# US 9,439,223 B2 · Device and method for transmitting random access preamble > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,439,223 B2 - Document ID: US9439223B2 - Status: Granted - Kind: B2 - Application number: 14/459,798 - Filed: 2014-08-14 - Published: 2014-12-04 - Granted: 2016-09-06 - Earliest claimed: 2008-01-07 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Yingyang Li; Yujian Zhang; Xiaoqiang Li - Web page: https://patentgrep.com/patent/US9439223B2 ## CPC - H04W 72/044: based on the type of the allocated resource - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04J 11/005: {of intercell interference} - H04L 5/0005: {Time-frequency} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04W 72/02: Selection of wireless resources by user or terminal - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 74/004: {in the uplink, i.e. towards network} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 72/53: based on regulatory allocation policies - 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) - 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 Base Station (BS) and User Equipment (UE) apparatuses for configuring a Random Access CHannel (RACH), and methods thereof, are provided. The method for a BS to configure a RACH includes generating configuration information on RACH resources, transmitting the configuration information on the RACH resources to a UE, receiving a random access preamble multiplexed on a plurality of continuous RACH resources from the UE, extracting the random access preamble multiplexed on the plurality of continuous RACH resources, and detecting the extracted random access preamble. The method for a UE to configure a RACH includes receiving configuration information on RACH resources from a BS, selecting occupied RACH resources among a plurality of continuous RACH resources, generating a random access preamble, multiplexing the generated random access preamble on the selected RACH resources, and transmitting the random access preamble on the selected RACH resources to the BS. ## Claims ### Claim 1 A method for transmitting a random access preamble by a terminal in a wireless communication system employing time division duplex (TDD), the method comprising: receiving configuration information to allocate a random access channel (RACH) resource in an uplink pilot time slot (UpPTS) from a base station; acquiring a physical resource block among a plurality of physical resource blocks in the UpPTS using a frequency resource index according to the configuration information; generating a random access preamble; transmitting the random access preamble using a first resource determined based on the physical resource block if the terminal transmits the random access preamble in a first time; and transmitting the random access preamble using a second resource determined based on the physical resource block if the terminal transmits the random access preamble in a second time, wherein the first resource and the second resource are configured to different positions in the UpPTS. ### Claim 2 (depends on 1) The method of claim 1, wherein the random access preamble occupies a bandwidth corresponding to 6 consecutive resource blocks. ### Claim 3 (depends on 1) The method of claim 1, wherein the random access preamble is transmitted in the UpPTS. ### Claim 4 (depends on 1) The method of claim 1, wherein a format for the random access preamble transmitted in the UpPTS is 4. ### Claim 5 A method for receiving a random access preamble by a base station in a wireless communication system employing time division duplex (TDD), the method comprising: transmitting configuration information to allocate a random access channel (RACH) resource in an uplink pilot time slot (UpPTS) to a terminal, a random access preamble being generated by the terminal; receiving the random access preamble using a first resource determined based on a physical resource block if the base station receives the random access preamble in a first time, the physical resource block being determined among a plurality of physical resource blocks in the UpPTS based on the frequency resource index according to the configuration information; and receiving the random access preamble using a second resource determined based on the physical resource block if the base station receives the random access preamble in a second time, the physical resource block being determined among a plurality of physical resource blocks in the UpPTS based on the frequency resource index according to the configuration information, wherein the first resource and the second resource are configured to different positions in the UpPTS. ### Claim 6 (depends on 5) The method of claim 5, wherein the random access preamble occupies a bandwidth corresponding to 6 consecutive resource blocks. ### Claim 7 (depends on 5) The method of claim 5, wherein the random access preamble is received in the UpPTS. ### Claim 8 (depends on 5) The method of claim 5, wherein a format for the random access preamble received in the UpPTS is 4. ### Claim 9 A terminal for transmitting a random access preamble in a wireless communication system employing time division duplex (TDD), the terminal comprising: a generator configured to generate a random access preamble; and a transceiver configured to: receive configuration information to allocate a random access channel (RACH) resource in an uplink pilot time slot (UpPTS) from a base station, acquire a physical resource block among a plurality of physical resource blocks in the UpPTS using a frequency resource index according to the configuration information, transmit the random access preamble using a first resource based on the acquired physical resource block if the terminal transmits the random access preamble in a first time, and transmit the random access preamble using a second resource based on the acquired physical resource block if the terminal transmits the random access preamble in a second time, wherein the first resource and the second resource are configured to different positions in the UpPTS. ### Claim 10 (depends on 9) The terminal of claim 9, wherein the random access preamble occupies a bandwidth corresponding to 6 consecutive resource blocks. ### Claim 11 (depends on 9) The terminal of claim 9, wherein the random access preamble is transmitted in the UpPTS. ### Claim 12 (depends on 9) The terminal of claim 9, wherein a format for the random access preamble transmitted in the UpPTS is 4. ### Claim 13 A base station for receiving a random access preamble station in a wireless communication system employing time division duplex (TDD), the base station comprising: a generator configured to generate configuration information to allocate a random access channel (RACH) resource in an uplink pilot time slot (UpPTS); and a transceiver configured to: transmit the configuration information to a terminal, a random access preamble being generated by the terminal, receive the random access preamble using a first resource determined based on a physical resource block if the base station receives the random access preamble in a first time, the physical resource block being determined among a plurality of physical resource blocks in the UpPTS based on the frequency resource index according to the configuration information, and receive the random access preamble using a second resource based on the physical resource block if the base station receives the random access preamble in a second time, the physical resource block being determined among a plurality of physical resource blocks in the UpPTS based on the frequency resource index according to the configuration information, wherein the first resource and the second resource are configured to different positions in the UpPTS. ### Claim 14 (depends on 13) The base station of claim 13, wherein the random access preamble occupies a bandwidth corresponding to 6 consecutive resource blocks. ### Claim 15 (depends on 13) The base station of claim 13, wherein the random access preamble is received in the UpPTS. ### Claim 16 (depends on 13) The base station of claim 13, wherein a format for the random access preamble received in the UpPTS is 4.