TRANSMISSION OF MULTICAST BROADCAST SERVICE (MBS) TRAFFIC IN A WIRELESS ENVIRONMENT

• US 20110069772A1
• Filed: 09/02/2010
• Published: 03/24/2011
• Est. Priority Date: 09/02/2009
• Status: Abandoned Application

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Fong, Mo-Kan, VRZIC, Sophie, Novak, Robert
• Application Number:
  US12/874,844
• Publication Number:
  US 20110069772A1
• Time in Patent Office: Days
• US Class Current: 375/261
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0016 involving special memory structures, e.g. look-up tables
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/0656 Cyclotomic systems, e.g. Bell Labs Layered Space-Time [BLAST]
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 25/0232 by interpolation between sounding signals
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/3488 Multiresolution systems
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation

Abstract

Multicast broadcast service (MBS) transmission in a multiple-input-multiple-output (MIMO) communication being transmitted using one of three modes, a single-layer mode, a spatial multiplexing (SM) mode and a hierarchical mode. In the hierarchical mode, lower quality data is transmitted over a first MIMO layer and enhancement data is transmitted over a second MIMO layer. A receiving device may only successfully receive the lower quality data or may successfully receive the enhancement data to enhance it with. The transmission scheme used, including the mode used, may be selectable, and may be selected based on feedback.

Claims

1. A method of performing a multicast broadcast service (MBS) transmission in a multiple-input-multiple-output (MIMO) communication comprising:

a. transmitting first data over a first MIMO layer, the first data being lower quality data; and

b. transmitting second data over a second MIMO layer, the second data being enhancement data for enhancing the lower quality data;

wherein, the MBS transmission is to be defined at a subscriber station by the result of enhancing the lower quality data with the enhancement data if the first and second data is successfully received, and the MBS transmission is to be defined at the subscriber station by the lower quality data alone if the first data is successfully received and the second data is not.

2. The method of claim 1, wherein the first data is sent over the first MIMO layer using a first encoding scheme and the second data is sent over the second MIMO layer using a second encoding scheme different from the first encoding scheme.

3. The method of claim 2, wherein the first encoding scheme is QPSK and the second encoding scheme is 16 QAM.

4. The method of claim 1, wherein the first data is sent over the first MIMO layer using a first encoding scheme and the second data is sent over the second MIMO layer using a second encoding scheme different from the first encoding scheme.

5. The method of claim 1, further comprising transmitting third data over a third MIMO layer, the third data being further enhancement data for further enhancing the lower quality data.

6. The method of claim 5, wherein further enhancing the lower quality data comprises applying the further enhancement data to the result of enhancing the lower quality data with the enhancement data.

7. A method of performing a multicast broadcast service (MBS) transmission in a multiple-input-multiple-output (MIMO) communication comprising:

a. transmitting first data over a first MIMO layer, the first data being lower quality data; and

b. selecting whether or not to transmit second data over a second MIMO layer, the second data being enhancement data for enhancing the lower quality data;

wherein, the MBS transmission is to be defined at a subscriber station by the result of enhancing the lower quality data with the enhancement data if the first and second data is successfully received, and the MBS transmission is to be defined at the subscriber station by the lower quality data alone if the first data is successfully received and the second data is not.

8. The method of claim 7, further comprising receiving from a subscriber station feedback indicative of a transmission condition, wherein the selecting whether or not to transmit second data is done on basis of the feedback.

9. The method of claim 8, further comprising on the basis of the feedback, selecting whether or not to transmit third data over a second MIMO layer, the third data being further enhancement data for further enhancing the lower quality data.

10. The method of claim 8, wherein the selecting whether or not to transmit second data is done on the basis of a geographical location.

11. The method of claim 9, wherein the selecting whether or not to transmit second data is done on the basis of a proximity to an edge of an area of MBS coverage.

12. A method for transmitting multicast broadcast service (MBS) traffic in a multiple-input-multiple-output (MIMO) communication comprising:

a. selecting a transmission format for transmitting MBS data from amongst a plurality of available transmission formats each having a transmission mode;

b. transmitting the MBS traffic using the selected transmission format;

wherein the plurality of available transmission format includes at least a one transmission format comprising one of a single-layer mode, a spatial multiplexing (SM) mode and a hierarchical mode and at least another transmission format comprising another one of a single-layer mode, a spatial multiplexing (SM) mode and a hierarchical mode.

13. The method of claim 12, wherein the plurality of transmission formats are defined in an MBS modulation coding scheme (MCS) table.

14. The method of claim 12, wherein the plurality of transmission formats include a first transmission format comprising a hierarchical mode.

15. The method of claim 14, wherein the first transmission format further comprises a first modulation and coding scheme for transmitting first data over a first layer and a second modulation and coding scheme for transmitting second data over a second layer, the second data being complementary to the first data.