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Load dependent Multi stage distributed admission control

IP.com Disclosure Number: IPCOM000147397D
Published in the IP.com Journal: Volume 7 Issue 3B (2007-04-10)
Included in the Prior Art Database: 2007-Apr-10
Document File: 3 page(s) / 327K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

In future mobile radio networks the bottleneck may not any longer be the air-interface or radio access network (RAN), respectively, but also the core network. Hence, a successful admission in one part of the network (RAN or core network) can result in congestion in the other part (core network or RAN, respectively).To guarantee Quality of Service (QoS) respective admission control (AC) mechanisms need to be deployed. At present, the AC function for mobile networks is located in one entity only due to the assumption that the bottleneck in such kind of mobile communication systems is the air-interface and the core network is dimensioned appropriately so that all traffic can be transmitted without congestion. Therefore, a novel solution to the problem mentioned above is presented in the following. A load dependent multi-stage distributed AC can be performed. The AC is developed jointly by all involved entities and the sequence of decision polling is dependent on the load, i.e. the ranking of the intermediate decisions is dynamic. The distributed decision is controlled by passing tokens between the involved entities to which flags are assigned, e.g. red, yellow, and green Flags.

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Load dependent Multi stage distributed admission control

Idea: Dr. Jijun Juo, DE-Munich; Ruediger Halfmann, DE-Munich; Matthias Lott, DE-Munich

In future mobile radio networks the bottleneck may not any longer be the air-interface or radio access network (RAN), respectively, but also the core network. Hence, a successful admission in one part of the network (RAN or core network) can result in congestion in the other part (core network or RAN, respectively).To guarantee Quality of Service (QoS) respective admission control (AC) mechanisms need to be deployed.

At present, the AC function for mobile networks is located in one entity only due to the assumption that the bottleneck in such kind of mobile communication systems is the air-interface and the core network is dimensioned appropriately so that all traffic can be transmitted without congestion.

Therefore, a novel solution to the problem mentioned above is presented in the following. A load dependent multi-stage distributed AC can be performed. The AC is developed jointly by all involved entities and the sequence of decision polling is dependent on the load, i.e. the ranking of the intermediate decisions is dynamic. The distributed decision is controlled by passing tokens between the involved entities to which flags are assigned, e.g. red, yellow, and green Flags.

The token is assigned to the most critical instance (e.g. capacity) according to the service requested,
i.e. the assignment is context sensitive. Thus, for a high rate data service (high FTP - File Transfer Protocol) a different token will be assigned to a different entity than it is the case for voice like services. Also, different tokens can be assigned to different entities for Uplink and Downlink (UL/DL) transmissions. A default token can be set. If the load and capacity in the system change, the default token can be reallocated to the most critical entity according to the principles described above.

The entity holding the token then decides if the requested service can be transmitted. If the capacity available is sufficient for the requested service, the entity sends a green Flag and the next entity in line checks if the service can be provided according to the capacity available, i.e. AC is not done immediately when a green Flag is received, but the subsequent situation is checked first. If a green Flag is issued throughout the required entities, the service is admitted. If a red Flag is issued anywhere in line, the admission will be rejected. The yellow Flag is a soft-flag concept for relay enhanced cells, i.e. when relay nodes (RNs) are used for extending the coverage of a Base Station (BS). The yellow Flag repartitions such shared resources.

Alternatively, scalable QoS may be provided, so that a call is not rejected immediately if a red flag is issued. To this end, temporarily a lower rate c...