1、 Rec. ITU-R M.1746 1 RECOMMENDATION ITU-R M.1746 Harmonized frequency channel plans for the protection of property using data communication (2006) Scope This Recommendation addresses system interoperability and harmonized frequency channel plans for the protection of property using data communicatio
2、n. The ITU Radiocommunication Assembly, considering a) that technologies exist and are being developed which facilitate, through public protection radiocommunication systems, the protection of property; b) that the usefulness of public protection radiocommunication systems for the protection of prop
3、erty have been and continue to be demonstrated using data transmissions; c) that many administrations wish to promote interoperability and interworking between systems used for public protection both nationally and for cross-border operations; d) that national spectrum planning for public protection
4、 radiocommunication systems need to have regard for cooperation and bilateral consultation with other concerned administrations, in order to facilitate greater levels of spectrum harmonization; e) that current public protection systems mostly require relatively low communications bandwidth, and may
5、use either narrow-band communication systems supporting voice and low data-rate applications, typically in channel bandwidths of 25 kHz or less, or spread spectrum technology; f) that to facilitate system interoperability and/or interworking, it is desirable that systems for the protection of proper
6、ty be developed under an open architecture without releasing sufficient information to allow systems to be easily countered; g) that a description of such frequency use and radiocommunication systems providing protection of property is given in Annex 1; h) that usage of the same frequencies of the s
7、ame allocation in particular ITU regions will enable administrations to benefit from harmonization while continuing to meet national planning requirements; j) that use of common frequencies within which radiocommunication equipment for the protection of property can operate, compatible technology, m
8、utual cooperation and consultation will ease the radiocommunication system interoperability and/or interworking of protection of property systems, 2 Rec. ITU-R M.1746 recognizing a) that a common frequency or a common frequency band may be available within each country; b) that countries use a varie
9、ty of frequency bands, technologies and applications for the protection of property; c) that several countries have implemented or are considering implementing protection of property systems, noting a) that many administrations use the same frequencies for narrow-band protection of property applicat
10、ions; b) that such applications on these frequencies can provide good signal availability over large coverage areas; c) that it is desirable to identify frequencies on a regional basis, which will permit spectrum channel harmonization for the protection of property; d) that these property protection
11、 applications are achieved through data transmissions; e) that data transmissions on harmonized spectrum will facilitate interoperability only with compatible technology; f) that Report ITU-R M.2033 encourages public protection agencies and organizations to utilize relevant ITU-R Recommendations in
12、planning spectrum use and implementing technology and systems supporting public protection; g) that Report ITU-R M.2033 also details the public protection agencies and organizations user requirements, including system requirements, security and cost; h) that ITU is emphasizing the need for ITU-R eff
13、orts on telecommunications for public protection, recommends 1 that administrations should cooperate with other administrations in their region to achieve harmonized frequency channel plans for protection of property systems and/or applications (such as stolen vehicle recovery). Appendix 1 presents
14、some frequency channel plans for the protection of property using data communications; 2 that techniques for ensuring interoperability of different systems should also be taken into account. Rec. ITU-R M.1746 3 Annex 1 Description of systems providing protection of property 1 Introduction This Annex
15、 provides a description of systems which provide for the recovery of stolen or missing property, and which thereby act as a deterrent against theft or tampering. It provides a functional description of such systems, as well as functional characteristics. It also includes a description of the systems
16、 radiocommunication parameters. 2 General system description Property protection systems require communications between a centralized, typically fixed control network, and many remote transceivers located with or within assets being protected. The control network is responsible for allocating and co
17、ntrolling transceiver identifiers, and may poll the transceivers either regularly, or on demand, specifically when an asset is reported as having been stolen. The control network may be operated by national authorities or responsible agencies and organizations, and in either case may have arrangemen
18、ts for cooperation with other property protection systems operating within the same or different countries. The transceiver may be configured to only respond to messages received from the control network, or initiate communications when it detects tampering or theft, or a combination of these. Syste
19、ms use a variety of communications, including fixed and mobile radio communications and private circuit and public telecommunications, depending on configuration and the mobility of the protected items. Transceivers may be configured to provide location information in their transmissions (e.g., deri
20、ved from a satellite navigation system), or systems may rely on triangulation or searches using mobile control units. The communications for property protection are often configured to provide high levels of coverage in traditionally difficult to reach locations such as underground garages and metal
21、lic shipping containers to which stolen items may be taken for concealment or modification. 3 System function How the different systems function depends on the system architecture. The control centre maintains a database of asset information comprising transceiver configuration and unique system ide
22、ntifiers, information on who may receive reports or instigate activity, and procedures to be followed when an alert is raised. Communications within the property protection network and between the network and transceivers attached to the protected assets are automated and under computer control, tho
23、ugh may be instigated manually, for example following a report of an asset being stolen. In systems which rely on the control centre to initiate or control transceiver activity (either configuration commands or requesting status responses), the communication may be either made directly through telep
24、hone lines for fixed assets, or through a network of many radio transmitters for either fixed or mobile assets. In other systems, the transceiver located with or within the asset being protected may initiate communications if it detects that tampering or theft is taking place. The communication may
25、once again be direct through the public telephone network, or by radio to one or more receiver sites configured to receive property protection messages and relay information back to the control centre. However the messages are instigated or communicated, the control centre will maintain a record, an
26、d as appropriate, involve or inform other organizations. 4 Rec. ITU-R M.1746 Radiocommunications may be used between the control centre and any remote transmitters and receivers belonging to the control network, in addition to those between the transceiver and the control network. Any such transmiss
27、ions within the control network would resemble normal telemetry and are not covered by this Recommendation, which concentrates on the communication between the control network and the protected device. These communications may be arranged in a variety of ways such that the transceiver responds on th
28、e same channel on which it receives commands, an adjacent channel, or using an entirely different channel or technology, for example receiving commands on a dedicated property protection channel and responding either through a call on a cellular telephone network, or using a shared, short-range chan
29、nel to receivers located with cellular base stations with which back-haul infrastructure is shared. It is normal for transceiver transmit power to be low, in order to minimize power drain and possible interference if the asset is taken outside of the coverage area of its own network, and this may en
30、courage the use of different bands and technologies for the receive and transmit segments. If assets may be moved across national boundaries, cooperation arrangements with property protection network operators in other countries are advantageous, as are commonly agreed or harmonized allocations and
31、assignments. The situation can be further improved by having transceivers listen for messages on several channels, and possibly accept commands with configuration instructions on which channel or technology to use for responses. Depending on the size and cost of the assets being protected, some tran
32、sceivers may include location information (possibly derived from satellite navigation systems) in their transmissions, while other networks may rely on localization through the received signal, either by triangulation or “homing“ with mobile receivers. While the main use of property protection syste
33、ms is expected to be for recovery of valuable, mobile items (vehicles, boats) following theft, property protection systems may also be used to monitor and report tampering in remote equipment (vending machines), track delivery vehicles to enhance security or provide better, up-to-date information on
34、 delivery schedules, or provide fall-back alert cover for emergency teams or shipments of money or other valuables. Each of these applications makes different demands on the property protection network, transceivers and communications, however a mixture can improve overall network utilization. 4 Rad
35、iocommunication characteristics These systems often interface with the public switched telephone network, paging or public cellular networks, and with other radiocommunication equipment at remote device locations. They typically operate in a frequency range from HF and up to about 1 GHz depending up
36、on the technology used, but many systems are operated in fixed and mobile service allocations in the range 100-900 MHz. 5 Interoperability Through the use of systems as described above, operating on the same frequency and using compatible system devices, the property which is being protected through
37、 recovery can be easily located if the property is in another country different from the one in which it was taken. Harmonization of frequencies for this type of application is particularly useful for interoperability between countries and to ease the burden of coordination for administrations. Pres
38、ently in Region 1 such systems use 25 kHz or 12.5 kHz channels, or broader channels if spread spectrum technologies are employed. In certain countries of Region 2 and in Region 3 a 25 kHz channel is used to provide these services. Rec. ITU-R M.1746 5 Appendix 1 Frequency channel plans for the protec
39、tion of property using data communications The frequencies below have already been assigned or are being considered for assignment for protection of property radiocommunication systems: In Region 1 Europe: Frequencies within the harmonized band 169.4-169.8125 MHz1Frequencies presently used in other
40、bands including 138.625 MHz, 138.650 MHz, 149.025 MHz, 162.050 MHz and 164.175 MHz on a national or multinational basis with agreement between administrations Arab States: No frequency has been agreed upon yet Africa: One channel centred at 169.200 MHz in two countries. In Region 2 CITEL has recomme
41、nded frequencies within the range 173.0-173.3 MHz. In Region 3 One channel centred at 163.475 MHz in some countries. 1In Europe, CEPT/ECC Decision (05)02 of 18 March 2005 “on the use of the frequency band 169.4-169.8125 MHz“ has been adopted, with provisions for both high and low power harmonized channels for asset tracking systems. An appropriate transition period may be required for existing systems in use on other frequencies which intend in the future to use those in the CEPT/ECC Decision.
