Source: https://patents.google.com/patent/US9756481B2/en
Timestamp: 2019-11-13 11:17:00
Document Index: 359947682

Matched Legal Cases: ['Application No. 60', 'Application No. 03', 'Application No. 099105086', 'Application No. 2011', 'Application No. 2009100005367', 'Application No. 200910005367', 'Application No. 10', 'Application No. 200910005367', 'Application No. 10', 'Application No. 200910005367', 'Application No. 03784933', 'Application No. 2', 'Application No. 099105086', 'Application No. 03784933', 'Application No. 10', 'Application No. 20091005367', 'Application No. 10', 'Application No. 2', 'Application No. 100120265', 'Application No. 2', 'Application No. 10', 'Application No. 10', 'Application No. 099105086', 'Application No. 20051027', 'Application No. 103144066', 'Application No. 10', 'Application No. 20051027', 'Application No. 099105086', 'Application No. 100120265', 'Application No. 100120265', 'Application No. 103144066', 'Application No. 03784933', 'Application No. 1250', 'Application No. 20051027', 'Application No. 2011', 'Application No. 10', 'Application No. 20051027', 'Application No. 12193703']

US9756481B2 - Method and wireless transmit/receive unit (WTRU) for receiving multimedia broadcast/multicast service - Google Patents
Method and wireless transmit/receive unit (WTRU) for receiving multimedia broadcast/multicast service Download PDF
US9756481B2
US9756481B2 US14/667,571 US201514667571A US9756481B2 US 9756481 B2 US9756481 B2 US 9756481B2 US 201514667571 A US201514667571 A US 201514667571A US 9756481 B2 US9756481 B2 US 9756481B2
US14/667,571
US20150201310A1 (en
2011-07-21 Priority to US13/187,812 priority patent/US8417245B2/en
2013-03-07 Priority to US13/789,452 priority patent/US9014710B2/en
2015-03-24 Priority to US14/667,571 priority patent/US9756481B2/en
2015-07-16 Publication of US20150201310A1 publication Critical patent/US20150201310A1/en
2017-09-05 Publication of US9756481B2 publication Critical patent/US9756481B2/en
This application is a continuation of U.S. patent application Ser. No. 13/789,452, filed Mar. 7, 2013; which is a continuation of U.S. patent application Ser. No. 13/187,812, filed Jul. 21, 2011, now U.S. Pat. No. 8,417,245, issued Apr. 9, 2013; which is a continuation of U.S. patent application Ser. No. 11/784,392, filed Apr. 6, 2007, now U.S. Pat. No. 7,986,950, issued Jul. 26, 2011; which is a continuation of U.S. patent application Ser. No. 10/637,022, filed Aug. 7, 2003, now U.S. Pat. No. 7,212,824, issued May 1, 2007; which claims the benefit of priority from U.S. Provisional Patent Application No. 60/402,161, filed Aug. 7, 2002, all of which applications are incorporated herein by reference in their entireties.
There is a growing desire to use multimedia broadcasts/multicast services (MBMS) in wireless communication systems. For a particular MBMS, a given cell in the network may have none, one, or multiple users, wireless transmit/receive units (WTRUs), subscribed to that MBMS. As users migrate between cells, a cell that may originally have one or no users subscribed to the service may at a later point have multiple subscribed users. Conversely, a cell that may at one point have multiple subscribed users may at another time have only one or no users.
Another potential problem resulting from user migration IS MBMS scheduling. As an MBMS user moves between cells, that user needs to reconstruct the MBMS service from information received from both cells. If both cells synchronize their MBMS transmissions, the MBMS user can seamlessly move between the cells.
However, such a scenario is typically not practical and undesirable. At certain time intervals based on the cell's loading and available resources, a cell may have more available resources to support the MBMS transmission than at another time. As a result, at that time, it is desirable for that cell to transmit a large amount of the MBMS data. For another cell at that same time interval, resources to support the same MBMS bandwidth may not be available. As a result, it may be desirable to schedule the MBMS transmissions differently between the cells, to better utilize such resources. As the MBMS user moves between cells, the new cell that the user has moved into may have transmissions either ahead or behind the other cell's transmissions. As a result, the MBMS user may miss MBMS data or needlessly receive redundant MBMS data.
FIG. 3 is a flow chart for coordinating reception of an MBMS transmission from multiple sources using in band segmentation information.
FIG. 4 is a flow chart for coordinating reception of an MBMS transmission from multiple sources using out of band segmentation information.
FIG. 1 is a flow chart for channel switching for an MBMS. In a particular cell, the number of WTRU s subscribed to the service is determined or estimated, step 20. Typically, this information is known. Using the number of WTRUs in the cell and/or other cell information, such as information on cell conditions, available cell resources, etc., a choice of whether dedicated channels, a common/shared channel, or both are used, step 22. After the channel choice is made, the MBMS data is mapped to the corresponding channel(s), step 24. One possible approach to determine which type(s) of channels should be used is a threshold test. If below a certain threshold number of WTRUs are in the cell, dedicated channels are used. The dedicated channels allow for power control and transmit diversity techniques to be employed. These techniques are highly desirable when high data rate MBMS transfers are made, to efficiently use the available resources.
If the number of WTRUs exceed the threshold, a common/shared channel is used, such as a shared channel, a high speed shared channel, or a secondary common control physical channel (S-CCPCR). A shared channel or high speed shared channel can be used to transfer the MBMS data to multiple WTRUs simultaneously. The SCCPCR can be used to broadcast the MBMS data to multiple users. Typically, the shared/common channels are less radio resource efficient.
Under certain circumstances, it may be desirable to use both shared and dedicated channels to support an MBMS. To illustrate, many subscribing WRTU s may be located together, such as at a train station, and a few or a single WTRU may be outside of the train station. In such a situation, the most efficient use of cell resources to support the MBMS may be to allocate a shared channel to the train station WTRU s and a dedicated channel to the other WTRU. As the number of users in a cell changes, the cell conditions change or periodically, the channel choice is repeated using the new information, step 26.
The C-DSCH may be physically identical to the D-DSCH. However, a distinguishing characteristic is that the signaling for the DSCH transmission for the individual user associated with a dedicated channel within the MBMS user group is that the transmission is synchronized. This allows all users in the MBMS user group to receive the common DSCH transmission. An indication may be signaled along with MBMS transmissions to indicate that the MBMS transmission is either dedicated to a particular user or common to the users in the MBMS user group. This allows for proper operation of power control techniques, transmit diversity, or any other unique physical transmission attributes. The MBMS transitions between dedicated and common DSCH is preferably transparent to the WTRU 40.
FIG. 3 is a flow chart for using in-band segmentation information to handle differing MBMS transmission orders either inter-cell or between cells. Along with the MBMS transmissions, segmentation information is sent along with the MBMS data, step 42. This segmentation information typically includes a segment identifier so that each receiving WTRU is aware of which segments that it has received. As a particular WTRU moves between MBMS transmission sources (between cells or switched channels), step 44, the WTRU can receive segments from the new MBMS source and reassemble the transmissions to recover all the MBMS data, step 46.
FIG. 5 is a simplified block diagram of a WTRU 40 for receiving the differing MBMS transmissions. The WTRU 40 receives the MBMS transmissions using an antenna 54. An MBMS receiver 56 receives the MBMS transmissions from the differing transmission sources, including the in band segmentation information. A segmentation information recovery device 58 recovers the segmentation information. Using the segmentation information and received MBMS segments, an MBMS segmentation reassembly device 60 reassembles the segments to recover the MBMS data.
FIG. 4 is a flow chart for using out of band transmission scheduling information to handle differing MBMS transmission orders. A WTRU receives an MBMS transmission from a particular source, step 48. The WTRU also receives out of band scheduling information, step 50. As the WTRU moves to a different source, the WTRU can receive MBMS data from the new source and using that source's out of band scheduling data reassemble the MBMS received segments, step 52.
FIG. 6 is a simplified block diagram of a WTRU 40 for receiving the differing MBMS transmissions. The WTRU 40 receives the MBMS transmissions using an antenna 54. An MBMS receiver 62 receives the MBMS transmissions from the differing transmission sources. An out of band synchronization information device 64 receives synchronization information from the multiple transmission sources. Using the synchronization information and received MBMS segments, an MBMS segmentation reassembly device 66 reassembles the segments to recover the MBMS data.
Both the approaches of FIGS. 3 and 4 allow for users existing within the cell to just transition between dedicated and common channels without interruption or delay in the MBMS transmission. Additionally, WTRU s entering the cell can maintain continuous reception of the MBMS service, even though the sequence of transmission between the new and old cell are different. Once MBMS transmission data is received, the WTRU reorders the information according to the in band segmentation and/or out of band transmission scheduling information.
Since either in band segmentation or out of band scheduling is provided, lost or failed transmissions can be efficiently recovered by the WTRU's knowledge of when retransmission is expected. The RNC MBMS retransmission scheduling can also be reduced by taking into account intelligent reception by the WTRU s. To illustrate, if the RNC knows all the users have received a particular MBMS segment, retransmission of that segment can be prevented.
1. A wireless transmit/receive unit (WTRU) for receiving a multimedia broadcast/multicast service (MBMS) data, the WTRU comprising:
an antenna for transmission or reception of MBMS signals;
an MBMS receiver to:
receive data of an MBMS service from a first source over a first channel comprising one of a secondary common control physical channel (S-CCPCH) or a dedicated channel, and receive out of band scheduling information for the data received from the first source, the scheduling information being out of band with the first channel, and
after the reception of the data of the MBMS service over the first channel, receive data of the MBMS service from a second source over a second channel in response to a movement of the WTRU, and receive out of band scheduling information for the data received from the second source, the scheduling information being out of band with the second channel, the second channel comprising a channel type different than the first channel and comprising the other of the dedicated channel or the S-CCPCH; and
an MBMS reassembly device to reassemble the received MBMS data from both the first channel and the second channel based, at least in part, on the received out of band transmission scheduling information for the data received from the second source.
2. The WTRU of claim 1, wherein the WTRU is configured to switch the receiving of the data over the S-CCPCH to the dedicated channel in further response to a signal indicating the switch.
3. The WTRU of claim 2, wherein the WTRU is configured to perform the switch at an indicated radio frame.
4. The WTRU of claim 3, wherein:
the MBMS receiver is to receive the MBMS data over the first channel and the second channel from a plurality of unsynchronized cells.
5. The WTRU of claim 2, wherein the signal indicates the out of band transmission scheduling information.
6. The WTRU of claim 1, wherein the first channel comprises the S-CCPCH and the second channel comprises the dedicated channel, and wherein:
the MBMS receiver is to receive a first wireless signal including the received data of the MBMS service over the first channel and a second wireless signal including the received data of the MBMS service over the second channel, the second signal being a beam formed signal.
7. The WTRU of claim 1, wherein the first channel comprises the dedicated channel and the second channel comprises the S-CCPCH, and the WTRU further comprising:
the MBMS receiver is to receive a first wireless signal including the received data of the MBMS service over the first channel and a second wireless signal including the received data of the MBMS service over the second channel, the first signal being a beam formed signal.
8. A wireless transmit/receive unit (WTRU) for receiving a multimedia broadcast/multicast service (MBMS) data, the WTRU comprising:
means for receiving data of an MBMS service from a first source over a first channel comprising one of a secondary common control physical channel (S-CCPCH) or a dedicated channel, and for receiving out of band scheduling information for the data received from the first source, the scheduling information being out of band with the first channel;
after the reception of the data of the MBMS service over the first channel, means for receiving data of the MBMS service from a second source over a second channel in response to a movement of the WTRU, and for receiving out of band scheduling information for the data received from the second source, the scheduling information being out of band with the second channel, the second channel comprising a channel type different than the first channel and comprising the other of the dedicated channel or the S-CCPCH; and
means for reassembling the received MBMS data from both the first channel and the second channel based, at least in part, on the received out of band transmission scheduling information for the data received from the second source.
9. The WTRU of claim 8, wherein the WTRU is configured to switch the receiving of the data over the S-CCPCH to the dedicated channel in further response to a signal indicating the switch.
10. The WTRU of claim 9, wherein the signal indicates the out of band transmission scheduling information.
11. The WTRU of claim 10, further comprising:
means for receiving the MBMS data from a plurality of unsynchronized cells.
12. The WTRU of claim 9, wherein the WTRU is configured to perform the switch at an indicated radio frame.
13. The WTRU of claim 8, wherein the first channel comprises the S-CCPCH and the second channel comprises the dedicated channel, and the WTRU further comprising:
means for receiving a first wireless signal including the received data of the MBMS service over first channel and a second wireless signal including the received data of the MBMS service over the second channel, the second signal being a beam formed signal.
14. The WTRU of claim 8, wherein the first channel comprises the dedicated channel and the second channel comprises the S-CCPCH, and the WTRU further comprising:
means for receiving a first wireless signal including the received data of the MBMS service over the first channel and a second wireless signal including the received data of the MBMS service over the second channel, the first signal being a beam formed signal.
15. A method for use by a wireless transmit/receive unit (WTRU) for receiving multimedia broadcast/multicast service (MBMS) data, the method comprising:
receiving data of an MBMS service from a first source over a first channel comprising one of a secondary common control physical channel (S-CCPCH) or a dedicated channel, and receiving out of band scheduling information for the data received from the first source, the scheduling information being out of band with the first channel;
after the reception of the data of the MBMS service over the first channel, receiving data of the MBMS service from a second source over a second channel in response to a movement of the WTRU, and receiving out of band scheduling information for the data received from the second source, the scheduling information being out of band with the second channel, the second channel comprising a channel type different than the first channel and comprising the other of the dedicated channel or the S-CCPCH: and
reassembling the received MBMS data from both the first channel and the second channel based, at least in part, on the received out of band transmission scheduling information for the data received from the second source.
16. The method of claim 15, further comprising switching the reception of the data over the S-CCPCH to the dedicated channel in further response to a signal indicating the switch.
17. The method of claim 16, wherein the signal indicates the out of band transmission scheduling information.
receiving the MBMS data from a plurality of unsynchronized cells.
19. The method of claim 16, wherein the switching is performed at an indicated radio frame.
20. The method of claim 15, wherein the first channel comprises the S-CCPCH and the second channel comprises the dedicated channel, and the method further comprising:
receiving a first wireless signal including the received data of the MBMS service over the first channel and a second wireless signal including the received data of the MBMS service over the second channel, the second signal being a beam formed signal.
21. The method of claim 15, wherein the first channel comprises the dedicated channel and the second channel comprises the S-CCPCH, and the method further comprising:
receiving a first wireless signal including the received data of the MBMS service over the first channel and a second wireless signal including the received data of the MBMS service over the second channel, the first signal being a beam formed signal.
after the reception of the data of the MBMS service over the first channel, receiving data of the MBMS service from a second source over a second channel in response to a movement of the WTRU, and receiving out of band scheduling information for the data received from the second source, the scheduling information being out of band with the second channel, the second channel comprising a channel type different than the first channel and comprising the other of the dedicated channel or the S-CCPCH; and
US14/667,571 2002-08-07 2015-03-24 Method and wireless transmit/receive unit (WTRU) for receiving multimedia broadcast/multicast service Active 2023-11-07 US9756481B2 (en)
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