Uplink link adaptation in 5G base stations
A method for providing uplink link adaptation in 5G base stations is presented. In one embodiment the method includes computing a RSSI of each allocation measuredRSSI(i), including blocks which are unused; computing measurements upon receiving channel allocation and TPC commands from a MAC, the measurements including a revisedWidebandRSSI including a revisedRSSI(i), a lowest relative threshold of each allocation, and a revised RSSI of each allocation after applying TPC commands normalized by the revisedWidebandRSSI; when the revisedWidebandRSSI is greater than a widebandRSSIthreshold, then resetting the TPC commands to be sent to the particular UE and sending a saturation_error_indication message to the MAC; wherein when a revisedRSSInorm(i) for at least one allocation is below the widebandRSSIthreshold, sending the quant_loss_error_indication message to the MAC along with the corresponding index of the allocation; and adapting the MCS and power control information for each of the allocations in the next subframe.
1. A method for providing uplink link adaptation in 5G base stations, comprising:
computing, by a Physical Layer (PHY), a Received Signal Strength Indicator (RSSI) of each allocation including blocks which are unused;
computing measurements upon receiving channel allocation and Transmission Power Control (TPC) commands from a Media Access Control (MAC), the measurements including a first factor including a second factor, a third factor and a fourth factor;
wherein when the fourth factor is greater than a first threshold, then resetting, by the PHY, the TPC commands to be sent to the particular UE and sends a first error message to the MAC;
wherein when the second factor for at least one allocation is below the threshold, sending, by the PHY, a second error message to the MAC along with the corresponding index of the allocation; and
upon receiving of the indications from the PHY, adapting, by the MAC, the MCS and power control information for each of the allocations in the next subframe.
2. The method of claim 1 wherein the first factor comprises a revisedWidebandRSSI, wherein the second factor comprises a revisedRSSI(i), wherein the third factor comprises a lowest relative threshold of each allocation, and wherein the fourth factor comprises a revised RSSI of each allocation after applying the TPC commands normalized by the first factor.
3. The method of claim 2 wherein the threshold comprises a widebandRSSIthreshold.
4. The method of claim 3 wherein the first error message comprises a saturation_error_indication message to the MAC, and wherein the second error message comprises a quant_loss_error_indication message.
5. The method of claim 2 wherein computing the revisedWidebandRSSI comprises:
revisedWidebandRSSI
=
∑
i
=
1
n
revisedRSSI
(
i
)
revisedRSSI
(
i
)
=
measuredRSSI
(
i
)
+
powerDiff
(
i
)
where n is the total number of blocks including the unused blocks, and powerDiff is a function of the TPC commands given by the MAC for a given allocation.
6. The method of claim 2 wherein a Revised RSSI of each allocation after applying the TPC commands normalized by revisedWidebandRSSI comprises:
revisedRSSInorm
(
i
)
=
revisedRSSI
(
i
)
revisedWidebandRSSI
7. The method of claim 5 wherein
widebandRSSIthreshold= a* 2 2(q-1)
where, α is a scale factor between 0.8 to 1
q is the ADC bit width.