MCPTT SYSTEM AND METHOD THEREOF FOR MANAGING MCPTT BROADCAST CALL IN OFF-NETWORK SYSTEM

• US 20200137531A1
• Filed: 06/21/2019
• Published: 04/30/2020
• Est. Priority Date: 10/25/2018
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: GUPTA, Nishant, BAEK, Yun Sun
• Granted Patent: US 10,999,715 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 4/08 User group management
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 76/30 Connection release
• CPC Class Codes: H04W 76/38 triggered by timers
• CPC Class Codes: H04W 76/40 for selective distribution or broadcast
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services

Abstract

Embodiments herein provide a method for managing Mission Critical Push To Talk (MCPTT) broadcast call between a first MCPTT client and a second MCPTT client in an off-network system. The method includes establishing, by the first MCPTT client, a broadcast call, where the first MCPTT client is transitioned from a first broadcast control state to a second broadcast control state after establishing the broadcast call. Further, the method includes releasing, by the first MCPTT client, the broadcast call, where the first MCPTT client is transitioned from the second broadcast control state to the first broadcast control state after releasing the broadcast call.

Claims

1. A method for managing mission critical push to talk (MCPTT) broadcast call between a first MCPTT client and a second MCPTT client in an off-network system, the method comprising:

establishing, by the first MCPTT client, a broadcast call, wherein the first MCPTT client is transitioned from a first broadcast control state to a second broadcast control state after establishing the broadcast call; and

releasing, by the first MCPTT client, the broadcast call, wherein the first MCPTT client is transitioned from the second broadcast control state to the first broadcast control state after releasing the broadcast call.

2. The method of claim 1, wherein establishing the broadcast call comprising:

receiving an indication from a first MCPTT user to initiate the broadcast call;

generating a session descriptor (SDP) body;

storing the generated SDP body as a SDP body of the broadcast call;

generating a random number with a uniform distribution;

storing the generated random number as a call identifier of the broadcast call;

storing a first MCPTT user identifier as an originating MCPTT user identifier of the broadcast call;

storing the broadcast call as a call type;

generating a group call broadcast message;

notifying a floor participant of a bearer priority;

broadcasting the group call broadcast message;

establishing a media session based on the SDP body of the broadcast call;

triggering a broadcast retransmission timer; and

transitioning by the first MCPTT client from the first broadcast control state to the second broadcast control state.

3. The method of claim 2, wherein in the group call broadcast message, the first MCPTT client sets the call identifier information element (IE) to a stored call identifier of the broadcast call, sets a call type IE to a stored broadcast call type, sets an originating MCPTT user identifier IE to a stored originating MCPTT user identifier of the broadcast call, sets a MCPTT group identifier IE to a stored MCPTT group identifier of the broadcast call, and sets a SDP IE to a stored SDP body of the broadcast call.

4. The method of claim 1, wherein releasing the broadcast call comprising:

receiving an indication from a first MCPTT user to release the broadcast call;

releasing a media session established;

generating a group call broadcast end message;

broadcasting the group call broadcast end message;

terminating a broadcast retransmission timer; and

transitioning by the first MCPTT client from the second broadcast control state to the first broadcast control state.

5. The method of claim 4, wherein in the group call broadcast end message, the first MCPTT client sets a call identifier information element (IE) to a stored call identifier of the broadcast call, sets an originating MCPTT user identifier IE to a stored originating MCPTT user identifier of the broadcast call, and sets a MCPTT group identifier IE to a stored MCPTT group identifier of the broadcast call.

6. A method for managing mission critical push to talk (MCPTT) broadcast call between a first MCPTT client and a second MCPTT client in an off-network system, the method comprising:

receiving, by the second MCPTT client, a group call broadcast message broadcasted by the first MCPTT client;

establishing, by the second MCPTT client, a broadcast call with the first MCPTT client, wherein the second MCPTT client is transitioned from a first broadcast control state to a second broadcast control state after establishing the broadcast call with the first MCPTT client; and

releasing, by the second MCPTT client, the broadcast call with the first MCPTT client, wherein the second MCPTT client is transitioned from the second broadcast control state to the first broadcast control state after releasing the broadcast call.

7. The method of claim 6, wherein establishing the broadcast call with the first MCPTT client comprising:

storing a value of a call identifier information element (IE) of the group call broadcast message as a call identifier of the broadcast call;

storing a value of a call type IE of a group call broadcast message as a received broadcast call type;

storing a value of a session descriptor (SDP) IE of the group call broadcast message as a SDP body of the broadcast call;

storing a value of an originating MCPTT user identifier IE of the group call broadcast message as an originating MCPTT user identifier of the broadcast call;

storing a value of a MCPTT group identifier IE of the group call broadcast message as a MCPTT group identifier of the broadcast call;

determining that the second MCPTT user acknowledgement is not required;

establishing a media session with the first MCPTT client based on the stored SDP body of the broadcast call; and

transitioning by the second MCPTT client from the first broadcast control state to the second broadcast control state.

8. The method of claim 6, wherein establishing the broadcast call with the first MCPTT client comprising:

storing a value of a call identifier information element (IE) of the group call broadcast message as a call identifier of the broadcast call;

storing a value of a call type IE of a group call broadcast message as a received broadcast call type;

storing a value of a SDP IE of the group call broadcast message as a SDP body of the broadcast call;

storing a value of an originating MCPTT user identifier IE of the group call broadcast message as an originating MCPTT user identifier of the broadcast call;

storing a value of a MCPTT group identifier IE of the group call broadcast message as a MCPTT group identifier of the broadcast call;

determining that the second MCPTT user acknowledgement is required;

initiating a waiting for user timer;

transitioning by the second MCPTT client from the first broadcast control state to a third broadcast control state;

receiving an indication from the second MCPTT user to accept the broadcast call;

establishing a media session with the first MCPTT client based on the stored SDP body of the broadcast call; and

transitioning by the second MCPTT client from the third broadcast control state to the second broadcast control state.

9. The method of claim 6, wherein releasing the broadcast call with the first MCPTT client comprising:

receiving a group call broadcast end message comprising a call identifier information element (IE) same as a stored call identifier from the first MCPTT client;

releasing the broadcast call with the first MCPTT client; and

transitioning by the second MCPTT client from the second broadcast control state to the first broadcast control state after releasing the broadcast call.

10. The method of claim 6, wherein releasing the broadcast call with the first MCPTT client comprising:

receiving an indication from a second MCPTT user to release the broadcast call with the first MCPTT client;

transitioning by the second MCPTT client from the second broadcast control state to a fourth broadcast control state;

receiving a group call broadcast end message comprising a call identifier IE same as a stored call identifier from the first MCPTT client;

releasing the broadcast call with the first MCPTT client; and

transitioning by the second MCPTT client from the fourth broadcast control state to the first broadcast control state after releasing the broadcast call.

11. A method for managing mission critical push to talk (MCPTT) broadcast call between a first MCPTT client and a second MCPTT client in an off-network system, the method comprising:

receiving, by the second MCPTT client, a group call broadcast message broadcasted by a first MCPTT client;

determining, by the second MCPTT client, that a second MCPTT user acknowledgement is required;

initiating, by the second MCPTT client, a waiting for user timer; and

transitioning, by the second MCPTT client, from the first broadcast control state to a third broadcast control state.

12. The method of claim 11, wherein determining that the second MCPTT user acknowledgement is required comprising:

storing a value of the call identifier information element (IE) of the group call broadcast message as a call identifier of the broadcast call;

storing a value of a call type IE of a group call broadcast message as a received broadcast call type;

storing a value of a session descriptor (SDP) IE of the group call broadcast message as a SDP body of the broadcast call;

storing a value of an originating MCPTT user identifier IE of the group call broadcast message as an originating MCPTT user identifier of the broadcast call;

storing a value of a MCPTT group identifier IE of the group call broadcast message as a MCPTT group identifier of the broadcast call; and

determining that the second MCPTT user acknowledgement is required.

13. The method of claim 11, wherein the method further comprises:

receiving an indication from a second MCPTT user to reject the broadcast call;

terminating the waiting for user timer;

transitioning by the second MCPTT client from the third broadcast control state to a fourth broadcast control state;

receiving a group call broadcast end message comprising a call identifier information element (IE) same as a stored call identifier from the first MCPTT client; and

transitioning by the second MCPTT client from the fourth broadcast control state to the first broadcast control state.

14. The method of claim 11, wherein the method further comprises:

determining that the waiting for user timer is expired;

transitioning by the second MCPTT client from the third broadcast control state to a fourth broadcast control state;

receiving a group call broadcast end message comprising a call identifier information element (IE) same as a stored call identifier from the first MCPTT client; and

transitioning by the second MCPTT client from the fourth broadcast control state to the first broadcast control state.

15. A mission critical push to talk (MCPTT) system for managing MCPTT broadcast call in an off-network system, the MCPTT system comprising a MCPTT client configured to:

establish a broadcast call with, wherein the MCPTT client is transitioned from a first broadcast control state to a second broadcast control state after establishing the broadcast call; and

release the broadcast call, wherein the MCPTT client is transitioned from the second broadcast control state to the first broadcast control state after releasing the broadcast call.

16. The MCPTT system of claim 15, wherein the MCPTT client configured to establish the broadcast call by:

receiving an indication from a MCPTT user to initiate the broadcast call;

generating a session descriptor (SDP) body;

storing the generated SDP body as a SDP body of the broadcast call;

generating a random number with a uniform registration;

storing the generated random number as a call identifier of the broadcast call;

storing a MCPTT user identifier as an originating MCPTT user identifier of the broadcast call;

storing the broadcast call as a call type;

generating a group call broadcast message;

notifying a floor participant of a bearer priority;

broadcasting the group call broadcast message;

establishing a media session based on the SDP body of the broadcast call;

triggering a broadcast retransmission timer; and

transitioning by the MCPTT client from the first broadcast control state to the second broadcast control state.

17. The MCPTT system of claim 16, wherein in the group call broadcast message, the MCPTT client sets the call identifier information element (IE) to a stored call identifier of the broadcast call, sets a call type IE to a stored broadcast call type, sets an originating MCPTT user identifier IE to a stored originating MCPTT user identifier of the broadcast call, sets a MCPTT group identifier IE to a stored MCPTT group identifier of the broadcast call, and sets a SDP IE to a stored SDP body of the broadcast call.

18. The MCPTT system of claim 15, wherein the MCPTT client configured to release the broadcast call by:

receiving an indication from a MCPTT user to release the broadcast call;

releasing a media session established;

generating a group call broadcast end message;

broadcasting the group call broadcast end message;

terminating a broadcast retransmission timer; and

transitioning by the MCPTT client from the second broadcast control state to the first broadcast control state.

19. The MCPTT system of claim 18, wherein in the group call broadcast end message, the MCPTT client sets a call identifier information element (IE) to a stored call identifier of the broadcast call, sets an originating MCPTT user identifier IE to a stored originating MCPTT user identifier of the broadcast call, and sets a MCPTT group identifier IE to a stored MCPTT group identifier of the broadcast call.

20. A mission critical push to talk (MCPTT) system for managing MCPTT broadcast call in an off-network system, the MCPTT system comprising a MCPTT client configured to:

receive a group call broadcast message broadcasted by a user equipment (UE);

establish a broadcast call with the UE, wherein the MCPTT client is transitioned from a first broadcast control state to a second broadcast control state after establishing the broadcast call with the UE; and

release the broadcast call with the UE, wherein the MCPTT client is transitioned from the second broadcast control state to the first broadcast control state after releasing the broadcast call.

21. The MCPTT system of claim 20, wherein the MCPTT client configured to establish the broadcast call with the UE by:

storing a value of a call identifier information element (IE) of the group call broadcast message as a call identifier of the broadcast call;

storing a value of a call type IE of a group call broadcast message as a received broadcast call type;

storing a value of a session descriptor (SDP) IE of the group call broadcast message as a SDP body of the broadcast call;

storing a value of an originating MCPTT user identifier IE of the group call broadcast message as an originating MCPTT user identifier of the broadcast call;

storing a value of a MCPTT group identifier IE of the group call broadcast message as a MCPTT group identifier of the broadcast call;

determining that the MCPTT user acknowledgement is not required;

establishing a media session with the UE based on the stored SDP body of the broadcast call; and

transitioning by the MCPTT client from the first broadcast control state to the second broadcast control state.

22. The MCPTT system of claim 20, wherein the MCPTT client configured to establish the broadcast call with the UE by:

storing a value of a call identifier information element (IE) of the group call broadcast message as a call identifier of the broadcast call;

storing a value of a call type IE of a group call broadcast message as a received broadcast call type;

storing a value of a SDP IE of the group call broadcast message as a SDP body of the broadcast call;

storing a value of an originating MCPTT user identifier IE of the group call broadcast message as an originating MCPTT user identifier of the broadcast call;

storing a value of a MCPTT group identifier IE of the group call broadcast message as a MCPTT group identifier of the broadcast call;

determining that the second MCPTT user acknowledgement is required;

initiating a waiting for user timer;

transitioning by the MCPTT client from the first broadcast control state to a third broadcast control state;

receiving an indication from the MCPTT user to accept the broadcast call;

establishing a media session with the UE based on the stored SDP body of the broadcast call; and

transitioning by the MCPTT client from the third broadcast control state to the second broadcast control state.

23. The MCPTT system of claim 20, wherein the MCPTT client configured to release the broadcast call with the UE by:

receiving a group call broadcast end message comprising a call identifier information element (IE) same as a stored call identifier from the UE;

releasing the broadcast call with the UE; and

transitioning by the MCPTT client from the second broadcast control state to the first broadcast control state after releasing the broadcast call.

24. The MCPTT system of claim 20, wherein the MCPTT client configured to release the broadcast call with the UE by:

receiving an indication from a MCPTT user to release the broadcast call with the UE;

transitioning by the MCPTT client from the second broadcast control state to a fourth broadcast control state;

receiving a group call broadcast end message comprising a call identifier information element (IE) same as a stored call identifier from the UE;

releasing the broadcast call with the UE; and

transitioning by the MCPTT client from the fourth broadcast control state to the first broadcast control state after releasing the broadcast call.

25. A critical push to talk (MCPTT) system for managing mission MCPTT broadcast call in an off-network system, the MCPTT system comprising a MCPTT client configured to:

receive a group call broadcast message broadcasted by a user equipment (UE);

determine that a MCPTT user acknowledgement is required;

initiate a waiting for user timer; and

transition from the first broadcast control state to a third broadcast control state.

26. The MCPTT system of claim 25, wherein the MCPTT client configured to determine that the MCPTT user acknowledgement is required by:

storing a value of the call identifier information element (IE) of the group call broadcast message as a call identifier of the broadcast call;

storing a value of a call type IE of a group call broadcast message as a received broadcast call type;

storing a value of a session descriptor (SDP) IE of the group call broadcast message as a SDP body of the broadcast call;

storing a value of an originating MCPTT user identifier IE of the group call broadcast message as an originating MCPTT user identifier of the broadcast call;

storing a value of a MCPTT group identifier IE of the group call broadcast message as a MCPTT group identifier of the broadcast call; and

determining that the MCPTT user acknowledgement is required.

27. The method of claim 25, wherein the MCPTT client further configured to:

receive an indication from a MCPTT user to reject the broadcast call;

terminate the waiting for user timer;

transition from the third broadcast control state to a fourth broadcast control state;

receive a group call broadcast end message comprising a call identifier information element (IE) same as a stored call identifier from the UE; and

transition from the fourth broadcast control state to the first broadcast control state.

28. The MCPTT system of claim 25, wherein the MCPTT client further configured to:

determine that the waiting for user timer is expired;

transition from the third broadcast control state to a fourth broadcast control state;

receive a group call broadcast end message comprising a call identifier information element (IE) same as a stored call identifier from the UE; and

transition from the fourth broadcast control state to the first broadcast control state.