PUCCH HARQ-ACK resource calculation is divided into two parts.

Use pucch-ResourceCommon and PUCCH-Config configurations.

1. pucch-ResourceCommon

When the UE has not obtained when dedicated pucch resource configuration, i.e. pucch-resource-set time in pucch-config, use resources pucch-ResourceCommon be configured HARQ-ACK feedback.

For example, when the initial random access the UE, pucch-config in rrcConnectionSetup configuration, after the random access is successful, it is necessary for the successful contention resolution corresponding to the PDSCH MSG4 HARQ-ACK feedback.

Or rrcConnectionSetup not arranged in the initial BWP pucch-config.

 

By "Cond InitialBWP-Only" Comments "The field is mandatory present in the PUCCH-ConfigCommon of the initial BWP (BWP#0) in SIB1. It is absent in other BWPs."It can be seen only in the presence of Initial BWP, the other BWP not arranged pucch-ResourceCommon.

Then the non intial BWP, you must configure pucch-Config.

PUCCH is a configuration table, by pucch-ResourceCommon Index as a first column, a row indicates the use of them.

 

pucch-ResourceCommon seen, only PUCCH format 0 and PUCCH format 1, then the number of bits of the HARQ-ACK also limited.

Protocol pdsch-HARQ-ACK-Codebook feedback UE to limit the number of bits, in which case the number of bits is 1 bit.

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If a UE is not provided pdsch-HARQ-ACK-Codebook, the UE generates at most oneHARQ-ACK information bit. 

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Wherein a scene is still on the initial random access time MSG4 PDSCH HARQ-ACK feedback in this case no UE pdsch-HARQ-ACK-Codebook.

Another scenario scene reconstruction, at which time all dedicated parameters are set to default parameters, pdsch-HARQ-ACK-Codebook is also the configuration is not the default configuration.

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apply the default L1 parameter values as specified in corresponding physical layerspecifications except for the parameters for which values are provided in SIB1

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Use pucch-ResourceCommon resources, stationary use frequency hopping.

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The UE transmits a PUCCH using frequency hopping.

An orthogonal cover code with index 0 is used for a PUCCH resource with PUCCHformat 1 in Table 9.2.1-1.

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PUCCH format 0 and 1, PUCCH format parameters may be obtained from the basic table, and the frequency domain position of a last Set of initial CS indexes index is calculated as follows.

2. PUCCH-Config

The basic configuration is as follows PUCCH-Config, configures a resourceSetList, each resourceSet contains a plurality of resource.

 

 

First, the number of X is determined by a bit select resourceSet.

 

Only the number of bits for HARQ-ACK feedback time, reference may be first LearningTypeI - Semi-static HARQ-ACK bits determined，Type II – NR DynamicHARQ Feedback。

 

See chatter in which bit interval, selecting the resourceSet.

X=1,2                -----  resourceSet#0

2<X<=N2         ----   resourceSet#1

N2<X<=N3      ----   resourceSet#2

N3<X<=1706   ----   resourceSet#3

Wherein the N2, N3 is the configuration maxPayloadSize, if the value of 1706 is not configured.

 

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maxPayloadSize

Maximum number of UCI information bits that the UE may transmit using this PUCCHresource set (see TS 38.213 [13], clause 9.2.1). In a PUCCH occurrence, the UE choosesthe first of its PUCCH-ResourceSet which supports the number of bits that the UE wantsto transmit. The field is absent in the first set (Set0) and in the last configured set sincethe UE derives the maximum number of UCI information bits as specified in TS 38.213[13], clause 9.2.1. This field can take integer values that are multiples of 4.

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Then, in the DCI pucch resource indicator to determine choose which items in the collection.

 

For Set # 0, some special, the maximum resource 32 may be configured, when the number of resource configurations is greater than 8 which, at this time since the PUCCH resource indicator only three bits, not directly as an index to select resources.