February 2015
Intermediate to advanced
200 pages
4h 48m
Japanese
Content preview from Bluetooth Low Energyをはじめよう
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174
Bluetooth Low Energyをはじめよう 付録 Bluetoothコア規格バージョン4.2での変更点
いる（プレスリリース：https://www.nordicsemi.com/jpn/node_206/node_305/
Product-Related-News/Nordic-Semiconductor-nRF51-SoC-IPv6-over-
Bluetooth-Smart-IoT）。
実はIETF（インターネット技術の標準化団体）での標準化は現在進行中であり、文書
「Transmission of IPv6 Packets over BLUETOOTH(R) Low Energy（https://
datatracker.ietf.org/doc/draft-ietf-6lo-btle/）」 は ま だ Internet Draft（草案）の
段 階 だ 。つまり、IPv6 over BLEの通信方式については未確定の部分があり、今後変
更される可能性があることには注意しておく必要があるだろう。
性能の向上
性能に関して最大の改善点は、コネクション確立後のネゴシエーションによってリ
ンク 層 の パ ケットの 長さが 拡 張 できるようになったことだ（LE Data Packet Length
Extension）。 バ ー ジ ョ ン 4.1ま で は コ ネ ク シ ョ ン パ ケ ット の リ ン ク 層 で の 最 大 ペ イ ロ ー ド
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