ISO IEC 21228:2019 pdf download

ISO IEC 21228:2019 pdf download.Information Telecommunications and information exchange between Coexistence mechanism for broadband powerline communication technologies
1 Scope
This document specifies the coexistence mechanism for various broadband powerline communication systems. By using the coexistence mechanism, possible harmful interference between different standard-based high-speed powerline communication systems can be avoided.
2 Norma tive references
The following documents are referred to in the text in such a way that some or all of their content constitutes requireme nt s of this document. For dated references, only the edition cited app lies. For undated references, the latest edition of the referenced document (including any amendments ] applies.
IEEE Std 1901-2010, IEEE Standard for Broadband over Power line Networks: Medium Access Control and Physical Layer
3 Terms and definitions
No terms and definitions are listed in this docume nt.
ISO and I EC maintain terminological databases for use in standardization at the following addresses:
IEC Electropedi a: available at htto://www.electronedia.org,/
ISO Online browsing platform: ava il able at http.:t,Lwww.iso.org,Lobp
5 Coexistence protocol
5.1 General This Cl ause specifies the coexistence protocol, which is part of the coexistence mechanism . Tbe coexistence protocol (CP) is meant to share time or frequency doma in resources for different non- interoperable systems, up to four on the same powerline at a time. Except for the number of non- interoperable systems and its re l ated changes (see IEEE Std 1901-2010, 16.5.2 ], the rest of the CP is the same as the inter-system protocol (ISP ) as specified in IEEE Std 1901-2010, 16 and ITU-T G99722010, 9.2. To share resources, the time domain multiplex (TDM) and the frequency domain multiplex (FDM) are used. See IEEE Std 1901-2010, 16.5.2 for the case of a network status consisting of access systems IH-W, IH- O, and IH-G. The TDM general resource allocation is extended to support another non-interoperable in-home system, denoted by IH-A, such as an ISO/IEC 12139-1 system, while the maximum number of non-interoperable systems supported at the same time remains unchanged as four. The following two extended schemes guarantee backward compatibility with the ISP of IEEE Std 1901-2010. . 5.2 Extended TDM resource allocation utilizing resource for an absent in-home system The first extended TDM resource allocation procedure starts with the TDM general resource allocation map and then assigns the TDMs of an absent in-home system to IH-A. This extended TDM resource allocation can be used only when there are any absent in-home systems; IH-A uses the TDMs originally allocated to the first absent in-home system in the order of IH-W, IH-O, and IH-G as shown in Table 1, which is the extended TDM resource allocation map utilizing TDMs of an absent in-home system. Note that this first extension doesn’t include utilizing resource for an access system even when all in-home systems are present.
When the IH-A system detects the newly connected absent in-home system, it stops utilizing the resource for the absent in-home system and starts utilizing the resource for the next absent in-home system if there is another absent in-home system. For example, consider the case of index= 10 or 11 in Table 1 when there are two absent in-home systems, IH-W and IH-0 as in Step 1 of Figure 1. Later when the IH-W system is newly connected, the IH-A system detects the IH-W system’s presence since the periodicity of its ISP window become 4 x TIsp as shown in Step 2 of Figure 1. Then, the IH-A system shall stop utilizing the resource for the IH-W system and start transmitting the ISP signals of IH-O with a periodicity of 8 x TIsp to utilize the resource for IH-O as shown in Step 3 of Figure 1.