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Buffer occupancy used in uplink scheduling for a communication device
| Details |
Inventors: Kuchibhotla, Ravi; Love, Robert T.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Gary; Erika A.
Assistant Examiner: Nguyen; Huy D.
Attorney, Agent or Firm: Bowler, II; Roland K., Mancini; Brian M.
A method for using buffer occupancy in uplink scheduling for a communication device includes a first step of sending buffer occupancy information and a time stamp indicating a last transmission opportunity provided to the communication device to an active set base stations. A next step includes utilizing the buffer occupancy information and time stamp to adjust a scheduling fairness setting for the communication device. A next step includes receiving scheduling information from a scheduler in accordance with the scheduling fairness setting. A next step includes transmitting on an uplink channel in accordance with the scheduling information. |
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DETAILED DESCRIPTION OF THE INVENTION The present invention provides novel techniques to ensure that BTSs receive reliable buffer occupancy information, such that a macro selection diversity benefit is obtained.
In one aspect of the present invention, time-stamping of the last transmission opportunity along with buffer occupancy is reported so that BTSs have the latest information that can assist it in ensuring a higher degree of fairness.
Another aspect of the present invention provides the last known transmission opportunity to the BTS when first added to the active set of the mobile, since it is likely that this BTS may schedule the mobile early on, to help it initialize its fairness setting.
Another aspect of the present invention transmits a buffer occupancy report when the mobile determines that a BTS has exceed a certain predetermined uplink channel quality and is therefore most likely to schedule the mobile.
Additional information such as persistence of fading, speed, distance from BTS, etc.
, could be sent or, alternatively, the threshold level could be based on persistence of fading, speed, etc.
Another aspect of the present invention indicates the rate of buffer increase to help differentiate applications and make appropriate scheduling decisions and assisting with flow control at the mobile.
The indication of the last transmission opportunity by the mobile assists the non-scheduling and non-receiving BTSs to improve the fairness of scheduling.
In addition, new BTSs added to the active set are instantly made aware of the transmission opportunities since they are most likely to schedule depending on the algorithm used to add BTSs in SHO and need to have their fairness initialized with the new mobile being served.
Moreover, the unsolicited scheduling information is a very rapid trigger to the BTSs that assist in not only ensuring fairness but also ensuring that the latest information is at the BTSs so that a scheduling BTS can choose the most optimal assignment parameters (number of subframes, coding, etc
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