Prosecution Insights
Last updated: October 02, 2026
Application No. 18/502,134

METHOD OF ESTABLISHING MULTICAST BROADCAST SERVICE SESSION, AND SYSTEM AND APPARATUS THEREOF

Non-Final OA §103
Filed
Nov 06, 2023
Priority
May 07, 2021 — continuation of PCTCN2021092109
Examiner
BUKHARI, SIBTE H
Art Unit
2449
Tech Center
2400 — Computer Networks
Assignee
ZTE Corporation
OA Round
3 (Non-Final)
79%
Grant Probability
Favorable
3-4
OA Rounds
3m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 79% — above average
79%
Career Allowance Rate
347 granted / 440 resolved
+20.9% vs TC avg
Strong +36% interview lift
Without
With
+35.9%
Interview Lift
resolved cases with interview
Typical timeline
3y 1m
Avg Prosecution
21 currently pending
Career history
460
Total Applications
across all art units

Statute-Specific Performance

§101
9.8%
-30.2% vs TC avg
§103
66.1%
+26.1% vs TC avg
§102
10.4%
-29.6% vs TC avg
§112
9.4%
-30.6% vs TC avg
Black line = Tech Center average estimate • Based on career data from 440 resolved cases

Office Action

§103
DETAILED ACTION Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Status of Claims This action is in response to application filed on 7/6/2026. Claims 1, 5-6, 10 & 14 have been examined and are pending with this action. Priority Examiner acknowledges that the Applicant claims a priority benefit of PCT/CN2021/092109 filed on 5/17/2021. Arguments Applicant arguments are not persuasive based on the following arguments. Applicant: Applicant argues that PA doesn’t disclose wherein the one or more devices of the second multicast domain include one or more network devices Examiner: Examiner cites Xiong that discloses the amended limitation Xiong in general discloses wherein the location information comprises at least one of a tracking area identity list associated with the area identifier [(XIONG): “ such as information related to UE location, tracking area identifier (TrackingAreaIdentity, TAI), globally unique AMF identifier (Globally UniqueAMF Identifier (GUAMI)”)], a cell list associated with the area identifier or a multicast address associated with the area identifier [(XIONG): such as information related to UE location, such as Cell Global Identifier (Cell Global Identifier, CGI) & the MBSF entity can send the second request to the corresponding PCF entity according to the MB-SMF ID, the second request may include TMGI corresponding to the multicast/broadcast service, MB-SMF ID list, information of at least one data stream corresponding to the multicast/broadcast service]. Xiong is general disclosers a session management function entity and a Multicast/Broadcast Service Function (MBSF) entity 203 is disclosed in figure 2. The limitation under argument discloses a tracking are functionality which is being interpreted by TAI (TrackingAreaIdentity) disclosed by Xiong. Also Xiong discloses a cell list associated with the area identifier or a multicast address associated with the area identifier [(XIONG): such as information related to UE location, such as Cell Global Identifier (Cell Global Identifier, CGI) . So all the key element s of the limitation are disclosed by the provided art in configuration claimed in the limitation. Hence the argument proposed by Applicant are not persuasive. Claim Rejections - 35 USC § 103 The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102 of this title, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. Claim 1, 5-6, 10 & 14 are rejected under 35 U.S.C. 103 as being unpatentable over XIONG (CN # 111556539) in view of Dao et al (US Pub # 2021/0105196). INDEPENDENT CLAIMS: As per claim 1, XIONG discloses a wireless communication method for use in a wireless network node [(XIONG): “ the multicast/broadcast service, wherein FIG. 8 is a schematic flow of activating the multicast service based on the first activation mode in the wireless communication system”] , the wireless communication method comprising: Receiving, by the wireless network node, from a session management function [(XIONG): wherein receiving from the first type session management function entity for activating the user device multicast service.”] , a session response comprising an area identifier of a multicast broadcast service (MBS) session and location information corresponding to the area identifier [(XIONG): “ the first type SMF (session management function) entity may also send other information to the determined MBSF (Multiple broadcast session function) entity, such as information related to UE location, such as Cell Global Identifier (Cell Global Identifier, CGI), tracking area identifier (TrackingAreaIdentity, TAI), globally unique AMF identifier (Globally UniqueAMF Identifier (GUAMI)”)]. transmitting, by the wireless node, to a multicast broadcast session management function of the MBS session [(XIONG): “ user plane tunnel transmitting the MBSU entity to be sent to the MB UPF entity data (e.g., service data corresponding to the multicast/broadcast service). ”], wherein the location information comprises at least one of a tracking area identity list associated with the area identifier [(XIONG): “ such as information related to UE location, tracking area identifier (TrackingAreaIdentity, TAI), globally unique AMF identifier (Globally UniqueAMF Identifier (GUAMI)”)], a cell list associated with the area identifier or a multicast address associated with the area identifier [(XIONG): such as information related to UE location, such as Cell Global Identifier (Cell Global Identifier, CGI) & the MBSF entity can send the second request to the corresponding PCF entity according to the MB-SMF ID, the second request may include TMGI corresponding to the multicast/broadcast service, MB-SMF ID list, information of at least one data stream corresponding to the multicast/broadcast service]. XIONG does not explicitly teaches establishing a downlink tunnel. Dao however discloses a request [(Dao) :[0519] “ an N4 MB session modification request comprising downlink DL tunnel”) of establishing a downlink tunnel for the MBS session, wherein the message comprises the area identifier [(Dao) :[0519] “ a message indicating confirmation of establishment of the MB session, the message comprising RAN tunnel information including RAN address and downlink (DL) N3 tunnel identifier (TEID).”]. Therefore it would have been obvious for one of ordinary skill in the art before the effective filing date of the claimed invention to modify the system of XIONG in view of Dao to figure out establishing a downlink tunnel. One would be motivated to do so because this enhances the system for group communications with shared downlink data. (Dao: [ABs]). Claim 6 and 10 are rejected based on rationale provided from claim 1 rejection. DEPENDENT CLAIMS: As per claim 5, XIONG/Dao discloses the wireless communication method of claim 3 [(XIONG): “ the multicast/broadcast service, wherein FIG. 8 is a schematic flow of activating the multicast service based on the first activation mode in the wireless communication system”], further comprising: receiving, from the multicast broadcast session management function [(XIONG): wherein receiving from the first type session management function entity for activating the user device multicast service.”], a response comprising a multicast address [(XIONG): the IP multicast address can identify a specific one multicast service; .”], associated with the area identifier [(XIONG): “ other information to the determined MBSF (Multiple broadcast session function) entity, such as information related to UE location tracking area identifier (TrackingAreaIdentity, TAI),”)]. Claim 14 is rejected based on rationale provided from claim 5 rejection. Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. This includes: Any inquiry concerning this communication or earlier communications from the examiner should be directed to Sibte Bukhari whose telephone number is (571) 270-7122. The examiner can normally be reached on M-F 9:00 - 6:00. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Vivek Srivastava can be reached on (571) 272-7304. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of an application may be obtained from the Patent Application Information Retrieval (PAIR) system. Status information for published applications may be obtained from either Private PAIR or Public PAIR. Status information for unpublished applications is available through Private PAIR only. For more information about the PAIR system, see http://pair-direct.uspto.gov. Should you have questions on access to the Private PAIR system, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative or access to the automated information system, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /SIBTE H BUKHARI/Examiner, Art Unit 2449
Read full office action

Prosecution Timeline

Nov 06, 2023
Application Filed
Nov 07, 2025
Non-Final Rejection (signed) — §103
Dec 10, 2025
Non-Final Rejection mailed — §103
Mar 10, 2026
Response Filed
May 05, 2026
Final Rejection mailed — §103
Jul 06, 2026
Request for Continued Examination
Jul 10, 2026
Response after Non-Final Action
Jul 15, 2026
Non-Final Rejection mailed — §103 (current)

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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

3-4
Expected OA Rounds
79%
Grant Probability
99%
With Interview (+35.9%)
3y 1m (~3m remaining)
Median Time to Grant
High
PTA Risk
Based on 440 resolved cases by this examiner. Grant probability derived from career allowance rate.

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