# US 8,543,125 B2 · Method and arrangement in a wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,543,125 B2 - Document ID: US8543125B2 - Status: Granted - Kind: B2 - Application number: 13/380,401 - Filed: 2010-02-02 - Published: 2012-04-26 - Granted: 2013-09-24 - Earliest claimed: 2009-06-29 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Riika Susitaival; Stefan Wager; Jessica Ostergaard - Inventors: Riika Susitaival; Stefan Wager; Jessica Ostergaard - Web page: https://patentgrep.com/patent/US8543125B2 ## CPC - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04L 1/188: {Time-out mechanisms} - H04W 72/04: Wireless resource allocation - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 74/085: {collision avoidance} - H04W 88/02: Terminal devices - H04W 88/08: Access point devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method in a user equipment for transmitting scheduling requests to a base station includes triggering a scheduling request transmission and transmitting a scheduling request to the base station at the next occurring scheduling request opportunity as a response to the triggering. The method also includes starting a scheduling request prohibiting timer in the user equipment when the scheduling request is transmitted to the base station and prohibiting any further scheduling request retransmission at future scheduling request opportunities while the scheduling request prohibiting timer is running. ## Claims ### Claim 1 A method in a user equipment for transmitting scheduling requests to a base station, the base station is adapted to serve the user equipment, the user equipment is configured to transmit scheduling requests to the base station only at certain predetermined scheduling request opportunities, the method comprising: triggering a scheduling request transmission; transmitting a scheduling request to the base station at the next occurring scheduling request opportunity as a response to the triggering; starting a scheduling request prohibiting timer, comprised in the user equipment, when the scheduling request is transmitted to the base station; and prohibiting any further scheduling request retransmission at future scheduling request opportunities while the scheduling request prohibiting timer is running, wherein the scheduling request prohibiting timer is configured with a scheduling request prohibiting timer length which is equal to a time between two scheduling request opportunities multiplied by a factor k, wherein k is a positive integer. ### Claim 2 (depends on 1) The method according to claim 1, comprising the further step of: stopping the scheduling request prohibiting timer when the scheduling request transmission trigger is cancelled or when the scheduling request prohibiting timer is expired. ### Claim 3 (depends on 1) The method according to claim 1, comprising the further step, to be performed before the other steps: configuring the scheduling request prohibiting timer with a scheduling request prohibiting timer length, such that the scheduling request prohibiting timer expires when the configured scheduling request prohibiting timer length has passed, after having started the scheduling request prohibiting timer. ### Claim 4 (depends on 1) The method according to claim 1, wherein the scheduling request prohibiting timer is configured to a fixed scheduling request prohibiting timer length. ### Claim 5 (depends on 1) The method according to claim 1, wherein the factor k is received from the base station. ### Claim 6 (depends on 1) The method according to claim 1, wherein the factor k is ranging between zero and infinity such that: k=[0,1, . . . , ∞], further comprising receiving the factor k via Radio Resource Control (RRC) from the base station, and wherein the Scheduling Request is transmitted on a Physical Uplink Control Channel (PUCCH). ### Claim 7 An apparatus for transmitting scheduling requests to a base station adapted to serve the user equipment, wherein the apparatus is configured to transmit scheduling requests to the base station only at certain predetermined scheduling request opportunities, the apparatus comprising: a scheduling request transmission trigger, configured to trigger a scheduling request transmission; a transmitter, configured to transmit a scheduling request to the base station at the next occurring scheduling request opportunity as a response to the triggered scheduling request transmission; and a scheduling request prohibiting timer, configured to start when the scheduling request is transmitted first time and to prohibit any further scheduling request retransmission at future scheduling request opportunities while the scheduling request prohibiting timer is running, wherein the scheduling request prohibiting timer is configured with a scheduling request prohibiting timer length which is equal to a time between two scheduling request opportunities multiplied by a factor k, wherein k is a positive integer. ### Claim 8 A method in a base station for assisting a user equipment in transmitting scheduling requests to the base station, the base station is adapted to serve the user equipment, the user equipment is configured to transmit scheduling requests to the base station only at certain predetermined scheduling request opportunities, the method comprising: determining a factor k, wherein k is a positive integer, to be transmitted to the user equipment, enabling the user equipment to calculate a scheduling request prohibiting timer length; transmitting the determined factor k to the user equipment; receiving scheduling requests from the user equipment, wherein each scheduling request is separated from a subsequent scheduling request by an amount of time at least equal to a time between two scheduling request opportunities multiplied by the factor k; and scheduling the user equipment in response to one or more of the received scheduling requests. ### Claim 9 An apparatus for assisting a user equipment in transmitting scheduling requests to a base station adapted to serve the user equipment, the user equipment is configured to transmit scheduling requests to the base station only at certain predetermined scheduling request opportunities, the apparatus comprising: a determination unit, configured to determine a factor k, wherein k is a positive integer, to be transmitted to the user equipment in order for the user equipment to calculate a scheduling request prohibiting timer length; a transmitter, configured to transmit the determined factor k to the user equipment; a receiver configured to receive scheduling requests from the user equipment, wherein each scheduling request is separated from a subsequent scheduling request by an amount of time at least equal to a time between two scheduling request opportunities multiplied by the factor k; and a scheduler, configured to schedule the user equipment in response to one or more of the received scheduling requests. ### Claim 10 (depends on 7) The apparatus according to claim 7, wherein the apparatus is configured to stop the scheduling request prohibiting timer when the scheduling request transmission trigger is cancelled or when the scheduling request prohibiting timer is expired. ### Claim 11 (depends on 7) The apparatus according to claim 7, wherein the apparatus is further configured to configure the scheduling request prohibiting timer with a scheduling request prohibiting timer length, such that the scheduling request prohibiting timer expires when the configured scheduling request prohibiting timer length has passed, after having started the scheduling request prohibiting timer. ### Claim 12 (depends on 7) The apparatus according to claim 7, wherein the scheduling request prohibiting timer is configured to a fixed scheduling request prohibiting timer length. ### Claim 13 (depends on 7) The apparatus according to claim 7, wherein the apparatus is configured to receive the factor k from the base station. ### Claim 14 (depends on 7) The apparatus according to claim 7, wherein the factor k ranges between zero and infinity such that: k=[0,1, . . . , ∞], and wherein the apparatus is configured to receive the factor k from the base station via Radio Resource Control (RRC) and wherein the apparatus is configured to transmit the Scheduling Request on a Physical Uplink Control Channel (PUCCH). ### Claim 15 A method in a user equipment for transmitting scheduling requests to a base station, the base station is adapted to serve the user equipment, the user equipment is configured to transmit scheduling requests to the base station only at certain predetermined scheduling request opportunities, the method comprising: triggering a scheduling request transmission; transmitting a scheduling request to the base station at the next occurring scheduling request opportunity as a response to the triggering; starting a scheduling request prohibiting timer, comprised in the user equipment, when the scheduling request is transmitted to the base station; and prohibiting any further scheduling request retransmission at future scheduling request opportunities while the scheduling request prohibiting timer is running, wherein the scheduling request prohibiting timer is configured to a scheduling request prohibiting timer length which is equal to the time between two scheduling request opportunities multiplied with a sum of a factor k and a random variable l, wherein k and l are positive integers. ### Claim 16 (depends on 15) The method according to claim 15, comprising the further step of: stopping the scheduling request prohibiting timer when the scheduling request transmission trigger is cancelled or when the scheduling request prohibiting timer is expired. ### Claim 17 (depends on 15) The method according to claim 15, comprising the further step, to be performed before the other steps: configuring the scheduling request prohibiting timer with a scheduling request prohibiting timer length, such that the scheduling request prohibiting timer expires when the configured scheduling request prohibiting timer length has passed, after having started the scheduling request prohibiting timer. ### Claim 18 (depends on 15) The method according to claim 15, wherein the scheduling request prohibiting timer is configured to a fixed scheduling request prohibiting timer length. ### Claim 19 (depends on 15) The method according to claim 15, further comprising receiving the factor k from the base station. ### Claim 20 (depends on 15) The method according to claim 15, further comprising randomly generating the random variable l at the user equipment. ### Claim 21 (depends on 15) The method according to claim 15, wherein the factor k ranges between zero and infinity such that: k=[0,1, . . . , ∞], and the Scheduling Request is transmitted on a Physical Uplink Control Channel (PUCCH), and further comprising receiving the factor k via Radio Resource Control (RRC) from the base station. ### Claim 22 An apparatus for transmitting scheduling requests to a base station adapted to serve user equipment, wherein the apparatus is configured to transmit scheduling requests to the base station only at certain predetermined scheduling request opportunities, the apparatus comprising: a scheduling request transmission trigger, configured to trigger a scheduling request transmission; a transmitter, configured to transmit a scheduling request to the base station at the next occurring scheduling request opportunity as a response to the triggered scheduling request transmission; and a scheduling request prohibiting timer, configured to start when the scheduling request is transmitted first time and to prohibit any further scheduling request retransmission at future scheduling request opportunities while the scheduling request prohibiting timer is running, wherein the scheduling request prohibiting timer is configured to a scheduling request prohibiting timer length which is equal to the time between two scheduling request opportunities multiplied with a sum of a factor k and a random variable l, wherein k and l are positive integers. ### Claim 23 (depends on 22) The apparatus according to claim 22, wherein the apparatus is configured to stop the scheduling request prohibiting timer when the scheduling request transmission trigger is cancelled or when the scheduling request prohibiting timer is expired. ### Claim 24 (depends on 22) The apparatus according to claim 22, wherein the apparatus is further configured to configure the scheduling request prohibiting timer with a scheduling request prohibiting timer length, such that the scheduling request prohibiting timer expires when the configured scheduling request prohibiting timer length has passed, after having started the scheduling request prohibiting timer. ### Claim 25 (depends on 22) The apparatus according to claim 22, wherein the scheduling request prohibiting timer is configured to a fixed scheduling request prohibiting timer length. ### Claim 26 (depends on 22) The apparatus according to claim 22, wherein the apparatus is further configured to receive the factor k from the base station. ### Claim 27 (depends on 22) The apparatus according to claim 22, wherein the apparatus is further configured to randomly generate the random variable l. ### Claim 28 (depends on 22) The apparatus according to claim 22, wherein the factor k ranges between zero and infinity such that: k=[0,1, . . . , ∞], and wherein the apparatus is configured to receive the factor k from the base station via Radio Resource Control (RRC) and wherein the apparatus is configured to transmit the Scheduling Request on a Physical Uplink Control Channel (PUCCH).