name: ODMA
full_form: Opportunity Driven Multiple Access
context: With ATM transport, there are two possibilities for establishing the direct bearer between the Node B and the SRNC: VC switching and AAL2 switching. Full direct bearer connectivity between SRNC and Node-B based on VC switching, requires the establishment of a permanent virtual path between each Node B and each RNC (full mesh). An example is shown in figure x.x. Figure 8: Direct SRNC- Node-B Transport Bearer: VC switching Having a full meshed VC network multiplies by several times the number of virtual channels needed between the RNC and the ATM Switch, making this solution impractical, and the network configuration more complex. For example, for an RNC (1) with 300 Nodes B and an RNC (2) with 200 Nodes B: RNC (1) needs 500 virtual channels (160% of the previous connections) RNC (2) needs 500 virtual channels (250% of the previous connections) Figure 9: Direct SRNC- Node-B Transport Bearer: AAL2 switching An example of full direct bearer connectivity between SRNC and Node-B based on
description: Opportunity Driven Multiple Access (ODMA) is a technology used in UMTS-TDD mode to manage multiple access and relay transmissions. It operates within the constraints of the guard period (GP) available within a slot, which allows for relatively short distances between ODMA nodes. ODMA does not impose additional guard period or frame synchronization requirements over standard TDD, and its inclusion could potentially relax the guard period requirements of a TDD system.
explanation: ODMA is classified as a Technology because it is a method or system used to manage multiple access and relay transmissions within the UMTS-TDD mode. The description details its functionality and impact on system performance.
section_title: 4.7.1	TDD Guard Period Requirements
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