1. Further Considerations to MS-MS Power Control
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IEEE C802.16n-11/0151
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Eldad Zeira Voice:
InterDigital
Anh Tuan Hoang, Haiguang Wang
I2R
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IEEE n at session #75 responding to call for comments for AWD n-11/0015
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2. Further Considerations for MS-MS Power Control Eldad Zeira, Anh Tuan Hoang, Haiguang Wang InterDigital & I2R

3. Goals for MS-MS power control
Optimize link performance and cell interference
Re-use baseline power control procedures
Minimize MS computational complexity
Allow BS control for MS-MS power control

4. Power control procedures: 802.16m
For data channels (incl. MAC messages)
SINRTarget is the target UL SINR needed at receiving MS
P is the TX power level (dBm) per stream and per subcarrier for the current transmission
L is the estimated average current DL propagation loss
NI is the estimated N+I at receiving MS.
Offset is a correction term.
SINRMIN(dB) is for minimum rate expected by ABS.
γIoT is the fairness and IoT control factor broadcasted.
SIRDL is the linear ratio of the downlink signal to interference power.
α depends on the number of receive antennas at receiving MS.
β is set to one to account for number of streams.
TNS is the total number of streams

5. Power control procedures: 2009 ([2] 8.4.10.3)
Closed loop PC
Open loop PC (optional)

6. Ingredients of power control in 802.16
802.16m
“Open” loop
“Closed” loop
N/A
Path loss measurement
On preamble
“Offset” loop closure
MAC message
Interference control
Implied, using “Offset”
In combination with MS-derived value

7. Path loss measurement
A suitable signal must be transmitted by the receiver of the data
Note that all power control procedures use average path loss
HR-MS specific preamble could be used for the purpose
For the case where we use group preambles (for HR-MS discovery) we could:
Prevent HR-MS that already have an active link or links from being discovered in group mode, OR
TDM group specific and HR-MS specific preambles in different sub-frames
Preamble transmit level is made known to the transmitter of the data
The transmitter of the data calculates path loss

8. Handling of “Offset” and other parameters
Offset is best generated by the receiver of the data
Offset should be indirectly controlled or constrained by the BS (e.g. w min and max placed on value or on delta)
Other parameters are generated by the HR-BS and broadcast or unicast [TBD] to associated HR-MS.
Forwarding HR-MS forward these parameters to un-associated HR-MS with which they have a communications channel.

9. Handling of Interference by MS (16m based)
The added term adjusts power level to achieve an optimum between owl link performance and interference to other MS-MS links.
The optimal point is controlled by the BS in the same manner as for inter-cell interference in 16m.

10. Text proposal - 1
Add at the bottom of section of AWD 80216n-11_0015.pdf: The HR-BS signals power control parameters to all HR-MS with active links. HR-MS may be instructed by the HR-BS to estimate path loss between HR-MSs. The receiver of data generate offset controls that are based on constraints or parameters, signaled from HR-BS Cross link interference is handled by augmenting the PC to include SIR measured on crosslink resources The same procedure is applied for BS-controlled FTN and BS-controlled direct communication.

11. Text proposal 1 – cont’d
For power control, HR-MS shall use a modified eqn. 292:
Add the following descriptors
is a fairness parameters for interference to other MS-MS transmissions , and
is the linear ratio of the signal to interference power as received by the power controlled MS, measured on resources used for MS-MS links as determined by the BS.

12. Text proposal - 2
Add at the bottom of section of AWD 80216n-11_0015.pdf: The HR-BS signals power control parameters to all HR-MS with active links. HR-MS may be instructed by the HR-BS to estimate path loss between HR-MSs. The receiver of data generate offset controls that are based on constraints or parameters, signaled from HR-BS The same procedure is applied for BS-controlled FTN and BS-controlled direct communication.

13. References
[1] m amendment (D12)
[2] “2009”
[3] UL open loop PC recommendations IEEE s802.16m-09/0546