# US 8,542,633 B2 · Admission control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,542,633 B2 - Document ID: US8542633B2 - Status: Granted - Kind: B2 - Application number: 12/838,709 - Filed: 2010-07-19 - Published: 2012-01-19 - Granted: 2013-09-24 - Earliest claimed: 2010-07-19 - Assignees: Telefonaktiebolaget L M Ericsson (publ) - Applicants: Markus Drevö - Inventors: Markus Drevö - Web page: https://patentgrep.com/patent/US8542633B2 ## CPC - H04L 1/203: {Details of error rate determination, e.g. BER, FER or WER} - H04W 76/40: for selective distribution or broadcast - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04W 28/18: Negotiating wireless communication parameters - H04W 28/22: Negotiating communication rate - H04W 76/18: Management of setup rejection or failure - 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 network node and a method in a network node for admission control of broadcast transmission sessions. The method comprises receiving a broadcast transmission session start request for a first broadcast transmission session, obtaining at least a first traffic statistics parameter related to said first broadcast transmission session, obtaining the available bit rate for the broadcast transmission area, and obtaining a re-synchronization parameter indicating the time between re-synchronization of transmissions for said broadcast transmission session. The method also calculates a first expected bit error rate based on said at least first traffic statistics parameter, said available bit rate and said re-synchronization parameter, and admits said first broadcast transmission session if said first expected bit error rate is less than a first bit error rate threshold. ## Claims ### Claim 1 A method in a network node for admission control of broadcast transmission sessions in a broadcast transmission area, the method comprising: receiving a broadcast transmission session start request for a first broadcast transmission session, obtaining at least a first traffic statistics parameter related to said first broadcast transmission session, obtaining an available bit rate for the broadcast transmission area, obtaining a re-synchronization parameter indicating a time between re-synchronization of transmissions for said first broadcast transmission session, calculating a first expected bit error rate based on said at least first traffic statistics parameter, said available bit rate and said re-synchronization parameter, wherein said first expected bit error rate is calculated by estimating an average number of bits remaining in a transmit buffer for said first broadcast transmission session at re-synchronization using said at least first traffic statistics parameter and dividing by an estimated number of transmitted bits for said first broadcast transmission session during the time between re-synchronization, and admitting said first broadcast transmission session if said first expected bit error rate is less than a first bit error rate threshold. ### Claim 2 (depends on 1) The method according to claim 1, wherein said at least a first traffic statistics parameter comprises a mean value indicating an expected average amount of received bits per time interval and a standard deviation of said mean value. ### Claim 3 (depends on 1) The method according to claim 1, wherein said at least a first traffic statistics parameter comprises an indication of traffic distribution selected from a group of traffic distributions comprising a normal distribution, an exponential distribution, a flat distribution, a triangle distribution, or a discrete normal distribution. ### Claim 4 (depends on 1) The method according to claim 1, wherein said broadcast transmission sessions are Multimedia Broadcast Multicast Service (MBMS) sessions, and said broadcast transmission area is a MBMS Single Frequency Network (MBFSN) area. ### Claim 5 (depends on 1) The method according to claim 1, wherein said broadcast transmission area includes different radio cells controlled by different radio base stations. ### Claim 6 (depends on 1) The method according to claim 1, wherein resynchronizations are scheduled at regular intervals. ### Claim 7 (depends on 1) The method according to claim 1, the method further comprising: obtaining a quality of service class identifier associated with said first broadcast transmission session, and obtaining from said quality of service class identifier a maximum bit error loss rate, wherein said first bit error rate threshold is based on said maximum bit error loss rate. ### Claim 8 (depends on 1) The method according to claim 1, wherein said traffic statistics parameter includes a Guaranteed Bit Rate and a Maximum Bit Rate for the Broadcast session. ### Claim 9 (depends on 8) The method according to claim 8, wherein an average bit rate for the broadcast session is estimated to be equal to the Guaranteed Bit Rate, and a standard deviation for the broadcast session is estimated to be equal to (Maximum Bit Rate-Guaranteed Bit Rate)/2. ### Claim 10 (depends on 1) The method according to claim 1, wherein said traffic statistics parameter is a Guaranteed Bit Rate and a Maximum Bit Rate for the Broadcast session. ### Claim 11 A method in a network node for admission control of broadcast transmission sessions in a broadcast transmission area, the method comprising: receiving a broadcast transmission session start request for a first broadcast transmission session, obtaining at least a first traffic statistics parameter related to said first broadcast transmission session, obtaining an available bit rate for the broadcast transmission area, obtaining a re-synchronization parameter indicating a time between re-synchronization of transmissions for said first broadcast transmission session, calculating a first expected bit error rate based on said at least first traffic statistics parameter, said available bit rate and said re-synchronization parameter, admitting said first broadcast transmission session if said first expected bit error rate is less than a first bit error rate threshold, receiving a broadcast transmission session start request for a second broadcast transmission session, obtaining at least a second traffic statistics parameter related to said second broadcast transmission session, re-calculating said first expected bit error rate based on said at least first and second traffic statistics parameter, said available bit rate and said re-synchronization parameter, calculating a second expected bit error rate based on said at least first and second traffic statistics parameter, said available bit rate and said re-synchronization parameter, and admitting said second broadcast transmission session if said re-calculated first expected bit error rate is less than said first bit error rate threshold and said at least second expected bit error rate is less than a second bit error rate threshold. ### Claim 12 (depends on 11) The method according to claim 11, wherein said first expected bit error rate is calculated by estimating an average number of bits remaining in a transmit buffer for said first broadcast transmission session at re-synchronization using said at least first traffic statistics parameter and dividing by an estimated number of transmitted bits for said first broadcast transmission session during the time between re-synchronization. ### Claim 13 (depends on 11) The method according to claim 11, wherein each of said at least first traffic statistic parameter and said at least second traffic statistics parameter comprises an indication of traffic distribution comprising a normal distribution, an exponential distribution, a flat distribution, a triangle distribution, or a discrete normal distribution. ### Claim 14 (depends on 11) The method according to claim 11, wherein each of said at least first traffic statistics parameter and said at least second traffic statistics parameter comprises a mean value indicating an expected average amount of received bits per time interval and a standard deviation of said mean value. ### Claim 15 (depends on 1) A network node adapted to perform admission control of broadcast transmission sessions comprising processing hardware configured to execute the method as specified in claim 1. ### Claim 16 (depends on 15) The network node according to claim 15, wherein said network node is a Multi-cell/Multicast Coordination Entity (MCE).