FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
COMPLETE SPECIFICATION (See Section 10 and Rule 13)
Title of invention:
METHOD FOR NextGen MISSION CRITICAL NETWORKS TO DETERMINE LOCATION OF TETRA NETWORK DEVICES
Applicant
Tata Consultancy Services Limited A company Incorporated in India under the Companies Act, 1956
Having address:
Nirmal Building, 9th floor,
Nariman point, Mumbai 400021,
Maharashtra, India
Preamble to the description
The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD [001] The disclosure herein generally relates to telecommunication networks, and, more particularly, to a method for NextGen mission critical networks to determine location of tetra network devices.
BACKGROUND
[002] Land Mobile Radio (LMR) systems provide reliable, secure and highly available “mission critical’ secure voice and low bandwidth data communications based on instant push-to-talk (PTT) technology. Terrestrial Trunked Radio (TETRA), which is LMR technology widely used in narrowband communication. From various application perspective, low bandwidth support of TETRA is considered as a limitation.
[003] The 3rd Generation Partnership Project (3GPP) defines standardization of broadband wireless technologies such as 4G and 5G. Key enablers or features of these technology are higher spectrum efficiency and high data rates. The 3GPP has created Mission Critical Broadband and the relevant mission critical features are being enhanced as specific use-cases for critical applications. Mission Critical Push-To-Talk (MCPTT) is one such technology.
[004] As LMR networks deployment have significant installed base and 4G 5G technologies are still evolving, there will be significant duration during which both the technologies will have to co-exist. This would need interworking between these two technologies with interoperable solutions to facilitate communications across technologies. Unexpected incidents or critical situations need users of 3GPP technology to involve TETRA users to form a hybrid group to initiate Push-To-Talk communications. However, for the interworking between the MCPTT and TETRA to work, location information for all members/devices associated with TETRA is needed by a MCPTT server, which allows the MCPTT server to have better situational awareness and enable requisite location based features.
[005] However, 3GPP MCPTT and TETRA are based on different technologies. As per 3GPP standards, MCPTT is based on IP protocol (mainly

SIP) while TETRA as per ETSI standards is based on ISI (QSIG based) protocol. Due to absence of a vendor-independent protocol for communication between the MCPTT and TETRA, in current interworking scenario, location information of the TETRA Mobile Stations (MS) is not shared with the MCPTT server by a TETRA location server.
SUMMARY [006] Embodiments of the present disclosure present technological improvements as solutions to one or more of the above-mentioned technical problems recognized by the inventors in conventional systems. For example, in one embodiment, a hybrid communication network is provided. The hybrid communication network includes at least one Terrestrial Trunked Radio (TETRA) location server from a LMR network, a plurality of TETRA Mobile Stations (MS), wherein each of the plurality of TETRA MS is in communication with the TETRA location server, an Interworking Module (IM), and a Mission Critical Push-To-Talk (MCPTT) server from a MCPTT network. The MCPTT server obtains location information of at least one of the plurality of TETRA MS. In the process of obtaining the location information of the at least one LMR MS, the MCPTT server transmits a set of location procedures in a first SIP (Session Initiation Protocol) message to the IM, wherein the first SIP message indicates the type of the location information required and at least one trigger in response to which the location information of the at least one TETRA MS is to be shared with the MCPTT server. The IM selects a first Location Information Protocol (LIP) message equivalent to the first SIP message from a set of LIP messages, wherein the first LIP message is selected based on a pre-defined mapping of the first SIP message with the first LIP message, wherein the set of LIP messages are based on an LIP protocol. The IM then transmits the first LIP message to the TETRA Location Server. The IM receives a second LIP message from the TETRA Location Server, wherein the second LIP message indicates one of an acknowledgement that the TETRA Location Server is in receipt of the first LIP message and a confirmation on whether or not the TETRA Location Server

updated the location configuration on the TETRA MS. The IM then selects a second SIP message equivalent to the second LIP message from the set of SIP messages, wherein the second SIP message is selected based on a pre-defined mapping of the second LIP message with the second SIP message. The IM then transmits the selected second SIP message to the MCPTT Server.
[007] In another aspect, a processor implemented method for communication is provided. In this method, a Mission Critical Push-To-Talk (MCPTT) server transmits a set of location procedures in a first SIP (Session Initiation Protocol) message to an Interworking Module (IM), wherein the first SIP message indicates the type of the location information required and at least one trigger in response to which the location information of the at least one Terrestrial Trunked Radio (TETRA) Mobile Station (MS) is to be shared with the MCPTT server. The IM selects a first Location Information Protocol (LIP) message equivalent to the first SIP message from a set of LIP messages, wherein the first LIP message is selected based on a pre-defined mapping of the first SIP message with the first LIP message, wherein the set of LIP messages are based on an LIP protocol. The IM then transmits the first LIP message to the TETRA Location Server. The IM receives a second LIP message from the TETRA Location Server, wherein the second LIP message indicates one of an acknowledgement that the TETRA Location Server is in receipt of the first LIP message and a confirmation on whether or not the TETRA Location Server updated the location configuration on the TETRA MS. The IM then selects a second SIP message equivalent to the second LIP message from the set of SIP messages, wherein the second SIP message is selected based on a pre-defined mapping of the second LIP message with the second SIP message. The IM then transmits the selected second SIP message to the MCPTT Server.
[008] In yet another aspect, a non-transitory computer readable medium for mapping of messages transmitted between a Mission Critical Push-To-Talk (MCPTT) server and a TETRA location server is provided. The non-transitory computer readable medium obtains a first Session Initiation Protocol (SIP) message from the MCPTT server, wherein the first SIP message indicates the type

of the location information required and at least one trigger in response to which the location information of the at least one Terrestrial Trunked Radio (TETRA) Mobile Station (MS) is to be shared with the MCPTT server. The non-transitory computer readable medium selects a first Location Information Protocol (LIP) message equivalent to the first SIP message from a set of LIP messages, wherein the first LIP message is selected based on a pre-defined mapping of the first SIP message with the first LIP message, wherein the set of LIP messages are based on an LIP protocol. The non-transitory computer readable medium then transmits the first LIP message to the TETRA Location Server. The non-transitory computer readable medium then receives a second LIP message from the TETRA Location Server, wherein the second LIP message indicates one of an acknowledgement that the TETRA Location Server is in receipt of the first LIP message and a confirmation on whether or not the TETRA Location Server updated the location configuration on the TETRA MS. The non-transitory computer readable medium then selects a second SIP message equivalent to the second LIP message from the set of SIP messages, wherein the second SIP message is selected based on a pre-defined mapping of the second LIP message with the second SIP message. The non-transitory computer readable medium then transmits the selected second SIP message to the MCPTT Server. In the hybrid communication network, the non-transitory computer readable medium maybe implemented in an Interworking Module (IM).
[009] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS [010] The accompanying drawings, which are incorporated in and
constitute a part of this disclosure, illustrate exemplary embodiments and, together
with the description, serve to explain the disclosed principles:
[011] FIG. 1 illustrates an exemplary hybrid communication network,
according to some embodiments of the present disclosure.

[012] FIG. 2 is a flow diagram depicting steps involved in the process of location information exchange between an MCPTT server and a TETRA location server in the hybrid communication network of FIG. 1, according to some embodiments of the present disclosure.
[013] FIG. 3 illustrates flow of messages between components of the hybrid communication network during location information exchange for Periodic and cellChange triggers, in accordance with some embodiments of the present disclosure.
[014] FIG. 4 illustrates flow of messages between components of the hybrid communication network during location information exchange for Immediate Request, PowerOn, and EnterService triggers, in accordance with some embodiments of the present disclosure.
DETAILED DESCRIPTION OF EMBODIMENTS [015] Exemplary embodiments are described with reference to the accompanying drawings. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. Wherever convenient, the same reference numbers are used throughout the drawings to refer to the same or like parts. While examples and features of disclosed principles are described herein, modifications, adaptations, and other implementations are possible without departing from the scope of the disclosed embodiments. It is intended that the following detailed description be considered as exemplary only, with the true scope being indicated by the following claims.
[016] Referring now to the drawings, and more particularly to FIG. 1 through FIG. 4, where similar reference characters denote corresponding features consistently throughout the figures, there are shown preferred embodiments and these embodiments are described in the context of the following exemplary system and/or method.
[017] FIG. 1 illustrates an exemplary hybrid communication network, according to some embodiments of the present disclosure. The hybrid communication network 100 includes a mission critical push-to-talk (MCPTT)

network 101, a Land Mobile Radio (LMR) network 102, and an Interworking Module (IM) 105. The MCPTT network 101 includes a MCPTT server 103 which is in communication with a plurality of Mobile Stations 106 (MCPTT MS). The LMR network 102 includes a terrestrial trunked radio (TETRA) Location server 104 which is in communication with a plurality of Mobile Stations (MS)/TETRA MS 107. Working of the hybrid communication network 100 is explained with reference to FIG.2, FIG. 3, and FIG. 4.
[018] In an interworking scenario, the MCPTT server 101 requires location information pertaining to one or more MSs 107 associated with the TETRA location server 104. In order to obtain the location information, the MCPTT server 101 transmits (202) a set of location procedures (including ‘Location Reporting Configuration’, ‘200 OK’, and ‘Location Information Report’) in a first Session Initiation Protocol (SIP) message to the IM 105, wherein the first SIP message indicates the type of the location information required and at least one trigger in response to which the location information of the at least one TETRA MS//TETRA device (107) is to be shared with the MCPTT server 103.
[019] The IM 105 receives first SIP message and performs a protocol and payload conversion. During the protocol and payload conversion, the IM selects (204) a first Location Information Protocol (LIP) message equivalent to the first SIP message from a set of LIP messages including ‘Basic Location Parameter Request’, and ‘Basic Location Parameter Response’, ADD/MODIFY Trigger Request, Long Location Report, and Immediate Location Report Request. In an embodiment, the selection of the first LIP message equivalent to the first SIP message is based on a pre-defined mapping of a plurality of SIP messages and corresponding LIP messages. The selected first LIP message is then transmitted (206) to the TETRA location server 104. The TETRA location server 104 fetches the first LIP message, and sends a second LIP message in response to the IM 105 from the set of LIP messages. The second LIP message indicates one of an acknowledgement that the TETRA Location Server is in receipt of the first LIP

message and a confirmation on whether or not the TETRA Location Server updated the location configuration on the TETRA MS 107.
[020] The IM 105 receives (208) the second LIP message and selects (210) a second SIP message (having location procedures including set of location procedures including ‘Location Reporting Configuration’, ‘200 OK’, and ‘Location Information Report’) which is equivalent to the second LIP message, from a set of SIP messages, based on a pre-defined mapping between SIP and LIP messages. The second LIP message is then transmitted (212) to the MCPTT server 103 as a response to the first SIP message, by the IM.
[021] As the first SIP message, and the corresponding first LIP message specify the type of trigger in response to which the location information of the MS is to be shared with the MCPTT server, upon detecting occurrence of the specified trigger, the MS 107 updates own location with the TETRA location server 104, which in turn transmits the location information to the MCPTT server 103.
[022] Type of messages and parameters used vary for different types of triggers used. The protocol and payload conversion in different scenarios (in terms of trigger specified) are explained below:
1. For Periodic/CellChange triggers:
[023] The various messages and parameters used for the Periodic/CellChange triggers are depicted in FIG. 3. The MCPTT server 103 transmits a ‘Location Reporting Configuration’ SIP message as the first SIP message to the IM 105. The Periodic triggers specifies that the location information is to be transmitted periodically, and time interval between every successive transmission of the location information may be specified in the ‘Location Reporting Configuration’ SIP message. The CellChange trigger specifies that location information of a targeted MS 107 to be sent every time the MS 107 changes current serving cell. The type of the location information required may be ‘Geographical coordinates’, and may vary based on requirements.
[024] The IM 105 maps the ‘Location Reporting Configuration’ SIP message to a ‘Basic Location Parameter Request’ LIP message, based on the pre-

defined mapping, and transmits the ‘Basic Location Parameter Request’ LIP message to the TETRA Location Server 104 to configure a minimum location reporting interval and report type for the MS 107 via the TETRA Location Server 104. Mappings performed by the IM 105 at this stage are given below: Message mapping:

MCPTT TETRA
Location Reporting Configuration Basic Location Parameter Request
Parameter mapping:

MCPTT TETRA
Configuration LIP-Basic LOCATION PARAMETER REQUEST
minimumIntervalLength Minimum reporting interval
GeographicalCoordinate Long location report preferred with no time information
To Header Address or identification type
[025] Contents of the Basic LOCATION PARAMETER REQUEST LIP
message are given below:
Information element Value

PDU type Long location message
PDU Type Extension LIP-Basic LOCATION
PARAMETER REQUEST
Acknowledgement request Acknowledgement requested
Minimum reporting interval 10s
Report type Long location report preferred with
no time information
Terminal or location identification Present
Address or identification type SSI+MNI
Location information destination T5 present

Address or identification type IM address
[026] After the MS 107 updates its location configuration, the MS 107 sends the ‘BASIC Location Parameter Response’ acknowledgement LIP message to the TETRA location server 104. The TETRA location server 104 transmits the ‘BASIC Location Parameter Response’ LIP message to the IM 105. A result code in the ‘BASIC Location Parameter Response’ message indicates whether the configuration of location information was successful or not.
‘Basic Location Parameter Response’ LIP message contents:
Information element Value

PDU type Long location message
PDU Type Extension LIP-Basic LOCATION PARAMETER
RESPONSE
Result code Success
Location reporting enable flags Location reporting globally
Minimum reporting interval 10s
Report type Long location report preferred
with no time information
Terminal or location identification Present
Address or identification type SSI+MNI
Location information destination T5 present
Address or identification type IM address
[027] Based on the pre-defined mapping of SIP messages and
corresponding LIP messages, the IM 105 maps the ‘BASIC Location Parameter
Response’ LIP message to a ‘200 OK’ SIP acknowledge message. The IM 105
further transmits the ‘200 OK’ SIP acknowledge message to the MCPTT server
103 so as to acknowledge that the ‘Location reporting configuration’ SIP message
been processed.
[028] The message mapping done by the IM 105 at this stage is:

TETRA MCPTT
Basic Location Parameter Response 200 OK
The 200 OK message includes: Session Initiation Protocol (200 OK)
From: To: Call-ID: The request call identifier [029] The IM 105 maps triggers in the ‘Location reporting Configuration’ SIP message to ‘ADD/MODIFY TRIGGER Request’ LIP message and transmits the ‘ADD/MODIFY TRIGGER Request’ LIP message to the TETRA Location server 104, so as to trigger the location reporting for the MS 107 whenever the MS 107 changes current serving cell or reaches a maximum reporting interval. Mappings performed by the IM 105 during this process are given below:
[030] Message Mapping:

MCPTT TETRA
Location reporting Configuration ADD/MODIFY TRIGGER Request
[001] Parameter Mapping:

MCPTT TETRA
Triggering Criteria Trigger Type
[031] Contents of the ADD/MODIFY TRIGGER Request LIP message
are:
Information element Value

PDU type Long location message
PDU Type Extension LIP-ADD/MODIFY TRIGGER
REQUEST
Acknowledgement request No acknowledgement requested

Report type Long location report preferred with
no time information
Terminal or location identification Present
Address or identification type SSI+MNI
Location information destination T5 present
Address or identification type IM address
Start time DD/HH/MM/SS
Stop time DD/HH/MM/SS
Trigger definition Present
Trigger type Maximum reporting interval
Maximum reporting interval 30s
One-shot/recurring One-shot / Recurring
Trigger type Change of serving cell
One-shot/recurring One-shot / Recurring
[032] When the Periodic trigger (and a corresponding time interval) is
specified, upon expiry of the specified time interval, the MS 107 transmits ‘Long
Location Report’ LIP message to the TETRA Location server 104. The TETRA
Location server 104 transmits the ‘Long Location Report’ LIP message to the IM
105.
[033] Contents of the ‘Long Location Report’ LIP message for ‘Periodic’
trigger are:
Information element Value

PDU type Long location message
PDU Type Extension LIP-LONG LOCATION REPORT
Time data None
Location data Location Point
Longitude 33.34232
Latitude 55.123663
Velocity data No velocity information
Acknowledgement request No acknowledgement requested
Type of additional data Reason for sending

User defined data Maximum reporting interval exceeded
since the last location report
Terminal or location identification T5 present
Address or identification type SSI+MNI
[034] The IM 105 maps the ‘Long Location Report’ LIP message to ‘Location Information Report’ SIP message so as to send periodic location report of the MS 107 to the MCPTT server 103. Mappings performed by the IM 105 at this stage are:
[035] Message Mapping:

TETRA MCPTT
Long Location report Location Information Report
[002] Parameter Mapping:

TETRA MCPTT
Location data CurrentCoordinate
User defined data TriggerId
Address or identification type From header
[036] Contents of the Location Information Report SIP message are: Session Initiation Protocol (MESSAGE)
From: To: Content-Type: application/vnd.3gpp.mcptt-location-info+xml Message Body
eXtensible Markup Language


55.123663

33.34232

Periodic

[037] If the trigger is ‘CellChange’, then the MS 107 updates location
information by sending the ‘Long Location Report’ LIP message to the TETRA
Location server 104. The TETRA Location server 104 transmits the ‘Long
Location Report’ LIP message to the IM 105.
[038] Contents of the ‘Long Location Report’ LIP message for the
cellChange trigger are:
Information element Value

PDU type Long location message
PDU Type Extension LIP-LONG LOCATION REPORT
Time data None
Location data Location Point
Longitude 33.34232
Latitude 55.123663
Velocity data No velocity information
Acknowledgement request No acknowledgement requested
Type of additional data Reason for sending
User defined data Cell Reselection
Terminal or location identification T5 present
Address or identification type SSI+MNI

[039] The IM 105 maps the ‘Long Location Report’ LIP message to ‘Location Information Report’ SIP message, and transmits a CellChange location report of the MS 107 to the MCPTT server 103. Mappings performed by the IM 105 at this stage are:
[040] Message Mapping:

TETRA MCPTT
Long Location Report Location Information Report
[003] Parameter Mapping:

TETRA MCPTT
Location data CurrentCoordinate
User defined data TriggerId
Address or identification type From header
[041] Contents of the ‘Location Information Report’ for the CellChange trigger are:
Session Initiation Protocol (MESSAGE)
From: To: Content-Type: application/vnd.3gpp.mcptt-location-info+xml Message Body
eXtensible Markup Language

55.123663

33.34232

AnyCellChange

2.For Immediate requests/PowerOn trigger/EnterService trigger:
[042] Protocol and payload conversion details for the Immediate requests, PowerOn trigger, and the EnterService trigger are explained in reference to FIG. 4, below. The PowerOn trigger, and the EnterService trigger are newly defined triggers for obtaining location information in certain use-cases. The PowerOn trigger is to obtain the location information when the MS 107 is powered ON from an OFF state. The EnterService trigger is to obtain the location information when the MS 107 enters the service. Mapping of extensions to known ‘TriggeringCriteria’ to the MCPTT server 103 is enabled using ‘anyExt’ element of ‘TriggeringCriteriaType’.
[043] The MCPTT server 103 transmits the ‘Location Reporting Configuration’ SIP message to the IM 105 in order to configure the triggers PowerOn and EnterService. Contents of the ‘Location Reporting Configuration’ SIP message are:
Session Initiation Protocol (MESSAGE)
From:
To:
Call-ID: The request call identifier
Content-Type: application/vnd.3gpp.mcptt-location-info+xml
Message Body
eXtensible Markup Language


10
[044] The IM 105 maps the ‘Location reporting Configuration’ SIP message to a ‘Basic Location Parameter Request’ LIP message and transmits the ‘Basic Location Parameter Request’ LIP message to the TETRA Location server 104, so as to configure the minimum location reporting interval and the report type for the MS 107. Contents of the ‘Basic Location Parameter Request’ LIP message are:

Information element Value

PDU type Long location message
PDU Type Extension LIP-Basic LOCATION
PARAMETER REQUEST
Acknowledgement request Acknowledgement requested
Minimum reporting interval 10s
Report type Long location report preferred
with no time information
Terminal or location identification Present
Address or identification type SSI+MNI
Location information destination T5 present
Address or identification type IM address
[045] After updating location configuration, the MS 107 sends a ‘Basic
Location Parameter response’ acknowledgement LIP message to the TETRA
location server 104. The TETRA location server 104 transmits the ‘Basic
Location Parameter response’ acknowledgement LIP message to the IM 105. A
‘Result Code’ in the ‘Basic Location Parameter response’ acknowledgement LIP
message indicates whether the configuration was successful or not. Contents of
the ‘Basic Location Parameter response’ acknowledgement LIP message are:
Information element Value

PDU type Long location message
PDU Type Extension LIP-Basic LOCATION
PARAMETER RESPONSE
Result code Success
Location reporting enable flags Location reporting globally
Minimum reporting interval 10s
Report type Long location report
preferred with no time
information
Terminal or location identification Present

Address or identification type SSI+MNI
Location information destination T5 present
Address or identification type IM address
5 [046] The IM 105 maps the ‘Basic Location Parameter response’
acknowledgement LIP message to ‘200 OK’ SIP acknowledge message and
transmits the ‘200 OK’ SIP acknowledge message to the MCPTT server 103 to
acknowledge that the ‘Location Reporting Configuration’ SIP message has been
processed. Contents of the ‘200 OK’ SIP acknowledge message are:
10 Session Initiation Protocol (200 OK)
From: To: Call-ID: The request call identifier
[047] The IM 105 maps triggers in the ‘Location Reporting
15 Configuration’ SIP message to ‘ADD/MODIFY TRIGGER Request’ LIP message
and transmits to the TETRA Location Server 104. The mappings performed by the IM 105 at this stage are: Message Mapping:

MCPTT TETRA
Location reporting configuration ADD/MODIFY TRIGGER Request
Parameter Mapping:

MCPTT TETRA
TriggeringCriteria Trigger Type
[004] Contents of the ADD/MODIFY TRIGGER LIP Request are:
Information element Value

PDU type Long location message
PDU Type Extension LIP-ADD/MODIFY TRIGGER REQUEST
Acknowledgement request No acknowledgement requested

Report type Long location report preferred
with no time information
Terminal or location identification Present
Address or identification type SSI+MNI
Location information destination T5 present
Address or identification type IM address
Start time DD/HH/MM/SS
Stop time DD/HH/MM/SS
Trigger definition Present
Trigger type Subscriber unit is powered ON
One-shot/recurring One-shot / Recurring
Trigger type Enter service (after being out of
service)
One-shot/recurring One-shot / Recurring
[048] Upon detecting that the MS 107 is not under TETRA service, the
MS 107 or the TETRA Location Server 104 builds and sends a ‘Long Location
Report’ LIP message for on-demand immediate location request. A ‘Result Code’
parameter in the ‘Long Location Report’ LIP message indicates that the MS 107 is
not under TETRA service. Contents of the Long Location Report are:
Information element Value

PDU type Long location message
PDU Type Extension LIP-LONG LOCATION REPORT
Time data None
Location data No Shape
Velocity data No velocity information
Acknowledgement request No acknowledgement requested
Type of additional data Reason for sending
User defined data
Terminal or location identification T5 present
Address or identification type SSI+MNI
Result code Absent Subscriber

[049] The IM maps the ‘Long Location report’ LIP message to ‘Location Information Report’ SIP message so as to send the immediate location report response of the MS 107 to the MCPTT server 103. ‘AnyExt’ extension field in the ‘Location Information Report’ SIP message is used to indicate the ‘Result Code’ to the MCPTT server 103. Mapping done by the IM 105 at this stage are:
[050] Message Mapping:

TETRA MCPTT
Long Location report Location Information Report
[051] Parameter Mapping:

TETRA MCPTT
Result Code AnyExt (AnyResultcode)
[052] Contents of the Location Information Report SIP message are: Session Initiation Protocol (MESSAGE)
From: To: Content-Type: application/vnd.3gpp.mcptt-location-info+xml Message Body
eXtensible Markup Language

Absent Subscriber

[053] If the EnterService trigger is configured, when the MS 107 enters the service it detects the EnterService trigger, and in response sends the ‘Long

Location Report’ LIP message to the TETRA Location server 104. The TETRA
Location server 104 transmits the ‘Long Location Report’ LIP message to the IM
105. Contents of the ‘Long Location Report’ LIP message are:
Information element Value

PDU type Long location message
PDU Type Extension LIP-LONG LOCATION REPORT
Time data None
Location data Location Point
Longitude 33.34232
Latitude 55.123663
Velocity data No velocity information
Acknowledgement request No acknowledgement requested
Type of additional data Reason for sending
User defined data Enter Service
Terminal or location identification T5 present
Address or identification type SSI+MNI
[054] The IM 105 maps the Long Location report LIP message to
‘Location Information Report’ SIP message, and transmits to the MCPTT server
103 as a location report response of the MS 107. Mapping performed by the IM
105 at this stage are:
[055] Message Mapping:

TETRA MCPTT
Long Location Report Location Information Report
[056] Parameter Mapping:

TETRA MCPTT
Location data CurrentCoordinate
User defined data TriggerId
[057] Contents of the Location Information report are:

Session Initiation Protocol (MESSAGE)
From: To: Content-Type: application/vnd.3gpp.mcptt-location-info+xml Message Body
eXtensible Markup Language

55.123663 33.34232
EnterService [058] During the protocol conversion and mapping for various triggers, the IM 105 performs at least the following mappings: a Location Reporting Configuration’ SIP message to a ‘Basic Location Parameter Request‘ LIP message, a ‘Configuration‘ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘LIP-Basic LOCATION PARAMETER REQUEST’ in a ‘Basic Location Parameter Request’ LIP message, a ‘minimumIntervalLength‘ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘Minimum reporting

interval’ in the ‘Basic Location Parameter Request’ LIP message, a ‘GeographicalCordinate’ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘Long location report preferred with no time information’ in the ‘Basic Location Parameter Request ‘LIP message, and a ‘To header‘ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘Address or identification type’ in the ‘Basic Location Parameter Request’ LIP message, a ‘Location Reporting Configuration’ SIP message to a ‘ADD/MODIFY TRIGGER Request’ LIP message, a ‘TriggeringCriteria‘ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘Trigger type’ in a ‘ADD/MODIFY TRIGGER Request’ LIP message, a ‘Long Location Report’ LIP message to a ‘Location Information Report’ SIP message, a ‘Location data’ parameter in the ‘Long Location Report’ LIP message to a ‘CurrentCoordinate’ in the ‘Location Information Report’ SIP message, a ‘User defined data’ parameter in the ‘Long Location Report’ LIP message to a ‘TriggerId’ in the ‘Location Information Report’ SIP message, ‘Address or identification type’ parameter in the ‘Long Location Report’ LIP message to a ‘From header’ in a ‘Location Information Report’ SIP message, a ‘Long Location Report’ LIP message to a ‘Location Information Report’ SIP message; ‘Result code’ parameter in the ‘Long Location Report’ LIP message to a ‘AnyResultcode’ in a ‘Location Information Report’ SIP message, a ‘Location Information Request’ SIP Message to a ‘Immediate Location Report Request’, a ‘Request ‘ parameter in the ‘Location Information Request’ SIP Message to a ‘LIP-Immediate LOCATION Report REQUEST’ in the ‘Immediate Location Report Request’ LIP message, and a ‘Basic Location Parameter Response’ LIP Message to a ‘200 OK ‘ SIP Message. The IM 105 also maps IM maps the periodic trigger to a ‘maximum reporting interval trigger’ on TETRA side, the cellChange trigger to a ‘Change of serving cell trigger’ on the TETRA side, the PowerOn trigger to a ‘Subscriber unit is powered ON’ trigger on the TETRA side, and the EnterService trigger to a ‘Enter service trigger’ on the TETRA side.
[059] The method 200 allows the MCPTT server 103 in 4G/5G communication networks (including WiFi) to collect location information of one

or more TETRA MS 107. The location information thus obtained may be used for various applications such as but not limited to interworking of the LMR network 102 and the MCPTT network 101. The MCPTT server 103 in the 4G/5G communication networks is collectively referred to as NextGen mission critical networks, in context of the description provided.
[060] The written description describes the subject matter herein to enable any person skilled in the art to make and use the embodiments. The scope of the subject matter embodiments is defined by the claims and may include other modifications that occur to those skilled in the art. Such other modifications are intended to be within the scope of the claims if they have similar elements that do not differ from the literal language of the claims or if they include equivalent elements with insubstantial differences from the literal language of the claims.
[061] The embodiments of present disclosure herein addresses unresolved problem of location information exchange between a MCPTT server and a TETRA location network in an interworking scenario. The embodiment, thus provides mapping between MCPTT and TETRA protocols.
[062] It is to be understood that the scope of the protection is extended to such a program and in addition to a computer-readable means having a message therein; such computer-readable storage means contain program-code means for implementation of one or more steps of the method, when the program runs on a server or mobile device or any suitable programmable device. The hardware device can be any kind of device which can be programmed including e.g. any kind of computer like a server or a personal computer, or the like, or any combination thereof. The device may also include means which could be e.g. hardware means like e.g. an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a combination of hardware and software means, e.g. an ASIC and an FPGA, or at least one microprocessor and at least one memory with software processing components located therein. Thus, the means can include both hardware means and software means. The method embodiments described herein could be implemented in hardware and software. The device may

also include software means. Alternatively, the embodiments may be implemented on different hardware devices, e.g. using a plurality of CPUs.
[063] The embodiments herein can comprise hardware and software elements. The embodiments that are implemented in software include but are not limited to, firmware, resident software, microcode, etc. The functions performed by various components described herein may be implemented in other components or combinations of other components. For the purposes of this description, a computer-usable or computer readable medium can be any apparatus that can comprise, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
[064] The illustrated steps are set out to explain the exemplary
embodiments shown, and it should be anticipated that ongoing technological
development will change the manner in which particular functions are performed.
These examples are presented herein for purposes of illustration, and not
limitation. Further, the boundaries of the functional building blocks have been
arbitrarily defined herein for the convenience of the description. Alternative
boundaries can be defined so long as the specified functions and relationships
thereof are appropriately performed. Alternatives (including equivalents,
extensions, variations, deviations, etc., of those described herein) will be apparent to persons skilled in the relevant art(s) based on the teachings contained herein. Such alternatives fall within the scope of the disclosed embodiments. Also, the words “comprising,” “having,” “containing,” and “including,” and other similar forms are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise.
[065] Furthermore, one or more computer-readable storage media may be utilized in implementing embodiments consistent with the present disclosure. A

computer-readable storage medium refers to any type of physical memory on which information or data readable by a processor may be stored. Thus, a computer-readable storage medium may store instructions for execution by one or more processors, including instructions for causing the processor(s) to perform steps or stages consistent with the embodiments described herein. The term “computer-readable medium” should be understood to include tangible items and exclude carrier waves and transient signals, i.e., be non-transitory. Examples include random access memory (RAM), read-only memory (ROM), volatile memory, nonvolatile memory, hard drives, CD ROMs, DVDs, flash drives, disks, and any other known physical storage media.
[066] It is intended that the disclosure and examples be considered as exemplary only, with a true scope of disclosed embodiments being indicated by the following claims.

We Claim
1. A hybrid communication network (100), comprising:
at least one Terrestrial Trunked Radio (TETRA) location server
(104) from a Land Mobile Radio (LMR) network (102);
a plurality of TETRA Mobile Stations (MS) (107), wherein each of
the plurality of TETRA MS (107) is in communication with the
TETRA location server (104);
an Interworking Module (IM) (105); and
a Mission Critical Push-To-Talk (MCPTT) server (103) from a
MCPTT network (101), wherein the MCPTT server (103) obtains
location information of at least one of the plurality of TETRA MS
(107), wherein the process of obtaining the location information of
the at least one TETRA MS (107) comprises:
transmitting (202) a set of location procedures in a first SIP
(Session Initiation Protocol) message to the IM by the
MCPTT server, wherein the first SIP message indicates the
type of the location information required and at least one
trigger in response to which the location information of the
at least one TETRA MS is to be shared with the MCPTT
server;
selecting (204) by the IM, a first Location Information
Protocol (LIP) message equivalent to the first SIP message
from a set of LIP messages, wherein the first LIP message
is selected based on a pre-defined mapping of the first SIP
message with the first LIP message, wherein the set of LIP
messages are based on an LIP protocol;
transmitting (206), by the IM, the first LIP message to the
TETRA Location Server;
receiving (208), by the IM, a second LIP message from the
TETRA Location Server, wherein the second LIP message
indicates one of an acknowledgement that the TETRA

Location Server is in receipt of the first LIP message and a
confirmation on whether or not the TETRA Location
Server updated the location configuration on the TETRA
MS;
selecting (210), by the IM, a second SIP message
equivalent to the second LIP message from the set of SIP
messages, wherein the second SIP message is selected
based on a pre-defined mapping of the second LIP message
with the second SIP message; and
transmitting (212), by the IM, the selected second SIP
message to the MCPTT Server.
2. The hybrid communication network (100) as claimed in claim 1, wherein the set of Location procedures in the first SIP message and the second SIP message comprises of ‘Location Reporting Configuration’, ‘200 OK’, and ‘Location Information Report’.
3. The hybrid communication network (100) as claimed in claim 1, wherein each of the first LIP message and the second LIP message comprises at least one of a ‘Basic Location Parameter Request’, a ‘Basic Location Parameter Response’, an ‘ADD/MODIFY Trigger Request’, a ‘Long Location Report’, and an ‘Immediate Location Report Request’.
4. The hybrid communication network (100) as claimed in claim 2, wherein the IM maps a ‘Location Reporting Configuration’ SIP message to a ‘Basic Location Parameter Request‘ LIP message, a ‘Configuration‘ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘LIP-Basic LOCATION PARAMETER REQUEST’ in the ‘Basic Location Parameter Request’ LIP message, a ‘minimumIntervalLength‘ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘Minimum reporting interval’ in the ‘Basic Location Parameter Request’

LIP message, a ‘GeographicalCordinate’ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘Long location report preferred with no time information’ in the ‘Basic Location Parameter Request ‘LIP message, and a ‘To header‘ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘Address or identification type’ in the ‘Basic Location Parameter Request’ LIP message.
5. The hybrid communication network (100) as claimed in claim 2, wherein the IM maps a ‘Location Reporting Configuration’ SIP message to a ‘ADD/MODIFY TRIGGER Request’ LIP message, a ‘TriggeringCriteria‘ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘Trigger type’ in the ‘ADD/MODIFY TRIGGER Request’ LIP message, a ‘Long Location Report’ LIP message to a ‘Location Information Report’ SIP message, a ‘Location data’ parameter in the ‘Long Location Report’ LIP message to a ‘CurrentCoordinate’ in the ‘Location Information Report’ SIP message, a ‘User defined data’ parameter in the ‘Long Location Report’ LIP message to a ‘TriggerId’ in the ‘Location Information Report’ SIP message, ‘Address or identification type’ parameter in the ‘Long Location Report’ LIP message to a ‘From header’ in the ‘Location Information Report’ SIP message, a ‘Long Location Report’ LIP message to the ‘Location Information Report’ SIP message, a ‘Result code’ parameter in the ‘Long Location Report’ LIP message to a ‘AnyResultcode’ in the ‘Location Information Report’ SIP message, a ‘Location Information Request’ SIP Message to an ‘Immediate Location Report Request’, a ‘Request’ parameter in the ‘Location Information Request’ SIP Message to a ‘LIP-Immediate LOCATION Report REQUEST’ in the ‘Immediate Location Report Request’ LIP message, and a ‘Basic Location Parameter Response’ LIP Message to a ‘200 OK’ SIP Message.

6. The hybrid communication network (100) as claimed in claim 1, wherein the at least one trigger is at least one of a periodic trigger, a cellChange trigger, a PowerOn trigger, and an EnterService trigger on MCPTT Server side.
7. The hybrid communication network (100) as claimed in claim 6, wherein the IM maps the periodic trigger to a ‘maximum reporting interval trigger’ on TETRA side, the cellChange trigger to a ‘Change of serving cell trigger’ on the TETRA side, the PowerOn trigger to a ‘Subscriber unit is powered ON’ trigger on the TETRA side, and the EnterService trigger to a ‘Enter service trigger’ on the TETRA side.
8. The hybrid communication network (100) as claimed in claim 6, wherein a data flow executed by the hybrid communication network for at least one of the PowerOn trigger and the EnterService trigger comprises:
transmitting a Location Information Configuration as the first SIP message to the IM by the MCPTT server, wherein the first SIP message indicates the type of the location information required and the at least one trigger as at least one of the PowerOn trigger and the EnterService trigger; mapping the Location Information Configuration SIP message to a Basic Location Parameter Request LIP message and transmitting to the TETRA Location Server, by the IM;
configuring a minimum reporting interval and a report type for at least one TETRA MS, in response to the Location Parameter Request LIP message received from the IM, by the TETRA Location Server;
updating own location configuration and sending a ‘BASIC Location Parameter Response’ acknowledgement LIP message to the TETRA Location Server, by the at least one TETRA MS;

transmitting the ‘BASIC Location Parameter Response’ acknowledgement LIP message received from the at least one TETRA MS to the IM, by the TETRA Location Server; and
mapping the ‘BASIC Location Parameter Response’ acknowledgement LIP message received from the TETRA Location Server to ‘200 OK’ SIP acknowledgement message and sending to the MCPTT server, by the IM, wherein the ‘200 OK’ SIP acknowledgement message indicates to the MCPTT server that the Location Information Configuration has been processed by the at least one TETRA MS.
9. A processor implemented method (200) for communication, comprising:
transmitting (202) a set of location procedures in a first SIP (Session Initiation Protocol) message to an Interworking Module (IM) by a Mission Critical Push-To-Talk (MCPTT) server, wherein the first SIP message indicates the type of the location information required and at least one trigger in response to which the location information of the at least one Terrestrial Trunked Radio (TETRA) Mobile Station (MS) is to be shared with the MCPTT server;
selecting (204) by the IM, a first Location Information Protocol (LIP) message equivalent to the first SIP message from a set of LIP messages, wherein the first LIP message is selected based on a pre-defined mapping of the first SIP message with the first LIP message, wherein the set of LIP messages are based on an LIP protocol;
transmitting (206), by the IM, the first LIP message to the TETRA Location Server; receiving, by the IM, a second LIP message from the TETRA Location Server, wherein

the second LIP message indicates one of an
acknowledgement that the TETRA Location Server is in
receipt of the first LIP message and a confirmation on
whether or not the TETRA Location Server updated the
location configuration on the TETRA MS;
receiving (208), by the IM, a second LIP message from the
TETRA Location Server, wherein the second LIP message
indicates one of an acknowledgement that the TETRA
Location Server is in receipt of the first LIP message and a
confirmation on whether or not the TETRA Location
Server updated the location configuration on the TETRA
MS;
selecting (210), by the IM, a second SIP message
equivalent to the second LIP message from the set of SIP
messages, wherein the second SIP message is selected
based on a pre-defined mapping of the second LIP message
with the second SIP message; and
transmitting (212), by the IM, the selected second SIP
message to the MCPTT Server.
10. The method (200) as claimed in claim 9, wherein the set of Location procedures in the first SIP message and the second SIP message comprises of ‘Location Reporting Configuration’, ‘200 OK’, and ‘Location Information Report’.
11. The method (200) as claimed in claim 9, wherein each of the first LIP message and the second LIP message comprises at least one of a ‘Basic Location Parameter Request’, a ‘Basic Location Parameter Response’, an ADD/MODIFY Trigger Request, a Long Location Report, and an Immediate Location Report Request.

12. The method (200) as claimed in claim 10, wherein the IM maps a Location Reporting Configuration’ SIP message to a ‘Basic Location Parameter Request‘ LIP message, ‘Configuration‘ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘LIP-Basic LOCATION PARAMETER REQUEST’ in the ‘Basic Location Parameter Request’ LIP message, a ‘minimumIntervalLength’ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘Minimum reporting interval’ in the ‘Basic Location Parameter Request’ LIP message, a ‘GeographicalCordinate‘ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘Long location report preferred with no time information’ in the ‘Basic Location Parameter Request ‘LIP message, and a ‘To header‘ parameter in the ‘Location Reporting Configuration’ SIP message to an ‘Address or identification type’ in the ‘Basic Location Parameter Request’ LIP message.
13. The method as claimed in claim 10, wherein the IM maps a ‘Location Reporting Configuration’ SIP message to a ‘ADD/MODIFY TRIGGER Request’ LIP message, a ‘TriggeringCriteria‘ parameter in the ‘Location Reporting Configuration’ SIP message to a ‘Trigger type’ in the ‘ADD/MODIFY TRIGGER Request’ LIP message, a ‘Long Location Report’ LIP message to a ‘Location Information Report’ SIP message, a ‘Location data’ parameter in the ‘Long Location Report’ LIP message to a ‘CurrentCoordinate’ in the ‘Location Information Report’ SIP message, a ‘User defined data’ parameter in the ‘Long Location Report’ LIP message to a ‘TriggerId’ in the ‘Location Information Report’ SIP message, ‘Address or identification type’ parameter in the ‘Long Location Report’ LIP message to a ‘From header’ in the ‘Location Information Report’ SIP message, a ‘Long Location Report’ LIP message to the ‘Location Information Report’ SIP message, a ‘Result code’ parameter in the ‘Long Location Report’ LIP message to a ‘AnyResultcode’ in the ‘Location Information Report’ SIP message, a ‘Location Information Request’ SIP

Message to an ‘Immediate Location Report Request’, a ‘Request’ parameter in the ‘Location Information Request’ SIP Message to a ‘LIP-Immediate LOCATION Report REQUEST’ in the ‘Immediate Location Report Request’ LIP message, and a ‘Basic Location Parameter Response’ LIP Message to a ‘200 OK’ SIP Message.
14. The method (200) as claimed in claim 9, wherein the at least one trigger is at least one of a periodic trigger, a cellChange trigger, a PowerOn trigger, and an EnterService trigger on MCPTT Server side.
15. The method (200) as claimed in claim 10, wherein the IM maps the periodic trigger to a ‘maximum reporting interval trigger’ on TETRA side, the cellChange trigger to a ‘Change of serving cell trigger’ on the TETRA side, the PowerOn trigger to a ‘Subscriber unit is powered ON’ trigger on the TETRA side, and the EnterService trigger to a ‘Enter service trigger’ on the TETRA side.
16. The method (200) as claimed in claim 14, wherein a data flow executed by the hybrid communication network for at least one of the PowerOn trigger and the EnterService trigger comprises:
transmitting a Location Information Configuration as the first SIP message to the IM by the MCPTT server, wherein the first SIP message indicates the type of the location information required and the at least one trigger as at least one of the PowerOn trigger and the EnterService trigger; mapping the Location Information Configuration SIP message to a Basic Location Parameter Request LIP message and transmitting to the TETRA Location Server, by the IM;
configuring a minimum reporting interval and a report type for at least one TETRA MS, in response to the Location

Parameter Request LIP message received from the IM, by
the TETRA Location Server;
updating own location configuration and sending a ‘BASIC
Location Parameter Response’ acknowledgement LIP
message to the TETRA Location Server, by the at least one
TETRA MS;
transmitting the ‘BASIC Location Parameter Response’
acknowledgement LIP message received from the at least
one TETRA MS to the IM, by the TETRA Location Server;
and
mapping the ‘BASIC Location Parameter Response’
acknowledgement LIP message received from the TETRA
Location Server to ‘200 OK’ SIP acknowledgement
message and sending to the MCPTT server, by the IM,
wherein the ‘200 OK’ SIP acknowledgement message
indicates to the MCPTT server that the Location
Information Configuration has been processed by the at
least one TETRA MS.