Methods of determining uplink target signal-to-interfence-and-noise ratios and systems thereof
View Patent ↗Example embodiments are directed to a method of determining an uplink target signal-to-interference-and-noise ratio (SINR). In one embodiment, the method includes determining the uplink target SINR for a user equipment (UE) based on a downlink signal-to-interference ratio (SIR). The downlink SIR is determined based on a channel quality indication (CQI) index received from the user equipment.
1. A method of uplink power control, the method comprising:
determining an uplink target signal-to-interference-and-noise ratio (SINR) for a user equipment (UE) based on a downlink signal-to-interference ratio (SIR), the downlink SIR being determined based on a channel quality indication (CQI) index received from the user equipment.
2. The method of claim 1 , further comprising:
determining a power spectral density offset based on the determined uplink target SINR.
3. The method of claim 2 , further comprising:
transmitting the power spectral density offset to the UE.
4. The method of claim 3 , further comprising:
determining a modulation and coding scheme based on the transmitting.
5. The method of claim 3 , wherein the transmitting includes,
transmitting the power spectral density offset periodically.
6. The method of claim 1 , wherein the determining the uplink target SINR determines the uplink target SINR as follows:
Uplink_Target_SINR=R φ I
where φ I is the downlink SIR and R is a constant.
7. The method of claim 6 , wherein the determining includes determining the downlink SIR as follows:
φ
I
=
g
s
,
m
∑
i
g
i
,
m
-
g
s
,
m
where g i,m is a path gain from the UE to a neighboring cell site i and g s,m is a path gain from the UE to a serving cell site s.
8. The method of claim 1 , wherein the determining includes determining a modulation and coding scheme based on the downlink SIR.
9. The method of claim 1 , wherein the determining the uplink target SINR includes,
determining a downlink SINR based on the CQI index.
10. The method of claim 9 , wherein the determining the uplink target SINR includes,
determining the downlink SIR based on the downlink SINR.
11. The method of claim 1 , wherein the determining the uplink target SINR determines the uplink target SINR in dB as follows:
Γ=Γ 1 +(1−β)(Γ D +Γ 0 )
where Γ D is the downlink SIR, Γ 0 is a constant for calibration and Γ 1 is the target SINR for β=1 and β is a constant.
12. A system comprising:
a cell site configured to determine an uplink target signal-to-interference-and-noise ratio (SINR) for a user equipment (UE) based on a downlink signal-to-interference ratio (SIR), the downlink SIR being determined based on a channel quality indication (CQI) index received from the user equipment.
13. The system of claim 12 , wherein the cell site is configured to determine a power spectral density offset based on the determined uplink target SINR.
14. The system of claim 13 , wherein the cell site is configured to transmit the power spectral density offset to the UE.
15. The system of claim 13 , wherein the cell site is configured to determine a modulation and coding scheme based on the power spectral density offset.
16. The system of claim 15 , wherein the cell site is configured to transmit the power spectral density offset periodically.
17. The system of claim 12 , wherein the cell site is configured to determine the uplink target SINR as follows:
Uplink_Target_SINR=R φ I
where φ I is the downlink SIR and R is a constant.
18. The system of claim 12 , wherein the cell site is configured to determine the uplink target SINR in dB as follows:
Γ=Γ 1 +(1−β)(Γ D +Γ 0 )
where Γ D is the downlink SIR, Γ 0 is a constant for calibration and Γ 1 is the target SINR for β=1 and β is a constant.