# US 2014/0192734 A1 · Methods to support inter-enodeb comp > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192734 A1 - Document ID: US20140192734A1 - Status: Published application - Kind: A1 - Application number: 14/148,467 - Filed: 2014-01-06 - Published: 2014-07-10 - Earliest claimed: 2013-01-09 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Boon Loong Ng; Young-Han Nam; Thomas David Novlan - Web page: https://patentgrep.com/patent/US20140192734A1 ## CPC - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04L 5/0042: {Intra-user or intra-terminal allocation} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method of executing inter-eNB CoMP JT between a CoMP UE and multiple CoMP eNBs is disclosed. A first CoMP eNB constructs a first set of dynamic control information (DCI). The first set of DCI is independently constructed by the first CoMP eNB. The first CoMP eNB transmits the first set of DCI to the CoMP UE. The first set of DCI includes independent DL assignments allowing the first CoMP eNB to perform independent scheduling of a PDSCH associated with the first CoMP eNB. A second CoMP eNB constructs a second set of DCI. The second set of DCI is independently constructed by the second CoMP eNB. Furthermore, the second CoMP eNB transmits the second set of DCI to the CoMP UE. The second set of DCI includes independent DL assignments allowing the second CoMP eNB to perform independent scheduling of a PDSCH associated with the second CoMP eNB. ## Claims ### Claim 1 A method of executing inter-eNodeB (eNB) coordinated multi point (CoMP) joint transmission (JT) between a CoMP user equipment (UE) and two or more CoMP eNBs, the method comprising: constructing, by a first CoMP eNB of the two or more CoMP eNBs, a first set of dynamic control information (DCI), wherein the first set of DCI is independently constructed by the first CoMP eNB; transmitting, by the first CoMP eNB, the first set of DCI to the CoMP UE, wherein the first set of DCI comprises independent downlink (DL) assignments allowing the first CoMP eNB to perform independent scheduling of a physical downlink shared channel (PDSCH) associated with the first CoMP eNB; constructing, by a second CoMP eNB of the two or more CoMP eNBs, a second set of DCI, wherein the second set of DCI is independently constructed by the second CoMP eNB; and transmitting, by the second CoMP eNB, the second set of DCI to the UE, wherein the second set of DCI comprises independent downlink (DL) assignments allowing the second CoMP eNB to perform independent scheduling of a PDSCH associated with the second CoMP eNB. ### Claim 2 (depends on 1) The method of claim 1, wherein each of the two or more CoMP eNBs are configured to transmit a single transport block (TB) to the UE on the same carrier, wherein each of the transport blocks are mapped to a codeword to identify that each of the two or more CoMP eNBs are transmitting a single TB to the UE, and wherein each TB is carried by the PDSCH associated with the eNB transmitting the TB. ### Claim 3 (depends on 1) The method of claim 1, wherein each of the two or more eNBs are configured to transmit as many as two transport blocks (TB) to the UE on the same carrier. ### Claim 4 (depends on 3) The method of claim 3, wherein each of the transport blocks are mapped to a codeword distinguishing a first TB from a second TB transmitted by each of the two or more CoMP eNBs to the UE, and wherein at least one TB is carried by the PDSCH associated with the eNB transmitting the TB. ### Claim 5 (depends on 1) The method of claim 1, further comprising initiating inter-eNB CoMP JT by the configuration of a new transmission mode. ### Claim 6 (depends on 1) The method of claim 1, further comprising initiating inter-eNB CoMP JT when the UE recognizes the simultaneous configuration of multiple transmission modes for a single carrier. ### Claim 7 A method of executing inter-eNodeB (eNB) coordinated multi point (CoMP) between a CoMP user equipment (UE) and two or more CoMP eNBs, the method comprising: configuring the CoMP UE with a first cell radio network temporary identifier (C-RNTI) associated with a primary CoMP eNB of the two or more eNBs; configuring the CoMP UE with a second C-RNTI associated with a secondary CoMP eNB of the two or more eNBs; and determining, by the CoMP UE, at least one of a CoMP UE specific search space for a physical downlink control channel / enhanced physical downlink control channel (PDCCH/EPDCCH), a scrambling of a cyclic redundancy check (CRC) of the PDCCH/EPDCCH for each eNB of the two or more eNBs, or a scrambling of a physical downlink shared channel (PDSCH) for each eNB of the two or more eNBs based at least on the first C-RNTI and the second C-RNTI. ### Claim 8 (depends on 7) The method of claim 7, wherein determining, by the primary CoMP eNB, the specific C-RNTI for the secondary CoMP comprises: selecting, by the secondary CoMP eNB, the specific C-RNTI; forwarding, by the secondary CoMP eNB, the specific C-RNTI to the primary CoMP eNB; and including, by the secondary CoMP eNB, the specific C-RNTI in an inter-eNB CoMP higher layer configuration message to be sent to the CoMP UE. ### Claim 9 (depends on 7) The method of claim 7, wherein determining, by the primary CoMP eNB, the specific C-RNTI for the secondary CoMP comprises: forwarding, by the primary CoMP eNB, the specific C-RNTI to the secondary CoMP eNB, wherein the specific C-RNTI is to be used for data transmission between the secondary CoMP eNB and the CoMP UE; checking, by the secondary CoMP eNB, the specific C-RNTI, after receiving the specific C-RNTI from the primary CoMP eNB, to determine if the C-RNTI has been previously used by another UE currently being served by the secondary CoMP eNB; selecting, by the secondary CoMP eNB, a new C-RNTI for the CoMP UE and forwarding the new C-RNTI to the primary CoMP eNB so that the primary CoMP eNB can comprise the new C-RNTI in an inter-eNB CoMP higher layer configuration message to be sent to the CoMP UE, if the secondary CoMP eNB determines that the specific C-RNTI is currently being used for another UE; transmitting, by the secondary CoMP eNB, an acknowledgement of the reception of the specific C-RNTI to the primary CoMP eNB, if the secondary CoMP eNB determines that the specific C-RNTI is not currently being used for the other UE. ### Claim 10 A method of allocating physical resource blocks (PRBs) between at least a first coordinated multi point (CoMP) eNodeB (eNB) and a second CoMP eNB each participating in inter-eNB CoMP joint transmission (JT) such that a first set of one or more PRBs allocated for the first CoMP eNB does not overlap with a second set of one or more PRBs allocated for the second CoMP eNB, the method comprising: transmitting a message, from the first CoMP eNB to the second CoMP eNB, identifying an indicated set of PRBs that the second CoMP eNB should not use to schedule data transmissions with a CoMP user equipment (UE) using the second C-RNTI; selecting, by the second CoMP eNB, the demodulation reference signal (DM-RS) ports for data transmission with the CoMP UE; and transmitting data, by the second CoMP eNB, to the CoMP UE using PRBs which do not comprise the indicated set of PRBs. ### Claim 11 (depends on 10) The method of claim 10, wherein the first CoMP eNB is able to identify the indicated set of PRBs for the second CoMP eNB based on a higher signal measurement metric measured by the CoMP UE for the first CoMP eNB than signal measurement metric measured by the CoMP UE for the second CoMP eNB and wherein the second CoMP eNB uses the indicated set of PRBs for another UE not participating in inter-eNB CoMP JT. ### Claim 12 (depends on 10) The method of claim 10, wherein the indicated set of PRBs is for at least a subset of subframes of the PRBs. ### Claim 13 (depends on 10) The method of claim 10, wherein subframes of the indicated set of PRBs are partitioned into a first set of subframes and a second set of subframes such that the first set of subframes are used by the first CoMP eNB for data transmission to the CoMP UE and the second set of subframes are used only by the second CoMP eNB for data transmission to the CoMP UE. ### Claim 14 (depends on 13) The method of claim 13, wherein the first set of subframes and the second set of subframes are partitioned based on an almost blank subframe (ABS) pattern message. ### Claim 15 (depends on 10) The method of claim 10, wherein the message from the first CoMP eNB to the second CoMP eNB comprises a maximum number of transmission layers for a PRB that can be assigned to the CoMP UE. ### Claim 16 A method of independently allocating physical resource blocks (PRBs) by a first coordinated multi point (CoMP) eNodeB (eNB) and a second CoMP eNB participating in inter-eNB CoMP joint transmission (JT), the method comprising: predetermining, prior to CoMP eNB JT participation, for the first CoMP eNB a first set of demodulation reference signal (DM-RS) ports configured for data transmission with a CoMP user equipment (UE) and predetermining, prior to CoMP eNB JT participation, for the second CoMP eNB a second and different set of DM-RS ports configured for data transmission with the CoMP UE, wherein the DM-RS ports comprise ports used by at least partially overlapping physical resource blocks (PRBs); scheduling data transmissions by the first CoMP eNB to the CoMP UE using the first set of DM-RS ports; and scheduling data transmission by the second CoMP eNB to the CoMP UE using the second set of DM-RS ports. ### Claim 17 (depends on 16) The method of claim 16, wherein the first set of DM-RS ports and the second set of DM-RS ports are orthogonal. ### Claim 18 (depends on 16) The method of claim 16, wherein the DM-RS ports for the first CoMP eNB and the second CoMP eNB are predetermined based on an indication from downlink control information (DCI) comprising an indication of a disabled resource block for each of the first CoMP eNB and the second CoMP eNB and a new data indicator (NDI) indicating the DM-RS ports to be used for each of the first CoMP eNB and the second CoMP eNB. ### Claim 19 (depends on 16) The method of claim 16, wherein the maximum number of transmission layers transmitted per PRB by each of the first CoMP eNB and the second CoMP eNB are one, two, or four, and wherein the sum of the transmission layers of the PRBs used by the first CoMP eNB and the second CoMP eNB to transmit data to the CoMP UE does not exceed a capacity of the CoMP UE. ### Claim 20 (depends on 16) The method of claim 16, further comprising aligning, by the first CoMP eNB and the second CoMP eNB the data transmissions with a same downlink PRB to the CoMP UE when the first CoMP eNB and the second CoMP eNB are each transmitting one spatial layer to the CoMP UE.