Uplink congestion control

Patent metadata

Field	Value
Publication number	US-9717057-B2
Application number	US-201114356107-A
Country	US
Kind code	B2
Filing date	Nov 21, 2011
Priority date	Nov 4, 2011
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

The present disclosure relates to an uplink congestion control scheme. In one embodiment, an uplink congestion control method is provided, comprising steps of: determining whether or not a congestion status of a serving cell is changed based on a rise over thermal, RoT, measurement; sending to a set of user equipment, UEs, a signaling to indicate the change of the congestion status; and performing an uplink congestion control based on the RoT measurement and with enhanced transmission format combination, E-TFC, reselection by at least one UE from the set of UEs based at least on the signaling.

First claim

What is claimed is:

1. An uplink congestion control method, comprising steps of:
determining, by a base station, that a congestion status of a serving cell is changed based on a rise over thermal (RoT) measurement, wherein the determining includes comparing the RoT measurement to a threshold value based on cell coverage of the serving cell, and wherein the RoT measurement is performed every radio frame or every multiple of radio frames to provide a first power control and a Signal to Interference Ratio is measured for every time slot to provide a second power control;
sending, by the base station, to a set of user equipment (UEs) a signaling to indicate the change of the congestion status and a UE transmission power reduction level, wherein the set of UEs are selected from a plurality of UEs based on the set of UEs being enhanced transmission format combination (E-TFC) reselection enabled; and
performing an uplink congestion control based on the RoT measurement and E-TFC reselection by at least one UE from the set of UEs, wherein the E-TFC reselection is based at least on the indicated change of the congestion status and the UE transmission power reduction level.

2. The uplink congestion control method according to claim 1 , wherein the signaling indicates “congested” if the serving cell enters congestion while not in congestion at the time the last RoT measurement was received.

3. The uplink congestion control method according to claim 1 , wherein the signaling indicates “not congested” if the serving cell leaves congestion while in congestion at the time the last RoT measurement was received.

4. The uplink congestion control method according to claim 1 , wherein the UE transmission power reduction level is determined based on a difference, DeltaRoT, between the measured RoT, RoT measure , and a configurable congestion detection threshold, RoT congestion _ threshold , such that:
DeltaRoT=RoT measure −RoT congestion _ threshold .

5. The uplink congestion control method according to claim 4 , wherein the UE transmission power reduction level, P reduce , is determined according to
P reduce =min(max(0 ,m ), delta max ), if( m− 1)·ROT grid ≦DeltaROT≦ m ·ROT grid ,

where
m is a non-zero integer;
ROT grid is a predefined parameter giving a quantification precision; and
delta max is an upper limit of the UE transmission power reduction level.

6. The uplink congestion control method according to claim 1 , wherein
a UE transmission power reduction level is predefined; and
the E-TFC reselection by the at least one UE is further based on the predefined UE transmission power reduction level.

7. The uplink congestion control method according to claim 1 , wherein the E-TFC reselection by the at least one UE is that the at least one UE selects a E-TFC lower than that given by a scheduling grant and a maximum transmission power for the at least one UE.

8. A base station, comprising:
a congestion status determining unit configured to determine whether or not a congestion status of a serving cell of the base station is changed based on a rise over thermal (RoT) measurement, wherein the determining includes comparing the RoT measurement to a threshold value based on cell coverage of the serving cell, wherein the RoT measurement is performed every radio frame or every multiple of radio frames to provide a first power control and a Signal to Interference Ratio is measured for every time slot to provide a second power control;
transmitter configured to send to a set of user equipment (UEs) a signaling to indicate the change of the congestion status determined by the congestion status determining unit and a UE transmission power reduction level, wherein the set of UEs are selected from a plurality of UEs based on the set of UEs being enhanced transmission format combination (E-TFC) reselection enabled; and
an uplink congestion control unit configured to perform an uplink congestion control based on the RoT measurement and E-TFC reselection by at least one UE from the set of UEs, wherein the E-TFC reselection is based at least on the indicated change of the congestion status and the UE transmission power reduction level sent by the transmitter.

9. The base station according to claim 8 , wherein the signaling indicates “congested” if the serving cell enters congestion while not in congestion at the time the last RoT measurement was received.

10. The base station according to claim 8 , wherein the signaling indicates “not congested” if the serving cell leaves congestion while in congestion at the time the last RoT measurement was received.

11. The base station according to claim 8 , wherein the UE transmission power reduction level determining unit is further configured to determine the UE transmission power reduction level based on a difference, DeltaRoT, between the measured RoT, RoT measure , and a configurable congestion detection threshold, RoT congestion _ threshold , such that:
DeltaRoT=RoT measure −RoT congestion _ threshold .

12. The base station according to claim 11 , wherein the UE transmission power reduction level determining unit is further configured to determine the UE transmission power reduction level, P reduce , according to
P reduce =min(max(0 ,m ), delta max ), if( m− 1)·ROT grid ≦DeltaROT≦ m ·ROT grid ,

where
m is a non-zero integer;
RoT grid is a predefined parameter giving a quantification precision; and
delta max is an upper limit of the UE transmission power reduction level.

13. The base station according to claim 8 , further comprising:
a UE set forming unit configured to form the set of UEs according to capabilities of UEs in the serving cell.

14. A non-transitory computer-readable storage medium storing instructions for performing uplink congestion control, when executed by a computing device, the instructions causing the computing device to:
determine that a congestion status of a serving cell is changed based on a rise over thermal (RoT) measurement, wherein the determination includes comparing the RoT measurement to a threshold value based on cell coverage of the serving cell, and wherein the RoT measurement is performed every radio frame or every multiple of radio frames to provide a first power control and a Signal to Interference Ratio is measured for every time slot to provide a second power control;
send to a set of user equipment (UEs) a signaling to indicate the change of the congestion status and a UE transmission power reduction level, wherein the set of UEs are selected from a plurality of UEs based on the set of UEs being enhanced transmission format combination (E-TFC) reselection enabled; and
perform an uplink congestion control based on the RoT measurement and E-TFC reselection by at least one UE from the set of UEs, wherein the E-TFC reselection is based at least on the indicated change of the congestion status and the UE transmission power reduction level.

15. The non-transitory computer-readable storage medium according to claim 14 , wherein the signaling indicates “congested” if the serving cell enters congestion while not in congestion at the time the last RoT measurement was received.

16. The non-transitory computer-readable storage medium according to claim 14 , wherein the signaling indicates “not congested” if the serving cell leaves congestion while in congestion at the time the last RoT measurement was received.

17. The non-transitory computer-readable storage medium according to claim 14 , wherein the UE transmission power reduction level is determined based on a di

Assignees

• Zhang Zhang
• Gu Xinyu
• Wigren Torbjörn
• ERICSSON TELEFON AB L M (publ)

Inventors

• Zhang Zhang
• Gu Xinyu
• Wigren Torbjörn

Classifications

• H04W52/343

  taking into account loading or congestion level · CPC title

• H04W52/146

  Uplink power control · CPC title

• H04W28/0289

  Congestion control (load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12) · CPC title

• H04W28/0284

  detecting congestion or overload during communication (monitoring arrangements H04L43/00) · CPC title

• H04W52/241 Primary

  taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo · CPC title