Radio communication scheme for providing multimedia broadcast and multicast services (MBMS)

• US 20040116139A1
• Filed: 09/23/2003
• Published: 06/17/2004
• Est. Priority Date: 09/23/2002
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Young Dae, Yi, Seung June, Lee, So Young
• Granted Patent: US 7,623,483 B2
• Time in Patent Office: Days
• US Class Current: 455/503
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• 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 76/40 for selective distribution or broadcast

Abstract

A radio communication scheme applicable to UMTS providing packet data services, such as multimedia broadcast and multicast services (MBMS), to one or more users by modifying (augmenting) certain existing radio communication protocols while employing a new transport channel (a point-to-multipoint DSCH), and/or by establishing new physical downlink shared channels (C-PDSCH and D-PDSCH). An RLC layer is provided in a single CRNC so that the same MBMS can be transmitted to a plurality of terminals via a point-to-multipoint DSCH, without having to repetitively provide many RLC layers in many SRNCs. Alternatively, a C-PDSCH (physical downlink shared channel for control) and a D-PDSCH (physical downlink shared channel for data) are established to allow periodic transmission of MBMS, permitting users to simultaneously access one or more MBMS.

Claims

1. A method of providing multicasting service to a plurality of users in radio communication, the method comprising

establishing three or more data transmission states for radio communication;

employing two or more state transition conditions to change or maintain the data transmission state; and

providing data of the multicasting service to the user with a particular data transmission state determined by the state transition conditions.

2. The method of claim 1, wherein two of the data transmission states relate to a dedicated channel.

3. The method of claim 2, wherein, of the two data transmission states, one data transmission state is based upon point-to-point data transmission, and the other data transmission state is based upon point-to-multipoint data transmission.

4. The method of claim 1, wherein one of the data transmission states pertains to a forward access channel.

5. The method of claim 1, wherein one data transmission state directly transitions to another data transmission state in accordance with the transition conditions.

6. The method of claim 1, wherein the state transition conditions comprise, a total number of users, and parameters for radio communication resources.

7. A method for providing a multicasting service in a radio communication system, the method comprising:

establishing a data-only shared data channel and a control-only shared control channel; and

transmitting data of the multicasting service via the established shared data channel and the established shared control channel.

8. The method of claim 7, wherein the channels are physical layer channels.

9. The method of claim 7, wherein the shared data channel is a physical downlink shared channel for data (D-PDSCH).

10. The method of claim 7, wherein the shared control channel is a physical downlink shared channel for control (C-PDSCH).

11. The method of claim 7, wherein the channels are uni-directional.

12. The method of claim 7, wherein the data-only shared data channel and the control-only shared control channel are separate channel.