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<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> </header>  <div class="articleBody p-article_body"> <div class="p-article_wordCount">全1793文字</div> <div class="p-article_ad"> <ul class="none"> <li> <div id="div-gpt-ad-category_textad_leaf_top_01"> <script type="text/javascript"> googletag.cmd.push(function() { googletag.display('div-gpt-ad-category_textad_leaf_top_01'); }); </script> </div> </li><li> <div id="div-gpt-ad-category_textad_leaf_top_02"> <script type="text/javascript"> googletag.cmd.push(function() { googletag.display('div-gpt-ad-category_textad_leaf_top_02'); }); </script> </div> </li><li> <div id="div-gpt-ad-category_textad_leaf_top_03"> <script type="text/javascript"> googletag.cmd.push(function() { googletag.display('div-gpt-ad-category_textad_leaf_top_03'); }); </script> </div> </li></ul> </div> <p>　スマートフォンをポケットに入れてクルマに近づけばドアの鍵が開く――。一部の車種にのみ搭載されていたこうした機能が2025年以降に一般化しそうだ。きっかけは、Bluetooth SIGが新たに規格化した「チャネルサウンディング（Channel Sounding：CS）」という技術がスマホやクルマに組み込まれることである。</p> <p>　CSは、Bluetooth SIGが2024年8⽉に発行した「Bluetooth v6.0」で新たに追加された測距技術である。Bluetoothの送信機間をセンチメートル程度の誤差で計測できる。そのため、ユーザーがクルマの周囲にいるときにのみ、鍵を開けるといったことが可能になるわけだ。</p> <p>　実はこれまでにも、UWB（Ultra Wide Band、超広帯域）によって同様のアプリケーションが一部の車種で実現されてきた。ただし、UWBの無線機を搭載するスマホは米Apple（アップル）の「iPhone」シリーズや米Google（グーグル）の「Pixel」シリーズなどに限られていた。また、クルマ側でもUWBのために専用の無線機を設置しなければならず、搭載へのハードルがあった。</p> <p>　しかし、Bluetoothはほぼすべてのスマホやクルマに搭載される無線技術だ。「CSに対応するためには（Bluetooth v6.0以降に対応した）新しいハードウエアが必要になる」（Bluetooth SIG テクニカルマーケティングディレクターのデーモン・バーンズ氏）ものの、ユーザーがスマホを新機種に買い替えれば、順次スマホ側の準備が整うことになる。クルマメーカーはそれを前提に車両を設計できる。Bluetooth v6.0に対応した半導体は、2024年中に準備が整い、2025年には搭載した最終製品が登場する見込みだ。 </p> <p> 　また、CSについては、最新OSであるAndroid 15のアップデート版QPR（Quarterly Platform Release）3で対応することが決まっている。iPhoneのCS対応に関してはAppleは何も表明しておらず、Bluetooth SIG側も「個別の企業の戦略については語る立場にない」（バーンズ氏）とする。とはいえ「AppleはBluetooth SIGの（普及を主導する）プロモーターの立場にあり、（CSに関して）友好的に話し合いが行われている」（バーンズ氏）としており、Bluetoothチップ側の準備が整えば、CSに対応してくると見て間違いないだろう。</p> <p>　クルマへの搭載については「メーカーや車種は言えないが、2025年にCSを使ったデジタルキーに対応した車両が発売される」（バーンズ氏）ようだ。なお、自動車部品メーカーとしてデンソーがCSへの支持を表明している。</p>  <div id="div-gpt-ad-inread"> <script type="text/javascript"> googletag.cmd.push(function() { googletag.display('div-gpt-ad-inread'); }); </script> </div><nav class="pagenation p-pagenation"> <p class="textAlignCenter">この記事は有料会員限定です。次ページでログインまたはお申し込みください。</p> <p class="p-pagenation_nextPage"><a href="/atcl/nxt/column/18/00001/10013/?P=2">次ページ <span class="p-pagenation_nextPage_title">CS測距でリレーアタックを検出</span></a></p> <ul class="p-pagenation_list"> <li class="p-pagenation_list_item -current">1</li> <li class="p-pagenation_list_item"><a href="/atcl/nxt/column/18/00001/10013/?P=2">2</a> <li class="p-pagenation_list_item -next"><a 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