IEEE 802.16-12-0533-0102-000q
Project / IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16Title / Proposed System Requirements on Base Station Power Management for IEEE 802.16q Networks
Date Submitted / 2012-09-1718
Source(s) / Anseok Lee, Eunkyung Kim, Jaesun Cha, Wooram Shin, Kwangjae Lim
ETRI / E-mail:
*<http://standards.ieee.org/faqs/affiliationFAQ.html
Re: / “IEEE 802.16-12-0507-02-Shet,” in response to Call for Contributions: Multi-Tier Networks IEEE 802.16 Working Group on System Requirmeent of Multi-tier Networks
Abstract / System Requirement of Multi-tier Networks on Base Station Power Management
Purpose / To discuss and adopt the proposed text in the System Requirement Document (SRD) on IEEE P802.16q Multi-tier Networks
Notice / This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein.
Release / The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.16.
Patent Policy / The contributor is familiar with the IEEE-SA Patent Policy and Procedures:
http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat>.
Proposed System Requirements on Base Station Power Management for IEEE 802.16q Networks
Anseok Lee, Eunkyung Kim, Jaesun Cha, Wooram Shin, Kwangjae Lim
ETRI
Introductions
The IEEE 802.16q system is an amendment of the IEEE 802.16 system to support enhanced cooperation among base stations in multi-tier networks for enhanced interference mitigation, mobility management, and base station power management. This contribution is for identifying the system requirements of IEEE 802.16q system from the point of view of base station power management.
The legacy cellular system such as IEEE 802.16 and IEEE 802.16.1 systems designed for supporting maximum throughput without considering the power consumption of base stations. However, rising energy prices increases the operating cost of the mobile network operator (MNO). The energy expenses of total network operational cost is around 18 percent in European markets and even more in developing contries [3].
Not only the mobile network operatior but the users who installed the small cell base stations for personal and/or office shall charge the energy expenses by the user installed small base stations. The increasing energy prices may be one of the obstables in deployments of user installed small base stations.
Requirements for the IEEE 802.16q on Base Stations Power Management
Cooperation of base stations for power saving
In the urban environment, the cell is deployed densely to support extensive number of users and/or demand of traffic in the peak hours. And therefore coverage of each base stations may be overlapped with adjacent base stations. The power mangement of base station shall have greater gain when the number of user is small or traffic demand is low. In the low-demand duration as in the abobe example, some base stations can turn off theire RF transciever to save evergy.
Figure 1. Power Saving Operation of Macro Base Stations
In some scenario, some portion of macro base stations can turn off their RF transciever without bringing coverage hall. In the other example, small base stations, such as femto and pico base stations, can be turned off without decreasing performance of the networks.
Figure 2. Power Saving Operation of Small Base Stations
The possibility of turning off RF transciever can be detected by communicating with adjacent base stations. This requires the cooperation of adjacent base stations including macro and small base stations for power savings. Turning off RF transcirever of some base stations may be related with many problems. One of most significant problem is association of users under the base stations which going to be turned off its RF transceiver.
Power saving operation mode of base stations
In the legacy specification, the base stations does not support power saving operational mode such as idle mode operation as in the mobile stations. To achieve energy saving of base stations power saving operational mode of base station need to be supported. One of typical power saving operational mode is duty-cycled operation which composed of active and inactive time period.
To achieve The duty-cycled mode in multi-tier network shall support multiple level of duty-cycles. For example, long inactive period may be required for turning-off of RF transciever in low user and/or traffic time (e.g. several hours). And short inactive period (e.g. several frames) may ber required for energy saving or lowering interference level in day-time operations.
The duty-cycled operation also requires event-triggered fast recovery from inactive period to prevent the failures of users in inactive periods. The events shall be includes increased number of users or traffic demands. The event detection shall be done by the base stations in inactive period or also by the adjacent base stations.
The user and load distribution may be changed by the time and location. To achieve power saving, the base stations need to change the configuration of power saving operation (i.e. duty-cycled operation) for changing user and/or load distributions.
References
[1] IEEE 802.16-12-0394-05-Gdoc, PAR and Five Criteris for P802.16q on a Multi-tier Amendment to IEEE Std 802.16, July 2012.
[2] IEEE 802.16-12-0136-00-Gdoc, Hierarchical Network Study Report, January 2012.
[3] D. Lister, “An Operator’s View on Green Radio,” Proc. IEEE Internat. Conf. on Commun. Workshops (ICC Workshops ‘09), 1st Internat. Workshop on Green Commun. (GreenComm ‘09) (Dresden, Ger., 2009).
Proposed Text on SRD of IEEE 802.16q
[------Start of Text Proposal------]
1 Functional Requirement
1.1 Base Station Power Management
1.1.1 The 802.16q system shall support cooperation of adjacent base stations for energy saving of base stations.
1.1.1.1 The 802.16q system shall support mangement information exchange among adjacent base stations for power saving.
1.1.1.2 The 802.16q system shall support coordinated association of users for power saving operation of base stations
1.1.2 The 802.16q system shall support additional operation mode of base stations for power saving of base stations.
1.1.2.1 The 802 .16q system shall support additional operational mode with minimum impact on operations of usersmobile stations.
1.1.2.2 The 802 .16q system shall support duty-cycled operation of base stations.
1.1.2.3 The 802 .16q system shall support transition to/from inactive period in duty-cycled operation, triggered by adjacent BSs.
1.1.2.4 The 802.16q system shall support adaptive configuration of power saving operation according to various metric (e.g. number of users).
[------End of Text Proposal------]