5 MBS minimum performance requirements

37.1713GPPRelease 16TSUniversal Terrestrial Radio Access (UTRA) and Evolved UTRA (E-UTRA)User Equipment (UE) performance requirements for RAT-Independent positioning enhancements

5.1 General

The minimum performance requirements specified in clause 5 apply for UEs that support MBS. This section applies to requirements for NR, UTRA, and E-UTRA.

The code phase accuracy requirements in this clause are statistical in nature and pertain to the 90th percentile of the distribution.

The measurement time for each requirement shall be TMBS_meas as described in clause 4.2.3. This clause does not include nor consider delays occurring in the various signalling interfaces of the network.

5.2 Sensitivity

A Sensitivity requirement is essential for verifying the performance of MBS receiver in weak signal conditions. In order to test the most stringent signal levels for the beacons the Sensitivity test case is performed in AWGN channel. This test case verifies the UE MBS performance at the lowest expected signal levels.

In MBS deployments, target sensitivity levels of -130 dBm (at the UE antenna connector, across the signal bandwidth) are used.

The minimum requirements for Sensitivity are shown in Table 5.2-1.

Table 5.2-1: Requirements for Sensitivity

MBS Configuration

Signal Strength (dBm)

Code phase measurement accuracy (ms)

TB1 (2 MHz) [7]

-130

1.66 10-4

TB1 (5 MHz) [7]

-130

6.64 10-5 (Release 14 onwards)

The test case requirements for Sensitivity measurement accuracy can be found in clause A.4.2.

5.3 Nominal Accuracy

The Nominal Accuracy requirement verifies the UE MBS performance under ideal conditions. The primary aim of the test is to ensure good accuracy when the MBS signal conditions allow it.

In this requirement AWGN channel model is used and the signal level is above the noise floor.

The minimum requirements for Nominal are shown in Table 5.3-1.

Table 5.3-1: Requirements for Nominal Accuracy

MBS Configuration

Signal Strength (dBm)

Code phase measurement accuracy (ms)

TB1 (2 MHz) [7]

-30

5.0 10-5

TB2 (5 MHz) [7]

-30

2.0 10-5 (Release 14 onwards)

The test case requirements for Nominal measurement accuracy can be found in clause A.4.2.

5.4 Dynamic Range

The Dynamic Range requirement is targeted at testing the performance of the MBS receiver under time varying signal conditions. This test case is important for a system such as MBS where the time slotting of beacons is used.

The maximum signal level of a MBS beacon is expected to be -30 dBm (at the UE antenna connector). This can be shown theoretically by assuming a TX power of +40 dBm and a minimum coupling loss between the transmitter and the UE of 70 dB [5].

For this requirement, the power level of the MBS beacons shall be alternated between the strongest and the weakest expected levels across consecutive slots in the MBS transmission period.

The minimum requirements for Dynamic Range are shown in Table 5.4-1.

Table 5.4-1: Requirements for Dynamic Range

MBS Configuration

Signal Strength (dBm)

Code phase measurement accuracy (ms)

TB1 (2 MHz) [7]

-30

5.0 10-5

-130

1.66 10-4

TB2 (5 MHz) [7]

-30

2.0 10-5 (Release 14 onwards)

-130

6.64 10-5 (Release 14 onwards)

The test case requirements for Dynamic Range measurement accuracy can be found in clause A.4.2.

5.5 Multipath

The purpose of the test case is to verify the receiver’s tolerance to multipath.

The pedestrian channel model used in TS 37.571-1 [9], captured in Annex B of TS 36.521-1 [10] is used for assessing the MBS performance under the multipath scenario, specifically the Extended Pedestrian A (EPA) with a maximum Doppler frequency of 5 Hz (EPA 5Hz).

The minimum requirements for the Multipath scenario are shown in Table 5.5-1.

Table 5.5-1: Requirements for Multipath scenario

MBS Configuration

Direct Path Signal Strength (dBm)

Code phase measurement accuracy (ms)

TB1 (2 MHz) [7]

-30

1.66 10-4

The test case requirements for Multipath measurement accuracy can be found in clause A.4.3.