Channel switching for support of multimedia broadcast and multicast services

• US 7,212,824 B2
• Filed: 08/07/2003
• Issued: 05/01/2007
• Est. Priority Date: 08/07/2002
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Terry, Stephen E.
• Primary Examiner(s): Gelin; Jean
• Application Number:
  US10/637,022
• Publication Number:
  US 20040116125A1
• Time in Patent Office: 1,363 Days
• Field of Search: 455/452.1, 455/452.2, 455/453, 455/450, 455/435.1, 455/436, 455/512, 455/522, 455/69, 455/3.06, 370/329, 370/347, 370/437, 370/336, 370/229, 370/431, 370/238, 370/328, 370/331
• US Class Current: 455/450
• 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 72/1263 Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 88/18 Service support devices; Network management devices

Abstract

The present invention includes a radio access network and a method for sending a multimedia broadcasts/multicast services (MBMS) using channel switching. The channel switching is between dedicated and shared/common channels. The invention also includes MBMS reception scheduling for use when a wireless transmit/receive device receives an MBMS service from multiple transmission sources. The sources transmitting the MBMS service data in differing orders. One embodiment uses in band segmentation information and another embodiment uses out of band synchronization information.

Claims

1. A method for transferring multimedia broadcasts/multicast services (MBMS) in a wireless communication system, the method comprising:

determining a number of users in a cell to receive the MBMS;

using the determined number of users to determine whether a dedicated channel or a shared/common channel is to be used for the MBMS;

receiving MBMS data; and

mapping the MBMS data to the determined dedicated or shared/common channel; and

wherein the determined dedicated or shared/common channel is based on a threshold test where if the determined number of users is below the threshold, a dedicated channel is used for the MBMS and if the determined number of users is above the threshold, a shared/common channel is used for the MBMS; and

wherein the threshold test has the threshold and a second threshold and if the determined number of users is above the second threshold, a common channel is used for the MBMS and if the determined number is between the threshold and the second threshold, a shared channel is used for the MBMS.

2. A method for transferring multimedia broadcasts/multicast services (MBMS) in a wireless communication system, the method comprising:

receiving MBMS data;

transmitting the MBMS data from a first MBMS transmitting source to a wireless transmit/receive unit (WTRU) along with segmentation information;

the WTRU receiving the MBMS data and the segmentation information from the first MBMS transmitting source;

the WTRU moving from the first MBMS transmitting source to a second MBMS transmitting source and receiving the MBMS data and segmentation information from the second source, the MBMS data from the first MBMS transmitting source and the second MBMS transmitting source being unsynchronized; and

the WTRU reassembling the MBMS data using the first and second MBMS transmitter source segmentation information.

3. A method for transferring multimedia broadcasts/multicast services (MBMS) in a wireless communication system, the method comprising:

receiving MBMS data;

transmitting the MBMS data from a first MBMS transmitting source to a wireless transmit/receive unit (WTRU) and out of band scheduling information;

the WTRU receiving the MBMS data from the first MBMS transmitting source and the out of band scheduling information;

the WTRU moving from the first MBMS transmitting source to a second MBMS transmitting source and receiving the MBMS data from the second source, the MBMS data from the first MBMS transmitting source and the second MBMS transmitting source being unsynchronized; and

the WTRU reassembling the MBMS data using the first and second transmitter source scheduling information.

4. A wireless transmit/receive unit (WTRU) for receiving a multimedia broadcasts/multicast services (MBMS) from a plurality of unsynchronized transmitting sources at differing times, the plurality of transmitting sources transmitting the MBMS data in an unsynchronized manner, the WTRU comprising:

a MBMS receiver for receiving MBMS segments from each of the transmitting sources;

a segmentation information recovery device for receiving segmentation information transmitted in band with the MBMS segments; and

a MBMS segmentation reassembly device for reassembling the MBMS segments based on the segmentation information.

5. The WTRU of claim 4 wherein the plurality of transmitting sources transmit the MBMS data over secondary common control physical channels (S-CCPCH) and the MBMS receiver receives the MBMS segments over the S-CCPCHs.

6. The WTRU of claim 5 wherein the MBMS receiver is also configurable to receive the MBMS segments over a dedicated channel.

7. A wireless transmit/receive unit (WTRU) for receiving a multimedia broadcasts/multicast services (MBMS) from a plurality of unsynchronized transmitting sources, the plurality of transmitting sources transmitting the MBMS data in an unsynchronized manner, the WTRU comprising:

a MBMS receiver for receiving MBMS segment from each of the transmitting sources;

a out of band synchronization information receiver for receiving out of band synchronization information from each of the transmitting sources;

a MBMS segmentation reassembly device for reassembling the MBMS segments based on the synchronization information.

8. A user equipment comprising:

a multimedia broadcast/multicast service (MBMS) receiver, in response to received signaling, to receive MBMS data segments of an MBMS service over a dedicated physical channel or a secondary common control physical channel, wherein the received MBMS segments originate from a plurality of cells transmitting the MBMS segments such that one of the plurality of cells is transmitting the MBMS segments ahead of at least one other of the plurality of cells; and

a MBMS segment reassembly device configured to reassembly the received MBMS segments from the plurality of cells in response to segmentation information transmitted with the MBMS segments.

9. The user equipment of claim 8 wherein the one of the plurality of cells is at least one radio frame time difference to the at least one other of the plurality of cells and the MBMS segment reassembly device reassembles the segments transmitted with at least one radio frame time difference.

10. The user equipment of claim 8 wherein the one of the plurality of cells is at least one TTI time difference to the at least one other of the plurality of cells and the MBMS segment reassembly device reassembles the segments transmitted with at least one TTI time difference.