# US 2019/0246418 A1 · Scheduling request procedure for d2d communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0246418 A1 - Document ID: US20190246418A1 - Status: Published application - Kind: A1 - Application number: 16/385,996 - Filed: 2019-04-16 - Published: 2019-08-08 - Earliest claimed: 2014-03-21 - Assignees: Sun Patent Trust - Applicants: Sun Patent Trust - Inventors: Joachim Loehr; Prateek Basu Mallick - Web page: https://patentgrep.com/patent/US20190246418A1 ## CPC - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 76/14: Direct-mode setup - H04W 72/543: based on requested quality, e.g. QoS - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present invention relates to a D2D capable a communication method and to a transmitting user equipment, which transmits data to a receiving user equipment over a direct link data channel, uses the services of the eNodeB in order to have resources allocated for transmitting said data. To this end the UE sends to the eNB scheduling information using resources of a subframe dedicated for standard uplink communication through the eNodeB, rather than using resources on the subframe dedicated to D2D data transmission. In order to allow the eNB to distinguish whether the received scheduling request is for allocating resources for transmitting data over the direct link channel or over the eNB, UE may send along with the scheduling information also identification information associated to the scheduling information. ## Claims ### Claim 1 A base station comprising: a receiver, which, in operation, receives from a communication apparatus a direct link Buffer Status Report (BSR) for a device to device (D2D) communication, wherein the direct link BSR is a message that informs the base station of an amount of D2D data to be transmitted from the communication apparatus to a destination user equipment; and a transmitter, which, in operation, transmits to the communication apparatus a D2D grant that schedules D2D resources for the D2D data, wherein an uplink BSR has a higher priority in resource scheduling than the direct link BSR, the uplink BSR being a message that informs the base station of an amount of uplink data to be transmitted from the communication apparatus to the base station. ### Claim 2 (depends on 1) The base station according to claim 1, wherein the direct link BSR is transmitted in a direct link BSR MAC control element with an index identifying a type of the D2D data and/or with a MAC header that includes a logical channel ID. ### Claim 3 (depends on 1) The base station according to claim 1, wherein the D2D resources are a set of subframes for the D2D communication. ### Claim 4 (depends on 1) The communication apparatus according to claim 1, wherein the direct link BSR includes the amount of D2D data and one or more additional pieces of information relating to the D2D communication. ### Claim 5 (depends on 1) The base station according to claim 1, wherein the receiver, in operation, receives from the communication apparatus a Scheduling Request (SR) requesting resources for the direct link BSR. ### Claim 6 (depends on 1) The base station according to claim 1, wherein the direct link BSR is a first type of direct link BSR or a second type of direct link BSR that is shorter in data length than the first type of direct link BSR. ### Claim 7 (depends on 1) The base station according to claim 1, wherein at most one (1) direct link BSR MAC control element including the direct link BSR and one (1) BSR MAC control element including the uplink BSR are transmitted in a MAC Protocol Data Unit (PDU). ### Claim 8 (depends on 1) The base station according to claim 1, wherein the direct link BSR is transmitted on Uplink Shared Channel (UL-SCH) resources, which are different from the D2D resources. ### Claim 9 (depends on 1) The base station according to claim 1, wherein the uplink BSR is transmitted in a MAC Protocol Data Unit (PDU) even when both of the uplink BSR and the direct link BSR are triggered. ### Claim 10 (depends on 1) The base station according to claim 1, wherein one uplink BSR and one direct link BSR are transmitted in a MAC Protocol Data Unit (PDU) even when both of the uplink BSR and the direct link BSR are triggered. ### Claim 11 A communication method comprising: receiving from a communication apparatus a direct link BSR, wherein the direct link Buffer Status Report (BSR) is a message that informs the base station of an amount of D2D data to be transmitted from the communication apparatus to a destination user equipment; and transmitting to the communication apparatus a D2D grant that schedules D2D resources for the D2D data; wherein an uplink BSR has a higher priority in resource scheduling than the direct link BSR, the uplink BSR being a message that informs the base station of an amount of uplink data to be transmitted from the communication apparatus to the base station. ### Claim 12 (depends on 11) The communication method according to claim 11, wherein the direct link BSR is transmitted in a direct link BSR MAC control element with an index identifying a type of the D2D data and/or with a MAC header that includes a logical channel ID. ### Claim 13 (depends on 11) The communication method according to claim 11, wherein the D2D resources are a set of subframes for the D2D communication. ### Claim 14 (depends on 11) The communication method according to claim 11, wherein the direct link BSR includes the amount of D2D data and one or more additional pieces of information relating to the D2D communication. ### Claim 15 (depends on 11) The communication method according to claim 11, comprising receiving from the communication apparatus a Scheduling Request (SR) requesting resources for the direct link BSR. ### Claim 16 (depends on 11) The communication method according to claim 11, wherein the direct link BSR is a first type of direct link BSR or a second type of direct link BSR that is shorter in data length than the first type of direct link BSR. ### Claim 17 (depends on 11) The communication method according to claim 11, wherein at most one (1) direct link BSR MAC control element including the direct link BSR and one (1) BSR MAC control element including an uplink BSR are transmitted in a MAC Protocol Data Unit (PDU). ### Claim 18 (depends on 11) The communication method according to claim 11, wherein the direct link BSR is transmitted on Uplink Shared Channel (UL-SCH) resources, which are different from the D2D resources. ### Claim 19 (depends on 11) The communication method according to claim 11, wherein the uplink BSR is transmitted in a MAC Protocol Data Unit (PDU) even when both of the uplink BSR and the direct link BSR are triggered. ### Claim 20 (depends on 11) The communication method according to claim 11, wherein one uplink BSR and one direct link BSR are transmitted in a MAC Protocol Data Unit (PDU) even when both of the uplink BSR and the direct link BSR are triggered.