17 Geran Features

17.1 Geran support for geran - 3g Long Term Evolution interworking (gelte) uid_50583

Resources: GP,G1,C1,G3new

UID	Name	Resource	Hyperlink	Notes	TS_TR
50583	GERAN support for GERAN - 3G Long Term Evolution interworking	-	GP-061757	-	44.018, 44.060, 45.002, 45.008, 45.010, 48.008, 48.018, 51.010
51583	G1 part	G1	GP-061757	GP#41 completed	43.055, 43.129, 43.246, 45.002, 45.008, 45.010
52583	G2 part	G2	GP-061757	GP#41 completed	44.018, 44.060, 48.008, 48.018
53583	CT1 part	C1	GP-061757	-	24.008
54583	Testing	G3new	GP-061757	GP#52 completed	51.010

Supporting Individual Members: Alcatel, Cingular, Ericsson, Huawei, KPN, LG Electronics, Motorola, Nokia, Nortel Networks, Qualcomm, Research In Motion, Siemens, Telecom Italia, TeliaSonera, T-Mobile.

This work is linked to "3G Long term Evolution" UID_25029 and "System Architecture Evolution" UID_320005.

3GPP approved the above WIs for the evolution of 3GPP radio-access technology towards high-data-rate, low-latency and packet-optimized. Requirements for interworking with GERAN networks are captured in RAN TR 25.913 (Requirements for E-UTRA and E-UTRAN) the relevant being:

Co-existence and interworking with 3GPP RATs

The following requirements are applicable to inter-working between E-UTRA and other 3GPP systems:

1. E-UTRAN Terminals supporting also UTRAN and/or GERAN operation should be able to support measurement of, and handover from and to, both 3GPP UTRA and 3GPP GERAN systems correspondingly with acceptable impact on terminal complexity and network performance.

2. E-UTRAN is required to efficiently support inter-RAT measurements with acceptable impact on terminal complexity and network performance, by e.g. providing UE's with measurement opportunities through downlink and uplink scheduling.

3. Interruption time during handover of real-time services between E-UTRAN and UTRAN is less than 300 ms

4. Interruption time during handover of non real-time services between E-UTRAN and UTRAN should be less than 500 ms

5. Interruption time during handover of real-time services between E-UTRAN and GERAN is less than 300 msec

6. Interruption time during handover of non real-time services between E-UTRAN and GERAN should be less than 500 ms

7. Non-active terminals (such as one being in Rel-6 idle mode or CELL_PCH) which support UTRAN and/or GERAN in addition to E-UTRAN shall not need to monitor paging messages only from one of GERAN, UTRA or E-UTRA

8. Interruption time during handover between an E-UTRA broadcast stream and a UTRAN unicast stream providing the same service (e.g. same TV channel) is less than FFS. (Value to be agreed following SA guidance)

9. Interruption time during handover between an E-UTRA broadcast stream and a GERAN unicast stream providing the same service (e.g. same TV channel) is less than FFS. (Value to be agreed following SA guidance)

10. Interruption time during handover between an E-UTRA broadcast stream and a UTRAN broadcast stream providing the same service (e.g. same TV channel) is less than FFS. (Value to be agreed following SA guidance)

The above requirements apply where the GERAN and/or UTRAN networks provide support for E-UTRAN handover.

Reduction in network and terminal complexity and cost by not mandating support for the measurements and handovers to/from GERAN/UTRAN should be considered.

The interruption times above are to be considered as maximum values. These values may be revisited when the overall architecture and the E-UTRA physical layer has been defined in more detail.

This work adds functionality to the GERAN specifications to meet the above requirements. This includes changes to:

• (P)BCCH System Information

• MS capabilities

• Packet Switched handover

• Session continuity

• InterRAT NACC

• MBMS

• Idle Mode measurements and cell (re)selection;

• Connected and GPRS mode MS measurements on LTE, and measurement reporting;

• MS timing aspects of interRAT change.

Based on experience in network deployment

• changes are performed for A/Gb mode only