CONGESTION CONTROL IN A TRANSMISSION NODE

• US 20090067335A1
• Filed: 07/04/2008
• Published: 03/12/2009
• Est. Priority Date: 07/06/2007
• Status: Abandoned Application

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Pelletier, Ghyslain, Wanstedt, Stefan, Enstrom, Daniel
• Application Number:
  US12/168,078
• Publication Number:
  US 20090067335A1
• Time in Patent Office: Days
• US Class Current: 370/238
• CPC Class Codes: H04L 41/5003 Managing SLA; Interaction between SLA and QoS
• CPC Class Codes: H04L 41/5025 by proactively reacting to service quality change, e.g. by reconfiguration after service quality degradation or upgrade
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/31 by tagging of packets, e.g. using discard eligibility [DE] bits
• CPC Class Codes: H04L 47/32 by discarding or delaying data units, e.g. packets or frames

Abstract

Packets are selectively marked or dropped when congestion of the radio resources is experienced, the selective marking/dropping being related to or dependent on the probability that a packet will be marked with the relative efficiency of usage of the radio link by the receiver, e.g., dependent upon radio resource usage costs and fairness. For example, packets are marked or dropped based on a user'"'"'s associated share of the total (or a subset of the) shared radio resources. This share may be expressed in terms of the costs of the resources in terms the user'"'"'s level of utilization of the shared resources, or in terms of it'"'"'s fairness with respect to other users sharing the same resources. Thus, the present technology takes into account the distribution of resources usage between receivers contributing to the congested state of the radio network.

Claims

1. A method of operating a communications network comprising:

detecting congestion of a shared radio resource;

for a user of the shared radio resource, selectively dropping packets allocated to the shared radio resource in accordance with the user'"'"'s share of the shared radio resources.

2. The method of claim 1, wherein the user'"'"'s share is expressed in terms of cost or amount of resources associated to a user.

3. The method of claim 2, further comprising determining the cost, or the amount of resources associated to the user, based on transmitter measurements.

4. The method of claim 3, wherein the transmitter measurements include at least one of the following:

downlink total transmit power;

downlink resource block transmit power;

downlink total transmit power per antenna branch;

downlink resource block transmit power per antenna branch;

downlink total resource block usage;

uplink total resource block usage;

downlink resource block activity;

uplink resource block activity;

uplink received resource block power;

uplink signal to interference ratio (per user equipment unit);

uplink UL HARQ block error rate.

5. The method of claim 2, further comprising determining the cost, or the amount of resources associated to the user, based on at least one of receiver feedback and/or measurements.

6. The method of claim 5, wherein the receiver feedback and/or measurements include channel quality indication/(CQI/HARQ) feedback.

7. The method of claim 1, further comprising determining the user'"'"'s share in terms of one or more of the following:

the user'"'"'s fraction of total power;

the user'"'"'s fraction of total interference;

the user'"'"'s fraction of the total number of retransmissions (where in all of the previous a higher ration means a higher cost);

channel quality indications;

handover measurements; and

, the type of modulation and coding scheme used for the user.

8. The method of claim 1, further comprising selectively dropping the packets in accordance with the user'"'"'s share of radio resource usage and relative priority of the user relative to other users in periods of congestion of the shared radio resource.

9. A node of a communications network comprising:

a transceiver configured to transmit a shared radio resource to a user;

a packet marker configured, upon detection of congestion of the shared radio resource, to selectively drop packets allocated to the shared radio resource in accordance with the user'"'"'s share of the shared radio resources.

10. The node of claim 9, wherein the user'"'"'s share is expressed in terms of cost or amount of resources associated to a user.

11. The node of claim 10, wherein the packet marker is configured to determine the cost, or the amount of resources associated to the user, based on transmitter measurements.

12. The node of claim 11, wherein the node is configured to use transmitter measurements including at least one of the following:

downlink total transmit power;

downlink resource block transmit power;

downlink total transmit power per antenna branch;

downlink resource block transmit power per antenna branch;

downlink total resource block usage;

uplink total resource block usage;

downlink resource block activity;

uplink resource block activity;

uplink received resource block power;

uplink signal to interference ratio (per user equipment unit);

uplink UL HARQ block error rate.

13. The node of claim 10, wherein the packet marker is configured to determine the cost, or the amount of resources associated to the user, based on at least one of receiver feedback and/or measurements.

14. The node of claim 13, wherein the receiver feedback and/or measurements include channel quality indication/(CQI/HARQ) feedback.

15. The node of claim 9, wherein the packet marker is configured to determine the user'"'"'s share in terms of one or more of the following:

the user'"'"'s fraction of total power;

the user'"'"'s fraction of total interference;

the user'"'"'s fraction of the total number of retransmissions (where in all of the previous a higher ration means a higher cost);

channel quality indications;

handover measurements; and

, the type of modulation and coding scheme used for the user.

16. The node of claim 9, wherein the packet marker is configured to selectively drop the packets in accordance with the user'"'"'s share of radio resource usage and relative priority of the user relative to other users in periods of congestion of the shared radio resource.