US 20070189162A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2007/0189162 A1 Song et al. (43) Pub. Date: Aug. 16, 2007 (54) METHOD FOR SETTING MULTICAST AND (30) Foreign Application Priority Data BROADCAST SERVICE IN BROADBAND WIRELESS ACCESS SYSTEM Feb. 15, 2006 (KR) ............... .. 2006-14858 Publication Classi?cation (75) Inventors: KWan-Woong Song, Seoul (KR); Yong-Deok Kim, Seoul (KR); (51) Int. Cl. Young-Hun J 00, Yongin-si (KR); H04L 12/26 (2006.01) Han-Sang Kim, Yeongtong-gu (52) us. c1. ..................................................... .. 370/230 (KR) (57) ABSTRACT Correspondence Address: A method for setting a multicast and broadcast service CHA & REITER, LLC (MBS) of a broadband Wireless access system includes: 210 ROUTE 4 EAST STE 103 previously receiving and storing the information on the PARAMUS, NJ 07652 MBS setting from a MBS server by a radio access station; and broadcasting the information on the MBS setting stored Assignee: Samsung Electronics Co., LTD in the PSS, Which exists in the service area of the radio (73) access station, by the radio access station. In the step of broadcasting the information on the MBS setting, a preset (21) Appl. No.: 11/636,832 pilot tone, uplink/doWnlink information, or the sub-carriers unused in bandwidth of the system are used for broadcasting (22) Filed: Dec. 11, 2006 the information. INTERNET PROTOCOL ’ NETWORK El MULTICAST81 BROADCAST. I‘ x; SERVICE SERVER ACR Patent Application Publication Aug. 16, 2007 Sheet 1 0f 5 US 2007/0189162 A1 . PORTABLE RADIO MULTICAST & SUBSCRIBER ACCESS BROADCAST STATION (PS3) STATIONS (RAS) SERVICE SERVER 101 Go to Awake Mode (If PS8 is in Idle Mode) Content Sen/er Discovery (102) HTTP Request (List) (103) HTTP Response (MBS Contents List)(i04) eoro idle Mode . v(Ii needed) ~105 Go to Awake Mode 7 ‘ _1O6 ' (II PS8 is in Idle Mode) 7 DSA-REQ (Multicast I IP Address, Port) (107) osx-Rvo '(1 O8) DSA-RSP (DoWnIink'Service' AutnenticationProcess (109): \ ' . Parameters, MBS Zone Identifier) (i1) v PKM—REQ (Key Request) (I 1 I) Authorization and Accounting Process (112) PKM-FISP (Key Response) (1 13) I MBS Packet (Multicast CID) ' Q ‘ Go to Idle Mode I (if needed) 'RFIGJ (PRIOR ART) ‘ Patent Application Publication Aug. 16, 2007 Sheet 2 0f 5 US 2007/0189162 A1 INT ET PRO I OL ‘ ETWOR IMULTICASTéi AD T‘ _SERVICE VE _ Patent Application Publication Aug. 16, 2007 Sheet 3 0f 5 US 2007/0189162 A1 PORTABLE - nAoio MULT|CAST& - ‘ SUBSCRIBER ACCESS BROADCAST STATION '(PSS) STATIONS IRAS) SERVICE SERVER 301 .' 1 HTTP transmission (300i ' Go to Awake Mode ' (II PS8 is in Idle Mode) '_ HTTP broadca‘sting ' (contents list) (302) .. GotoidleMode U I eilfneeded) t 303. DSA-REQ (304) DSX-RVDI305) ( Authentication Proces's_(306) f DSA-RSP (307) v ) PKM-REQ‘ 7 ‘(Key request) (308) Authorization and . Accounting Process (309) PKM-REQ (Key Request) (310) - ' Mes Packet PIG?) Patent Application Publication Aug. 16, 2007 Sheet 5 0f 5 US 2007/0189162 A1 48i. ‘ iv. SimN12 5am52323m;22N . 6256205293525mm;6025%55 . 3E US 2007/0189162 A1 Aug. 16,2007 METHOD FOR SETTING MULTICAST AND taneously saving resources and providing existing data ser BROADCAST SERVICE IN BROADBAND vice. The multicast is also applied to the IEEE 802.16d/e WIRELESS ACCESS SYSTEM standard in order to ef?ciently use the resources and various service media in the mobile communication system for CLAIM OF PRIORITY high-speed data transmission. [0001] This application claims priority to an application [0009] Thus, the broadband wireless access system entitled “Method For Setting Multicast and Broadcast Ser according to the IEEE 802.16d/e may provide the multicast vice In Broadband Wireless Access System,” ?led with the and broadcast service (MBS), and an MBS server providing Korean Intellectual Property Of?ce on Feb. 15, 2006 and the MBS takes precedence over Access Control Router assigned Serial No. 2006-14858, the contents of which are (ACR). The MBS server plays roles of transmitting the MBS incorporated herein by reference. information to the PSS, authenticating the service, acquiring the encryption key, and accounting tasks. BACKGROUND OF THE INVENTION [0010] FIG. 1 shows the ?ow of signals and access meth [0002] 1. Field of the Invention ods when the PSS accesses the MBS server. More particu [0003] The present invention relates to a broadband wire larly, FIG. 1 is a ?owchart illustrating the operation of less access system such as Wireless Broadband (WiBro), and setting for MBS in a WiBro system. Referring to FIG. 1, more particularly to signal regulations between a Multicast ?rst, when a portable subscriber station (PSS) goes to an and Broadcast service (MBS) server and a portable sub awake mode (step 101), the PSS and radio access station scriber station (PSS) and its related communication proto generally search for the MBS server by using a dynamic host col. con?guration protocol (DHCP, step 102). Then, the PSS [0004] 2. Description of the Related Art requests the contents list to the searched MBS server (step [0005] Abroadband wireless access system such as WiBro 103) and receives the contents list from the MBS server (step transmit wireless data using an Orthogonal Frequency Divi 104). sion Multiple Access/Time Division Duplex (OFDMA/ [0011] A contents list includes a title of MBS contents TDD) scheme based on Internet Protocol (IP), which pro related to the broadcast to watch, multicast IP addresses, port vides uplink and downlink asymmetric transmission to support low and high speed various data service, including numbers, MBS identi?er (ID), MBS Connection ID (CID), a multimedia application service for providing high de?ni and MBS Zone identi?er. tion moving pictures, a voice service. Such a broadband [0012] Then, the PSS enters in an idle mode and can go to wireless access system is based on wireless media using a the awake mode again (steps 105 and 106). The PSS requests broadband, such as 2 GHZ, 5 GHZ, 26 GHZ, and 60 GHZ, a broadcast service watch to the radio access station (step etc., which may access Public Switched Telephone Network 107) by transmitting the dynamic service addition (DSA) (PSTN), Public Switched Data Network (PSDN), Internet, request (REQ) message set in advance to the radio access and International Mobile Telecommunication-2000 (IMT station. The DSA-REQ message includes an IP address, a 2000) Network, etc., and may support a channel transmis port number and the like, of the multicast which a user wants sion rate of more than 2 Mbps. to watch. [0006] The 802.16 standardization group of the Institute of [0013] The radio access station transmits the receipt noti Electrical and Electronics Engineers (IEEE) has standard ?cation message of the DSA-REQ, in other words, a DSx iZed a wireless access scheme for the broadband wireless xxx-Received (DSX-RVD) message to the PSS (step 108), access system and has propelled the establishment of the and then processes the authentication with MBS server (step IEEE 802.16d and IEEE 802.16e standards as standards for providing the broadband wireless access service for ?xed or 109). Continuously, the radio access station transmits the portable subscriber stations (PSS) to date. MBS Zone identi?er and the downlink information such as [0007] In the broadband wireless access system based on lower layer information, which is necessary for a corre the IEEE 802.16e standard, when a PSS transmits data in a sponding physical layer and medium access control (MAC) unicast scheme, the PSS uses a Traf?c Encryption Key layer (step 110), using the ‘DSA-RSP’ message. (TEK) received through Privacy Key Management (PKM) [0014] The PSS, which has received the lower layer infor in order to encrypt data. The TEK is applied to a speci?c mation suitable for the broadcast, transmits the PKM key connection to encipher tra?ic during the valid time of the request message (PKM-REQ) to the radio access station TEK using an encryption algorithm de?ned by IEEE 802.16 (step 111). As a result, the radio access station performs the Privacy Sublayer and Initialization Vector (IV), which is authoriZation and accounting with the MBS server (step 112) used for encryption. and transmits the PKM key response message (PKM-RSP) [0008] Meanwhile, as described above, IEEE 802.16d/e to the PSS (step 113). The PSS receives the MBS packet standard de?nes the unicast scheme in which communica from MBS server through the radio access station and tion with a PSS is carried out to transmit packet data. That decodes the broadcasting traf?c encoded by the radio access is, the data sending and receiving are performed by appoint station to view the MBS packet. ing a speci?c user’s address, and a service is supplied to the [0015] As illustrated in FIG. 1, the PSS may access the corresponding user in an access network by allocating the MBS server for MBS. However, as described above, at band for data transmission. However, the unicast scheme initial access, the PSS carries out a step of acquiring the will cause waste of resources and undesirable load of system MBS contents list from the MBS server through uplink in a network and wireless communication sections if the signals to the MBS and identifying the MBS contents list. At same data is transmitted to multiple users at the same time. this moment, it takes many routes to transmit from the initial Therefore, a multicast scheme has been developed for simul signal which the PSS generates to the contents list for MBS, US 2007/0189162 A1 Aug. 16,2007 and these signals are treated as generic communication data, cast service (MBS), provides MBS contents list to the PSS and thus results in the waste of bandwidth between the radio requiring MBS and plays roles in authenticating the PSS access station and the PSS.