METHOD OF PERFORMING FEEDBACK FOR MULTICAST AND BROADCAST SERVICE

• US 20100323737A1
• Filed: 12/17/2008
• Published: 12/23/2010
• Est. Priority Date: 12/18/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ko, Hyun Soo, Ihm, Bin Chul, Koo, Ja Ho, Kim, Su Nam
• Granted Patent: US 8,417,273 B2
• Time in Patent Office: Days
• US Class Current: 455/509
• 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 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/3488 Multiresolution systems
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code

Abstract

A method of performing a feedback for a multicast and broadcast service (MBS) is disclosed. A Multicast Broadcast Service (MBS) feedback method includes, generating, by a base station contained in a multi-cell multicast broadcast single frequency network (MBSFN) zone, a ranging channel code for a multicast broadcast service (MBS) feedback, allocating the ranging channel code to a mobile station contained in a cell zone of the base station, and receiving the MBS feedback information based on the ranging channel code from the mobile station. So, an adaptive modulation and coding (AMC) is applied to the MBS according to the NACK feedback, such that a throughput of the MBS system increases.

Claims

1. A Multicast Broadcast Service (MBS) feedback method comprising:

generating, by a base station contained in a multi-cell multicast broadcast single frequency network (MBSFN) zone, a ranging channel code for a multicast broadcast service (MBS) feedback;

allocating the ranging channel code to a mobile station contained in a cell zone of the base station; and

receiving the MBS feedback information using the ranging channel code from the mobile station.

2. The MBS feedback method according to claim 1, further comprising:

adjusting a Modulation and Coding Scheme (MCS) level according to the MBS feedback information.

3. The MBS feedback method according to claim 2, further comprising:

if the base station has a channel environment better than that of another base station contained in the MBSFN zone,

further increasing the MCS level of the base station using a hierarchical modulation (HM) scheme.

4. The MBS feedback method according to claim 1, further comprising:

periodically transmitting information of a frame, to which the ranging channel code is allocated, to each mobile station.

5. The MBS feedback method according to claim 4, further comprising:

at the receiving of the MBS feedback information,

if the base station does not receive the MBS feedback information in the frame, allowing the base station to re-receive the MBS feedback information from the mobile station after a lapse of a predetermined frame.

6. The MBS feedback method according to claim 1, wherein the MBS feedback is a non-acknowledgment (NACK) feedback.

7. The MBS feedback method according to claim 1, wherein the ranging channel code is transmitted via an uplink message, and the uplink message is an uplink channel descriptor.

8. A Multicast Broadcast Service (MBS) feedback method comprising:

generating, by a first-group base station among base stations contained in a multi-cell multicast broadcast single frequency network (MBSFN) zone, a ranging channel code for a multicast broadcast service (MBS) feedback;

allocating the ranging channel code to a mobile station contained in a cell zone of the first-group base station; and

receiving the MBS feedback information based on the ranging channel code from the mobile station.

9. The MBS feedback method according to claim 8, further comprising:

after the receiving of the MBS feedback information,

generating a ranging channel code for an MBS feedback by a second-group base station except the first-group base station among several base stations contained in the MBSFN zone;

allocating the ranging channel code to a mobile station contained in a cell zone of the second-group base station; and

receiving the MBS feedback information based on the ranging channel code from the mobile station.

10. The MBS feedback method according to claim 9, further comprising:

adjusting, by the first-group base station and the second-group base station, a Modulation and Coding Scheme (MCS) level of the MBSFN zone using the received MBS feedback information.

11. The MBS feedback method according to claim 9, further comprising:

transmitting information of a frame, to which the ranging channel code is allocated, to each mobile station.

12. The MBS feedback method according to claim 11, further comprising:

at the receiving of the MBS feedback information,

if the base station does not receive the MBS feedback information in the frame,

re-receiving, by the base station, the MBS feedback after a lapse of a predetermined frame

13. A Multicast Broadcast Service (MBS) feedback method comprising:

generating, by specific base stations contained in a multi-cell multicast broadcast single frequency network (MBSFN) zone, a ranging channel code for a multicast broadcast service (MBS) feedback;

grouping mobile stations contained in the MBSFN zone;

allocating the ranging channel code to a mobile station, contained in a group managed by the specific base stations, among the grouped mobile stations; and

receiving the MBS feedback information based on the ranging channel code from the mobile station contained in the group managed by the specific base stations.

14. The MBS feedback method according to claim 13, wherein the grouping of the mobile stations is carried out using at least one of the number of ranging channel codes for the MBS feedback, the number of specific base stations, and the number of mobile stations contained in the MBSFN zone.

15. The MBS feedback method according to claim 13, further comprising:

adjusting a modulation and coding scheme (MCS) level according to the MBS feedback information.

16. The MBS feedback method according to claim 13, wherein a length of a cyclic prefix for the MBS feedback is longer than that of a general cyclic prefix.

17. A Multicast Broadcast Service (MBS) feedback method comprising:

receiving a message having a ranging channel code for a multicast broadcast service (MBS) feedback from a base station contained in a multi-cell multicast broadcast single frequency network (MBSFN) zone; and

transmitting MBS feedback information to the base station using the ranging channel code.

18. The MBS feedback method according to claim 17, further comprising:

periodically receiving information of a frame, to which the ranging channel code is allocated, from the base station.

19. The MBS feedback method according to claim 17, wherein the MBS feedback information is multicast broadcast service non-acknowledgement (MBS NACK) feedback information.