User`s guide

Agilent PXT Wireless Communications Test Set
User’s Guide
163
5 Handovers
There are many types of handovers (HO) that can be tested using the Agilent E6621A PXT. When discussing
handovers, it is helpful to understand some of the terms used. Table 5-1 below describes these terms, while
Table 5-2: LTE to LTE Handovers
and Table 5-3: I-RAT Handovers provide a brief description of each handover type
and the component requirements needed to perform them. For more detailed information regarding handovers, refer
to 3GPP 36.331.
Table 5-1: Handover Terms
Term
Description
Intra-
Frequency
EARFCN does not change. UE moves from one Cell ID to a new Cell ID.
Inter-
Frequency
EARFCN does change. UE moves to a new EARFCN, either within the current Band, or to
a new Band.
Redirection
The eNodeB (PXT) explicitly directs the UE to initiate a HO.
Reselection
Based upon monitored threshold conditions (for example, those defined in SIB4) the UE
initiates a HO request to a new serving cell; or if UE loses sync with the current cell, it
initiates a new network entry attempt to find an active cell.
i-RAT
inter-Radio Access Technology (for example, handovers between any two cellular
formats: LTE, eHRPD, WCDMA, GERAN, and so forth)
Optimized
Refers to a HO where the RRC is not released during HO (typically this term is only used
when describing iRAT HOs)
Non-
Optimized
Refers to a HO where the RRC is released during HO (typically this term is only used
when describing iRAT HOs)
LTE to LTE Handovers
The following table lists LTE to LTE handovers currently supported by the PXT.
Table 5-2: LTE to LTE Handovers
Handover
Description
Requirements
Intra-frequency
Redirection
(LTE to LTE)
- UE is redirected to move from one Cell (ID=X) to
a different Cell (ID= Y).
- EARFCN stays the same.
1 PXT + Option BB1* or
2 PXTs
Inter-frequency
Redirection
Example:
PXT to PXT
Handover
- UE is redirected from one EARFCN to a different
EARFCN.
- Cell ID of the two PXTs are set to two different
values to emulate two different Cells
- Band may change (only supported by 2 - PXT
configuration)
2 PXTs (BB1* is not
required)