# US 10,374,817 B2 · Method for handling of unknown LCID values in a multicast channel in a wireless communication system and a device therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,817 B2 - Document ID: US10374817B2 - Status: Granted - Kind: B2 - Application number: 15/562,097 - Filed: 2016-03-15 - Published: 2018-03-15 - Granted: 2019-08-06 - Earliest claimed: 2015-04-07 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Seungjune Yi; Sunyoung Lee - Web page: https://patentgrep.com/patent/US10374817B2 ## CPC - H04L 12/1859: {adapted to provide push services, e.g. data channels} - H04L 12/189: {in combination with wireless systems (selective distribution or broadcast in wireless communication networks H04W4/06)} - H04W 56/001: {Synchronization between nodes} - H04W 72/30: Resource management for broadcast services - H04W 76/40: for selective distribution or broadcast - H04W 80/02: Data link layer protocols - H04W 88/08: Access point devices - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for handling of unknown LCID values in a Multicast Channel in a wireless communication system, the method comprising: receiving a MAC PDU including at least one LCID on MCH; discarding a header field containing a first LCID and a corresponding MAC SDU indicated by the header field in the received MAC PDU if the UE does not join an MBMS service transmitted on a MTCH identified by the first LCID currently; and processing remaining parts of the MAC PDU after the header field and the corresponding MAC SDU are discarded from the MAC PDU. ## Claims ### Claim 1 A method for a User Equipment (UE) operating in a wireless communication system, the method comprising: receiving a Medium Access Control (MAC) Protocol Data Unit (PDU) including a first Logical Channel Identifier (LCID) and a MAC Service Data Unit (SDU) related to the first LCID on a Multicast Channel (MCH); determining that the first LCID is not one of a plurality of reserved values on the MCH; checking whether the UE has joined a Multimedia Broadcast Multicast Service (MBMS) service transmitted on a Multicast Traffic Channel (MTCH) identified by the first LCID; discarding a sub-header field including the first LCID and the MAC SDU related to the first LCID in the received MAC PDU, when the first LCID identifies an MTCH, on which an MBMS service that the UE did not join, is transmitted; and processing parts of the MAC PDU, other than the sub-header field and the MAC SDU discarded from the MAC PDU. ### Claim 2 (depends on 1) The method according to claim 1, wherein a value of the first LCID is one of a plurality of LCID values allocated for a Multicast Traffic Channel (MTCH). ### Claim 3 (depends on 1) The method according to claim 1, wherein a value of the first LCID is one of 00001 to 11100. ### Claim 4 A method for a User Equipment (UE) operating in a wireless communication system, the method comprising: receiving a Medium Access Control (MAC) Control Element (CE) including a first Logical Channel Identifier (LCID) on a Multicast Channel (MCH); determining that the first LCID is not one of a plurality of reserved values on the MCH; checking whether the UE has joined a Multimedia Broadcast Multicast Service (MBMS) service transmitted on a Multicast Traffic Channel (MTCH) identified by the first LCID; discarding at least one field related to the first LCID in the MAC CE, when the first LCID identifies an MTCH, on which an MBMS service that the UE did not join, is transmitted; and processing remaining parts of the MAC CE, other than the at least one field related to the LCID discarded from the MAC CE. ### Claim 5 (depends on 4) The method according to claim 4, wherein the at least one field related with the first LCID includes an LCID field related to the first LCID, a stop MTCH field related to the first LCID, and a suspended field related to the first LCID. ### Claim 6 (depends on 4) The method according to claim 4, wherein a value of the first LCID is one of a plurality of LCID values allocated for Multicast Traffic Channel (MTCH). ### Claim 7 (depends on 4) The method according to claim 4, wherein a value of the first LCID is one of 00001 to 11100. ### Claim 8 (depends on 4) The method according to claim 4, wherein the UE doesn't monitor the MCH during a time period when the MBMS service, that the UE doesn't join, is transmitted on the MTCH identified by the first LCID. ### Claim 9 (depends on 8) The method according to claim 8, wherein the time period is informed by an MCH Scheduling Information (MSI) MAC CE or an Extended MCH Scheduling Information (E-MSI) MAC CE. ### Claim 10 A User Equipment (UE) operating in a wireless communication system, the UE comprising: a receiver and a transmitter; and a processor, operably coupled to the receiver and the transmitter, wherein the processor is configured to: receive a Medium Access Control (MAC) Protocol Data Unit (PDU) including a first Logical Channel Identifier (LCID) and a MAC Service Data Unit (SDU) related to the first LCID on a Multicast Channel (MCH), determine that the first LCID is not one of a plurality of reserved values on the MCH, check whether the UE has joined a Multimedia Broadcast Multicast Service (MBMS) service transmitted on a Multicast Traffic Channel (MTCH) identified by the first LCID, discard a sub-header field including the first LCID and a MAC SDU related to the first LCID in the received MAC PDU, when the first LCID identifies an MTCH, on which an MBMS service that the UE did not join, is transmitted; and process parts of the MAC PDU, other than the sub-header field and the MAC SDU discarded from the MAC PDU. ### Claim 11 (depends on 10) The UE according to claim 10, wherein a value of the first LCID is one of a plurality of LCID values allocated for a Multicast Traffic Channel (MTCH). ### Claim 12 (depends on 10) The UE according to claim 10, wherein a value of the first LCID is one of 00001 to 11100.