Method and system for scheduling data transmission in communication systems

• US 8,050,198 B2
• Filed: 11/13/2006
• Issued: 11/01/2011
• Est. Priority Date: 05/24/1999
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Chaponniere, Etienne Francios, Tse, David Ngar Ching, Black, Peter J., Bhushan, Naga
• Primary Examiner(s): Qureshi; Afsar M.
• Application Number:
  US11/559,263
• Publication Number:
  US 20070091841A1
• Time in Patent Office: 1,814 Days
• Field of Search: 370264-469, 455450-519, 455/562.1, 713/168
• US Class Current: 370/264
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A transmitter directed, distributed receiver using multi-user diversity provided by the distribution of the receiver. Advantage is taken of the uncorrelated variations over time in the condition of communication links between a common transmitter and several users. The greater the variation in the quality of a particular link over time, the greater the increase in total system throughput provided. A scheduler metric (or scheduler metric) represents the instantaneous quality of the communication link between each user and the transmitter with respect to the average quality of the link. Alternatively, the scheduler metric represents the instantaneous channel condition with respect to the average data throughput over that channel. The common transmitting station uses the scheduler metric to directly compare the desirability of granting each channel access with the desirability of granting each other channel access. The users with links that have the greatest scheduler metric are provided access to the channels.

Claims

1. A communication apparatus comprising a processor configured to:

assign each one of a plurality of users to at least one of a plurality of communication links in a communication system;

assign a scheduling metric to each one of the plurality of communication links, the scheduling metric being based in part on a ratio of a link quality and a user data throughput; and

select a number of the plurality of communication links for data transmission based on the assigned scheduling metric.

2. The communication apparatus of claim 1, further comprising a transmitter configured to transmit from a remote transmitting station to at least one of the plurality of users over at least one of the selected number of communication links over a common transmission time frame.

3. The communication apparatus of claim 2, wherein the plurality of communication links are over at least two different channel transmission frequencies.

4. The communication apparatus of claim 2, wherein the plurality of communication links are over at least two different transmission antennas.

5. The communication apparatus of claim 1, wherein the processor is further configured to determine the scheduling metric based on a ratio of an instantaneous link quality and an average user data throughput.

6. The communication apparatus of claim 5, wherein the instantaneous link quality corresponds to a carrier-to-interference ratio associated with a communication link.

7. The communication apparatus of claim 5, wherein the instantaneous link quality corresponds to a transmission data rate.

8. The communication apparatus of claim 1, wherein the scheduling metric is based at least on a communication link quality report received from at least one of the plurality of users.

9. The communication apparatus of claim 1, wherein the processor is further configured to determine the scheduling metric for each communication link based on at least one quality factor selected from a number of quality factors including:

a value representing data throughput,

a value representing user data throughput as determined by an amount of data transmitted to a user over a period of time over one or more of the communication links assigned to the user,

a value representing a highest possible communication data rate over at least one of the communication links assigned to the user, and

a value representing a ratio of instantaneous or filtered values of at least two of the number of quality factors.

10. The communication apparatus of claim 1, wherein the processor is further configured to assign the plurality of communication links to at least one of communication channels characterized by at least one of transmission frequency, transmission time, and transmit antenna.

11. A method for communication, comprising:

transmitting by a transmitter a communication link quality report associated with a plurality of communication channels, each communication channel characterized by at least one of transmission frequency, transmission time and transmit antenna; and

receiving data over a selected number of the plurality of communication channels over a common transmission time frame.

12. The method of claim 11, wherein the selected number of the plurality of communication channels are characterized by different transmission frequencies.

13. The method of claim 11, wherein the selected number of the plurality of communication channels are characterized by different transmit antennas.

14. The method of claim 11, wherein the data is received through a communication link on each of the selected number of the plurality of communication channels.

15. A communication apparatus, comprising:

means for transmitting a communication link quality report associated with a plurality of communication channels, each communication channel characterized by at least one of transmission frequency, transmission time and transmit antenna; and

means for receiving data over a selected number of the plurality of communication channels over a common transmission time frame.

16. The communication apparatus of claim 15, wherein the selected number of the plurality of communication channels are characterized by different transmission frequencies.

17. The communication apparatus of claim 15, wherein the selected number of the plurality of communication channels are characterized by different transmit antennas.