BASE STATION AND COMMUNICATION CONTROL METHOD

• US 20110038264A1
• Filed: 03/16/2009
• Published: 02/17/2011
• Est. Priority Date: 03/19/2008
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Ishii, Hiroyuki
• Granted Patent: US 8,477,628 B2
• Time in Patent Office: Days
• US Class Current: 370/238
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/11 Identifying congestion
• CPC Class Codes: H04L 47/2433 Allocation of priorities to traffic types
• CPC Class Codes: H04L 47/29 using a combination of thresholds
• CPC Class Codes: H04L 47/30 in combination with information about buffer occupancy at either end or at transit nodes
• CPC Class Codes: H04W 28/0252 per individual bearer or channel dynamic wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 28/0278 using buffer status reports dynamic wireless traffic scheduling definition H04W72/12
• CPC Class Codes: H04W 28/0284 detecting congestion or overload during communication monitoring arrangements H04L43/00
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A base station communicating with user equipments using shared channels. The base station includes a congestion level estimation unit estimating a congestion level of a cell; a priority-level/desired-value changing unit changing priority levels or desired minimum transmission rates of data to be transmitted by the user equipments or the base station based on the congestion level of the cell; and a selection unit selecting one or more of the user equipments to which radio resources are to be allocated based on the changed priority levels or the changed desired minimum transmission rates of the data.

Claims

1. A base station communicating with user equipments using shared channels, the base station comprising:

a congestion level estimation unit estimating a congestion level of a cell;

a priority-level/desired-value changing unit changing priority levels or desired minimum transmission rates of data to be transmitted by the user equipments or the base station based on the congestion level of the cell; and

a selection unit selecting one or more of the user equipments to which radio resources are to be allocated based on the changed priority levels or the changed desired minimum transmission rates of the data.

2. The base station as claimed in claim 1, wherein the selection unit selects one or more of the user equipments to which downlink radio resources are to be allocated based also on at least one of channel quality information reported by the user equipments and average transmission rates of the user equipments.

3. The base station as claimed in claim 1, wherein the selection unit selects one or more of the user equipments to which uplink radio resources are to be allocated based also on at least one of radio quality of reference signals transmitted from the user equipments and average transmission rates of the user equipments.

4. The base station as claimed in claim 1, wherein the congestion level estimation unit estimates the congestion level of the cell based on at least one of

a number of the user equipments or a number of logical channels of the user equipments for which data to be transmitted are present in downlink transmission buffers;

a number of the user equipments or a number of logical channels of the user equipments for which data to be transmitted are present in uplink transmission buffers;

a number of the user equipments communicating frequently using the shared channels;

a number of the user equipments communicating infrequently using the shared channels;

a number of the user equipments in a connected state in the cell;

a number of the user equipments or a number of logical channels of the user equipments whose downlink transmission rates are less than a predetermined threshold;

a number of the user equipments or a number of logical channels of the user equipments whose uplink transmission rates are less than a predetermined threshold;

a number of the user equipments or a number of logical channels of the user equipments whose buffering time of downlink data is greater than a predetermined threshold;

a number of the user equipments or a number of logical channels of the user equipments whose buffering time of uplink data is greater than a predetermined threshold;

a number of the user equipments or a number of logical channels of the user equipments whose downlink data have been discarded due to delay;

a number of the user equipments or a number of logical channels of the user equipments whose uplink data have been discarded due to delay;

a processing load of the base station; and

a processing load of another node.

5. The base station as claimed in claim 4, wherein the transmission rates are calculated in a period of time during which data to be transmitted are present in a transmission buffer.

6. A communication control method performed by a base station communicating with user equipments using shared channels, the method comprising the steps of:

estimating a congestion level of a cell;

changing priority levels or desired minimum transmission rates of data to be transmitted by the user equipments or the base station based on the congestion level of the cell; and

selecting one or more of the user equipments to which radio resources are to be allocated based on the changed priority levels or the changed desired minimum transmission rates of the data.