4.4 RRC connection establishment

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

4.4.1 RRC connection establishments

4.4.1.0 Introduction

The three measurement types defined in the clause 4.4.1.n are subject to the "2 out of 3 approach".

4.4.1.1 Attempted RRC connection establishments

  1. This measurement provides the number of RRC connection establishment attempts for each establishment cause.
  2. CC
  3. Receipt of an RRC Connection Request message by the RNC from the UE. Each RRC Connection Request message received is added to the relevant per cause measurement. The possible causes are included in TS 25.331 [4]. The sum of all supported per cause measurements shall equal the total number of RRC Connection Establishment attempts. In case only a subset of per cause measurements is supported, a sum subcounter will be provided first.
  4. Each measurement is an integer value. The number of measurements is equal to the number of causes plus a possible sum value identified by the .sum suffix.
  5. The measurement name has the form RRC.AttConnEstab.Cause
    where Cause identifies the Establishment Cause.
  6. UtranCellFDD
    UtranCellTDDLcr
    UtranCellTDDHcr
  7. Valid for circuit switched and packet switched traffic
  8. UMTS

4.4.1.2 Failed RRC connection establishments

a) This measurement provides the number of RRC establishment failures for each rejection cause.

b) CC

c) Transmission of an RRC Connection Reject message by the RNC to the UE or an expected RRC CONNECTION SETUP COMPLETE message not received by the RNC. Each RRC Connection Reject message received is added to the relevant per cause measurement. The possible causes are included in TS 25.331 [4].
Each expected RRC CONNECTION SETUP COMPLETE not received by the RNC is added to the measurement cause ‘No Reply’ (not specified in TS 25.331 [4]). Each RRC connection which is not established because the cell is going to Energy Saving mode is added to the measurement cause ‘EnergySaving’ (not specified in TS 25.331 [4])
The sum of all supported per cause measurements shall equal the total number of RRC Connection Establishment Failures. In case only a subset of per cause measurements is supported, a sum subcounter will be provided first.

d) Each measurement is an integer value. The number of measurements is equal to the number of causes plus a possible sum value identified by the .sum suffix.

e) The measurement name has the form RRC.FailConnEstab.Cause
where Cause identifies the Rejection Cause.
The cause ‘No Reply’ is identified by the .NoReply suffix.
The cause ‘Energy Saving’ is identified by the .EnergySaving suffix.

f) UtranCellFDD
UtranCellTDDLcr
UtranCellTDDHcr

g) Valid for circuit switched and packet switched traffic.

h) UMTS.

i) One usage of this measurement is to support the coverage ratio (CR) calculation for EE coverage area determination in [21].

4.4.1.3 Successful RRC connection establishments

a) This measurement provides the number of successful RRC establishments for each establishment cause.

b) CC

c) Receipt by the RNC of a RRC CONNECTION SETUP COMPLETE message following a RRC establishment attempt. Each RRC Connection Setup Complete message received is added to the relevant per cause measurement. The possible causes are included in TS 25.331 [4]. The sum of all supported per cause measurements shall equal the total number of RRC Connection Establishments. In case only a subset of per cause measurements is supported, a sum subcounter will be provided first.

d) Each measurement is an integer value. The number of measurements is equal to the number of causes plus a possible sum value identified by the .sum suffix.

e) The measurement name has the form RRC.SuccConnEstab.Cause
where Cause identifies the Establishment Cause.

f) UtranCellFDD
UtranCellTDDLcr
UtranCellTDDHcr

g) Valid for circuit switched and packet switched traffic.

h) UMTS.

i) One usage of this measurement is to support the coverage ratio (CR) calculation for EE coverage area determination in [21].

4.4.2 RRC connection establishment setup time

4.4.2.1 RRC connection set-up time (Mean)

  1. This measurement provides the mean time per establishment cause it takes for the RNC to establish a RRC connection during each granularity period. The measurement is split into subcounters per establishment cause.
  2. DER (n=1)
  3. This measurement is obtained by accumulating the time intervals for every successful RRC connection establishment per establishment cause between the receipt by the RNC from the UE of a "RRC CONNECTION REQUEST" and the corresponding "RRC CONNECTION SETUP COMPLETE" message over a granularity period using DER. The end value of this time will then be divided by the number of successful RRC connections observed in the granularity period to give the arithmetic mean, the accumulator shall be reinitialised at the beginning of each granularity period. The measurement is split into subcounters per establishment cause, see TS 25.331 [4].

Figure

  1. Each measurement is an integer value.(in milliseconds)
  2. RRC.AttConnEstabTimeMean.Cause
    where Cause identifies the Establishment Cause.
  3. UtranCellFDD
    UtranCellTDDLcr
    UtranCellTDDHcr
  4. Valid for circuit switched and packet switched traffic
  5. UMTS

4.4.2.2 RRC connection set-up time (Max)

a) This measurement provides the maximum time per establishment cause it takes for the RNC in order to establish a RRC connection during each granularity period. The measurement is split into subcounters per establishment cause.

b) GAUGE

c) This measurement is obtained by monitoring the time intervals for each successful RRC connection establishment per establishment cause between the receipt by the RNC from the UE of a "RRC CONNECTION REQUEST" and the corresponding "RRC CONNECTION SETUP COMPLETE" message, see TS 25.331 [4]. The high tide mark of this time will be stored in a gauge, the gauge shall be reinitialised at the beginning of each granularity period. The measurement is split into subcounters per establishment cause.

Figure

d) Each measurement is an integer value.(in milliseconds)

e) RRC.AttConnEstabTimeMax.Cause
where Cause identifies the Establishment Cause.

f) UtranCellFDD
UtranCellTDDLcr
UtranCellTDDHcr

g) Valid for circuit switched and packet switched traffic

h) UMTS

4.4.3 RRC connection usage

4.4.3.1 General

The amount of RRC connections can be used to indicate user loading levels.

4.4.3.2 RRC connection usage (Mean)

1) This measurement provides the average number of simultaneous RRC connections.

2) SI

3) This measurement is obtained by sampling at a pre-defined interval, the amount of successful RRC connections for each UtranCell and then taking the arithmetic mean.

4) A single integer value

5) RRC.MeanConn

6) UtranCellFDD
UtranCellTDDLcr
UtranCellTDDHcr

7) Valid for circuit switched and packet switched traffic

8) UMTS

4.4.3.3 RRC connection usage (Maximum)

a) This measurement provides the maximum number of simultaneous RRC connections.

b) SI

c) This measurement is obtained by sampling at a pre-defined interval, the amount of successful RRC connections for each UtranCell and then taking the maximum.

d) A single integer value

e) RRC.MaxConn.

f) UtranCellFDD
UtranCellTDDLcr
UtranCellTDDHcr

g) Valid for circuit switched and packet switched traffic

h) UMTS

4.4.3.4 RRC connection usage per UE multi-mode/multi-RAT capability

a) This measurement provides RRC connection usage in utran cell per UE multi-mode/multi-RAT capability. The measurement is split into subcounters per UE multi-mode/multi-RAT capability. (See TS 25.331 [4] Clause 10.3.3.41).

b) DER (n=1)

c) This measurement is obtained by accumulating the time intervals for every successful RRC connection between the receipt of a RRC CONNECTION SETUP COMPLETE and transmission of the corresponding RRC CONNECTION RELEASE message by the RNC. The possible UE multi-mode/multi-RAT capabilities are included in TS 25.331 [4] Clause 10.3.3.41. One or more subcounters are stepped based on received UE multi-mode/multi-RAT capabilities.

d) Each measurement is an integer value. (in seconds)

e) RRC.ConnUsage.fdd

RRC.ConnUsage.tdd

RRC.ConnUsage.fdd-tdd

RRC.ConnUsage.supportOfGSM

RRC.ConnUsage.supportOfMulticarrier

RRC.ConnUsage.supportOfEUTRAFDD

RRC.ConnUsage.supportOfEUTRATDD

f) UtranCellFDD
UtranCellTDDLcr
UtranCellTDDHcr

g) Valid for circuit switched and packet switched traffic

h) UMTS