METHOD FOR TRANSITION BETWEEN DISTRIBUTED TRANSMISSION AND LOCALIZED TRANSMISSION

• US 20090130985A1
• Filed: 01/08/2007
• Published: 05/21/2009
• Est. Priority Date: 01/06/2006
• Status: Active Grant

• Current Assignee: Beijing Samsung Telecom R&D Center (Samsung Electronics Co. Ltd.), Samsung Electronics Co. Ltd.
• Original Assignee: Beijing Samsung Telecom R&D Center (Samsung Electronics Co. Ltd.), Samsung Electronics Co. Ltd.
• Inventors: Li, Xiaoqiang, Lee, Ju-Ho, Zhang, Yujian, Sun, Chunying, Sun, Chengjun
• Granted Patent: US 8,208,855 B2
• Time in Patent Office: Days
• US Class Current: 455/67.110
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 5/0044 allocation of payload

Abstract

Provided is a method for transitioning between a distributed transmission mode and a localized transmission mode, including transmitting, by a Base Station (BS), a measurement control message to a User Element (UE), wherein the UE makes corresponding measurement and transmits a required measurement report message to the BS and the BS transmits a transition indicator message of new mode to the UE based on measurement report message sent from the UE; and commencing CQI reporting and a downlink transmission of a new mode between the UE and the BS. The BS can choose a more appropriate transmission mode for the downlink transmission based on changing characteristics of the channel in the time domain and the frequency domain.

Claims

1. A method of transition between distributed transmission mode and localized transmission mode includes:

a) transmitting, by a Base Station (BS), a measurement control message to a User Equipment (UE);

b) performing by the UE, a corresponding measurement and transmits a required measurement report message to the BS;

c) transmitting, by the BS, a transition indicator message of a new mode to the UE based on the measurement report message sent from the UE;

d) performing Channel Quality Indicator (CQI) reporting and a downlink transmission of the new mode between the UE and the BS begins.

2. The method according to claim 1, wherein the new mode contains a distributed transmission mode and a localized transmission mode.

3. The method according to claim 2, wherein the distributed transmission mode reports a single CQI of the whole frequency band to the BS for the UE.

4. The method according to claim 2, wherein the localized transmission mode reports several CQIs of several sub-frequency bands to the BS for the UE.

8. The method according to claim 1, wherein the measurement control message contains a report condition to be measured by the UE.

9. The method according to claim 1, wherein said measurement control message in step a) contains threshold indicated by the BS to the UE.

10. The method according to claim 1, wherein said measurement control message in step a) contains period of measurement report indicated by the BS to the UE.

11. The method according to claim 1, wherein said measurement report sent from the UE in step b) contains measurement report that reflects downlink channel fading selectivity in frequency domain.

12. The method according to claim 1, wherein said measurement report sent from the UE in step b) is event type.

13. The method according to claim 12, wherein said event reflects comparison result of measured value measured by the UE and threshold indicated by the BS.

5. (canceled)

6. (canceled)

7. (canceled)