use consecutive channels for FHSS
Listen Before Talk
Carrier sense 5ms or more
at -65dBm or less
Sending duration : 4sec or less
Pause duration : 50ms or more
The current LoRaWAN specification in KOREA exclusively uses LBT channel access rule
to maximize MACPayload size length and comply with the South Korea regulations.
<author>, <company>

7. CCA Proposals for Korean Frequency Regulations
<month year>
doc.: IEEE <doc#>
CCA Proposals for Korean Frequency Regulations
Amend the CCA for LPWA
Modify the sub-section of IEEE
Receiver ED
The minimum ED value (zero) shall indicate received power less than 10 dB above the lowest specified receiver sensitivity, in dBm, for the PHY except for the 917MHz band. The minimum ED value of 917MHz band shall be -65 dBm or less.
Clear channel assessment (CCA)
a) Except for the SUN O-QPSK PHY and the 917MHz band PHYs, the ED threshold shall correspond to a received signal power of at most 10 dB greater than the specified receiver sensitivity for that PHY, or in accordance with local regulations. For the SUN O-QPSK PHY, the ED threshold shall comply with the specification in For the 917MHz band PHYs, the ED threshold shall be -65 dBm or less.
b) Except for the 917 MHz PHYs, 920 MHz band PHYs, and the RCC PHYs, the CCA detection time shall be equal to aCcaTime, as defined in Table For the 920 MHz band, and the RCC PHYs, phyCCADuration symbol periods shall be used. For the 917 MHz band PHYs, the CCA detection time shall be equal to 5ms or more.
<author>, <company>

8. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
Contents
CCA for Korean Frequency Regulations
Prioritized IFS and BE for CSMA/CA
<author>, <company>

9. Large-scale Populated Services(I)
<month year>
doc.: IEEE <doc#>
Large-scale Populated Services(I)
Large-scale populated services with reliable and secure services
Public Services: Critical facility monitoring, Public Infrastructure monitoring, Children Guardians
Industrial Services: Process monitoring, Smart Building
Urban Information System
PHY for Korea LPWA
FSK of LECIM …
<author>, <company>

10. Large-scale Populated Services(II)
<month year>
doc.: IEEE <doc#>
Large-scale Populated Services(II)
Priority based random access for CAP
Active Interfering Users per Timeframe
The number of active users in a given network cell
Interfering users may also originate from different uses-cases (e.g. for application area smart city)
Channel access control for heterogeneous traffic
Dynamic channel access control
LPWA need a priority-based CSMA/CA
Source : lpwa-use-cases-and-technical-requirements-for-lpwa-networks
[2] Tae-Joon Park et al., “Proposal for Suitability Analysis of IG LPWA Report,” 15-17/0155r01, 2017
<author>, <company>

11. Large-scale Populated Services(III)
<month year>
doc.: IEEE <doc#>
Large-scale Populated Services(III)
[2] Tae-Joon Park et al., “Proposal for Suitability Analysis of IG LPWA Report,” 15-17/0155r01, 2017
<author>, <company>

12. Proposals for Priority-Based CSMA/CA
CSMA-CA algorithm
Add the following paragraph
In a LPWA PAN, if macBeOffsetEnabled is set to TRUE, an additional constant delay (macBeOffset) shall be required before locating backoff period delay illustrated in Figure 6-5.
8.4.2 MAC PIB attributes
Add the following attributes in Table 8-81
Attribute
Type
Range
Description
Default
macBeOffsetEnabled
 Boolean
 TRUE, FLASE
Indication of whether an additional constant delay (macBeOffset) is required before locating backoff period delay
 FALSE
macBeOffset
 Integer -
The required delay before locating backoff period delay