22100084030000proposedresolutionstocommentsrelatedtosection9.docx

1、22100084030000proposedresolutionstocommentsrelatedtosection9IEEE P802.22Wireless RANsProposed Resolutions to Comments Related to Section 9 Draft v3.0Date: 2010-06-18Author(s):NameCompanyAddressPhoneemailApurva ModyBAE Systems404-819-0314apurva.modyapurva_modyGerald ChouinardCRCGerald.chouinardcrc.ca

2、Ranga ReddyUS ArmyRanga.reddyus.army.milNotice: This document has been prepared to assist IEEE 802.22. 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

3、 study. The contributor(s) 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 publ

4、ication; to copyright in the IEEEs name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEEs sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts

5、that this contribution may be made public by IEEE 802.22.Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures , including the statement IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives

6、 assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard. Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for del

7、ays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair Apurva N. Mody as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated in

8、to a draft standard being developed within the IEEE 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at .AbstractThe following document proposes resolutions to comments related to the Section 9. 9 Cognitive Radio Capability9.1 GeneralThis clause describes

9、the cognitive radio capabilities supported by the 802.22 standard, which are required to meet regulatory requirements for protection of incumbents as well as to provide for efficient operation of 802.22 networks. The cognitive radio capabilities include: BS Spectrum Manager (SM), Spectrum Sensing Au

10、tomatons (SSA), Access to the Incumbent Database Services, Policy (Table 255 and Annex A), CPE Registration and Tracking, Spectrum Sensing Services and Geolocation Services.802.22 devices shall employ cognitive radio capability, which shall enable them to make decisions about their radio operating b

11、ehavior based on information from various sources such as sensing, geolocation, the database service, policy etc. The information shall be obtained through communication with external incumbent databases, or through direct sensing for incumbents on TV channels that would be impacted by operation of

12、the 802.22 device, or both. The information shall also be the result of rules governing the particular regulatory domain where the device intends to operate (e.g. certain TV channels may be “off limits” because they were allocated for some other specific use). This clause defines the 802.22 function

13、al entities, information elements, and procedures related to obtaining and managing this information.The 802.22 device shall retrieve appropriate spectrum availability information based on the geographic coordinates of its intended operating location from an external database service, as described b

14、y procedures defined in this clause.An 802.22 device shall also sense for the presence of incumbents in areas where the 802.22 device intends to operate, both prior to, and during operation. This includes sensing the prospective TV channels of operation as well as any other TV channels that might be

15、 subjected to harmful interference as a result of the operation of the 802.22 device. Signals that the 802.22 device shall sense for are: Television Broadcasts Wireless Microphone transmissions Transmissions from protecting devices, such as the 802.22.1 Wireless Beacon Other incumbent devices such a

16、s medical telemetry devices which may need to be protected in the local regulatory domain. (see footnote 20 page 8 of the FCC R&O 08-260)The 802.22 systems shall select their operating, backup, candidate channel sets based on the procedures that are described in Section 9.2.3. The 802.22 transmissio

17、n shall be controlled by various policies which are defined in 9.2.5 related to the Spectrum Manager Policies. The Spectum Manager operation is described in detail in 9.2. Note that 802.22 devices must also sense for other 802.22 systems that may be present and operating in their area. If such syste

18、ms are discovered, the devices shall follow the coexistence procedures defined in the 802.22 MAC subclause Error! Reference source not found.The organization of this clause is as follows: subclause 9.2 describes the Spectrum Manager Operation; subclause 9.3 describes the Spectrum Sensing Automaton;

19、subclause 9.4 describes the Spectrum Sensing Function; subclause 9.5 describes the Geolocation; subclause 9.6 describes the Database Service and finally subclause 9.7 describes Primitives and Messaging associated with the cognitive functions9.2 Spectrum Manager Operation 9.2.1 GeneralThe Spectrum Ma

20、nager, as shown in the 802.22 reference model (Error! Reference source not found.), shall be part of the cognitive plane and shall always be present at the 802.22 BS. The SM is responsible for the most important tasks, such as maintaining spectrum availability information, channel selection, channel

21、 management, scheduling spectrum sensing operation, access to the database, enforcing 802.22 and regulatory domain policies, and enabling self-coexistence etc. The detailed operation of the SM is described in Section 9.2. Figure 1 shows the 802.22 Spectrum Manager along with its logical interfaces t

22、o various entities. Figure 1 IEEE 802.22 Spectrum Manager and Logical InterfacesAll the 802.22 devices (BS and CPEs) shall also have an entity called the Spectrum Sensing Automaton (SSA). The SSA interfaces to the Spectrum Sensing Function (SSF) and executes the commands from the SM to enable spectr

23、um sensing. The detailed operation of the SSA is described in Section 9.3. The following clauses describe the SM functionalities. The SM is a central part of the WRAN BS, which shall be responsible for ensuring protection of incumbents and efficient spectrum utilization while complying with regulato

24、ry policies. For that, the SM centralizes all the decisions within the WRAN cell with respect to spectrum availability and utilization. In summary, the key functions of the SM are the following: Maintain spectrum availability Information; Channel classification and selection; Association control; Ch

25、annel state management; Accessing the database service; Scheduling quiet periods for spectrum sensing; Enforcing 802.22 and regulatory domain policies Making channel move decisions for one or more CPEs or the entire cell Self-coexistence with other WRANs, etc.These functions are described in the fol

26、lowing clauses. It is important to note that this standard does not specify any particular SM implementation, but instead, it describes the mandatory behavior for any SM implementation in order to provide for proper protection of incumbents, compliance with regulatory domain policies, and interopera

27、bility amongst different WRAN implementations.9.2.2 Maintain Spectrum Availability Information The SM shall maintain the status of the spectrum (i.e. TV channels) available for WRAN operation at its location within a regulatory domain according to the policies and rules established for that domain (

28、e.g. regulatory rules established by the FCC in the US for use of TV channels). The SM shall obtain information on the channel status with respect to the presence of incumbents and other WRANs in the area, and it shall use this information as input for its decisions with respect to channel selection

29、, channel state management and self-coexistence mechanisms.To maintain the status of the channels available for operation, the SM shall be able to aggregate information from at least the following sources:1. Incumbent database: The SM shall access incumbent databases through the higher layers. For t

30、he purposes of the 802.22 operation, a database containing location dependent available channels shall always exist. The SM shall be responsible for accessing an official incumbent database in the regulatory domains that mandate the presence of such a database. In the regulatory domains that do not

31、mandate an official database, a database of available channels shall be provided by the operator.2. Geolocation: The SM shall be able to access geolocation information available at the BS to identify its own location, and it shall also be able to obtain location information from all CPEs associated

32、with the BS or that are requesting association with the BS.3. Spectrum sensing: The SM shall interface with the Spectrum Sensing Automatons located within the BS and the CPEs. The SM shall use the MAC and PHY layer functionalities and management frames to control and coordinate spectrum sensing within the WRAN cell. The SM shall trigger the requests for the SSAs located within the BS and the CPEs to per