Band 23 is a major FDD band which has been allocated in the US. The US regulatory rules require strict power and
emissions limits for the UE operating in Band 23 in order to protect adjacent operations below 2000 MHz. A new
network-signalled value (NS_20), along with accompanying A-MPR tables, is established in TS 36.101 for Band 23 for
5, 10, 15 and 20 MHz channel bandwidths.
An intra-band contiguous carrier aggregation for Band 23 is needed to exploit the full 20 MHz downlink spectrum
available in the band without allocating a matching 20 MHz uplink carrier. The suggested intra-band contiguous carrier
aggregation allows Band 23 operator(s) to select different uplink carrier sizes with varying degrees of A-MPR
restrictions, without sacrificing the full downlink capacity. The only deployment scenario for this aggregation would
involve two downlink (DL) component carriers with a single uplink (UL) component carrier.
In current RAN4 carrier aggregation (CA) work, several intra-band cases have been approved, studied, and discussed to
determine feasibility and the RF requirements needed to introduce such scenarios. These include intra-band scenarios
where the applicable LTE frequency band is situated at or near 2 GHz (for instance, Band 3, Band 4, and Band 25).
Also, the WI for intra-band contiguous CA case involving CA Bandwidth Class B configuration was approved for Band
27 [RP-130173]. Building on these earlier intra-band carrier aggregation precedencies, the referenced work item [RP-130652] proposes to
start the work on intra-band contiguous carrier aggregation for Band 23 to support deployment of LTE-advanced.
The present document is a technical report of the work item for LTE Advanced intra-band contiguous Carrier
Aggregation in Band 23, which was approved at TSG RAN #60.
The report provides background, analysis of the
requirements, and a list of recommended changes to the specifications.