Scheduling techniques for a packet-access network

• US 7,653,028 B2
• Filed: 10/03/2002
• Issued: 01/26/2010
• Est. Priority Date: 10/03/2002
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Shiu, Da-shan, Malladi, Durga P.
• Primary Examiner(s): Sefcheck; Gregory B
• Application Number:
  US10/264,434
• Publication Number:
  US 20040066766A1
• Time in Patent Office: 2,672 Days
• Field of Search: 370/209, 370/252, 370/328, 370/335, 370/342, 370/441
• US Class Current: 370/335
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference

Abstract

Multiple access interference may be substantially removed by introducing a near-far situation in which a near mobile and a far mobile (“near” and “far” based on signal strength) are selected, resources allocated among these and other mobiles, and the data is packetized for transmission during a transmission interval such that the data intended for the far mobile is transmitted along with the data intended for the near mobile. Forward link signals are then appropriately scheduled. Signals intended for the far mobile and the near mobile are decoded from the composite signal received at the near mobile. The signal intended for the far mobile is then removed from the composite signal received at the near mobile.

Claims

1. A method of operating a base station for a wireless communication system, the method comprising:

at the base station;

receiving channel state feedback information from a first mobile station and a second mobile station;

configuring for a near-far situation of the first and second mobile stations, including;

selecting the first mobile station as a near mobile station and the second mobile station as a far mobile station based on the received channel state feedback information;

allocating resources among a plurality of mobile stations including the near and far mobile stations;

packetizing data and control information for transmission during a transmission interval into forward-link signals such that a signal intended for the far mobile station is transmitted along with a signal intended for the near mobile station in a single channel and that the near mobile station is able to remove the signal intended for the far mobile station from a received signal based on the control information; and

transmitting the forward-link signals to the near and far mobile stations.

2. The method of claim 1, wherein:

the wireless communication system uses a Ix evolution for data and voice (IxEVDV) service; and

the forward link signals comprise;

the signal intended for the near mobile station comprising first packet data on a forward packet data channel (F-PDCH);

the signal intended for the far mobile station comprising second packet data on the forward packet data channel (F-PDCH); and

the control information on a forward packet data control channel (F-PDCCH).

3. The method of claim 2, wherein:

the control information includes a control packet corresponding to each packet data; and

each control packet comprises code tree information, an outer cyclic redundancy code (CRC), and an inner CRC.

4. The method of claim 3, wherein the near mobile station checks the outer CRC and then the inner CRC of each control packet to determine whether the corresponding data packet is intended for the near mobile station or for the far mobile station.

5. The method of claim 1, wherein the near and far mobile stations are defined as near and far, respectively, based on measured signal to interference and noise ratios (SINRs) of signals at the near and far mobile stations, respectively.

6. A base station for a wireless communication system, the base station comprising:

a transceiver configured to receive channel state feedback information from a first mobile station and a second mobile station;

a processor including a scheduler configured to;

select the first mobile station as a near mobile station and the second mobile station as a far mobile station based on the received channel state feedback information;

allocate resources among a plurality of mobile stations including the near and far mobile stations; and

packetize data and control information for transmission during a transmission interval into forward-link signals such that a signal intended for the far mobile station is transmitted along with a signal intended for the near mobile station in a single channel and that the near mobile station is able to remove the signal intended for the far mobile station from a received signal based on the control information; and

the transceiver is further configured to transmit the forward-link signals to the near and far mobile stations.

7. The base station of claim 6, wherein:

the wireless communication system uses a Ix evolution for data and voice (IxEVDV) service; and

the forward link signals comprise;

the signal intended for the near mobile station comprising first packet data on a forward packet data channel (F-PDCH);

the signal intended for the far mobile station comprising second packet data on the forward packet data channel (F-PDCH); and

the control information on a forward packet data control channel (F-PDCCH).

8. The method of claim 7, wherein:

the control information includes a control packet corresponding to each packet data; and

each control packet comprises code tree information, an outer cyclic redundancy code (CRC), and an inner CRC.

9. The method of claim 8, wherein the near mobile station checks the outer CRC and then the inner CRC of each control packet to determine whether the corresponding packet data is intended for the near mobile station or for the far mobile station.

10. A mobile station for a wireless communication system, the mobile station comprising:

a transceiver configured to;

transmit channel state feedback information to a base station; and

receive from the base station forward-link signals including control information in a single channel; and

a processor configured to;

determine from the received forward-link signals, a first signal intended for the mobile station as a near mobile station and a second signal intended for a second mobile station as a far mobile station, wherein both the first signal and second signal were received in the single channel and the mobile station is classified as a near mobile station based on the transmitted channel state feedback information; and

remove the second signal intended for the far mobile station from the forward-link signals received by the near mobile station based on the received control information.

11. The mobile station of claim 10, wherein the processor is configured to remove the second signal intended for the far mobile station from the forward-link signals received by the near mobile station after an outer and inner CRC fields pass verification.

12. The mobile station of claim 10, wherein:

the wireless communication system uses a Ix evolution for data and voice (IxEVDV) service; and

the first signal comprises first packet data received on a forward packet data channel (F-PDCH);

the second signal comprises second packet data received on the forward packet data channel (F-PDCH); and

the control information is received on a forward packet data control channel (F-PDCCH).

13. The mobile station of claim 12, wherein:

the control information includes a control packet corresponding to each packet data; and

each control packet comprises code tree information, an outer cyclic redundancy code (CRC), and an inner CRC.

14. The method of claim 13, wherein the near mobile station checks the outer CRC and then the inner CRC of each control packet to determine whether the corresponding packet data is intended for the near mobile station or for the far mobile station.

15. A method of operating a mobile station for wireless communication, comprising:

transmitting channel state feedback information to the base station;

receiving forward-link signals including control information from the base station in a single channel;

determining from the received forward-link signals, a first signal intended for the mobile station as a near mobile station and a second signal intended for a second mobile station as a far mobile station, wherein both the first signal and second signal were received in the single channel and the mobile station is classified as a near mobile station based on the transmitted channel state feedback information; and

removing the second signal intended for the far mobile station from the forward-link signals received by the near mobile station based on the control information.

16. The method of claim 15, wherein prior to removing the second signal intended for the far mobile station from the forward-link signals received by the near mobile station, determining that an outer and inner CRC fields pass verification.

17. The method of claim 15, wherein:

the mobile station and the base station use a Ix evolution for data and voice (IxEV-DV) service for wireless communication;

the first signal comprises first packet data received on a forward packet data channel (F-PDCH);

the second signal comprises second packet data received on the forward packet data channel (F-PDCH); and

the control information is received on a forward packet data control channel (FPDCCH).

18. The method of claim 17, wherein:

the control information includes a control packet corresponding to each packet data; and

each control packet comprises code tree information, an outer cyclic redundancy code (CRC), and an inner CRC.

19. The method of claim 18, wherein the near mobile station checks the outer CRC and then the inner CRC of each control packet to determine whether the corresponding packet data is intended for the near mobile station or for the far mobile station.

20. A base station for a wireless communication system, comprising:

means for receiving channel state feedback information from a first mobile station and a second mobile station;

means for configuring for a near-far situation of the first and second mobile stations, including;

means for selecting the first mobile station as a near mobile station and the second mobile station as a far mobile station based on the received channel state feedback information;

means for allocating resources among a plurality of mobile stations including the near and far mobile stations;

means for packetizing data and control information for transmission during a transmission interval into forward-link signals such that a signal intended for the far mobile station is transmitted along with a signal intended for the near mobile station in a single channel and that the near mobile station is able to remove the signal intended for the far mobile station from a received signal based on the control information; and

means for transmitting the forward-link signals to the near and far mobile stations.

21. A mobile station for wireless communication, comprising:

means for transmitting channel state feedback information to the base station;

means for receiving forward-link signals including control information from the base station in a single channel;

means for determining from the received forward-link signals, a first signal intended for the mobile station as a near mobile station and a second signal intended for a second mobile station as a far mobile station, wherein both the first signal and second signal were received in the single channel and the mobile station is classified as a near mobile station based on the transmitted channel state feedback information; and

means for removing the second signal intended for the far mobile station from the forward-link signals received by the near mobile station based on the control information.

22. A computer-readable medium including program code stored thereon, comprising:

program code to receive channel state feedback information from a first mobile station and a second mobile station;

program code to configure for a near-far situation of the first and second mobile stations, including;

program code to select the first mobile station as a near mobile station and the second mobile station as a far mobile station based on the received channel state feedback information;

program code to allocate resources among a plurality of mobile stations including the near and far mobile stations;

program code to packetize data and control information for transmission during a transmission interval into forward-link signals such that a signal intended for the far mobile station is transmitted along with a signal intended for the near mobile station in a single channel and that the near mobile station is able to remove the signal intended for the far mobile station from a received signal based on the control information; and

program code to transmit the forward-link signals to the near and far mobile stations.

23. A computer-readable medium including program code stored thereon, comprising:

program code to transmit channel state feedback information to the base station;

logic configure to receive forward-link signals including control information from the base station in a single channel;

program code to determine from the received forward-link signals, a first signal intended for the mobile station as a near mobile station and a second signal intended for a second mobile station as a far mobile station, wherein both the first signal and second signal were received in the single channel and the mobile station is classified as a near mobile station based on the transmitted channel state feedback information; and

program code to remove the second signal intended for the far mobile station from the forward-link signals received by the near mobile station based on the control information.