# US 2015/0103789 A1 · Radio communication system, radio base station apparatus, terminal apparatus, and radio resource allocation method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0103789 A1 - Document ID: US20150103789A1 - Status: Published application - Kind: A1 - Application number: 14/550,219 - Filed: 2014-11-21 - Published: 2015-04-16 - Earliest claimed: 2012-05-31 - Assignees: Fujitsu Limited - Applicants: Fujitsu Limited - Inventors: YOSHINORI TANAKA - Web page: https://patentgrep.com/patent/US20150103789A1 ## CPC - H04W 72/27: between access points - H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 40/22: using selective relaying for reaching a BTS [Base Transceiver Station] or an access point - H04W 76/14: Direct-mode setup - H04W 92/18: between terminal devices - H04W 92/20: between access points - Y02D 30/70: in wireless communication networks - 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) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A radio communication system includes a first and second radio base station apparatuses; and a first to third terminal apparatuses, wherein the first radio base station apparatus includes a radio resource control unit configured to allocate to the first terminal apparatus a second radio resource, in contrast to a first radio resource allocated when the first terminal apparatus performs first radio communication via the first radio base station apparatus, when the first terminal apparatus performs second radio communication with the second terminal apparatus not via the first radio base station apparatus, and a first transmission unit configured to transmit allocation information of the second radio resource to the first terminal apparatus, and the second radio resource is same as or partially overlapped with a third radio resource allocated, by the second radio base station apparatus, when the third terminal apparatus performs the second radio communication. ## Claims ### Claim 1 A radio communication system comprising: a first and second radio base station apparatuses; and a first to third terminal apparatuses, wherein the first radio base station apparatus includes: a radio resource control unit configured to allocate to the first terminal apparatus a second radio resource, in contrast to a first radio resource allocated when the first terminal apparatus performs first radio communication via the first radio base station apparatus, when the first terminal apparatus performs second radio communication with the second terminal apparatus not via the first radio base station apparatus, and a first transmission unit configured to transmit allocation information of the second radio resource to the first terminal apparatus, the first terminal apparatus includes a reception unit configured to receive the allocation information from the first radio base station apparatus, and the second radio resource is same as or partially overlapped with a third radio resource allocated, by the second radio base station apparatus, when the third terminal apparatus performs the second radio communication. ### Claim 2 (depends on 1) The radio communication system according to claim 1, wherein the radio resource control unit is configured to allocated to the first terminal apparatus a fourth radio resource in the first radio resource or in the second radio resource, when the first terminal apparatus performs the second radio communication outside of a communication range of the first radio base station apparatus, the transmission unit is configured to transmit allocation information of the fourth radio resource to the first terminal apparatus, and the reception unit is configured to receive the allocation information from the first radio base station apparatus. ### Claim 3 (depends on 2) The radio communication system according to claim 2, wherein the fourth radio resource is same as or partially overlapped with a fifth radio resource allocated by the second radio base station apparatus when the third terminal apparatus performs the second radio communication outside of a communication range of the second radio base station apparatus. ### Claim 4 (depends on 1) The radio communication system according to claim 1, wherein the transmission unit is configured to transmit the allocation information to the first terminal apparatus by transmitting by broadcast the allocation information of the second radio resource as broadcast information. ### Claim 5 (depends on 1) The radio communication system according to claim 1, wherein the second radio resource is same as the third radio resource when the second terminal apparatus locates in a communication range of the second radio base station apparatus. ### Claim 6 (depends on 1) The radio communication system according to claim 1, wherein the first terminal apparatus includes a second transmission unit configured to transmit a message to the second terminal apparatus by using the second radio resource, and the message is a message to be transmitted and received in a collision avoidance procedure between the second radio communication and another the second radio communication. ### Claim 7 (depends on 1) The radio communication system according to claim 1, wherein the radio resource control unit is configured to allocate the second radio resource to any frequency channel out of a plurality of frequency channels, and the transmission unit is configured to transmit the allocation information included in identification information of the frequency channel allocated to the second radio resource out of the plurality of frequency channels. ### Claim 8 (depends on 2) The radio communication system according to claim 2, wherein the radio resource control unit is configured to allocate the fourth radio resource to any frequency channel out of a plurality of frequency channels, and the transmission unit is configured to transmit the allocation information included in identification information of the frequency channel allocated to the fourth radio resource out of the plurality of the frequency channels. ### Claim 9 (depends on 1) The radio communication system according to claim 1, wherein the radio resource control unit is configured to allocate the second radio resource to each of a plurality of frequency channels, and the transmission unit is configured to transmit the allocation information included in identification information of a frequency channel including a range allocated to the second radio resource when there is the frequency channel including the range different from a range in another frequency channel allocated to the second radio resource out of the plurality of frequency channels allocated to the second radio resource. ### Claim 10 (depends on 1) The radio communication system according to claim 1, wherein the radio resource control unit is configured to allocate the fourth radio resource to each of a plurality of frequency channels, and the transmission unit is configured to transmit the allocation information included in identification information of a frequency channel including a range allocated to the fourth radio resource when there is the frequency channel including the range different from a range in another frequency channel allocated to the fourth radio resource out of the plurality of frequency channels allocated to the fourth radio resource. ### Claim 11 (depends on 1) The radio communication system according to claim 1, wherein the radio resource control unit is configured to allocate the second radio resource to a radio resource to a first communication link from the first radio base station apparatus to the first terminal apparatus and a radio resource to a second communication link from the first terminal apparatus to the first radio base station apparatus. ### Claim 12 (depends on 1) The radio communication system according to claim 1, wherein the radio resource control unit changes a size of the second radio resource according to an amount of communication traffic of a terminal apparatus subordinate to the first radio base station apparatus. ### Claim 13 (depends on 1) The radio communication system according to claim 1, wherein the first terminal apparatus includes: a communication control unit configured to change transmission power of a radio signal transmitted to the second terminal apparatus, and a second transmission unit configured to transmit the radio signal to the second terminal apparatus, and the second transmission unit is configured to transmit the radio signal to the second terminal apparatus by the transmission power determined by the communication control unit. ### Claim 14 (depends on 1) The radio communication system according to claim 1, wherein the radio resource control unit is configured to allocate to the first terminal apparatus located in distance within a threshold to the first radio base station apparatus, a radio resource not overlapped with the third radio resource out of the second radio resource, when the second radio resource overlaps a part of the third radio resource. ### Claim 15 (depends on 14) The radio communication system according to claim 14, wherein the first terminal apparatus includes: a communication control unit configured to change transmission power of a radio signal transmitted to the second terminal apparatus, and a second transmission unit configured to transmit the radio signal to the second terminal apparatus, and the second transmission unit is configured to transmit the radio signal to the second terminal apparatus by transmission power determined by the communication control unit and by using a radio resource not overlapped with the third radio resource. ### Claim 16 (depends on 1) The radio communication system according to claim 1, wherein the radio resource control unit is configured to allocate the second radio resource to a part of subframes out of a plurality of subframes allocated to the first radio resource when the radio resource control unit is configured to allocate the first radio resource to each of the plurality of subframes. ### Claim 17 (depends on 1) The radio communication system according to claim 1, wherein the radio resource control unit is configured to allocate the second radio frame to all subframes in the part of subframes allocated to the second radio frame. ### Claim 18 A radio base station apparatus comprising: a radio resource control unit configured to allocate to a first terminal apparatus to a second radio resource, in contrast to a first radio resource allocated when the first terminal apparatus performs first radio communication via the radio base station apparatus, when the first terminal apparatus performs second radio communication with the second terminal apparatus not via the radio base station apparatus; and a transmission unit configured to transmit allocation information of the second radio resource to the first terminal apparatus, wherein the second radio resource is same as or partially overlapped with a third radio resource allocated, by another radio base station apparatus, when a third terminal apparatus performs the second radio communication. ### Claim 19 A terminal apparatus comprising: a reception unit configured to receive resource information of an allocated second radio resource in contrast to a first radio resource allocated by the radio base station apparatus when the terminal apparatus performs first radio communication via the radio base station apparatus, when the terminal apparatus performs second radio communication with a first terminal apparatus not via the radio base station apparatus, wherein the second radio resource is same as or partially overlapped with a third radio resource allocated, by another radio base station apparatus, when a second terminal apparatus performs the second radio communication.