# US 9,521,684 B2 · Radio station and method of processing user data with radio station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,684 B2 - Document ID: US9521684B2 - Status: Granted - Kind: B2 - Application number: 14/360,917 - Filed: 2012-10-03 - Published: 2014-11-13 - Granted: 2016-12-13 - Earliest claimed: 2011-11-25 - Assignees: NEC Corporation - Applicants: Hiroaki Aminaka; Kojiro Hamabe - Inventors: Hiroaki Aminaka; Kojiro Hamabe - Web page: https://patentgrep.com/patent/US9521684B2 ## CPC - H04W 72/12: Wireless traffic scheduling - H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} - H04W 88/085: {Access point devices with remote components} - H04L 1/1887: {Scheduling and prioritising arrangements} - H04W 28/0205: {at the air interface (dynamic wireless traffic scheduling H04W72/12)} - H04W 52/0261: {managing power supply demand, e.g. depending on battery level} - H04W 72/005 - H04W 72/1257 - H04W 88/08: Access point devices - H04W 92/12: between access points and access point controllers - 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 radio station (1) includes a first part (1A) and at least one second part (1B). The second part (1B) can be arranged so as to be physically separated from the first part (1A) and is connected to the first part (1A) via a transmission line (40) so as to be able to communicate with the first part (1A). The first part (1A) includes a bearer termination unit (10) capable of terminating at least one bearer between an upper network and the radio station (1). The second part (1B) includes a physical layer signal processing unit (12) that performs physical layer signal processing. The physical layer signal processing includes channel coding and decoding for user data pertaining to a first mobile station connected to the second part (1B) among a plurality of mobile stations. ## Claims ### Claim 1 A radio station that is used in a radio communication network and is capable of transmitting and receiving user data including downlink user data and uplink user data to and from a plurality of mobile stations via an air interface, the radio station comprising: a first part; and at least one second part that can be arranged so as to be physically separated from the first part, and is connected to the first part via a transmission line so as to be able to communicate with the first part, wherein the first part comprises a first bearer termination unit capable of terminating at least one bearer between an upper network and the radio station, the second part comprises a digital physical layer unit configured to perform digital physical layer signal processing, the digital physical layer signal processing includes channel coding for transmitting, to the air interface, the downlink user data pertaining to a first mobile station connected to the second part among the plurality of mobile stations, and channel decoding for restoring the uplink user data pertaining to the first mobile station from a signal received from the air interface, the first part further comprises a first scheduling unit configured to perform dynamic scheduling to allocate a radio resource to the plurality of mobile stations, the second part further comprises a second scheduling unit configured to operate in a cooperative manner with the first scheduling unit for the dynamic scheduling, and the second scheduling unit configured to calculate a parameter used for the dynamic scheduling based on a radio communication quality and send the parameter to the first scheduling unit. ### Claim 2 (depends on 1) The radio station according to claim 1, wherein the second scheduling unit executes scheduling for re-transmission of the downlink user data. ### Claim 3 (depends on 1) The radio station according to claim 1, wherein the second part further comprises an analog physical layer unit configured to perform analog signal processing including at least one of frequency conversion and power amplification in order to provide the air interface to the first mobile station. ### Claim 4 (depends on 1) The radio station according to claim 1, wherein the second part further comprises a layer-2 unit configured to perform layer-2 signal processing for transmitting the downlink user data pertaining to the first mobile station to the air interface and for restoring the uplink user data pertaining to the first mobile station from the received signal. ### Claim 5 (depends on 4) The radio station according to claim 4, wherein the layer-2 signal processing includes at least one of: (i) addition of a layer-2 header; (ii) data segmentation/concatenation; and (iii) composition of a transfer format by data multiplexing, so as to transmit the downlink user data to the air interface, and the layer-2 signal processing includes at least one of: (i) decomposition of a transfer format; (ii) de-segmentation/de-concatenation; and (iii) removal of a layer-2 header, so as to restore the uplink user data. ### Claim 6 (depends on 1) The radio station according to claim 1, wherein the second part further comprises a second bearer termination unit capable of performing, in place of the first bearer termination unit, termination of a bearer pertaining to the first mobile station among the at least one bearer. ### Claim 7 (depends on 6) The radio station according to claim 6, wherein one of the first and second bearer termination units to be used is selected based on a security level or a QoS class of the user data. ### Claim 8 (depends on 6) The radio station according to claim 6, wherein one of the first and second bearer termination units to be used is selected for each of the user data. ### Claim 9 (depends on 6) The radio station according to claim 6, wherein one of the first and second bearer termination units to be used is selected for each bearer. ### Claim 10 (depends on 6) The radio station according to claim 6, further comprising a control unit configured to determine which one of the first and second bearer termination units is used for termination of a bearer pertaining to the first mobile station. ### Claim 11 (depends on 6) The radio station according to claim 6, wherein the radio station determines which one of the first and second scheduling units is used for termination of a bearer pertaining to the first mobile station, based on an instruction from an external device. ### Claim 12 (depends on 1) The radio station according to claim 1, wherein the radio station is a base station or a relay station. ### Claim 13 A method of processing user data performed by a radio station, the radio station being used in a radio communication network and configured to transmit and receive user data including downlink user data and uplink user data to and from a plurality of mobile stations via an air interface, the radio station including a first part and at least one second part that can be arranged so as to be physically separated from the first part and is connected to the first part via a transmission line so as to be able to communicate with the first part, the processing method comprising: terminating, in the first part, at least one bearer between an upper network and the radio station; performing, in the second part, digital physical layer signal processing including channel coding for transmitting, to the air interface, the downlink user data pertaining to a first mobile station connected to the second part among the plurality of mobile stations, and channel decoding for restoring the uplink user data pertaining to the first mobile station from a signal received from the air interface, performing, in the first part, dynamic scheduling to allocate a radio resource to the plurality of mobile stations; and performing, in the second part, secondary scheduling in a cooperative manner with the first part for the dynamic scheduling, wherein the secondary scheduling includes calculating a parameter used for the dynamic scheduling based on a radio communication quality, and sending the parameter to the first part. ### Claim 14 (depends on 13) The method according to claim 13, wherein the secondary scheduling includes executing scheduling for re-transmission of the downlink user data. ### Claim 15 (depends on 13) The method according to claim 13, further comprising performing, in the second part, analog signal processing including at least one of frequency conversion and power amplification in order to provide the air interface to the first mobile station. ### Claim 16 (depends on 13) The method according to claim 13, further comprising performing, in the second part, layer-2 signal processing for transmitting the downlink user data pertaining to the first mobile station to the air interface and for restoring the uplink user data pertaining to the first mobile station from the received signal. ### Claim 17 (depends on 16) The method according to claim 16, wherein the layer-2 signal processing includes at least one of: (i) addition of a layer-2 header; (ii) data segmentation/concatenation; and (iii) composition of a transfer format by data multiplexing, so as to transmit the downlink user data to the air interface, and the layer-2 signal processing includes at least one of: (i) decomposition of a transfer format; (ii) de-segmentation/de-concatenation; and (iii) removal of a layer-2 header, so as to restore the uplink user data. ### Claim 18 (depends on 13) The method according to claim 13, further comprising alternatively using one of the first and second parts to terminate a bearer pertaining to the first mobile station among the at least one bearer. ### Claim 19 (depends on 18) The method according to claim 18, wherein the alternatively using includes selecting one of the first and second parts to be used, based on a security level or a QoS level of the user data. ### Claim 20 (depends on 18) The method according to claim 18, wherein the selecting one of the first and second parts to be used for terminating the bearer pertaining to the first mobile station is performed for each of the user data. ### Claim 21 (depends on 18) The method according to claim 18, wherein the selecting one of the first and second parts to be used for terminating the bearer pertaining to the first mobile station is performed for each bearer.