# US 8,570,992 B2 · Dedicated signature allocation and choice > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,992 B2 - Document ID: US8570992B2 - Status: Granted - Kind: B2 - Application number: 12/673,757 - Filed: 2008-08-14 - Published: 2011-04-07 - Granted: 2013-10-29 - Earliest claimed: 2007-08-15 - Assignees: LG Electronics Inc. - Applicants: Patrick Fischer; Remi Feuillette; Dragan Vujcic - Inventors: Patrick Fischer; Remi Feuillette; Dragan Vujcic - Web page: https://patentgrep.com/patent/US8570992B2 ## CPC - H04W 74/02: Hybrid access - H04W 74/004: {in the uplink, i.e. towards network} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0838: using contention-free random access [CFRA] - H04W 74/0866: {using a dedicated channel for access} - H04J 13/0059: {CAZAC [constant-amplitude and zero auto-correlation]} - H04J 13/0062: {Zadoff-Chu} - H04L 27/2607: {Cyclic extensions} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods for allocating and choosing dedicated signatures for random access are provided. Options for allocating dedicated signatures include allocating the dedicated signature from the unused space of the random signature root index when there is unused space and allocating more dedicated signatures from the same root index using the same time/frequency resources if additional signatures are needed, and reserving some preambles from the contention-based random access preambles from both sets of preambles. The present invention also proposes that the dedicated signatures be reserved in each of two sets of preambles. ## Claims ### Claim 1 A method of requesting a random access connection between a wireless mobile terminal and a base station, the method comprising: the mobile terminal receiving information comprising at least one signature root sequence index, a cyclic shift parameter and a dedicated signature parameter, the dedicated signature parameter being associated with a contention-free signature; the mobile terminal generating a contention-based signature or the contention-free signature; and the mobile terminal transmitting at least one of the contention-free signature or the contention-based signature for random access, wherein the contention-based signature is recognized based on the at least one signature root sequence index and the cyclic shift parameter, wherein the contention-free signature is recognized based on the dedicated signature parameter, wherein the contention-based signature is associated with a first signature set and the contention-free signature is associated with a second signature set. ### Claim 2 (depends on 1) The method of claim 1, further comprising dividing contiguously arranged indices between the first and second signature sets. ### Claim 3 (depends on 1) The method of claim 1, wherein: a number of contention-based signatures in the first signature set is NRset1 =ceil((Nset1)/64*(Nr-Nunused)); and a number of contention-based signatures in the second signature set is Nrset2 =Nr-NRset1-Nunused, wherein: Nr is a total number of signatures that can be reserved among 64 contention-based random access signatures; Nset1 is a number of signatures in the first signature set; Nset2 is a number of signatures in the second signature set; and Nunused is a number of signatures that are not used as root sequences. ### Claim 4 (depends on 1) The method of claim 1, wherein the contention-based signature or the contention-free signature associated with Zadoff-Chu signatures. ### Claim 5 (depends on 1) The method of claim 1, further comprising: receiving at least two dedicated signature identifiers; and selecting one of the at least two dedicated signature identifiers according to an amount of data for transmission, wherein at least one of the at least two dedicated signature identifiers is associated with the first signature set and the other of the at least two dedicated signature identifiers is associated with the second signature set. ### Claim 6 (depends on 5) The method of claim 5, wherein the at least two dedicated signature identifiers are received during a handover procedure. ### Claim 7 A mobile terminal for requesting a random access connection with a base station, the mobile terminal comprising: a transmitting unit configured to transmit information; a receiving unit configured to receive information; a display unit configured to display information; an input unit configured to receive inputs from a user; and a processing unit configured to: process the received information comprising at least one signature root sequence index, a cyclic shift parameter, and a dedicated signature parameter, generate a contention-free signature or a contention-based signature, and transmit the contention-free signature or the contention-based signature for random access, wherein the dedicated signature parameter being associated with a contention-free signature; wherein the contention-based signature being recognized based on the at least one signature root sequence index and the cyclic shift parameter, wherein the contention-free signature being recognized based on the dedicated signature parameter, and wherein the contention-based signature being associated with a first signature set and the contention-free signature being associated with a second signature set. ### Claim 8 (depends on 7) The mobile terminal of claim 7, wherein the processing unit divides contiguously arranged indices between the first and second signature sets. ### Claim 9 (depends on 7) The mobile terminal of claim 7, wherein the contention-based signature or the contention-free signature is associated with Zadoff-Chu signatures. ### Claim 10 (depends on 7) The mobile terminal of claim 7, wherein the dedicated signature parameter is received during a handover procedure. ### Claim 11 A method of requesting a random access connection in a wireless mobile terminal, the method comprising: the mobile terminal receiving information comprising at least one signature root sequence index, a cyclic shift parameter, and a dedicated signature parameter; the mobile terminal recognizing at least the contention-free signature or a contention-based signature; and the mobile terminal transmitting at least the contention-free signature or the contention-based signature for random access, wherein the dedicated signature parameter being associated with a contention-free signature, wherein the contention-based signature is recognized based on the at least one signature root sequence index and the cyclic shift parameter, wherein the contention-free signature is recognized based on the dedicated signature parameter, and wherein the contention-based signature is associated with a first signature set and the contention-free signature is associated with a second signature set. ### Claim 12 (depends on 1) The method of claim 1, further comprising dividing contiguously arranged indices between the first and second signature sets. ### Claim 13 (depends on 1) The method of claim 1, wherein the contention-based signature or the contention-free signature associated with Zadoff-Chu signatures. ### Claim 14 (depends on 11) The method of claim 11, wherein the dedicated signature parameter is received during a handover procedure. ### Claim 15 (depends on 1) The method of claim 1, wherein the first signature set corresponds to a first transport format and the second signature set corresponds to a second transport format. ### Claim 16 (depends on 7) The mobile terminal of claim 7, wherein the first signature set corresponds to a first transport format and the second signature set corresponds to a second transport format. ### Claim 17 (depends on 11) The method of claim 11, wherein the first signature set corresponds to a first transport format and the second signature set corresponds to a second transport format.