MAC Services and Functions mapping phy ch DCH Coding and multiplexing mapping phy ch DCH Coding and multiplexing set-up, release of logical channels d
{"Image DocumentName": "MAC Services and Functions", "Image ImageDescription": "set-up, release of logical channels. data transfer service on logical channels. allocation/re-allocation of radio resources. measurement report. Functions. mapping. phy ch. DCH. Coding and. multiplexing. mapping. phy ch. DCH. Coding and. multiplexing. Selection of the transport format. Handling of priority within one user/between users. Scheduling of control messages (broadcast, paging, notification) Multiplexing/de-multiplexing of higher layers PDUs. on/from common or dedicated transport channels. Contention control on the random access channel. The MAC layer manages the mapping of the logical channels to the transport channels by controlling the mapping/multiplexing mechanisms previously introduced. The transport format is chosen within the set of available transport formats. Priorities are handled by choosing the appropriate transport formats; for instance, data with high priority can use an high bit rate format; the same solution can be adopted for data which have accumulated a high delay in the upper layer queues. On the down link, still the transport formats can be used to fulfil different priority requirements arising between different users. Most of the functions listed in the figure may require an exchange of signalling information between MAC layers belonging to MS and the relevant end point in the access network. Contention control is related to the collision event that may arise on the random access channel (the contention is detected by Layer 1 and possibly resolved by Layer 3).", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}