Internet Engineering Task Force (IETF)                   A. Mancuso, Ed.
Request for Comments: 6953                                        Google
Category: Informational                                      S. Probasco
ISSN: 2070-1721
                                                                B. Patil
                                                           Cisco Systems
                                                                May 2013

Protocol to Access White-Space (PAWS) Databases: Use Cases and Requirements




Portions of the radio spectrum that are assigned to a particular use but are unused or unoccupied at specific locations and times are defined as "white space". The concept of allowing additional transmissions (which may or may not be licensed) in white space is a technique to "unlock" existing spectrum for new use. This document includes the problem statement for the development of a protocol to access a database of white-space information followed by use cases and requirements for that protocol. Finally, requirements associated with the protocol are presented.

特定の用途に割り当てられているが、特定の場所や時間で使用されていない、または使用されていない無線スペクトルの部分は、「空白」として定義されます。ホワイトスペースでの追加の送信(ライセンスがある場合とない場合があります)を許可するという概念は、既存のスペクトルを新たに使用するために "ロック解除"する技術です。このドキュメントには、ホワイトスペース情報のデータベースにアクセスするためのプロトコルの開発に関する問題ステートメントと、そのプロトコルの使用例と要件が含まれています。最後に、プロトコルに関連する要件が提示されます。

Status of This Memo


This document is not an Internet Standards Track specification; it is published for informational purposes.

このドキュメントはInternet Standards Trackの仕様ではありません。情報提供を目的として公開されています。

This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see Section 2 of RFC 5741.

このドキュメントは、IETF(Internet Engineering Task Force)の製品です。これは、IETFコミュニティのコンセンサスを表しています。公開レビューを受け、インターネットエンジニアリングステアリンググループ(IESG)による公開が承認されました。 IESGによって承認されたすべてのドキュメントが、あらゆるレベルのインターネット標準の候補になるわけではありません。 RFC 5741のセクション2をご覧ください。

Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at


Copyright Notice


Copyright (c) 2013 IETF Trust and the persons identified as the document authors. All rights reserved.

Copyright(c)2013 IETF Trustおよびドキュメントの作成者として識別された人物。全著作権所有。

This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents ( in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License.

この文書は、BCP 78およびこの文書の発行日に有効なIETF文書に関するIETFトラストの法的規定(の対象となります。これらのドキュメントは、このドキュメントに関するあなたの権利と制限を説明しているため、注意深く確認してください。このドキュメントから抽出されたコードコンポーネントには、Trust Legal Provisionsのセクション4.eに記載されているSimplified BSD Licenseのテキストが含まれている必要があり、Simplified BSD Licenseに記載されているように保証なしで提供されます。

Table of Contents


   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Introduction to White Space  . . . . . . . . . . . . . . .  3
     1.2.  Scope  . . . . . . . . . . . . . . . . . . . . . . . . . .  4
       1.2.1.  In Scope . . . . . . . . . . . . . . . . . . . . . . .  4
       1.2.2.  Out of Scope . . . . . . . . . . . . . . . . . . . . .  4
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  5
     2.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  5
     2.2.  Requirements Language  . . . . . . . . . . . . . . . . . .  5
   3.  Problem Statement  . . . . . . . . . . . . . . . . . . . . . .  6
     3.1.  Global Applicability . . . . . . . . . . . . . . . . . . .  6
     3.2.  Database Discovery . . . . . . . . . . . . . . . . . . . .  8
     3.3.  Device Registration  . . . . . . . . . . . . . . . . . . .  8
     3.4.  Protocol . . . . . . . . . . . . . . . . . . . . . . . . .  9
     3.5.  Data Model Definition  . . . . . . . . . . . . . . . . . .  9
   4.  Use Cases  . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     4.1.  Master-Slave White-Space Networks  . . . . . . . . . . . .  9
     4.2.  Offloading: Moving Traffic to a White-Space Network  . . . 11
     4.3.  White Space Serving as Backhaul  . . . . . . . . . . . . . 13
     4.4.  Rapid Network Deployment during Emergencies  . . . . . . . 14
     4.5.  White Space Used for Local TV Broadcaster  . . . . . . . . 15
   5.  Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 16
     5.1.  Data Model Requirements  . . . . . . . . . . . . . . . . . 16
     5.2.  Protocol Requirements  . . . . . . . . . . . . . . . . . . 17
     5.3.  Operational Requirements . . . . . . . . . . . . . . . . . 19
     5.4.  Guidelines . . . . . . . . . . . . . . . . . . . . . . . . 19
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 20
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 22
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 22
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 22
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 22
1. Introduction
1. はじめに
1.1. Introduction to White Space
1.1. ホワイトスペースの紹介

Wireless spectrum is a commodity that is regulated by governments. The spectrum is used for various purposes, which include, but are not limited to, entertainment (e.g., radio and television), communication (e.g., telephony and Internet access), military (e.g., radars, etc.), and navigation (e.g., satellite communication, GPS). Portions of the radio spectrum that are assigned to a licensed (primary) user but are unused or unoccupied at specific locations and times are defined as "white space". The concept of allowing additional (secondary) transmissions (which may or may not be licensed) in white space is a technique to "unlock" existing spectrum for new use.

無線スペクトルは、政府によって規制されている商品です。スペクトルはさまざまな目的で使用され、エンターテイメント(例:ラジオやテレビ)、通信(例:電話、インターネットアクセス)、軍事(例:レーダーなど)、ナビゲーション(例:レーダーなど)が含まれますが、これらに限定されません。 、衛星通信、GPS)。ライセンスされた(プライマリ)ユーザーに割り当てられているが、特定の場所と時間で使用されていない、または使用されていない無線スペクトルの部分は、「ホワイトスペース」として定義されます。ホワイトスペースでの追加(セカンダリ)送信(ライセンスの有無は問わない)を許可するという概念は、既存のスペクトルを新たに使用するために "ロック解除"する手法です。

An obvious requirement is that these secondary transmissions do not interfere with the assigned use of the spectrum. One interesting observation is that often, in a given physical location, the primary user(s) may not be using the entire band assigned to them. The available spectrum for secondary transmissions would then depend on the location of the secondary user. The fundamental issue is how to determine, for a specific location and specific time, if any of the assigned spectrum is available for secondary use.


Academia and industry have studied multiple cognitive radio [CRADIO] mechanisms for use in such a scenario. One simple mechanism is to use a geospatial database that contains the spatial and temporal profile of all primary licensees' spectrum usage, and require secondary users to query the database for available spectrum that they can use at their location. Such databases can be accessible and queryable by secondary users on the Internet.


Any entity that is assigned spectrum that is not densely used may be asked by a governmental regulatory agency to share it to allow for more intensive use of the spectrum. Providing a mechanism by which secondary users share the spectrum with the primary user is attractive in many bands, in many countries.


This document includes the problem statement followed by use cases and requirements associated with the use of white-space spectrum by secondary users via a database query protocol. The final sections include the requirements associated with such a protocol. Note that the IETF has undertaken to develop a database query protocol (see [PAWS]).

このドキュメントには、問題ステートメントと、それに続くデータベースクエリプロトコルを介したセカンダリユーザーによるホワイトスペーススペクトルの使用に関連する使用例と要件が含まれています。最後のセクションには、そのようなプロトコルに関連する要件が含まれています。 IETFがデータベースクエリプロトコルの開発に着手したことに注意してください([PAWS]を参照)。

1.2. Scope
1.2. 範囲
1.2.1. In Scope
1.2.1. 範囲内

This document covers the requirements for a protocol to allow a device to access a database to obtain spectrum availability information. Such a protocol should allow a device to perform the following actions:


1. Determine the relevant database to query.

1. クエリする関連データベースを決定します。

2. Connect to and optionally register with the database using a well-defined protocol.

2. 明確に定義されたプロトコルを使用して、データベースに接続し、オプションでデータベースに登録します。

3. Provide geolocation and perhaps other data to the database using a well-defined format for querying the database.

3. データベースのクエリに明確に定義された形式を使用して、地理位置情報とおそらく他のデータをデータベースに提供します。

4. Receive in response to the query a list of available white-space frequencies at the specified geolocation using a well-defined format for the information.

4. 情報に明確に定義された形式を使用して、指定された地理位置情報で利用可能な空白周波数のリストをクエリに応答して受信します。

5. Send an acknowledgment to the database with information containing channels selected for use by the device and other device operation parameters.

5. デバイスで使用するために選択されたチャネルと他のデバイス操作パラメーターを含む情報とともに、確認応答をデータベースに送信します。

Note: The above protocol actions should explicitly or implicitly support the ability of devices to re-register and/or re-query the database when they change their locations or operating parameters. This will allow them to receive permission to operate in their new locations and/or with their new operating parameters, and to send acknowledgments to the database that include information on their new operating parameters.


1.2.2. Out of Scope
1.2.2. 範囲外

The following topics are out of scope for this specification:


1. It is the device's responsibility to query the database for new spectrum when the device moves, changes operating parameters, loses connectivity, etc. Other synchronization mechanisms are out of scope.

1. デバイスが移動したり、動作パラメータを変更したり、接続が失われたりした場合など、データベースに新しいスペクトルを問い合わせるのはデバイスの責任です。他の同期メカニズムは範囲外です。

2. A rogue device may operate without contacting the database to obtain available spectrum. Hence, enforcement of spectrum usage by devices is out of scope.

2. 不正なデバイスは、データベースに接続せずに動作して、利用可能なスペクトルを取得する場合があります。したがって、デバイスによるスペクトル使用の実施は範囲外です。

3. The protocol defines communications between the database and devices. The protocol for communications between devices is out of scope.

3. プロトコルは、データベースとデバイス間の通信を定義します。デバイス間の通信のプロトコルは範囲外です。

4. Coexistence and interference avoidance of white-space devices within the same spectrum are out of scope.

4. 同じスペクトル内のホワイトスペースデバイスの共存と干渉回避は範囲外です。

5. Provisioning (releasing new spectrum for white-space use) is out of scope.

5. プロビジョニング(空白を使用するための新しいスペクトルの解放)は範囲外です。

2. Conventions Used in This Document
2. このドキュメントで使用される規則
2.1. Terminology
2.1. 用語

Database: A database is an entity that contains current information about available spectrum at a given location and time, as well as other types of information related to spectrum availability and usage.


Device Class: Identifies classes of devices including fixed, mobile, portable, etc. May also indicate if the device is indoor or outdoor.


Device ID: An identifier for a device.


Master Device: A device that queries the database, on its own behalf and/or on behalf of a slave device, to obtain available spectrum information.


Slave Device: A device that queries the database through a master device.


Trusted Database: A database that is trusted by a device or provides data objects that are trusted by a device.


White Space (WS): Radio spectrum that is available for secondary use at a specific location and time.


White-Space Device (WSD): A device that uses white-space spectrum as a secondary user. A white-space device can be a fixed or portable device such as an access point, base station, or cell phone.


2.2. Requirements Language
2.2. 要件言語

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119].

このドキュメントのキーワード「MUST」、「MUST NOT」、「REQUIRED」、「SHALL」、「SHALL NOT」、「SHOULD」、「SHOULD NOT」、「RECOMMENDED」、「MAY」、および「OPTIONAL」は、 RFC 2119 [RFC2119]で説明されているように解釈されます。

3. Problem Statement
3. 問題文

The use of white-space spectrum is enabled via the capability of a device to query a database and obtain information about the availability of spectrum for use at a given location. The databases are reachable via the Internet, and the devices querying these databases are expected to have some form of Internet connectivity, directly or indirectly. While databases are expected to support the rule set(s) of one or more regulatory domains, and the regulations and available spectrum associated with each rule set may vary, the fundamental operation of the protocol must be independent of any particular regulatory environment.


An example of the high-level architecture of the devices and databases is shown in Figure 1.


                 | Master  |
                 |WS Device|                              ------------
                 |Lat: X   |\           .---.    /--------|Database A|
                 |Long: Y  | \         (     )  /         ------------
                 -----------  \-------/       \/               o
                                     ( Internet)               o
                 -----------  /------(         )\              o
                 | Master  | /        (       )  \             o
                 |WS Device|/          (_____)    \       ------------
                 |Lat: X   |                       \------|Database B|
                 |Long: Y  |                              ------------

Figure 1: High-Level View of White-Space Database Architecture


Note that there could be multiple databases serving white-space devices. In some countries, such as the U.S., the regulator has determined that multiple databases may provide service to white-space devices.


A messaging interface between the white-space devices and the database is required for operating a network using the white-space spectrum. The following sections discuss various aspects of such an interface and the need for a standard.


3.1. Global Applicability
3.1. グローバルな適用性

The use of white-space spectrum is currently approved or being considered in multiple regulatory domains, whose rules may differ. However, the need for devices that intend to use the spectrum to communicate with a database remains a common feature. The database implements rules that protect all primary users, independent of the characteristics of the white-space devices. It also provides a way to specify a schedule of use, since some primary users (for example, wireless microphones) only operate in limited time slots.


Devices need to be able to query a database, directly or indirectly, over the public Internet and/or private IP networks prior to operating in available spectrum. Information about available spectrum, schedule, power, etc., are provided by the database as a response to the query from a device. The messaging interface needs to be:


1. Interface agnostic - An interface between a master white-space device and database can be wired or unwired (e.g., a radio/air interface technology such as IEEE 802.11af, IEEE 802.15.4m, IEEE 802.16, IEEE 802.22, LTE, etc.) However, the messaging interface between a master white-space device and the database should be agnostic to the interface used for such messaging while being cognizant of the characteristics of the interface technology and the need to include any relevant attributes in the query to the database.

1. インターフェースにとらわれない-マスターホワイトスペースデバイスとデータベース間のインターフェースは有線または非有線にすることができます(たとえば、IEEE 802.11af、IEEE 802.15.4m、IEEE 802.16、IEEE 802.22、LTEなどの無線/エアインターフェーステクノロジー)。ただし、マスターホワイトスペースデバイスとデータベース間のメッセージングインターフェイスは、そのようなメッセージングに使用されるインターフェイスにとらわれず、インターフェイステクノロジーの特性と、データベースへのクエリに関連する属性を含める必要があることを認識している必要があります。

2. Spectrum agnostic - The spectrum used by primary and secondary users varies by country. Some spectrum bands have an explicit notion of a "channel": a defined swath of spectrum within a band that has some assigned identifier. Other spectrum bands may be subject to white-space sharing, but only have actual frequency low/high parameters to define primary and secondary use. The protocol should be able to be used in any spectrum band where white-space sharing is permitted.

2. スペクトルにとらわれない-プライマリユーザーとセカンダリユーザーが使用するスペクトルは国によって異なります。一部のスペクトルバンドには、「チャネル」という明示的な概念があります。これは、割り当てられた識別子を持つバンド内の定義されたスペクトルの帯です。他のスペクトルバンドはホワイトスペース共有の対象になる場合がありますが、実際の周波数の低/高パラメータのみがあり、1次および2次の使用を定義します。プロトコルは、空白の共有が許可されているすべてのスペクトル帯域で使用できる必要があります。

3. Globally applicable - A common messaging interface between white-space devices and databases will enable the use of such spectrum for various purposes on a global basis. Devices can operate in any location where such spectrum is available and a common interface ensures uniformity in implementations and deployment. To allow the global use of white-space devices in different countries (whatever the regulatory domain), the protocol should support the database that communicates the applicable regulatory rule-set information to the white-space device.

3. グローバルに適用可能-ホワイトスペースデバイスとデータベース間の共通のメッセージングインターフェイスにより、そのようなスペクトルをさまざまな目的でグローバルに使用できます。デバイスは、そのようなスペクトルが利用可能な任意の場所で動作でき、共通のインターフェイスにより、実装と展開の均一性が保証されます。さまざまな国(規制ドメインに関係なく)でホワイトスペースデバイスをグローバルに使用できるようにするには、プロトコルは、適用可能な規制ルールセット情報をホワイトスペースデバイスに通信するデータベースをサポートする必要があります。

4. Built on flexible and extensible data structures - Different databases are likely to have different requirements for the kinds of data required for registration (different regulatory rule sets that apply to the registration of devices) and other messages sent by the device to the database. For instance, different regulators might require different device-characteristic information to be passed to the database.

4. 柔軟で拡張可能なデータ構造に基づいて構築-データベースによって、登録に必要なデータの種類(デバイスの登録に適用されるさまざまな規制ルールセット)や、デバイスからデータベースに送信されるその他のメッセージについて、さまざまな要件がある可能性があります。たとえば、レギュレーターが異なれば、データベースに渡されるデバイスの特性情報も異なります。

3.2. Database Discovery
3.2. データベースの発見

The master device must obtain the address of a trusted database, which it will query for available white-space spectrum. If the master device uses a discovery service to locate a trusted database, it may perform the following steps (this description is intended as descriptive, not prescriptive):


1. The master device constructs and sends a request (e.g., over the Internet) to a trusted discovery service.

1. マスターデバイスは、リクエストを作成して(インターネットなどを介して)信頼できるディスカバリサービスに送信します。

2. If no acceptable response is received within a pre-configured time limit, the master device concludes that no trusted database is available. If at least one response is received, the master device evaluates the response(s) to determine if a trusted database can be identified where the master device is able to receive service from the database. If so, it establishes contact with the trusted database.

2. 事前に構成された時間制限内に受け入れ可能な応答が受信されない場合、マスターデバイスは、信頼できるデータベースを利用できないと結論付けます。少なくとも1つの応答が受信されると、マスターデバイスは応答を評価して、マスターデバイスがデータベースからサービスを受信できる信頼できるデータベースを識別できるかどうかを判断します。その場合、信頼できるデータベースとの接続を確立します。

3. The master device establishes a white-space network as described in Section 4.

3. マスターデバイスは、セクション4で説明するように、ホワイトスペースネットワークを確立します。

Optionally, and in place of steps 1-2 above, the master device can be pre-configured with the address (e.g., URI) of one or more trusted databases. The master device can establish contact with one of these trusted databases.


3.3. Device Registration
3.3. デバイス登録

The master device may register with the database before it queries the database for available spectrum. A registration process may consist of the following steps:


1. The master device sends registration information to the database. This information may include the device ID; serial number assigned by the manufacturer; device location; device antenna height above ground; name of the individual or business that owns the device; and the name, postal address, email address, and phone number of a contact person responsible for the device's operation.

1. マスターデバイスは登録情報をデータベースに送信します。この情報にはデバイスIDが含まれる場合があります。製造元によって割り当てられたシリアル番号。デバイスの場所。地上のデバイスアンテナの高さ。デバイスを所有する個人または企業の名前。デバイスの操作を担当する連絡先の名前、住所、電子メールアドレス、および電話番号。

2. The database responds to the registration request with an acknowledgment to indicate the success of the registration request or with an error if the registration was unsuccessful. Additional information may be provided by the database in its response to the master device.

2. データベースは、登録要求が成功したことを示す確認応答で、または登録が失敗した場合はエラーで、登録要求に応答します。追加情報は、マスターデバイスへの応答でデータベースによって提供される場合があります。

3.4. Protocol
3.4. プロトコル

A protocol that enables a white-space device to query a database to obtain information about available spectrum is needed. A device may be required to register with the database with some credentials prior to being allowed to query. The requirements for such a protocol are specified in this document.


3.5. Data Model Definition
3.5. データモデルの定義

The contents of the queries and response need to be specified. A data model is required; it must enable the white-space device to query the database while including all the relevant information, such as geolocation, radio technology, power characteristics, etc., which may be country, spectrum, and regulatory dependent. All databases are able to interpret the data model and respond to the queries using the same data model that is understood by all devices.


4. Use Cases
4. ユースケース

There are many potential use cases for white-space spectrum -- for example, providing broadband Internet access in urban and densely populated hotspots, as well as rural and remote, underserved areas. Available white-space spectrum may also be used to provide Internet 'backhaul' for traditional Wi-Fi hotspots or for use by towns and cities to monitor/control traffic lights, read utility meters, and the like. Still other use cases include the ability to offload data traffic from another Internet access network (e.g., 3G cellular network) or to deliver data, information, or a service to a user based on the user's location. Some of these use cases are described in the following sections.


4.1. Master-Slave White-Space Networks
4.1. マスタースレーブホワイトスペースネットワーク

There are a number of common scenarios in which a master white-space device will act as proxy or mediator for one or more slave devices using its connection to the Internet to query the database for available spectrum for itself and for one or more slave devices. These slave devices may be fixed or mobile, in close proximity with each other (indoor network or urban hotspot), or at a distance (rural or remote WAN). Once slave devices switch to white-space spectrum for their communications, they may connect through the master to the Internet or use white-space spectrum for intra-network communications only. The master device can continue to arbitrate and control white-space communications by slave devices, and it may notify them when they are required to change white-space frequencies or cease white-space communications.


Figure 2 depicts the general architecture of such a simple master-slave network in which the master device communicates with a database on its own behalf and on behalf of slave devices.


          |Slave |
          |Device| \             \|/                          ----------
          |  1   |  (Air)         |                           |Database|
          --------       \        |                 (----)   /|--------|
             |            \ ------|------          (      ) /
             |             \|  Master   |         /        \
           --------        /|           |======= ( Internet )
           |Slave |       / |  Device   |         \        /
           |Device|  (Air)  |           |          (      )
           |  2   | /       |-----------|           (----)
           --------        /
             o   |        /
             o   |     (Air)
             o   |      /
           --------    /
           |Slave |   /
           |Device|  /
           |  n   |

Figure 2: Master-Slave White-Space Network


The protocol requirements for these master-slave devices and other similar scenarios is essentially the same: the protocol must support the ability of a master device to make available-spectrum query requests on behalf of slave devices, passing device identification, geolocation, and other slave device parameters to the database as required to obtain a list of white-space spectrum available for use by one or more slave devices. Of course, different use cases will use this spectrum information in different ways, and the details of master/slave communications may be different for different use cases.

これらのマスタースレーブデバイスと他の同様のシナリオのプロトコル要件は基本的に同じです。プロトコルは、マスターデバイスがスレーブデバイスに代わって利用可能なスペクトルクエリ要求を送信し、デバイスの識別、地理位置情報、およびその他のスレーブを渡す機能をサポートする必要があります。 1つ以上のスレーブデバイスで使用できるホワイトスペーススペクトルのリストを取得するために必要なデータベースへのデバイスパラメータ。もちろん、さまざまなユースケースでこのスペクトル情報をさまざまな方法で使用します。マスター/スレーブ通信の詳細は、さまざまなユースケースで異なる場合があります。

Common steps that may occur in master-slave networks include the following:


1. The master device powers up.

1. マスターデバイスの電源が入ります。

2. Slave devices may power up and associate with the master device via Wi-Fi or some other over-the-air, non-white-space spectrum. Until the slave device is allocated white-space spectrum, any master-slave or slave-slave communications occurs over such non-white-space spectrum.

2. スレーブデバイスは、電源が入り、Wi-Fiまたはその他の無線、ホワイトスペース以外のスペクトルを介してマスターデバイスに関連付けられます。スレーブデバイスにホワイトスペーススペクトルが割り当てられるまで、マスタースレーブまたはスレーブスレーブ通信はこのような非ホワイトスペーススペクトルで発生します。

3. The master has Internet connectivity, determines (or knows) its location, and establishes a connection to a trusted database (see Section 3.2).

3. マスターはインターネットに接続し、その場所を決定(または認識)し、信頼できるデータベースへの接続を確立します(セクション3.2を参照)。

4. The master may register with the trusted database (see Section 3.3).

4. マスターは、信頼できるデータベースに登録できます(セクション3.3を参照)。

5. The master sends a query to the trusted database requesting a list of available white-space spectrum based upon its geolocation. Query parameters may include the master's location, device identifier, and antenna height. The master may send available-spectrum requests to the database on behalf of slave devices.

5. マスターは、その地理位置情報に基づいて、利用可能なホワイトスペーススペクトルのリストを要求するクエリを信頼できるデータベースに送信します。クエリパラメータには、マスターの場所、デバイス識別子、アンテナの高さが含まれる場合があります。マスターは、スレーブデバイスの代わりに、使用可能なスペクトル要求をデータベースに送信できます。

6. The database responds to the master's query with a list of available white-space spectrum, associated maximum power levels, and durations of time for spectrum use. If the master made requests on behalf of slave devices, the master may transmit the obtained available-spectrum lists to the slaves (or the master may allocate spectrum to slaves from the obtained spectrum lists).

6. データベースは、使用可能なホワイトスペーススペクトル、関連する最大パワーレベル、およびスペクトル使用の継続時間のリストを使用して、マスターのクエリに応答します。マスターがスレーブデバイスに代わって要求を行った場合、マスターは取得した使用可能なスペクトルリストをスレーブに送信できます(またはマスターは取得したスペクトルリストからスレーブにスペクトルを割り当てることができます)。

7. The master may inform the database of the spectrum and power level it selects from the available spectrum list. If a slave device has been allocated available white-space spectrum, the slave may inform the master of the spectrum and power level it has chosen, and the master may, in turn, relay such slave device usage to the database.

7. マスターは、利用可能なスペクトルリストから選択したスペクトルとパワーレベルをデータベースに通知できます。スレーブデバイスに使用可能なホワイトスペーススペクトルが割り当てられている場合、スレーブはマスターに選択したスペクトルと電力レベルを通知し、マスターはそのようなスレーブデバイスの使用状況をデータベースに中継します。

8. Further communication among masters and slaves over the white-space network may occur via the selected/allocated white-space spectrum frequencies.

8. ホワイトスペースネットワークを介したマスターとスレーブ間のさらなる通信は、選択された/割り当てられたホワイトスペーススペクトル周波数を介して行われる可能性があります。

Note: Steps 5 through 7 may be repeated by the master device when it (or a slave device that uses the master as a proxy to communicate with the database) changes its location or operating parameters -- for example, after a master changes location, it may query the database for available spectrum at its new location, then acknowledge the subsequent response received from the database with information on the spectrum and power levels it is using at the new location.


4.2. Offloading: Moving Traffic to a White-Space Network
4.2. オフロード:ホワイトスペースネットワークへのトラフィックの移動

This scenario is a variant of the master-slave network described in the previous use case. In this scenario, an access point (AP) offers a white-space service that offloads Internet traffic as an alternative data path to a more congested or costly Internet wire, wireless, or satellite service.


Figure 3 shows an example of deployment of this scenario.


          \|/              /|Access Point |\
           |       (Air)--/ |-------------| \
         --|------ /                         \               -----------
        |Portable|/                           \      (----)  | Database|
        | Device |                             \    (      ) /----------
        |--------|\                             \  /        \
                   \                             X( Internet )
                    \                           /  \        /
                     (Air)                     /    (      )
                        \                     /      (----)
                         \                   /
                           |    Metered    |
                           |    Service    |

Figure 3: Offloading Traffic to a White-Space Network


A simplified operation scenario of offloading content, such as video stream, from a congested or costly Internet connection to a white-space service provided by an AP consists of the following steps:


1. The AP contacts the database to determine channels it can use.

1. APはデータベースにアクセスして、使用できるチャネルを決定します。

2. The portable device connects to a paid Internet service and selects a video for streaming.

2. ポータブルデバイスは有料インターネットサービスに接続し、ストリーミングするビデオを選択します。

3. The portable device determines if it can offload to a white-space AP:

3. ポータブルデバイスは、ホワイトスペースAPにオフロードできるかどうかを判断します。

A. If the portable device knows its location, it


1. asks the database (using the paid service) for available white-space spectrum;

1. (有料サービスを使用して)データベースに利用可能な空白スペーススペクトルを要求します。

2. listens for and connects to the AP over the permitted white-space spectrum.

2. 許可されたホワイトスペーススペクトルでAPをリッスンして接続します。

B. If the portable device does not have GPS or other means to determine its position, it


1. uses non-white-space spectrum to listen for and connect to the AP;

1. ホワイトスペース以外のスペクトルを使用して、APをリッスンして接続します。

2. asks the AP to query the database for permitted white-space spectrum on its behalf;

2. APに代わって許可されたホワイトスペーススペクトルをデータベースに問い合わせるようAPに要求します。

3. uses the permitted white-space spectrum to connect to the AP.

3. 許可されたホワイトスペーススペクトルを使用してAPに接続します。

4. The portable device accesses the Internet through the AP to stream the selected video.

4. ポータブルデバイスは、APを介してインターネットにアクセスし、選択したビデオをストリーミングします。

4.3. White Space Serving as Backhaul
4.3. バックホールとして機能する空白

In this use case, an Internet connectivity service is provided to users over a common wireless standard, such as Wi-Fi, with a white-space master/slave network providing backhaul connectivity to the Internet. Note that Wi-Fi is referenced in Figure 4 and the following discussion, but any other technology can be substituted in its place.

この使用例では、Wi-Fiなどの一般的なワイヤレス標準を介してインターネット接続サービスがユーザーに提供され、ホワイトスペースマスター/スレーブネットワークがインターネットへのバックホール接続を提供します。 Wi-Fiは図4および以下の説明で参照されていますが、他のテクノロジーで置き換えることもできます。

   Figure 4 shows an example of deployment of this scenario.
                         \|/   White      \|/    \|/     Wi-Fi \|/
                          |    Space       |      |             |
                          |                |      |           |-|----|
            (----)      |-|----|         |-|------|-|         | Wi-Fi|
           (      )     |Master|         | Slave    |--(Air)--| Dev  |
          /        \    |      |--(Air)--| Bridge   |         |------|
         ( Internet )---|      |         | to Wi-Fi |
          \        /    |------|         |----------|           \|/
           (      )                                  \           |
            (----)                                    \(Air)   |-|----|
                                                            \--| Wi-Fi|
                                                               | Dev  |

Figure 4: White-Space Network Used for Backhaul


Once the bridged device (Slave Bridge + Wi-Fi) is connected to a master and WS network, a simplified operation scenario of backhaul for Wi-Fi consists of the following steps:

ブリッジデバイス(スレーブブリッジ+ Wi-Fi)がマスターおよびWSネットワークに接続されると、Wi-Fiのバックホールの簡略化された操作シナリオは、次の手順で構成されます。

1. A bridged slave device (Slave Bridge + Wi-Fi) is connected to a master device operating in the WS spectrum (the master obtains available white-space spectrum as described in Section 4.1).

1. ブリッジされたスレーブデバイス(スレーブブリッジ+ Wi-Fi)は、WSスペクトルで動作するマスターデバイスに接続されます(マスターは、セクション4.1で説明されているように、利用可能なホワイトスペーススペクトルを取得します)。

2. Once the slave device is connected to the master, the Wi-Fi access point has Internet connectivity as well.

2. スレーブデバイスがマスターに接続されると、Wi-Fiアクセスポイントもインターネットに接続できるようになります。

3. End users attach to the Wi-Fi network via their Wi-Fi-enabled devices and receive Internet connectivity.

3. エンドユーザーは、Wi-Fi対応デバイスを介してWi-Fiネットワークに接続し、インターネット接続を受信します。

4.4. Rapid Network Deployment during Emergencies
4.4. 緊急時の迅速なネットワーク展開

Organizations involved in handling emergency operations maintain an infrastructure that relies on dedicated spectrum for their operations. However, such infrastructures are often affected by the disasters they handle. To set up a replacement network, spectrum needs to be quickly cleared and reallocated to the crisis response organization. Automation of this allocation and assignment is often the best solution. A preferred option is to make use of a robust protocol that has been adopted and implemented by radio manufacturers. A typical network topology solution might include wireless access links to the public Internet or private network, wireless ad hoc network radios working independently of a fixed infrastructure, and satellite links for backup where lack of coverage, overload, or outage of wireless access links can occur.

緊急オペレーションの処理に関与する組織は、オペレーションの専用スペクトルに依存するインフラストラクチャを維持しています。ただし、このようなインフラストラクチャは、対応する災害の影響を受けることがよくあります。代替ネットワークをセットアップするには、スペクトルを迅速にクリアして、危機対応組織に再割り当てする必要があります。この割り当てと割り当ての自動化は、多くの場合、最良のソリューションです。推奨されるオプションは、無線メーカーによって採用および実装されている堅牢なプロトコルを利用することです。典型的なネットワークトポロジソリューションには、パブリックインターネットまたはプライベートネットワークへのワイヤレスアクセスリンク、固定インフラストラクチャとは独立して動作するワイヤレスアドホックネットワーク無線、カバレッジの不足、過負荷、またはワイヤレスアクセスリンクの停止が発生する可能性があるバックアップ用の衛星リンクが含まれる場合があります。 。

Figure 5 shows an example of deployment of this scenario.


                                 | ad hoc
                               | Master node   |    |-------------|
          \|/                  | with          |    | White-Space |
           | ad hoc           /| backhaul link |    | Database    |
           |             /---/ |---------------|    |-------------|
        ---|------------/                |      \           /
        | Master node   |                |       |      (--/--)
        | without       |                |        -----(       )
        | backhaul link |                |  Wireless  / Private \
        ----------------\                |    Access (   net or  )
                         \                |           \ Internet )
                          \    \|/        |      ------(        /
                           \    | ad hoc  |      |      (------)
                            \   |         |      /          \
                             \--|-------------  /Satellite   ----------
                             | Master node   | / Link        | Other  |
                             | with          |/              | nodes  |
                             | backhaul link |               ----------

Figure 5: Rapidly Deployed Network with Partly Connected Nodes


In the ad hoc network, all nodes are master nodes that allocate radio frequency (RF) channels from the database (as described in Section 4.1). However, the backhaul link may not be available to all nodes, such as depicted for the left node in the above figure. To handle RF channel allocation for such nodes, a master node with a backhaul link relays or proxies the database query for them. So master nodes without a backhaul link follow the procedure as defined for clients. The ad hoc network radios utilize the provided RF channels. Details on forming and maintenance of the ad hoc network, including repair of segmented networks caused by segments operating on different RF channels, is out of scope of spectrum allocation.


4.5. White Space Used for Local TV Broadcaster
4.5. ローカルTV放送局に使用される空白

Available white-space spectrum can be deployed in novel ways to leverage the public use of hand-held and portable devices. One such use is white-space spectrum used for local TV transmission of audio-video content to portable devices used by individuals in attendance at an event. In this use case, audience members at a seminar, entertainment event, or other venue plug a miniature TV receiver fob into their laptop, computer tablet, cell phone, or other portable device. A master device obtains a list of available white-space spectrum (as described in Section 4.1), then broadcasts audio-video content locally to the audience over one of the available frequencies. Audience members receive the content through their miniature TV receivers tuned to the appropriate white-space band for display on the monitors of their portable devices.


Figure 6 shows an example of deployment of this scenario.


                                                |White-Space |
                                                | Database   |
                                      .---.   / |------------|
              |-----------|          (     ) /
              |  Master   |         /       \
              |           |========( Internet)
              |-----------|         \       /
                    |                (     )
                   /|\                (---)

(White-Space Broadcast)


         \|/   \|/   \|/   \|/   \|/   \|/   \|/
          |     |     |     |     |     |     |     .................
        ----- ----- ----- ----- ----- ----- -----
        |   | |   | |   | |   | |   | |   | |   |
        |   | |   | |   | |   | |   | |   | |   |
        ----- ----- ----- ----- ----- ----- -----
       USB TV receivers connected to laptops, cell phones, tablets ...

Figure 6: White Space Used for Local TV Broadcast


5. Requirements
5. 必要条件
5.1. Data Model Requirements
5.1. データモデルの要件

D.1 The data model MUST support specifying the geolocation of the white-space device, the uncertainty in meters, the height and its uncertainty, and the percentage of confidence in the location determination. The data model MUST support [WGS84].


D.2 The data model MUST support specifying the data and other applicable requirements of the rule set that applies to the white-space device at a specified location.


D.3 The data model MUST support device description data that identifies a white-space device (serial number, certification IDs, etc.) and describes device characteristics, such as device class (fixed, mobile, portable, indoor, outdoor, etc.), Radio Access Technology (RAT), etc.

D.3データモデルは、空白スペースデバイス(シリアル番号、認証IDなど)を識別し、デバイスクラス(固定、モバイル、ポータブル、屋内、屋外など)などのデバイス特性を記述するデバイス記述データをサポートする必要があります。 )、Radio Access Technology(RAT)など

D.4 The data model MUST support specifying a manufacturer's serial number for a white-space device.


D.5 The data model MUST support specifying the antenna- and radiation-related parameters of the white-space device, such as:


antenna height


antenna gain


maximum output power, Equivalent Isotropic Radiated Power (EIRP) in dBm (decibels referenced to 1 milliwatt)


antenna radiation pattern (directional dependence of the strength of the radio signal from the antenna)


spectrum mask with lowest and highest possible frequency


spectrum mask in dBr (decibels referenced to an arbitrary reference level) from peak transmit power in EIRP, with specific power limit at any frequency linearly interpolated between adjacent points of the spectrum mask


measurement resolution bandwidth for EIRP measurements


D.6 The data model MUST support specifying owner and operator contact information for a transmitter. This includes the name of the transmitter owner and the name, postal address, email address, and phone number of the transmitter operator.


D.7 The data model MUST support specifying spectrum availability. Spectrum units are specified by low and high frequencies and may have an optional channel identifier. The data model MUST support a schedule including start time and stop time for spectrum unit availability. The data model MUST support maximum power level for each spectrum unit.


D.8 The data model MUST support specifying spectrum availability information for a single location and an area (e.g., a polygon defined by multiple location points or a geometric shape such as a circle).


D.9 The data model MUST support specifying the frequencies and power levels selected for use by a white-space device in the acknowledgment message.


5.2. Protocol Requirements
5.2. プロトコル要件

P.1 The master device identifies a database to which it can register, make spectrum availability requests, etc. The protocol MUST support the discovery of an appropriate database given a location provided by the master device. The master device MAY select a database by discovery at run time or by means of a pre-programmed URI. The master device MAY validate discovered or configured database addresses against a list of known databases (e.g., a list of databases approved by a regulatory body).


P.2 The protocol MUST support the database informing the master of the regulatory rules (rule set) that applies to the master device (or any slave devices on whose behalf the master is contacting the database) at a specified location.


P.3 The protocol MUST provide the ability for the database to authenticate the master device.


P.4 The protocol MUST provide the ability for the master device to verify the authenticity of the database with which it is interacting.


P.5 The messages sent by the master device to the database and the messages sent by the database to the master device MUST support integrity protection.


P.6 The protocol MUST provide the capability for messages sent by the master device and database to be encrypted.


P.7 Tracking of master or slave device uses of white-space spectrum by database administrators, regulatory agencies, and others who have access to a white-space database could be considered invasive of privacy, including privacy regulations in specific environments. The PAWS protocol SHOULD support privacy-sensitive handling of device-provided data where such protection is feasible, allowed, and desired.

P.7データベース管理者、規制機関、およびホワイトスペースデータベースにアクセスできるその他の人によるホワイトスペーススペクトルのマスターまたはスレーブデバイス使用の追跡は、特定の環境でのプライバシー規制を含め、プライバシーの侵害と見なされる可能性があります。 PAWSプロトコルは、そのような保護が実行可能であり、許可され、望まれる場合、デバイスが提供するデータのプライバシーに配慮した処理をサポートする必要があります(SHOULD)。

P.8 The protocol MUST support the master device registering with the database; see Device Registration (Section 3.3).


P.9 The protocol MUST support a registration acknowledgment indicating the success or failure of the master device registration.


P.10 The protocol MUST support an available spectrum request from the master device to the database, which may include one or more of the data items listed in Data Model Requirements (Section 5.1). The request may include data that the master device sends on its own behalf and/or on behalf of one or more slave devices.


P.11 The protocol MUST support an available spectrum response from the database to the master device, which may include one or more of the data items listed in Data Model Requirements (Section 5.1). The response may include data related to master and/or slave device operation.


P.12 The protocol MUST support a spectrum usage message from the master device to the database, which may include one or more of the data items listed in Data Model Requirements (Section 5.1). The message may include data that the master device sends on its own behalf and/or on behalf of one or more slave devices.


P.13 The protocol MUST support a spectrum usage message acknowledgment.


P.14 The protocol MUST support a validation request from the master device to the database to validate a slave device, which should include information necessary to identify the slave device to the database.


P.15 The protocol MUST support a validation response from the database to the master to indicate if the slave device is validated by the database. The validation response MUST indicate the success or failure of the validation request.


P.16 The protocol MUST support the capability for the database to inform master devices of changes to spectrum availability information.


5.3. Operational Requirements
5.3. 運用要件

This section contains operational requirements of a database-device system, independent of the requirements of the protocol for communication between the database and devices.


O.1 The master device must be able to connect to the database to send requests to the database and receive responses to, and acknowledgments of, its requests from the database.


O.2 A master device MUST be able to determine its location including uncertainty and confidence level. A fixed master device may use a location programmed at installation.


O.3 The master device MUST be configured to understand and comply with the requirements of the rule set of the regulatory body that apply to its operation at its location.


O.4 A master device MUST query the database for the available spectrum at a specified location before starting radio transmission in white space at that location.


O.5 A master device MUST be able to query the database for the available spectrum on behalf of a slave device at a specified location before the slave device starts radio transmission in white space at that location.


O.6 The database MUST respond to an available spectrum request.


5.4. Guidelines
5.4. ガイドライン

White-space technology itself is expected to evolve and include attributes such as coexistence and interference avoidance, spectrum brokering, alternative spectrum bands, etc. The design of the data model and protocol should be cognizant of the evolving nature of white-space technology and consider the following set of guidelines in the development of the data model and protocol:


1. The data model SHOULD provide a modular design separating messaging-specific, administrative-specific, and spectrum-specific parts into distinct modules.

1. データモデルは、メッセージング固有、管理固有、およびスペクトル固有の部分を別個のモジュールに分離するモジュール設計を提供する必要があります(SHOULD)。

2. The protocol SHOULD support determination of which administrative-specific and spectrum-specific modules are used.

2. プロトコルは、使用される管理固有およびスペクトル固有のモジュールの決定をサポートする必要があります(SHOULD)。

6. Security Considerations
6. セキュリティに関する考慮事項

PAWS is a protocol whereby a master device requests a schedule of available spectrum at its location (or the location of its slave devices) before it (or they) can operate using those frequencies. Whereas the information provided by the database must be accurate and conform to applicable regulatory rules, the database cannot enforce, through the protocol, that a client device uses only the spectrum it provided. In other words, devices can put energy in the air and cause interference without asking the database. Hence, PAWS security considerations do not include protection against malicious use of the white-space spectrum.


Threat model for the PAWS protocol:




The link between the master device and the database can be wired or wireless and provides IP connectivity. It is assumed that an attacker has full access to the network medium between the master device and the database. The attacker may be able to eavesdrop on any communications between these entities.


Threat 1: User modifies a device to masquerade as another valid certified device


A master device identifies itself to the database in order to obtain information about available spectrum. Without suitable protection mechanisms, devices can listen to registration exchanges and later register with the database by claiming the identity of another device.


Threat 2: Spoofed database


A master device attempts to discover a database (or databases) that it can query for available spectrum information. An attacker may attempt to spoof a database and provide responses to a master device that are malicious and result in the master device causing interference to the primary user of the spectrum.


Threat 3: Modifying or jamming a query request


An attacker may modify or jam the query request sent by a master device to a database. The attacker may change the location of the device or its capabilities (transmit power, antenna height, etc.), and, as a result, the database responds with incorrect information about available spectrum or maximum transmit power allowed. The result of such an attack is that the master device can cause interference to the primary user of the spectrum. It may also result in a denial of service to the master device if the modified database response indicates that no channels are available to the master device or when a jammed query prevents the request from reaching the database.


Threat 4: Modifying or jamming a query response


An attacker may modify or jam the query response sent by the database to a master device. For example, an attacker may modify the available spectrum or power-level information carried in the database response. As a result, a master device may use spectrum that is not available at a location or may transmit at a greater power level than allowed. Such unauthorized use can result in interference to the primary user of that spectrum. Alternatively, an attacker may modify a database response to indicate that no spectrum is available at a location (or jam the response), resulting in a denial of service to the master device.


Threat 5: Third-party tracking of white-space device location and identity


A master device may provide its identity in addition to its location in the query request. Such location/identity information can be gleaned by an eavesdropper and used for unauthorized tracking purposes.


Threat 6: Malicious individual acts as a database to terminate or unfairly limit spectrum access of devices


A database may include a mechanism by which service and spectrum allocated to a master device can be revoked by sending a revoke message to a master device. A malicious user can pretend to be a database and send a revoke message to that device. This results in denial of service to the master device.


The security requirements arising from the above threats are captured in the requirements of Section 5.2.


7. Acknowledgments
7. 謝辞

The authors acknowledge Gabor Bajko, Teco Boot, Nancy Bravin, Rex Buddenberg, Vincent Chen, Gerald Chouinard, Stephen Farrell, Michael Fitch, Joel M. Halpern, Jussi Kahtava, Paul Lambert, Barry Leiba, Subramanian Moonesamy, Pete Resnick, Brian Rosen, Andy Sago, Peter Stanforth, John Stine, and Juan Carlos Zuniga for their contributions to this document.

著者は、Gabor Bajko、Teco Boot、Nancy Bravin、Rex Buddenberg、Vincent Chen、Gerald Chouinard、Stephen Farrell、Michael Fitch、Joel M. Halpern、Jussi Kahtava、Paul Lambert、Barry Leiba、Subramanian Moonesamy、Pete Resnick、Brian Rosen、このドキュメントへの貢献に対して、Andy Sago、Peter Stanforth、John Stine、およびJuan Carlos Zuniga。

8. References
8. 参考文献
8.1. Normative References
8.1. 引用文献

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.

[RFC2119] Bradner、S。、「要件レベルを示すためにRFCで使用するキーワード」、BCP 14、RFC 2119、1997年3月。

[WGS84] National Imagery and Mapping Agency, "Department of Defense World Geodetic System 1984, Its Definition and Relationships with Local Geodetic Systems", NIMA TR8350.2 Third Edition Amendment 1, January 2000, < wgs84fin.pdf>.

[WGS84] National Imagery and Mapping Agency、「国防総省世界測地システム1984、その定義と地域の測地システムとの関係」、NIMA TR8350.2改訂3、2000年1月1日、<http://earth-info.nga .mil / GandG / publications / tr8350.2 / wgs84fin.pdf>。

8.2. Informative References
8.2. 参考引用

[CRADIO] Cognitive Radio Technologies Proceeding (CRTP), "Federal Communications Commission", ET Docket No. 03-108, August 2010, <>.

[CRADIO] Cognitive Radio Technologies Proceeding(CRTP)、「Federal Communications Commission」、ET Docket No. 03-108、2010年8月、<>。

[PAWS] Chen, V., Ed., Das, S., Zhu, L., Malyar, J., and P. McCann, "Protocol to Access Spectrum Database", Work in Progress, May 2013.

[PAWS] Chen、V.、Ed。、Das、S.、Zhu、L.、Malyar、J.、and P. McCann、 "Protocol to Access Spectrum Database"、Work in Progress、2013年5月。

Authors' Addresses


Anthony Mancuso (editor) Google 1600 Amphitheatre Parkway Mountain View, CA 94043 US

Anthony Mancuso(編集者)Google 1600 Amphitheatre Parkway Mountain View、CA 94043 US


Scott Probasco



Basavaraj Patil Cisco Systems 2250 East President George Bush Highway Richardson, TX 75082 US