3gpp tr ab cde

GERAN and GPRS related items

1. Positioning Enhancements for GERAN

Summary based on the input provided by Ericsson LM in RP-170920.

721003	Positioning Enhancements for GERAN	ePOS_GERAN	1	R6	RP-161260
721103	Core part: Positioning Enhancements for GERAN	ePOS_GERAN-Core	2	R6	RP-161260
721203	Perf. part: Positioning Enhancements for GERAN	ePOS_GERAN-Perf	2	R6	RP-161260

Positioning Enhancements for GERAN introduces means for an improved ability to estimate the position of a mobile station operating in normal GSM as well as in EC-GSM-IoT coverage without using satellite positioning such as GPS, GLONASS, Beidu or Galileo. This is achieved by introducing a new base station centric Multilateration Timing Advance procedure and a new mobile station centric Multilateration Observed Time Difference procedure. The Multilateration Timing Advance procedure enable positioning as accurate as 50 m in 67% of the positioning attempts when using only three base stations (see R6-160235, "Enhanced Positioning – Positioning performance evaluation", Source Ericsson LM).

Multilateration Timing Advance Procedure

This positioning procedure is based on one or more base stations acquiring timing advance information from a set of cells selected by the mobile station (corresponding to a set of distances to each cell). The position of the device is then determined using so called multilateration where the position of the mobile station correspond intersection of three or more arcs, see Figure 1.



Figure 11.2.1-1: Illustration of Multilateration Timing Advance Procedure

Multilateration Observed Time Difference Procedure

This positioning procedure is based on the same multilateration principles as the Multilateration Timing Advance procedure with a difference that in the neighbour cells the distance to the bases stations instead are based on so called observed time difference measurements made by the mobile station.

2. New GPRS algorithms for EASE

Summary based on the input from Vodafone in SP-170759.

710085

New GPRS algorithms for EASE

EASE_ALGOs_SA3

1

S3

SP-160203

This WI delivered 6 new TS's adding 2 new strong algorithms (GIA4 and GEA5/GIA5) for cyphering and integrity protection of GSM CIoT data, each algorithm having an algorithm specification, an implementer's test specification and a conformance specification.

This work item delivered the following:

- TS 55.241 [1] – The design specification for GIA4 which is an integrity protection algorithm intended for use with GSM based on KASUMI [2].

- TS 55.242 [3] – The implementer's test data specification for GIA4 integrity protection algorithm specified in TS 55.241 [1].

- TS 55.243 [4] – The conformance test data specification for GIA4 integrity protection algorithm specified in TS 55.241 [1].

- TS 55.251 [5] – The design specification for GEA5 (cyphering algorithm) and GIA5 (integrity protection algorithm) intended for use with GSM based on SNOW 3G.

- TS 55.252 [6] – The implementer's test data specification for GIA4 integrity protection algorithm specified in TS 55.251 [5].

- TS 55.253 [7] – The conformance test data specification for GIA4 integrity protection algorithm specified in TS 55.251 [5].

These algorithms can be selected by GSM terminals and networks using the current algorithm selection mechanisms.

Each Algorithm has a trio of documents: a design specification detailing how the algorithm works, an implementer's test specification that has test values for both the final calculations and the intermediate steps to allow implementers to prove their developments and a conformance test specification for final testing by the developers or by a third party,

Due to the security nature of these specifications and the strength of the algorithms, these specs are only issued under licence from 3GPP.

References

[1] TS 55.241: "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Specification of the GIA4 integrity algorithm for GPRS; GIA4 specification".

[2] TS 35.202: "3G Security; Specification of the 3GPP Confidentiality and Integrity Algorithms; Document 2: KASUMI Specification".

[3] TS 55.242: "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Specification of the GIA4 integrity algorithm for GPRS; Implementers' test data".

[4] TS 55.243: "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Specification of the GIA4 integrity algorithm for GPRS; Design conformance test data".

[5] TS 55.251: "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Specification of the GEA5 encryption and GIA5 integrity algorithms for GPRS; GEA5 and GIA4 algorithm specification".

[6] TS 55.252: "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Specification of the GEA5 encryption and GIA5 integrity algorithms for GPRS; Implementers' test data".

[7] TS 55.253: "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Specification of the GEA5 encryption and GIA5 integrity algorithms for GPRS; Design conformance test data".

3. Positioning Enhancements for GERAN

4. Other GERAN items

See DECOR_GERAN

3.