4.8 Soft handover

32.4053GPPPerformance Management (PM)Performance measurementsRelease 17Telecommunication managementTSUniversal Terrestrial Radio Access Network (UTRAN)

4.8.1 Radio link additions to active link set (UE side)

4.8.1.0 Introduction

The three measurement types defined in the subclause 4.8.1.n for the radio link additions to active link set (UE side) are subject to the "2 out of 3 approach".

4.8.1.1 Attempted radio link additions to active link set (UE side)

  1. This measurement provides the number of attempted radio link additions during active link set update procedure (UE side) for each cell. This measurement shall be increased for each attempted radio link addition (UE side). This measurement is only valid for FDD mode.
  2. CC
  3. Transmission of an ACTIVE SET UPDATE message (RRC) by the serving RNC to the UE. Within an ACTIVE SET UPDATE message more than one radio link can be added. Each existing radio link addition information element shall be considered separately (see TS 25.331 [4]).
  4. A single integer value
  5. SHO.AttRLAddUESide.
  6. UtranCellFDD
  7. Valid for circuit switched and packet switched traffic
  8. UMTS

4.8.1.2 Successful radio link additions to active link set (UE side)

  1. This measurement provides the number of successful radio link additions during active link set update procedure (UE side) for each cell. This measurement shall be increased for each successful radio link addition (UE side). This measurement is only valid for FDD mode.
  2. CC
  3. Receipt of an ACTIVE SET UPDATE COMPLETE message (RRC), sent by the UE to the SERVING RNC, in response to an ACTIVE SET UPDATE message with one or more existing radio link addition information element. One ACTIVE SET UPDATE COMPLETE message can be related to more than one added radio link. Each successful added radio link shall be considered separately (see TS 25.331 [4]).
  4. A single integer value
  5. SHO.SuccRLAddUESide.
  6. UtranCellFDD
  7. Valid for circuit switched and packet switched traffic
  8. UMTS

4.8.1.3 Failed radio link additions to active link set (UE side)

  1. This measurement provides the number of failed radio link additions during active link set Update procedure (UE side) for each cell per cause. For each failure cause a separate subcounter is defined. Every failed radio link addition (UE side) shall be considered separately. This measurement is only valid for FDD mode.
  2. CC
  3. Receipt of an ACTIVE SET UPDATE FAILURE message (RRC) sent by UE to the UTRAN in response to an ACTIVE SET UPDATE message with non-empty radio link addition information element or an expected ACTIVE SET UPDATE COMPLETE message not received by the RNC. Each message can be related to more than one radio link.

– Each failed attempt to add a radio link shall be considered separately and added to the relevant per cause measurement. Failure causes are defined within TS 25.331 [4].

– Each expected ACTIVE SET UPDATE COMPLETE message not received by the RNC is added to the measurement cause ‘No Reply’ (not specified in TS 25.331 [4]).

– The sum of all supported per cause measurements shall equal the total number of failures. In case only a subset of per cause measurements is supported, a sum subcounter will be provided first.

  1. Each measurement is an integer value. The number of measurements is equal to the number of causes supported plus a possible sum value identified by the .sum suffix.
  2. The measurement name has the form SHO.FailRLAddUESide.Cause
    where Cause identifies the failure cause.
    The cause ‘No Reply’ is identified by the .NoReply suffix.
  3. UtranCellFDD
  4. Valid for circuit switched and packet switched traffic
  5. UMTS

4.8.2 Radio link deletions from active link set (UE side)

4.8.2.1 Attempted radio link deletions from active link set (UE side)

a) This measurement provides the number of attempted radio link deletions during active link set update procedure (UE side) for each cell. This measurement shall be increased for each attempted radio link deletion (UE side). This measurement is only valid for FDD mode.

b) CC

c) Transmission of an ACTIVE SET UPDATE message (RRC) by the SERVING RNC to the UE. Within an ACTIVE SET UPDATE message more than one radio link can be removed. Each existing radio link removal information element shall be considered separately (see TS 25.331 [4]).

d) A single integer value

e) SHO.AttRLDelUESide.

f) UtranCellFDD

g) Valid for circuit switched and packet switched traffic

h) UMTS

4.8.2.2 Successful radio link deletions from active link set (UE side)

a) This measurement provides the number of successful radio link deletions during active link set update procedure (UE side) for each cell. This measurement shall be increased for each successful radio link deletion (UE side). This measurement is only valid for FDD mode.

b) CC

c) Receipt of an ACTIVE SET UPDATE COMPLETE message (RRC) sent by UE to the Serving RNC in response to an ACTIVE SET UPDATE message with one or more existing radio link removal information element. One ACTIVE SET UPDATE COMPLETE message can be related to more than one deleted radio link. Each successful deleted radio link shall be considered separately (see TS 25.331 [4]).

d) A single integer value

e) SHO.SuccRLDelUESide.

f) UtranCellFDD

g) Valid for circuit switched and packet switched traffic

h) UMTS

4.8.3 Measurements related to the soft handover radio link

4.8.3.0 Introduction

The following measurements are provided at the best UTRAN cell of the active set (UE side).

The "best" FDD cell has the largest value when the measurement quantity is "Ec/No" or "RSCP". On the other hand, the "best" cell has the smallest value when the measurement quantity is "Pathloss". See TS 25.331 [4].

The other UTRAN cell is other than the best UTRAN cell of active set (UE side).

4.8.3.1 Mean number of the radio link established by the best UTRAN cell

a) This measurement provides the mean number of the radio link established by the measured UTRAN cell that is the best UTRAN cell of active set (UE side).

b) SI.

c) This measurement is obtained by RNC sampling at a pre-defined interval the number of the radio link established by the best UTRAN cell of active set (UE side), and then taking the arithmetic mean.

d) A single integer value

e) SHO.MeanNbrRLEstab.

f) UtranCellFDD

g) Valid for circuit switched and packet switched traffic

h) UMTS

4.8.3.2 Mean number of the radio link established by other UTRAN cell

a) This measurement provides the mean number of the radio link established by other UTRAN cell that is other than the best UTRAN cell of active set (UE side), also the best UTRAN cell of active set (UE side) is measured UTRAN cell.

b) SI.

c) This measurement is obtained by RNC sampling at a pre-defined interval the number of the radio link established by the other UTRAN cell that is other than the best UTRAN cell of active set (UE side), and then taking the arithmetic mean.

d) A single integer value

e) SHO.MeanNbrRLEstabByOthCell.

f) UtranCellFDD

g) Valid for circuit switched and packet switched traffic

h) UMTS