6.4A Output pattern dynamics

25.1013GPPRelease 17TSUser Equipment (UE) radio transmission and reception (FDD)

An F-TPICH carries transmitted precoding indicator generated at layer 1 for UL CLTD operation.

6.4A.1 Out-of-quality handling of TPI applicability

The UE shall measure the reliability of the received TPI bits over the 3 slot period in which the TPI bit pattern corresponding to a precoding weight is received, as specified in TS 25.214 [8]. The received TPI bits are mapped to precoding weights and applied by the UE only if the estimated quality of the TPI bits is determined to be better than a threshold Q_tpi. Otherwise, the UE shall apply the precoding weights corresponding to the last reliably received TPI bit pattern. The threshold is not defined explicitly, but is defined by the conditions under which the UE shall apply the precoding weights corresponding to the received TPI bits and apply the precoding weights corresponding to the last reliably received TPI bits, as stated in this subclause.

The threshold Q_tpi should correspond to a level of F-TPICH quality below which no reliable detection of the TPI bits transmitted on the downlink DPCCH can be made.

6.4A.1.1 Minimum requirement

When the UE estimates the F-TPICH quality received over the 3 slot period to be worse than a threshold Q_tpi, the UE shall apply the precoding weights corresponding to the last reliably received TPI bit pattern. The UE shall not apply the precoding weights corresponding to the received TPI bits again until the F-TPICH quality exceeds a threshold Q_tpi. When the estimated F-TPICH qualtity is better than a threshold Q_tpi, the UE shall again apply the precoding weights corresponding to the received TPI bits.

6.4A.1.2 Test case

This subclause specifies a test case, which provides additional information for how the minimum requirement should be interpreted for the purpose of conformance testing.

The quality level at the threshold Q_tpi corresponds to a signal level depending on the downlink conditions F-TPICH parameters. For the conditions in Table 6.6A, a signal with the quality below the level Q_tpi can be generated by an F-TPICH_Ec/Ior ratio of -26 dB, and a signal with the quality above the level Q_tpi can be generated by an F-TPICH_Ec/Ior ratio of -12 dB. For a UE which supports the optional enhanced requirements type1 specified based on receiver diversity for F-TPICH a signal with the quality below the level Q_tpi can be instead generated by an F-TPICH_Ec/Ior ratio of -29 dB for the conditions in Table 6.6A, and a signal with the quality above the level Q_tpi by an F-TPICH_Ec/Ior ratio of -15 dB. The downlink physical channels, other than those specified in Table 6.6A, are as specified in Table C.3 of Annex C.

Figure 6.1B shows an example scenario where the F-TPICH_Ec/Ior ratio varies from a level where the F-TPICH is demodulated under normal conditions, down to a level below Q_tpi where the UE shall apply the precoding weights corresponding to the last reliably received TPI bit pattern and then back up to a level above Q_tpi where the UE shall apply the precoding weights corresponding to the received TPI bit pattern. Figure 6.1C shows an example scenario for a UE which supports the optional enhanced requirements type1 for F-TPICH, where the F-TPICH_Ec/Ior ratio varies from a level where the F-TPICH is demodulated under normal conditions, down to a level below Q_tpi where the UE shall apply the precoding weights corresponding to the last reliably received TPI bit pattern and then back up to a level above Q_tpi where the UE shall apply the precoding weights corresponding to the received TPI bit pattern. Point B shall be at least 10 ms after point A, and point D shall be at least 10 ms after point C.

For a UE which supports the optional enhanced requirements type 1 for F-TPICH, the UE shall not be tested according to the minimum requirements.

Table 6.6A: parameters for the out-of-quality handling of F-TPICH test case

Parameter	Unit	Value
Propagation condition		Static
	dB	-1
	dBm/3.84 MHz	-60
or c I E F-TPICH _	dB	See figure 6.1B or figure 6.1C

Figure 6.1B: Test case for F-TPICH out-of-quality handling in the UE supporting the minimum requirements for F-TPICH

Figure 6.1C: Test case for F-TPICH out-of-quality handling in the UE supporting the optional enhanced requirements type1 for F-TPICH

In these test cases, the requirements for the UE are that:

1. The UE shall keep precoding weights with more than 50% of the time between point B and point C.

2. The UE apply precoding weights w.r.t. TPI bits with more than 99% of the time after point D.