# US 10,485,030 B2 · Method and apparatus for receiving uplink signal in train communication network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,485,030 B2 - Document ID: US10485030B2 - Status: Granted - Kind: B2 - Application number: 15/802,682 - Filed: 2017-11-03 - Published: 2018-05-10 - Granted: 2019-11-19 - Earliest claimed: 2016-11-04 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Bing Hui; Yeong Jin Kim; Il Gyu Kim; Jun Hwan Lee; Hee Sang Chung - Web page: https://patentgrep.com/patent/US10485030B2 ## CPC - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 36/0005: {Control or signalling for completing the hand-off} - H04W 36/0077: {of access information of target access point} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 48/16: Discovering, processing access restriction or access information - H04W 74/004: {in the uplink, i.e. towards network} - H04W 74/0836: with 2-step access - H04W 84/005: {Moving wireless networks} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method and a terrestrial base station for receiving an uplink signal. The terrestrial base station is configured to: receive a preamble corresponding to an orthogonal pseudo-noise (PN) sequence of a plurality of the orthogonal PN sequences from an onboard base station in a train; recognize identification (ID) of the onboard base station from the preamble, and allocate a temporary network ID and an uplink grant (UL grant) to the onboard base station; and receive the uplink signal transmitted based on the temporary network ID and the UL grant. ## Claims ### Claim 1 A method for receiving an uplink signal by a terrestrial base station, comprising: receiving a preamble corresponding to an orthogonal pseudo-noise (PN) sequence of a plurality of orthogonal PN sequences from an onboard wireless device in a train, wherein the onboard wireless device is connected with the terrestrial base station through a wireless backhaul link; recognizing an identification (ID) of the onboard wireless device from the preamble, storing the recognized ID of the onboard wireless device, and allocating a temporary network ID and an uplink grant (UL grant) to the onboard wireless device; receiving the uplink signal transmitted based on the temporary network ID and the UL grant; obtaining an ID of the onboard wireless device from the uplink signal; and determining whether a random access of the onboard wireless device is for a network initial access, for a network re-access, or for a handover, by comparing the obtained ID with the recognized ID of the onboard wireless device stored in advance. ### Claim 2 (depends on 1) The method of claim 1, further comprising: determining a frame configuration for transmission of the uplink signal based on the orthogonal PN sequence corresponding to the preamble. ### Claim 3 (depends on 2) The method of claim 2, wherein the determining a frame configuration for transmission of the uplink signal based on the orthogonal PN sequence corresponding to the preamble comprises: determining an index of an orthogonal PN sequence group to which the orthogonal PN sequence corresponding to the preamble belongs as an index of the frame configuration. ### Claim 4 (depends on 1) The method of claim 1, wherein the recognizing ID of the onboard base station wireless device from the preamble comprises recognizing an index of the orthogonal PN sequences as the ID of the onboard base station wireless device. ### Claim 5 (depends on 1) The method of claim 1, wherein the recognizing ID of the onboard base station wireless device from the preamble comprises recognizing the ID of the onboard base station wireless device from a payload which is multiplexed with the preamble. ### Claim 6 (depends on 1) The method of claim 1, wherein the determining whether a random access of the onboard wireless device is for a network initial access, for a network re-access, or for a handover by comparing the obtained ID with [a previous] the recognized ID of the onboard wireless device stored in advance comprises: determining that the random access is for the network re-access if the obtained ID is the same as the recognized ID. ### Claim 7 (depends on 1) The method of claim 1, wherein the determining whether a random access of the onboard wireless device is for a network initial access, for a network re-access, or for a handover by comparing the obtained ID with the recognized ID of the onboard wireless device stored in advance comprises: requesting a downlink packet sequence number from a neighbor terrestrial base station if the obtained ID is different from the recognized ID. ### Claim 8 (depends on 7) The method of claim 7, further comprising: after the requesting of a downlink packet sequence number from a neighbor terrestrial base station if the obtained ID is different from the recognized ID, determining that the random access is for the handover when the downlink packet sequence number is received from the neighbor terrestrial base station. ### Claim 9 (depends on 7) The method of claim 7, further comprising: after the requesting of a downlink packet sequence number from a neighbor terrestrial base station if the obtained ID is different from the recognized ID, determining that the random access is for the network initial access when the downlink packet sequence number is not received from the neighbor terrestrial base station. ### Claim 10 A terrestrial base station for receiving an uplink signal, comprising: a processor, a memory, and a radio frequency (RF) unit, wherein the processor executes a program stored in the memory to perform: receiving, by using the RF unit, a preamble corresponding to an orthogonal pseudo-noise (PN) sequence of a plurality of orthogonal PN sequences from an onboard wireless device in a train, wherein the onboard wireless device is connected with the terrestrial base station through a wireless backhaul link; recognizing an identification (ID) of the onboard wireless device from the preamble storing the recognized ID of the onboard wireless device, and allocating a temporary network ID and an uplink grant (UL grant) to the onboard wireless device; receiving, by using the RF unit, the uplink signal transmitted based on the temporary network ID and the UL grants; obtaining an ID of the onboard wireless device from the uplink signal; and determining whether a random access of the onboard wireless device is for a network initial access, for a network re-access, or for a handover, by comparing the obtained ID with the recognized ID of the onboard wireless device stored in advance. ### Claim 11 (depends on 10) The terrestrial base station of claim 10, wherein the processor executes the program to further perform determining a frame configuration for transmission of the uplink signal based on the orthogonal PN sequence corresponding to the preamble. ### Claim 12 (depends on 11) The terrestrial base station of claim 11, wherein when determining a frame configuration for transmission of the uplink signal based on the orthogonal PN sequence corresponding to the preamble, the processor performs: determining an index of an orthogonal PN sequence group to which the orthogonal PN sequence corresponding to the preamble belongs as an index of the frame configuration. ### Claim 13 (depends on 11) The terrestrial base station of claim 11, wherein when recognizing ID of the onboard wireless device from the preamble, the processor performs recognizing an index of the orthogonal PN sequences as the ID of the onboard wireless device. ### Claim 14 (depends on 11) The terrestrial base station of claim 11, wherein when recognizing ID of the onboard wireless device from the preamble, the processor performs recognizing the ID of the onboard wireless device from a payload which is multiplexed with the preamble. ### Claim 15 (depends on 10) The terrestrial base station of claim 10, wherein: when determining whether a random access of the onboard wireless device is for a network initial access, for a network re-access, or for a handover by comparing the obtained ID with the recognized ID of the onboard wireless device stored in advance, the processor performs determining that the random access is for the network re-access if the obtained ID is same as the recognized ID. ### Claim 16 (depends on 10) The terrestrial base station of claim 10, wherein: when determining whether a random access of the onboard wireless device is for a network initial access, for a network re-access, or for a handover by comparing the obtained ID with the recognized ID of the onboard wireless device stored in advance, the processor performs requesting a downlink packet sequence number from a neighbor terrestrial base station if the obtained ID is different from the recognized ID. ### Claim 17 (depends on 16) The terrestrial base station of claim 16, wherein the processor executes the program to further perform: after the requesting a downlink packet sequence number from a neighbor terrestrial base station if the obtained ID is different from the recognized ID, determining that the random access is for the handover when the downlink packet sequence number is received from the neighbor terrestrial base station. ### Claim 18 (depends on 16) The terrestrial base station of claim 16, wherein the processor executes the program to further perform: after the requesting a downlink packet sequence number from a neighbor terrestrial base station if the obtained ID is different from the recognized ID, determining that the random access is for the network initial access when the downlink.