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This completes the discussion on basic priciples involved behind LTE allocation mechanism. We will close the article with a bit about "Scheduling".
In this article, we only discussed about how a allocation mechanism works through PHY/MAC. Behind this allocation mechanism, there exist two levels of scheduler: one at RRM level which work on top level abstraction of EPS bearers and second one at MAC level which works at radio transport level with a granularity of 1 ms TTI.
For downlink, scheduling function located at eNode B MAC works based on limits set by EPS bearer, channel conditions, RLC DL buffer, load etc.
For uplink, though UE MAC does logical channel prioritisation, scheduling function is located at eNode B. It works similar to DL scheduler except buffer status reports and scheduling requests comes from UE and channel quality is gauged by eNode B.
RAR
RNTI
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Random Access Response
Radio Network Temporary Identifier
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[1] 3GPP TS 36.213, Rel 8 "PHY procedures"
[2] 3GPP TS 36.211, Rel 8 "PHY channels and Modulation"
[3] 3GPP TS 36.212, Rel 8 "PHY Multiplexing and Channel coding"
[4] 3GPP TS 36.321, Rel 8 "MAC"
[5] 3GPP TS 36.331, Rel 8 "RRC"
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