ETSI, an independent association that produces globally-applicable standards for information and communications technology, has announced that its technical committee for reconfigurable radio systems (TC RRS) has completed the specification for the support of Licensed Shared Access (LSA), which will enable spectrum sharing coordination between LSA licensees and existing spectrum licensees.

The recently completed specification, ETSI TS 103 379 addresses information elements and protocols for the operation of LSA in the 2,300MHz-2,400MHz band. The document defines the application protocol, also known as LSA1 protocol, on the interface between the LSA Controller and the LSA Repository.

ETSI TC RRS's new specification completes the group's set of specifications that will allow interoperable implementation of LSA Repositories and LSA Controllers to support LSA deployments in the initial target band (2,300MHz-2,400MHz). Extensions to other bands are not precluded, in response to future regulatory requirements. It is the intention to take such future requirements as well as additional features into consideration when starting a new release of the LSA specifications, according to the association.

In the LSA architecture, the LSA repository contains information on spectrum resource availability, which is dependent on existing current holder of spectrum rights of use required usage and in accordance with each country’s specific regulatory regime. The LSA Controller resides in the network operator’s domain to ensure that the network configuration complies with the instructions received from the LSA Repository. The LSA1 protocol thus provides a reliable and flexible means to ensure that the information is synchronised between controller and repository, including confirmation of compliance by the LSA Controller after any change of restrictions.

The ETSI work was initiated in response to the European Commission’s Mandate M/512 on RRS, and closely followed related CEPT work, particularly the ECC Report 205 on “Licensed Shared Access.” It completes and complements existing ETSI specifications including:

  • ETSI TR 103 113: System Reference document (SRdoc); Mobile broadband services in the 2,300MHz-2,400MHz frequency band under Licensed Shared Access regime
  • ETSI TS 103 154: System requirements for operation of Mobile Broadband Systems in the 2,300MHz-2,400MHz band under Licensed Shared Access (LSA)
  • ETSI TS 103 235: System architecture and high level procedures for operation of Licensed Shared Access (LSA) in the 2,300MHz-2,400MHz band

Meanwhile, ETSI TC RRS has started new work to address the different technical possibilities for local high-quality wireless networks to access spectrum temporarily on a shared basis.