Multi-sector rate control

• US 7,885,239 B1
• Filed: 06/12/2007
• Issued: 02/08/2011
• Est. Priority Date: 06/12/2007
• Status: Active Grant

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Canjeevaram, Ashvini Ganesh G., Oroskar, Siddarth S., Shetty, Manoj, Vargantwar, Sachin R.
• Primary Examiner(s): Chang; Kent
• Assistant Examiner(s): HTUN, SAN A
• Application Number:
  US11/761,613
• Time in Patent Office: 1,337 Days
• Field of Search: 370/336, 370/337, 370/347, 370/498, 370/442, 370/468, 370/326, 370/345, 455442-453, 455/532.1, 455/434, 455/435.2, 455/436, 455/438, 455/439
• US Class Current: 370/336
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point

Abstract

An improved mechanism for managing allocation of air interface timeslots for transmission of data to access terminals. When an access terminal requests an access network to transmit data to the access terminal in a first sector, the access terminal will identify within its request a second sector that the access network can optionally use instead. The access network will then determine whether a threshold number of upcoming timeslots in the first sector are already scheduled to carry data to other access terminals and whether at least one of those timeslots is available for use in the second sector. If so, the access network will then responsively transmit the data to the access terminal in the at least one timeslot on the second sector. Advantageously, this process can help to increase sector throughput.

Claims

1. In an access network, a method comprising:

receiving into the access network over a wireless air interface from a given access terminal a data transmission request specifying at least a primary sector and a secondary sector;

in response to the received data transmission request, making a determination at the access network that (i) in the primary sector a threshold number of upcoming timeslots are currently scheduled for use to carry data to one or more other access terminals prior to any timeslot available to carry data to the given access terminal, and (ii) at least one timeslot is available in the secondary sector to carry data to the given access terminal sooner than the any timeslot available in the primary sector; and

in response at least to the determination, scheduling the at least one timeslot for use to transmit data from the access network to the given access terminal in the secondary sector.

2. The method of claim 1, wherein the data transmission request comprises an expanded Data Rate Control (DRC) request.

3. The method of claim 2, wherein the expanded DRC request identifies the primary sector with a primary DRC_cover parameter and identifies the secondary sector with a secondary DRC_cover.

4. The method of claim 3, wherein the expanded DRC request further specifies a primary DRC code for the primary sector and a secondary DRC code for the secondary sector.

5. The method of claim 4, further comprising:

the access network further conditioning the determination on the primary DRC code and secondary DRC code being within a threshold of each other.

6. The method of claim 1, wherein the access network comprises a radio network controller at which the method is carried out.

7. In an access network, a method comprising:

receiving into the access network over a wireless air interface from a given access terminal a data transmission request specifying at least a primary sector and a secondary sector;

in response to the received data transmission request, making a first determination at the access network of whether a threshold number of upcoming timeslots are scheduled for use to carry data to one or more other access terminals in the primary sector prior to any timeslot available in the primary sector to carry data to the given access terminal;

in response at least to the first determination being negative, scheduling at least one timeslot of the upcoming timeslots for use to transmit data from the access network to the given access terminal in the primary sector;

in response to the first determination being positive, making a second determination at the access network of whether at least one timeslot is available for use in the secondary sector to carry data to the given access terminal sooner than the any timeslot available in the primary sector; and

in response at least to the second determination being positive, scheduling the at least one timeslot for use to transmit data from the access network to the given access terminal in the secondary sector.

8. The method of claim 7, wherein the data transmission request comprises an expanded Data Rate Control (DRC) request and further specifies a primary DRC code for the primary sector and a secondary DRC code for the secondary sector.

9. In an access network, a method comprising:

receiving into the access network over a wireless air interface from a given access terminal a data transmission request specifying at least a primary sector, a secondary sector, and a tertiary sector;

in response to the received data transmission request, making a first determination at the access network of whether a threshold number of upcoming timeslots are scheduled for use to carry data to one or more other access terminals in the primary sector prior to any timeslot available in the primary sector to carry data to the given access terminal;

in response at least to the first determination being negative, scheduling at least one timeslot of the upcoming timeslots for use to transmit data from the access network to the given access terminal in the primary sector;

in response to the first determination being positive, making a second determination at the access network of whether the threshold number of upcoming timeslots are scheduled for use to carry data to one or more other access terminals in the secondary sector prior to any timeslot available in the secondary sector to carry data to the given access terminal; and

in response at least to the second determination being negative, scheduling at least one timeslot of the upcoming timeslots for use to transmit data from the access network to the given access terminal in the secondary sector.

10. The method of claim 9, further comprising:

in response to the second determination being positive, making a third determination at the access network of whether at least one timeslot is available for use in the tertiary sector to carry data to the given access terminal sooner than the any timeslot available in the secondary sector; and

in response at least to the third determination being positive, scheduling the at least one timeslot for use to transmit data from the given access network to the access terminal in the tertiary sector.

11. The method of claim 10, wherein the data transmission request comprises an expanded Data Rate Control (DRC) request and further specifies a primary DRC code for the primary sector, a secondary DRC code for the secondary sector, and a tertiary DRC for the tertiary sector.