1、 TIA/EIA INTERIM STANDARD A Position Determination Standard for Analog Systems TIA/EIA/IS-817 JANUARY 2001 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Indushy Association represents the communications secior of Elsctronit: industries Alliance NOTICE TIA/EIA Engineering Standards a
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6、andard, Interim Standard, or TSB, no position is taken with respect to the validi of those claims or of any patent rights in connection therewith. The patent holde+) so far identijed have, however, jled statements of willingness to grant licenses under those rights on reasonable and nondiscriminato
7、y terms and conditions to applicants desiring to obtain such licenses. Details may be obtained from the standards developer. TIA/EIA INTERIM STANDARDS TIA/EIA Interim Standards contain information deemed to be of technical value to the industry, and are published at the request of the originating Co
8、mmittee without necessarily following the rigorous public review and resolution of comments which is a procedural part of the development of a TIA/EIA Standard. TIA/EIA Interim Standards should be reviewed on an annual basis by the formulating Committee and a decision made on whether to proceed to d
9、evelop a TIA/EIA Standard on this subject. TIA/EIA Interim Standards must be cancelled by the Committee and removed from the TIA/EIA Standards Catalog before the end of their third year of existence. Publication of this TIA/EIA Interim Standard for trial use and comment has been approved by the Tele
10、communications Industry Association. Distribution of this TIA/EIA Interim Standard for comment shall not continue beyond 36 months from the date of publication. It is expected that following this 36 month period, this TIA/EIA Interim Standard, revised as necessary, will be submitted to the American
11、National Standards Institute for approval as an American National Standard. Suggestions for revision should be directed to: Standards that a certain course of action is preferred, but not necessarily required; or (in negative form) that a certain possibility or course of action is discouraged, but n
12、ot prohibited. “May” and “may not” indicate a course of action permissible within the limits of this standard. “Can” and “cannot” are used for statements of possibility and capability, whether material, physical or causal. Those wishing to deploy position determining systems in the United States sho
13、uld also take notice of the requirement to be compliant with Federal Communications Commission (FCC) Rulings on 9 1 1 Emergency Services (see Informative Reference 5). “Base station” refers to a number of functions performed on the land side, which are typically distributed among a Base Station Tran
14、sceiver (BTS), a Base Station Controller (BSC), a Mobile Switching Center (MSC) and any Inter-Working Function (IWF) required for network connection. These elements are grouped together, because there is no need to distinguish them in this air interface standard; see Informative Reference 6. By cont
15、rast, “Position Determination Entity” (PDE) refers to the entity in the land network that fulfills a request to locate a mobile station. The interconnection between base station and PDE is not specified in this document; however, for networks that wish to be compliant with J-STD-036, the details are
16、 discussed in Informative Reference 4 in Section 1.3. Footnotes appear at various points in this standard to elaborate and to further clarify items. Unless indicated otherwise, this document presents numbers in decimal form. Binary numbers are distinguished in the text by the use of single quotation
17、 marks. ii TIA/EIA/IS-817 CONTENTS i 1 . GENERAL 1 2 1.1. Scope 1 3 1.2. Definitions . 1 4 1.3. References . 4 5 1.3.1. Normative . 4 6 1.3.2. Informative . 4 7 1.4. Logical Information “Blocks“ . 4 8 1.5. Communication of Mobile Station Geolocation Capabilities . 6 9 2 . REQUIREMENTS FOR POSITION D
18、ETERMINATION SERVICES 7 Forward and Reverse Voice Channel Message Pairs 7 10 2.1. 11 2.2. PDE - Mobile Procedures 8 12 2.2.1. Mobile Station Procedures . 8 13 14 15 16 17 18 19 20 21 22 2.2.2. PDE Procedures 10 Initiating and completing a GPS location fix . 10 Acquisition Assistance Part 1 - Respons
19、e message 11 Acquisition Assistance Part 2 - Response message 12 Responding to a request for Navigation Bits Assistance 12 Responding to a request for Additional Navigation Bits Assistance 13 Responding to a request for Additional Location Assistance 14 Requesting the results of a GPS measurement .
20、14 2.2.2.1. 2.2.2.2. Responding to requests for additional assistance after the GPS 2.2.2.3. Responding to a request for Location Assistance after the GPS 2.2.2.4. 2.2.2.5. 2.2.2.6. 2.2.2.7. 23 24 2.2.2.7.1. Requesting computed location results 14 2.2.2.7.2. Requesting GPS measurement . 14 25 2.3. P
21、DE - Mobile Messages 15 26 2.3.1. Mobile to PDE Messages 15 Information Block Type I - Acquisition Assistance 15 Information Block Type II - Location Assistance . 19 Information Block Type III - Navigation Message Bits . 19 30 2.3.1.4. GPS Measurement Report 21 31 2.3.1.5. Calculated Position Report
22、 . 24 32 2.3.2. PDE to Mobile Messages 27 Information Block Type I - Acquisition Assistance 27 27 28 29 2.3.1.1. 2.3.1.2. 2.3.1.3. 33 2.3.2.1. iii 1 2 3 4 8 TIA/EIA/IS-817 CONTENTS 2.3.2.2. 2.3.2.3. 2.3.2.4. 2.3.2.5. Information Block Type II - Location Assistance . 31 Information Block Type III - N
23、avigation Message Bits . 34 GPS Measurement Report - Request 36 Calculated Position Report - Request . 36 2.4. Supplements to TIA/EIA-553-A to Support Analog Position Determination Senrices . 36 3 . OPTIONAL CAPABILITIES FOR POSITION DETERMINATION SERVICES 43 ANNEXA . FLOW DIAGRAM OF PDE PROCEDURES
24、(2.2.2) . 44 iv 1 2 3 4 5 6 7 8 9 10 11 12 TIA/EIA/IS-817 TABLES Table 1.4- 1 . Types of information “blocks” exchanged between PDE and mobile . 5 Table 2.1- 1 . Message Pairs Exchanged Between PDE and Mobile Station . 8 Table 2.3.1.1-1. Request for Additional Assistance 16 Table 2.3.1.3- 1 . Mappin
25、g Table on Satellite Order for SV-MAP 20 Table 2.3.1.4-2. Time Reference Source . 24 Table 2.3.1.5-1. TIME-REF-SRC . 25 Table 2.3.1.5-2. Position Uncertainty . 27 Table 2.3.2.1-2. Time of Applicability Offset 29 Table 2.3.2.2- 1 . TOAR-CORR Segmentation 33 Table 2.3.1.1-2. Mobile Station Response Ty
26、pe 16 Table 2.3.1.4-1. Error Code 23 Table 2.3.2.1-1. TIMING-SRC . 29 V TIAEIADS-8 17 vi TIA/EIA/IS-817 1 2 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 1. GENERAL 1.1. Scope This document provides procedures, signaling and messages used in addition to TIA/EI
27、A-553-A as one possible way to support E-911 Position Determination services. It defines the order messages sent by the base station and the order confirmation messages sent by the mobile station, together with mobile station and base station procedures for Position Determination services when opera
28、ting in analog mode. The existing transport protocol in TIA/EIA-553-A is used to transport the position determination data messages. This document also defines the messages exchanged between the mobile station and the Position Determination Entity (PDE), together with mobile station and PDE procedur
29、es for a method of Position Determination services when operating in analog mode. The following goals were used in developing this document: Follow the existing order/order confirmation message structure and mobile station and base station procedures in TIA/EIA-553-A, hence limiting the required mod
30、ifications to analog base stations to support Position Determination services as required by E-91 1; Minimize message size to keep the mute time to a minimum; Provide messages that support both autonomous and wireless-assisted GPS location services. 1.2. Definitions Acquisition Assistance. receiver
31、in acquiring (detecting) signals from the GPS satellites. Angle of Axis for Position Uncertainty. Position uncertainty is represented as a 1-0 (one standard deviation) ellipse. This angle is the angle of one of the ellipses axes with respect to True North. Information about the GPS system/signals th
32、at aids the GPS Assistance Data. various purposes (e.g., acquisition, location calculation or sensitivity improvement). Autonomous Mobile Station. A mobile station that is capable of detecting a navigation signal without any assistance. The mobile station may be capable of autonomously calculating i
33、ts own position. Azimuth. An angle that specifies a direction in the horizontal plane, expressed in degrees measured clockwise from True North. Base Station. This term refers to a number of functions performed on the land side, which are typically distributed between a Base Station Transceiver (BTS)
34、, a Base Station Controller (BSC), a Mobile Switching Center (MSC) and any Inter-Working Function (IWF) required for network connection. See also the definition of Position Determination Entity (PDE) below. The assistance data provided by the PDE to the mobile station for 1 TIA/EIA/IS-817 5 6 7 8 9
35、10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Chip. The interval defined by the chipping (spreading) rate of the GPS C/A code (1023 kHz). Stated as a time interval, one chip equals approximately 977.5 ns; as a distance it is approximately 293.0 m. In this doc
36、ument, the exact value depends on the instantaneous Doppler shift experienced by the satellite signal. Code Chip. See Chip. Code Period. One repetition of a periodic digital code. It is used in this document to refer to a repetition of the PN code used by a GPS satellite, which is 1023 chips long. C
37、ode Phase. The number (not necessarily integer) of code chips that have elapsed since the beginning of a code repetition. Doppler n* Order. The n” order moment speciing a satellites observed Doppler. ECEF. “Earth-Centered-Earth-Fixed”. A frame of reference for speciing positions that is centered in
38、the center of the Earth and rotates with it. Elevation Angle. The angle between a (GPS) satellite and the horizon, expressed in degrees. Ephemeris. The predictions of current satellite positions transmitted by the GPS satellites (among other information) in the Navigation Message Bits. Fix. The proc
39、ess of performing position determination. FOCC. Forward Control Channel. Forward Control Channel (FOCC). A control channel used from a base station to a mobile station. Forward Link. The communication path from the PDE to the mobile station. Forward Voice Channel (FVC). A voice channel used from a b
40、ase station to a mobile station. FVC. Forward Voice Channel. Geolocation. The process of determining a geographic location. GPS. Global Positioning System. A DOD conceived, implemented and operated constellation of 24 satellites orbiting the Earth at a nominal altitude of about 11,000 miles. The sat
41、ellites transmit a set of radio signals expressly structured to enable a suitably-designed receiver to determine its own position. JWF. Interworking Function. A network entity enabling interactions between network elements, such as interactions between an MSC and a landline function. The IWF usually
42、 performs protocol conversions as its primary function. Location. The terms “location” and “position” are used interchangeably throughout this document. In this respect, the definition of the term differs from the historic use of location in wireless systems to identi the mobiles current serving sys
43、tem. See Position. Location Assistance. Information about the GPS system/signals that enables the mobile to compute its own location based on the GPS measurements. LSB. Least Significant Bit. 2 TIA/EIA/IS-817 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 3
44、4 35 36 Mobile Station. A station that communicates with the base station. Mobile Switching Center (MSC). radio-telephone service. Also called the Mobile Telephone Switching Office (MTSO). ms. Millisecond (1 O-3 second). MSB. Most Significant Bit. MSC. See Mobile Switching Center. Navigation Bits As
45、sistance. receivers ability to detect the GPS signal. It is also useful for time synchronization. Navigation Message Bits. The message bits (50 bits per second) transmitted by GPS satellites, containing the satellite clock, ephemeris, almanac and other parameters. ns. Nanosecond (1 O-9 second). A co
46、nfiguration of equipment that provides cellular Information about the GPS signals that improves the GPS PDE. See Position Determination Entity. Position. The geographic position of the mobile station expressed in latitude and longitude. Position Determination Entity (PDE). A network entity which man
47、ages the position or geographic location determination of the mobile station. Also see Informative Reference 4. Pseudorange. The measured range (in GPS chip) from the observed satellite to the GPS receiver antenna. Since the satellite and receiver clock biases are included, it is referred to as pseu
48、dorange. Reference Bit Boundary. A boundary between two 20-ms GPS bit intervals chosen as the reference point for code phases. RECC. Reverse Control Channel Reverse Control Channel (RECC). The control channel used from a mobile station to a base station. Reverse Link. The communication path from the
49、 mobile station to the PDE. Reverse Voice Channel (RVC). The voice channel used from a mobile station to a base station. RVC. Reverse Voice Channel. Sensitivity. The minimum level (dBm) of received GPS signal at mobile station that allows the determination of the geolocation of the mobile station. SV. Satellite vehicle or satellite. True North. The direction of the geographical North Pole, according to WGS-84, as opposed to Magnetic North, which is the direction of the North Magnetic Pole. WGS-84. World Geodetic System - 1984. See Informative Reference 3. WGS-84 Reference
