04-08-2012, 10:34 AM
Technical Specification Group GSM/EDGE Radio Access Network
[attachment=30147]
Introduction
GERAN is a result of over a decade of radio interface evolution that is still ongoing. While GERAN is or is being
deployed worldwide also in emerging markets, evolving further the GERAN radio interface needs to be studied to
ensure not only that the same services are available regardless of the underlying radio technology UTRAN or GERAN,
but essentially that service continuity exists across these radio technologies supported by core network evolution
e.g. IMS. Such an evolution is also needed to maintain GERAN competitiveness as well as UTRAN competitiveness.
General
The general objective of this study is to improve the service performance and to provide efficient bearers for GERAN to
meet enhanced demands for different types of services. Some examples of services considered are given below.
Interactive and Best-effort services (like web browsing, file download and image or video clip upload) typically
gain from increased mean bit rates, but also gain from reduced latency, e.g. throughput is limited by the TCP
window size divided by the round trip time.
Conversational services (like Voice over IP (VoIP) and enhanced Push to talk over Cellular (PoC)), as well as,
e.g. on-line gaming services typically have high requirements on latency and fast access.
All services may gain from improved coverage, e.g. video-telephony is a service that will need (better) coverage
for higher bit rates for both uplink and downlink.
All services may gain from a mobile station always being connected to the most appropriate base station, i.e. as
seen from a radio performance perspective, as this may yield higher capacity, reduce latency etc. due to
improved interference conditions.
Particular requirements may be set by services like broadcast TV over MBMS bearers. Typically, high bit rates
are required at the same time as robustness is important to fulfil coverage and latency requirements as well as
providing interactivity.
Conclusions and recommendations
Within a relatively short period of time a significant number of proposals has been put forward to determine the next
steps on future GERAN evolution. The general viability of proposals can be determined by comparing how those fit
with the given objectives in chapter 4, which are summarised in table 1. Conclusions and recommendations for
downlink, uplink and latency enhancements are summarised in subclauses 5.1, 5.2 and 5.3 respectively.
Numbers in the table refer to the related chapter of the feasibility study. Some proposals are combined to achieve better
performance. Some performance objectives like "balanced performance improvements" are considered as general
objectives, thus not included in the table. Downlink and uplink performance objectives are separated, since most of the
proposals are meant only for one link.
Table 1 should be seen as giving the current status for each proposal and is subject to change with each forthcoming
meeting.
[attachment=30147]
Introduction
GERAN is a result of over a decade of radio interface evolution that is still ongoing. While GERAN is or is being
deployed worldwide also in emerging markets, evolving further the GERAN radio interface needs to be studied to
ensure not only that the same services are available regardless of the underlying radio technology UTRAN or GERAN,
but essentially that service continuity exists across these radio technologies supported by core network evolution
e.g. IMS. Such an evolution is also needed to maintain GERAN competitiveness as well as UTRAN competitiveness.
General
The general objective of this study is to improve the service performance and to provide efficient bearers for GERAN to
meet enhanced demands for different types of services. Some examples of services considered are given below.
Interactive and Best-effort services (like web browsing, file download and image or video clip upload) typically
gain from increased mean bit rates, but also gain from reduced latency, e.g. throughput is limited by the TCP
window size divided by the round trip time.
Conversational services (like Voice over IP (VoIP) and enhanced Push to talk over Cellular (PoC)), as well as,
e.g. on-line gaming services typically have high requirements on latency and fast access.
All services may gain from improved coverage, e.g. video-telephony is a service that will need (better) coverage
for higher bit rates for both uplink and downlink.
All services may gain from a mobile station always being connected to the most appropriate base station, i.e. as
seen from a radio performance perspective, as this may yield higher capacity, reduce latency etc. due to
improved interference conditions.
Particular requirements may be set by services like broadcast TV over MBMS bearers. Typically, high bit rates
are required at the same time as robustness is important to fulfil coverage and latency requirements as well as
providing interactivity.
Conclusions and recommendations
Within a relatively short period of time a significant number of proposals has been put forward to determine the next
steps on future GERAN evolution. The general viability of proposals can be determined by comparing how those fit
with the given objectives in chapter 4, which are summarised in table 1. Conclusions and recommendations for
downlink, uplink and latency enhancements are summarised in subclauses 5.1, 5.2 and 5.3 respectively.
Numbers in the table refer to the related chapter of the feasibility study. Some proposals are combined to achieve better
performance. Some performance objectives like "balanced performance improvements" are considered as general
objectives, thus not included in the table. Downlink and uplink performance objectives are separated, since most of the
proposals are meant only for one link.
Table 1 should be seen as giving the current status for each proposal and is subject to change with each forthcoming
meeting.