PPA의 간섭을 최소화하기 위해 PPA 외부에 있지만 PPA 근처에 있는 CBSD는 PAL 채널의 전력을 줄여야 할 수 있습니다. PPA 내의 다른 운영자가 배포한 새 CBSD는 PAL 채널에 대한 지원금을 요청할 수 없습니다. SAS 포털에서 PPA를 찾는 방법 알아보기
SAS는 하나 이상의 PAL 보호 CBSD의 서비스 지역을 기반으로 동일한 PAL 채널에 대해 카운티 내에 하나 이상의 PPA를 만들 수 있습니다. PPA는 서비스 지역의 크기에 따라 확장, 병합, 분할, 축소할 수 있으므로 동적입니다. SAS는 PPA가 동일한 채널에 있고 동일한 카운티에 있는 경우 겹치는 PPA를 단일 PPA로 병합합니다. PPA는 SAS 간 조정된 주기적 활동 (CPAS) 중에 매일 업데이트됩니다.
CBSD에 PPA 설정
CPAS 전, 도중, 후에 CBSD의 PPA를 설정할 수 있습니다.
CPAS 이전
CPAS 2시간 전에 PAL 채널에 대한 지원금을 요청합니다. 이는 CPAS 중에 SAS가 PPA를 생성하도록 하기 위함입니다. GAA 부여를 받은 CBSD의 보호는 그 후에 시작됩니다.
PAL 채널의 품질 점수가 높지 않지만 장비에서 여러 부여를 지원하는 경우 PAL 부여가 CPAS를 완료할 때까지 다른 부여를 사용하여 전송합니다. 이렇게 하면 PAL 보호가 시작되기 전에 간섭의 위험과 영향을 최소화할 수 있습니다.
CPAS 중
CBSD는 PAL 부여에서 계속 하트비트를 유지하는 것이 좋습니다. 새 PPA가 보호되기까지 시간이 걸립니다. PPA 내의 다른 운영자의 CBSD는 CPAS가 완료될 때까지 PAL 채널을 사용할 수 있으므로 PAL 채널에 간섭이 발생할 수 있습니다.
CPAS 후
PPA 보호는 CPAS가 완료된 후에 시작됩니다. SAS는 PPA 내에 있는 다른 운영자의 CBSD에 대한 PAL 채널의 모든 부여를 종료합니다.
CBSD는 전송 승인을 받기 위해 하트비트를 전송합니다.
CBSD는 PAL 채널의 다른 CBSD 간섭으로부터 보호됩니다.
[[["이해하기 쉬움","easyToUnderstand","thumb-up"],["문제가 해결됨","solvedMyProblem","thumb-up"],["기타","otherUp","thumb-up"]],[["이해하기 어려움","hardToUnderstand","thumb-down"],["잘못된 정보 또는 샘플 코드","incorrectInformationOrSampleCode","thumb-down"],["필요한 정보/샘플이 없음","missingTheInformationSamplesINeed","thumb-down"],["번역 문제","translationIssue","thumb-down"],["기타","otherDown","thumb-down"]],["최종 업데이트: 2025-09-04(UTC)"],[],[],null,["# Manage PAL Protection Areas\n\nA [PAL Protection Area (PPA)](/spectrum-access-system/docs/key-terms#ppa) is\na geographic area protected from [General Authorized Access (GAA)](/spectrum-access-system/docs/key-terms#gaa)\ninterference when a [Priority Access License (PAL)](/spectrum-access-system/docs/key-terms#pal)\noperator uses a PAL channel. In this document, you learn how to manage and set up a\nPPA for your CBSDs.\n\nPPAs in Spectrum Access System (SAS) are generated automatically for each\nPAL-qualified Citizens Broadband Radio Service Device (CBSD) that requests a grant on an operator's\nPAL channels. The size and shape of a PPA are determined by the following:\n\n- The location of the CBSD.\n- The CBSD's Effective Isotropic Radiated Power (EIRP) capability as specified by the registration request, up to the FCC-certified limit.\n- The CBSD's antenna height, gain, azimuth, and beamwidth.\n- A standard [WInnForum](/spectrum-access-system/docs/key-terms#winforum)-defined propagation model used by all SASs.\n\nTo minimize interference to the PPA, CBSDs located outside but\nnear the PPA might have to reduce power on the PAL channel. Any new\nCBSDs deployed by another operator within the PPA cannot request\ngrants for the PAL channel. [Learn how to find a PPA in the SAS Portal](/spectrum-access-system/docs/use-pals#showpal).\n\nSAS might create one or multiple PPAs within a county for the\nsame PAL channel based on the service areas of one or more PAL-protected\nCBSDs. PPAs are dynamic because they can grow, merge, split, and\nshrink based on the size of the service areas. The SAS merges\nPPAs that overlap into a single PPA when those PPAs are on the same channel and\nin the same county. PPAs are updated daily during\n[Coordinated Periodic Activities among SASs (CPAS)](/spectrum-access-system/docs/key-terms#cpas).\n\nSet up a PPA for your CBSD\n--------------------------\n\nYou can set up a PPA for your CBSD before, during, and after\nCPAS.\n\n**Before CPAS**\n\n- Request a grant on your PAL channels two hours before CPAS. This is to ensure that SAS creates a PPA during CPAS. Protection from CBSDs that have GAA grants begins afterwards.\n- If your PAL channel [doesn't have a high quality score](/spectrum-access-system/docs/cbsd/channels#channel-quality), and your equipment supports multiple grants, use a different grant to transmit until your PAL grant successfully finishes CPAS. This minimizes the risk and impact of interference before PAL protection begins.\n\n**During CPAS**\n\nWe recommend that your CBSD keeps heartbeating on your PAL\ngrant. New PPAs take time to get protected. Other operators'\nCBSDs within the PPA might use the PAL channel until CPAS has\ncompleted, so your PAL channel might experience interference.\n\n**After CPAS**\n\n- The PPA protection begins after CPAS is completed. SAS\n terminates all grants on the PAL channel for other operators'\n CBSDs located within the PPA.\n\n- The CBSD sends heartbeats to receive authorization to transmit.\n Your CBSD is protected from interference from other\n CBSDs on the PAL channel.\n\n- If you experience interference on your PAL channel after the PPA is created,\n contact [SAS Support](/spectrum-access-system/docs/getting-support).\n\nMaintain a PPA for a PAL-protected CBSD\n---------------------------------------\n\nTo maintain a PPA for a PAL-protected CBSD, follow these steps:\n\n1. Continue heartbeating on the PAL grant. If the CBSD does not\n receive a heartbeat on a PAL grant for seven days, the CBSD's\n PPA is removed.\n\n | **Note:** If you use multiple PAL grants and miss heartbeats on one PAL grant, only the PPA associated with that grant is removed. If the CBSD continues to heartbeat on the remaining PAL grants, then the PPAs for the remaining grants are still enforced.\n2. If a PPA is removed from a PAL-protected CBSD,\n [re-establish a PPA](#re-establish-ppa).\n\n| **Tip:** If you relinquish a PAL grant and request a new one within the same day, it does not affect the PPA.\n\nRe-establish a dropped PPA\n--------------------------\n\nTo re-establish a PPA, do not re-register the CBSD. We strongly\ndiscourage re-registration because all of the CBSD's other\ngrants are relinquished and might not be available immediately after\nre-registration.\n\nTo re-establish a dropped PPA, do the following:\n\n1. [Request a new PAL grant](/spectrum-access-system/docs/use-pals) for the same channel.\n2. Wait for the next CPAS cycle.\n3. After the next CPAS cycle, the PPA is established.\n\nWhat's next\n-----------\n\n- Learn how to [use PALs in the SAS Portal](/spectrum-access-system/docs/use-pals).\n- Learn about [SAS sync (or IAP)](/spectrum-access-system/docs/sas-sync).\n- Learn about [Spectrum Access System](/spectrum-access-system/docs/overview).\n- Learn about [key SAS terms](/spectrum-access-system/docs/key-terms).\n- [Troubleshoot SAS issues](/spectrum-access-system/docs/troubleshooting)."]]
