Uplink license-free (non-dynamic scheduling) refers gNB time by activating the uplink grant to the UE, the UE is not received in the case of deactivation, will uplink grant has been used for the first time designated resources for uplink transmission, which has two transmission type:
- Authorization configuration type 1: configure (IE ConfiguredGrantConfig) made by the RRC layer signaling;
- Authorization configuration type 2: Free uplink grant instructing activation and deactivation of DCI, which parameters need be configured by IE ConfiguredGrantConfig, but only needs to be activated by the use of the DCI.
Configuring authorization type 1 and type 2 distinguished by a field in the IE ConfiguredGrantConfig rrc-ConfiguredUplinkGrant, if the field configuration, for the authorization type 1 configuration, if the field is not arranged, for the authorization type 2 configuration, which describes the configuration IE ConfiguredGrantConfig 17.1 shown in FIG.
FIG ConfiguredGrantConfig configuration diagram 17.1 IE
As it can be seen in Figure 17.1, if the uplink unlicensed type 1 to type configuration, in the rrc-ConfiguredUplinkGrant type 1 parameters are all necessary parameters, comprising: a time domain resource, frequency resource, modulation and coding scheme (the IMCS) , antenna port, the SRS resource indication, a demodulation reference signal (DM-RS) and other related parameters. In addition, IE ConfiguredGrantConfig also includes type 1 and type 2 common parameters required, such as: period (periodicity), HARQ process number (nrofHARQ-Processes), power control, the number of repetitions (repK), repeated redundancy versions all parameters required when (repK-RV), etc. uplink transmission.
Meanwhile, type 2, it can be seen that, in addition to type 1 and type 2 common parameters required, which is not time domain resource configuration, frequency domain resource, modulation and coding scheme (the IMCS) and other related parameters, the UE where to get these parameters? From the above, the configuration grants of uplink transmissions activated by the DCI, so for type 2, after the UE receives the type 1 and type 2 common parameters required rrc-ConfiguredUplinkGrant configured, not immediately type 2, only when the UE receives a CS-RNTI DCI scrambled activation indication, and will carry the time domain resource, frequency resource, modulation and coding scheme (the IMCS) and other related parameters, UE will perform uplink transmission type 2 unlicensed.
If there is no high-rise on the uplink resources allocated unlicensed transmission TB, the UE does not send anything on the resource GrantConfig configuration configuration.
For both types of authorization configuration, which configuration parameters with a common "periodicity", so two configuration types Once activated, the UE may transmit uplink data on a periodic PUSCH:
For authorization configuration type 1, which period shown in the formula:
[(SFN × numberOfSlotsPerFrame × numberOfSymbolsPerSlot) + (slot number in the frame ×
numberOfSymbolsPerSlot) + symbol number in the slot] =
(timeDomainOffset × numberOfSymbolsPerSlot + S + N × periodicity) modulo (1024 × numberOfSlotsPerFrame ×
numberOfSymbolsPerSlot), for all N >= 0.
For configuration authorization type 2, which cycle formula is as follows:
[(SFN × numberOfSlotsPerFrame × numberOfSymbolsPerSlot) + (slot number in the frame ×
numberOfSymbolsPerSlot) + symbol number in the slot] =
[(SFNstart time × numberOfSlotsPerFrame × numberOfSymbolsPerSlot + slotstart time × numberOfSymbolsPerSlot + symbolstart time) + N × periodicity] modulo (1024 × numberOfSlotsPerFrame × numberOfSymbolsPerSlot), for all N >= 0.
Wherein SFNstart time, slotstart time, symbolstart time represent the first PUSCH transmission timing (uplink grant when configured to initialize or reinitialize) system frame number, slot, symbol.
As it can be seen from Figure 17.1, the upstream unlicensed uplink data transmission period of a minimum of two symbols. 15KHz subcarrier spacing is assumed, then 1 slot = 14 symbol, if the uplink period is configured to unlicensed 2 symbol, then the UE may perform uplink transmission 7 in 1 slot, if the period is configured to 14 symbol, the UE will each the uplink slot for uplink transmission are. Once the configuration unlicensed uplink period is activated, will always UE performs uplink transmission (unless deactivated) without having to determine dynamically allocated uplink resource, each instruction requires DCI, which saves the UE transmits the SR periodic points, BSR and gNB for air interface transmission time of an uplink resource indicated by the DCI, and therefore more suitable for uplink unlicensed low latency scene.
Repeated transmission reliability of the transmission can be improved, it can bring gains in eMTC and NB-IoT duplicate form has been adopted, in order to bring the gain. In an uplink transmission also supported the unlicensed repeated transmission, the number of its repeated transmissions by IEs ConfiguredGrantConfig in type 1 and type 2 common parameters repK configuration. IEs ConfiguredGrantConfig parameters repK and repK-RV define the transmission of TB K repetitions, and the applied redundancy version repeating pattern. If ConfiguredGrantConfig not repK configuration parameters in the configuration having the redundancy version authorized uplink transmission should be set to 0. Otherwise, n k times lower than the repeated transmission (n = 1,2, ..., K ) RV sequence timing transmissions, RV and disposed in its associated (mod (n-1,4) +1) th associated value.
Since the parameter repK-RV can indicate three kinds of RV mode, the transmission is repeated TB of initial transmission RV possible starting at:
- If the RV sequence {0,2,3,1} is configured, the initial transmission of TB RV starting from K repetitions first transmission opportunity;
- If the RV sequence {0,3,0,3} is configured, the initial transmission of TB RV may start at any one of K repetitions associated with a transmission opportunity RV = 0;
- If the RV sequence {0,0,0,0} is configured, if K = 8, the initial transmission of TB RV may start at any other transmission opportunity is repeated K times within a transmission opportunity of the last addition; if K = 2,4, then the initial transmission of TB RV may start at any K repetitions transmission opportunity.
Another symbol of the PUSCH for any RV sequence, the transmission should be repeated repeat after termination K, or a transmission time between the last repetition period P in the K, with the same HARQ process in the DCI format 0_0 0_1 scheduled or termination, three, whichever comes first. Repeated K times the duration of transmission is not configured for the UE is configured of a duration greater than the period P.
For a configuration authorization type 1 type 2 PUSCH transmission and, when the UE configuration parameters repK> when 1, UE should repeatedly transmit the same the TB K times at K transmission opportunity, wherein K transmission opportunity located time-consecutive K within a period gap. If the UE is configured for determining PUSCH transmission symbol is a downlink symbol, the UE cancels the PUSCH transmission in a time slot on a certain time slot.
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