RTT Technology Topics - 2002
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RTT Technology Topics
Every month we produce a technology topic that reflects current
RTT research. These are sent to an elective list of engineering,
marketing and business team leaders.
There are over 120 Topics archived on this site starting from
August 1998.
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| 2002 | Title | Synopsis |
|---|---|---|
| December | Session Power budgets | Power consumption and battery capacity constraints limit uplink and downlink traffic value.Revenues in 2G networks are based on the fact that users can chat on their phones for hours at a time (the session persistency metric). To be fiscally successful, 3G networks will need to deliver similar user functionality |
| November | SIP and Session Management | As session complexity increases, signaling overhead increases which in turn increases the cost of delivery. This doesn't matter as long as we achieve a session tariff premium, which is greater than the additional costs incurred. At present there is no consistent way of describing the cost of delivery of a complex two user or multi user packet driven session. Without knowing session cost, we cannot calculate session margin. This suggests the need for an extension of existing session initiation protocols to embrace session management and cost and margin management. |
| October | IT QOS | How an information (IT) network can be measured in terms of the end to end user to user or multi user to user or user to multi user or multi user to multi user experience. Users may also be devices which implies a need to measure the response time of device to device or multi device to multi device exchanges. |
| September | Storage persistency | Immediacy, consistency, complexity and persistency as components of storage value. |
| August | Consistency as a quality metric | Consistency is arguably the most under-rated metric in present IP network performance planning. The addition of the radio physical layer adds to the problem. Consistency will also become increasingly important as content becomes more complex over time. |
| July | 3G compatibility and performance | The compatibility and performance issues implicit in the 2G to 3G transition and the related test and measurement requirements for handset hardware and software and network hardware and software. |
| June | The circuit switch to session switch transition | The merits/demerits of circuit switching, the advantages and disadvantages of packet transmission, the possible future transition to session switching. Possible implications for billing including the longer term transition to quality rather than quantity based billing as a mechanism for realizing 'session value'. |
| May | Modulation and Multiplexing - the 3G to 4G transition | The disadvantage of OFDM is that it requires a relatively complex FFT to be performed in the encoder and decoder. In digital TV, the power budget overheads associated with the complex transform do not matter (in the context of transmitters producing kilowatts of RF power and receivers attached to a 240 volt supply).Present implementation of an OFDM transceiver in a 3G cellular handset would however not be economic in terms of processor and power budget overhead. OFDM is however, a legitimate longer term (4G) option providing a bandwidth efficient robust way of multiplexing multiple users across 10, 15 or 20 MHz of contiguous bandwidth. It also provides the basis for converging the 3G TV and cellular radio network bandwidth proposition. |
| April | Channel Coding - the 2G to 3G transition | Baseband processing gain is a summation of source coding gain channel coding gain (block codes, convolutional coding and long code correlation) and modulation and multiplexing gain Handset resident processor and memory budgets become directly tradable against radio bandwidth efficiency and are a key ingredient for 3G bandwidth quality. |
| March | Source coding | Source coding has evolved as part of the 2G to 3G digital cellular transition to embrace object coding and mesh coding techniques. These techniques involve a substantial increase in decoder (handset resident) memory and processor power. The optimization of mesh coding will be a key performance differentiator in next generation handset design. At network level, source coding will directly influence traffic properties and offered traffic distribution and will need to be considered as an integral part of the network planning process. |
| February | Declarative applications | How the application layer can perform 'network discovery', how 'network discovery' potentially works better than the more generally assumed practice of 'device discovery' (where the network sets out to discover the target device hardware and software form factor prior to sending a file). The inter-relationship of 'declarative content' and 'declarative applications'. |
| January | 3 G software | How 3G handset software changes user behavior and user expectations. |