Distributed and Prioritized Scheduling to implement Spectrum Aggregation

Basics:

LTE-Advanced should support multi-carrier with non-contiguous, asymmetric and cross band-class operations to ensure full flexibility of the spectral deployment. when the component carriers in different frequency bands are aggregated into a wider bandwidth, LTE-Advanced UE can share the overall wider bandwidth. Each user can use RBs of all the component carriers simultaneously.

Current Scheduling schemes1. Disjoint Queue Scheduler (DQS)2. Joint Queue Scheduler (JQS)

Proposed:JQS with Priority Identifier

Priority Criteria (which make this priority feature unique)Priority of buffers mapping to resource block of specific component carrier priorities based upon following.

•Threshold of buffer status  e.g Buffer status is more than 70% and expected buffer fill time is t1 •Application lifeHow long this application (for which buffer – RB mapping) runningIf it is long and its temporary suspension would not effect on application (user experience)e.g. If a browser application is running and its temporary suspension (or delay) would not effect overall user experience
•Expected time to complete applicationHow much time require to complete new and running applicatione.g. If a browser application is running for long and new application is an SMS/MMS, which will take relatively very small time to complete.

Unique & Innovative in Proposed Scheduling scheme This scheduler is optimised JQS which has a priority analyser. It will read priority information from the buffered items and pass it to scheduler.

How it optimized•To fetch the priority information from buffered traffic from each user.
•User 1 may have more than one traffic items at a time. Each item must have priority information. Priority analyser fetch the priority information
•There can be more than one user at a time, which has to traffic their data. To define the priority among the users & their tariff priority analyser will analyse following.
•User with largest bandwidth requirement will have priority

Benefits•Overall performance improvement (optimised scheduling)
•Reduce average error
•Reduce latency (less wait)

Note:  This algorithm hasn’t proposed earlier to Spectrum aggregation or Carrier Aggregation.