Multi-media broadcast and multicast service (MBMS) in a wireless communication system

• US 20050075124A1
• Filed: 11/18/2004
• Published: 04/07/2005
• Est. Priority Date: 05/06/2002
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wei, Yongbin, Chen, Tao, Vayanos, Alkinoos Hector, Willenegger, Serge
• Granted Patent: US 7,593,746 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/152 Bose-Chaudhuri-Hocquenghem [BCH] codes
• CPC Class Codes: H03M 13/19 Single error correction without using particular properties of the cyclic codes, e.g. Hamming codes, extended or generalised Hamming codes
• CPC Class Codes: H03M 13/23 using convolutional codes, e.g. unit memory codes
• CPC Class Codes: H03M 13/2707 Simple row-column interleaver, i.e. pure block interleaving
• CPC Class Codes: H03M 13/2915 with an error detection code in one dimension
• CPC Class Codes: H03M 13/2957 Turbo codes and decoding
• CPC Class Codes: H03M 13/373 with erasure correction and erasure determination, e.g. for packet loss recovery or setting of erasures for the decoding of Reed-Solomon codes
• CPC Class Codes: H04B 1/712 Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0067 Rate matching H04L1/0013 and H04L1/08 take precedence
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 1/08 : by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04W 52/322 : Power control of broadcast channels
• CPC Class Codes: H04W 52/325 : Power control of control or pilot channels
• CPC Class Codes: H04W 52/327 : Power control of multicast channels
• CPC Class Codes: H04W 52/40 : during macro-diversity or soft handoff

Abstract

Techniques to implement MBMS services in a wireless communication system. In one aspect, a method is provided for processing data for transmission to a plurality of terminals. Frames of information bits (which may have variable rates) are provided to a buffer implementing a matrix. The matrix is padded with padding bits based on a particular padding scheme to support variable frame rates. The frames are then coded based on a particular block code to provide parity bits. The frame of information bits and the parity bits are then transmitted to the terminals. In another aspect, a method is provided for controlling the transmit power of a data transmission to a plurality of terminals. In accordance with the method, TPC streams are received from the terminals and processed to obtain a stream of joint power control commands used to adjust the transmit power of the data transmission.

Claims

1. In a wireless communication system, a method for controlling transmit power of a data transmission to a plurality of terminals, comprising:

receiving a plurality of uplink transmit power control (TPC) streams from the plurality of terminals;

processing the plurality of uplink TPC streams to obtain a stream of joint power control commands for the data transmission; and

adjusting the transmit power of the data transmission based on the stream of joint power control commands.

2. The method of claim 1, wherein a single uplink TPC stream is received from each of the plurality of terminals.

3. The method of claim 2, wherein the single uplink TPC stream received from each terminal includes power control commands for controlling transmit powers of multiple downlink data transmissions to the terminal, and wherein one of the multiple downlink data transmissions is the data transmission to the plurality of terminals.

4. The method of claim 3, wherein the single uplink TPC stream includes a power control command for each power control interval, and wherein the power control command is set to increase transmit power if an increase in transmit power is needed for any of the multiple downlink data transmissions.

5. The method of claim 1, wherein the joint power control command for each power control interval is determined based a plurality of power control commands in the plurality of uplink TPC streams received from the plurality of terminals for that power control interval.

6. The method of claim 5, wherein the joint power control command for each power control interval is set to increase the transmit power of the data transmission if any power control command received in the plurality of uplink TPC streams for that power control interval requests an increase in transmit power for the data transmission.

7. The method of claim 1, wherein for each of the plurality of terminals, one uplink TPC stream is received from the terminal for each downlink data transmission to be power controlled.

8. The method of claim 1, further comprising:

sending a downlink TPC stream to each of the plurality of terminals.

9. The method of claim 8, wherein a plurality of downlink TPC streams are transmitted to the plurality of terminals in a multiplexed manner on a single power control channel.

10. The method of claim 8, wherein the plurality of downlink TPC streams are transmitted to the plurality of terminals in a time division multiplexed manner on the single power control channel.

11. An apparatus in a wireless communication system, comprising:

means for receiving a plurality of uplink transmit power control (TPC) streams from a plurality of terminals;

means for processing the plurality of uplink TPC streams to obtain a stream of joint power control commands for the data transmission; and

means for adjusting the transmit power of the data transmission based on the stream of joint power control commands.