# US 7,613,462 B2 · Reservation multiple access > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,613,462 B2 - Document ID: US7613462B2 - Status: Granted - Kind: B2 - Application number: 11/252,858 - Filed: 2005-10-17 - Published: 2006-02-23 - Granted: 2009-11-03 - Earliest claimed: 1998-10-15 - Assignees: QUALCOMM Incorporated - Inventors: Serge Willenegger; Vieri Vanghi; Rod J. Walton - Web page: https://patentgrep.com/patent/US7613462B2 ## CPC - H04W 74/002: {Transmission of channel access control information} - H04W 52/223: {predicting future states of the transmission} - H04W 52/32: TPC of broadcast or control channels - H04W 52/50: at the moment of starting communication in a multiple access environment - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0866: {using a dedicated channel for access} - H04W 52/60: using different transmission rates for TPC commands - H04W 72/04: Wireless resource allocation - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A mobile station accesses a base station by randomly selecting a first reverse link common control channel from a set of random access channels. The mobile station transmits a request portion of an access probe over the first reverse link common control channel. The request portion is subject to collision with other signals. The request portion comprises a hash identification which is derived from a uniquely identifying number using a hash function. The hash identification quasi-uniquely identifies the mobile station. The mobile station receives a channel assignment message from the base station designating the hash identification and a reserved access channel. The reserved access channel provides communication with a low probability of contention. The mobile station transmits a message portion of the access probe over the reserved access channel. ## Claims ### Claim 1 A method for accessing a base station performed at a mobile station in a communication system, comprising: selecting a signature sequence from a plurality of signature sequences; transmitting an access request utilizing the selected signature sequence from the mobile station; determining if a channel assignment message, which is responsive to the access request and is modulated with at least one of the selected signature sequence or a signature associated with the selected signature, is received from the base station; and transmitting another access request, if the channel assignment message is determined as not being received. ### Claim 2 (depends on 1) The method of claim 1, wherein the plurality of signature sequences comprises a plurality of code sequences. ### Claim 3 (depends on 2) The method of claim 2, wherein determining if the channel assignment message is received comprises determining whether a message modulated with the code sequence is received from the base station. ### Claim 4 (depends on 1) The method of claim 1, wherein the plurality of signature sequences comprises a plurality of binary code sequences. ### Claim 5 (depends on 1) The method of claim 1, further comprising determining a random delay, if the channel assignment message from the base station is not received. ### Claim 6 (depends on 5) The method of claim 5, further comprising increasing a transmit power for transmitting the another access request, if the channel assignment message from the base station is not received. ### Claim 7 (depends on 1) The method of claim 1, wherein transmitting the another request comprises transmitting the another request after a random delay period, if the channel assignment message from the base station is not received. ### Claim 8 (depends on 1) The method of claim 1, wherein the channel assignment message comprises a power control correction value and the method further comprising adjusting a transmit power of future transmissions, from the mobile station, based upon the power control correction value. ### Claim 9 (depends on 1) The method of claim 1, wherein the channel assignment message comprises an assignment of a reserve access channel that provides a low probability of contention. ### Claim 10 (depends on 1) The method of claim 1, wherein the plurality of signature sequences comprises 16 different 1 msec long signatures. ### Claim 11 (depends on 1) The method of claim 1, wherein transmitting the another access request comprises transmitting the another access request using the signature sequence. ### Claim 12 (depends on 1) The method of claim 1, wherein transmitting the access request utilizing the signature sequence comprises transmitting the access request modulated utilizing the signature sequence. ### Claim 13 A mobile station comprising: a controller configured to select a signature sequence from a plurality of signature sequences; a modulator configure to modulate the selected signature sequence in an access request; and a transmitter configured to transmit the access request, wherein the controller is further configured to determine if a channel assignment message, which is responsive to the access request and is modulated with at least one of the selected signature sequence or a signature associated with the selected signature, from a base station is received and wherein the transmitter is configured to transmit another access request, if the channel assignment message is determined as not being received by the controller. ### Claim 14 (depends on 13) The mobile station of claim 13, wherein the plurality of signature sequences comprises a plurality of code sequences. ### Claim 15 (depends on 14) The mobile station of claim 14, wherein the controller determines if the channel assignment message is received by determining whether a message modulated with the code sequence is received from the base station. ### Claim 16 (depends on 13) The mobile station of claim 13, wherein the plurality of signature sequences comprises a plurality of binary code sequences. ### Claim 17 (depends on 13) The mobile station of claim 13, wherein the controller is configured to determine a random delay, if the channel assignment message from the base station is not received. ### Claim 18 (depends on 17) The mobile station of claim 17, wherein the transmitter is configured to increase a transmit power for transmitting the another access request, if the channel assignment message from the base station is not received. ### Claim 19 (depends on 13) The mobile station of claim 13, wherein the transmitter is configured to transmit the another request after a random delay period, if the channel assignment message from the base station is not received. ### Claim 20 (depends on 13) The mobile station of claim 13, wherein the channel assignment message comprises an assignment of a reserve access channel that provides a low probability of contention. ### Claim 21 (depends on 13) The mobile station of claim 13, wherein the plurality of signature sequences comprises 16 different 1 msec long signatures. ### Claim 22 (depends on 13) The mobile station of claim 13, wherein the transitter is configured to transmit the another access request modulated with the signature sequence. ### Claim 23 (depends on 13) The mobile station a mobile station of claim 13, wherein the transmitter is configured to transmit the access request modulated with the signature sequence. ### Claim 24 An apparatus comprising: means for selecting a signature sequence from a plurality of signature sequences; means for transmitting an access request utilizing the selected signature sequence from a mobile station; means for determining if a channel assignment message, which is responsive to the access request and is modulated with at least one of the selected signature sequence or a signature associated with the selected signature, is received from a base station; and a transmitter configured to transmit another access request, if the channel assignment message is determined as not being received. ### Claim 25 (depends on 24) The apparatus of claim 24, wherein the plurality of signature sequences comprise a plurality of code sequences. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the means for determining comprises means for determining whether a message modulated with the code sequence is received from the base station. ### Claim 27 (depends on 24) The apparatus of claim 24, wherein the plurality of signature sequences comprise a plurality of binary code sequences. ### Claim 28 (depends on 24) The apparatus of claim 24, further comprising means for determining a random delay, if the channel assignment message from the base station is not received. ### Claim 29 (depends on 28) The apparatus of claim 28, further comprising means for increasing a transmit power for transmitting the another access request, if the channel assignment message from the base station is not received. ### Claim 30 (depends on 24) The apparatus of claim 24, wherein the transmitter is configured to transmit the another request comprises transmitting the another request after a random delay period, if the channel assignment message from the base station is not received. ### Claim 31 (depends on 24) The apparatus of claim 24, wherein the channel assignment comprises a power control correction value and the apparatus further comprising means for adjusting a transmit power of future transmissions, from the mobile station, based upon the power control correction value. ### Claim 32 (depends on 24) The apparatus of claim 24, wherein the channel assignment message comprises an assignment of a reserve access channel that provides a low probability of contention. ### Claim 33 (depends on 24) The apparatus of claim 24, wherein the plurality of signature sequences comprises 16 different 1 msec long signatures. ### Claim 34 (depends on 24) The apparatus of claim 24, wherein the transmitter is configured to transmit the another access request using the signature sequence. ### Claim 35 (depends on 24) The apparatus of claim 24, wherein the transmitter is configured to transmit the access request modulated with the signature sequence. ### Claim 36 A computer-readable media comprising instructions that are utilized by a controller, the instructions comprising: instructions for selecting a signature sequence from a plurality of signature sequences; instructions for transmitting an access request utilizing the selected signature sequence from a mobile station; instructions for determining if a channel assignment message, which is responsive to the access request and is modulated with at least one of the selected signature sequence or a signature associated with the selected signature, is received from a base station; and instructions for transmitting another access request, if the channel assignment message is determined as not being received. ### Claim 37 (depends on 36) The computer-readable media of claim 36, wherein the computer-readable media comprises a memory. ### Claim 38 (depends on 36) The computer-readable media of claim 36, wherein the computer-readable media comprises programmable storage devices. ### Claim 39 A method for accessing a base station performed at a mobile station in a communication system, comprising: selecting a signature sequence from a plurality of signature sequences; transmitting an access request utilizing the selected signature sequence from the mobile station; determining if a channel assignment message, which is responsive to the access request and includes a field which designates the signature sequence selected from the plurality of signature sequences, is received from the base station; and transmitting another access request, if the channel assignment message is determined as not being received. ### Claim 40 (depends on 39) The method of claim 39, wherein the field comprises N bits, and wherein the plurality of signature sequences comprises 2N signature sequences. ### Claim 41 (depends on 39) The method of claim 39, wherein the plurality of signature sequences are ordered in a predefined order, and wherein the field enumerates the position of the selected signature within the predefined order. ### Claim 42 A mobile station comprising: a controller configured to select a signature sequence from a plurality of signature sequences; a modulator configure to modulate the selected signature sequence in an access request; and a transmitter configured to transmit the modulated access request, wherein the controller is further configured to determine if a channel assignment message, which is responsive to the access request and includes a field which designates the signature sequence selected from the plurality of signature sequences, is received from the base station, from a base station is received and wherein the transmitter is configured to transmit another access request, if the channel assignment message is determined as not being received by the controller. ### Claim 43 (depends on 42) The mobile station of claim 42, wherein the field comprises N bits, and wherein the plurality of signature sequences comprises 2N signature sequences. ### Claim 44 (depends on 42) The mobile station of claim 42, wherein the plurality of signature sequences are ordered in a predefined order, and wherein the field enumerates the position of the selected signature within the predefined order. ### Claim 45 An apparatus comprising: means for selecting a signature sequence from a plurality of signature sequences; means for transmitting an access request utilizing the selected signature sequence from a mobile station; means for determining if a channel assignment message, which is responsive to the access request and includes a field which designates the signature sequence selected from the plurality of signature sequences, is received from a base station; and a transmitter configured to transmit another access request, if the channel assignment message is determined as not being received. ### Claim 46 (depends on 45) The apparatus of claim 45, wherein the field comprises N bits, and wherein the plurality of signature sequences comprises 2N signature sequences. ### Claim 47 (depends on 45) The apparatus of claim 45, wherein the plurality of signature sequences are ordered in a predefined order, and wherein the field enumerates the position of the selected signature within the predefined order. ### Claim 48 A computer-readable media comprising instructions that are utilized by a controller, the instructions comprising: instructions for selecting a signature sequence from a plurality of signature sequences; instructions for transmitting an access request utilizing the selected signature sequence from a mobile station; instructions for determining if a channel assignment message, which is responsive to the access request and includes a field which designates the signature sequence selected from the plurality of signature sequences, is received from a base station; and instructions for transmitting another access request, if the channel assignment message is determined as not being received. ### Claim 49 (depends on 48) The computer-readable media of claim 48, wherein the field comprises N bits, and wherein the plurality of signature sequences comprises 2N signature sequences. ### Claim 50 (depends on 48) The computer-readable media of claim 48, wherein the plurality of signature sequences are ordered in a predefined order, and wherein the field enumerates the position of the selected signature within the predefined order.