METHOD OF CONFIGURING RADIO CONNECTION IN MULTIPLE CELL SYSTEM

• US 20110300872A1
• Filed: 03/11/2010
• Published: 12/08/2011
• Est. Priority Date: 03/11/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lim, Su Hwan, Kim, Bong Hoe, Lee, Sang Wook, Jung, In Jae, Seo, In Kwon
• Granted Patent: US 8,600,395 B2
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0077 Cooperative coding
• CPC Class Codes: H04L 1/0606 Space-frequency coding
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04W 36/00695 using split of the control plane or user plane
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: H04W 76/34 Selective release of ongoing connections

Abstract

A method of configuring a radio connection in a multiple cell system is provided. The method includes configuring a first radio connection between a user equipment (UE) and a primary base station (BS) and a second radio connection between the UE and a secondary BS based on a cooperative transmission configuration in which a plurality of BSs transmit the same data to the UE, receiving first channel state regarding the first radio connection and second channel state regarding the second radio connection from the UE, releasing at least one radio connection of the first radio connection and the second radio connection, the at least one radio connection having a worse channel state than a threshold, transmitting to the UE, a new cooperative transmission configuration changed by the release of the at least one radio connection, and receiving a layer reconfiguration complete message indicating completion of layer reconfiguration based on the new cooperative transmission configuration.

Claims

1. A method of configuring a radio connection in a multiple cell system, the method comprising:

configuring a first radio connection between a user equipment (UE) and a primary base station (BS) and a second radio connection between the UE and a secondary BS based on a cooperative transmission configuration in which a plurality of BSs transmit the same data to the UE;

receiving first channel state regarding the first radio connection and second channel state regarding the second radio connection from the UE;

releasing at least one radio connection of the first radio connection and the second radio connection, the at least one radio connection having a worse channel state than a threshold;

transmitting to the UE, a new cooperative transmission configuration changed by the release of the at least one radio connection; and

receiving a layer reconfiguration complete message indicating completion of layer reconfiguration based on the new cooperative transmission configuration.

2. The method of claim 1, further comprising, before the at least one radio connection is released, comparing the first channel measurement information and the second channel measurement information with the threshold.

3. The method of claim 1, wherein a physical downlink control channel (PDCCH) is transmitted to the UE through the first radio connection.

4. The method of claim 3, further comprising, if the released at least one radio connection is the first radio connection, releasing the second radio connection even if the second channel state is better than the threshold.

5. The method of claim 4, further comprising reconfiguring a radio connection with the UE.

6. The method of claim 3, wherein, if the released at least one radio connection is the second radio connection, communication with the UE is performed using the first radio connection.

7. The method of claim 1, wherein a PDCCH is transmitted to the UE through the first and second radio connections.

8. The method of claim 7, wherein the new cooperative transmission configuration is transmitted through a physical downlink shared channel (PDSCH) based on a radio connection remaining, if ever, after the releasing process.

9. The method of claim 1, wherein the threshold is 10% of a block error rate (BLER) of a PDCCH.

10. The method of claim 1, wherein the cooperative transmission configuration comprises the number of transmit antennas, a precoding matrix, a modulation and coding scheme (MCS), and a rank.