Recommendation regulators may facilitate the setup of

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Recommendation: regulators may facilitate the setup of the synchronisation framework Regulators may facilitate the process to ensure fair and timely frame structure agreements in cases where agreements could be more challenging. The following bullets provide a brief summary for the recommended process. Before the assignment procedure: The Regulator should initially define the key elements for the synchronisation framework: The “Permissive” OOB limit 7 that is applied when a “Country preferred” frame structure is used; The “Restricted” OOB 8 limit that would need to be applied if a licensee chooses a different frame structure. 7. The “baseline limits and transitional limits” defined in ECC DEC (11)06-Table 3 for non-AAS and AAS BSs could be used. 8. The “restricted baseline limits” defined in ECC DEC (11)06-Table 4 for non-AAS and AAS BSs could be used. The agreement on the “Country preferred” frame structure should be reached by licensees within a certain timeline as soon as possible after the end of the assignment procedure. The regulator should define a “default Country preferred” frame structure which would be used if licence winners do not manage to agree on a common frame structure within a pre-defined time frame. Such a default frame structure should be carefully chosen by regulators so that it is consistent with MBB traffic trends and is the most appropriate for facilitating cross-border coordination with neighbouring countries. The regulator should clarify whether coexistence with existing LTE-TDD / WiMAX deployments in the band is required or not. The possible need to coexist with LTE-TDD would require the adoption of an “LTE-TDD compatible” NR frame structure leading to significant latency performance degradation. Such a decision is justified, during a limited transition period, until LTE-TDD is refarmed to NR. Limited LTE-TDD and WiMAX deployment should be refarmed / cleared from the start.b After the assignment procedure The licensees are asked to agree and commit to a common “Country preferred” frame structure and parameters. The Regulator should define a firm agreement deadline, after which, in the case of no agreement among MNOs, the “default Country preferred” frame structure is applied. During the deployment stage Licensees will implement the synchronised operation for their Macro-cellular networks. Licensees can decide to adopt the CA and SUL schemes with lower FDD bands to improve latency performance – see section “5G TECHNOLOGY ENHANCEMENTS”. Frame structure and parameters can be re- negotiated over time (e.g. if new major traffic trends emerge). NATIONAL SYNCHRONISATION FRAMEWORKS To avoid interference between adjacent spectrum owners, GSA recommends the synchronised operation among operators (adopting a common clock reference and a common frame structure) within one country and, as much as possible, between countries where interference needs to be controlled.

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