# US 9,882,821 B2 · System and method for information delivery with multiple point transmission > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,821 B2 - Document ID: US9882821B2 - Status: Granted - Kind: B2 - Application number: 14/613,872 - Filed: 2015-02-04 - Published: 2015-06-04 - Granted: 2018-01-30 - Earliest claimed: 2011-10-07 - Assignees: Futurewei Technologies, Inc. - Applicants: Futurewei Technologies, Inc. - Inventors: Hao Bi; Yishen Sun - Web page: https://patentgrep.com/patent/US9882821B2 ## CPC - H04L 47/34: ensuring sequence integrity, e.g. using sequence numbers - H04B 7/024: Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems - H04B 7/0417: Feedback systems - H04L 1/1841: {Resequencing} - H04L 1/1874: {Buffer management} - H04L 1/188: {Time-out mechanisms} - H04L 1/1896: {ARQ related signaling} - H04L 43/04: Processing captured monitoring data, e.g. for logfile generation - H04L 43/0829: Packet loss - H04L 43/0888: Throughput - H04L 43/16: Threshold monitoring - H04L 45/16: Multipoint routing - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A system and method for information delivery with multiple point transmission are provided. A method for detecting lost packets is provided. The method includes initiating a timer for a received packet at a receiving transmission point, where the timer is set according to a time value associated with the received packet. The method also includes determining that a delivery of the received packet has failed according to the timer elapsing, and transmitting a lost packet report to a primary transmission point that distributed the received packet to the receiving transmission point. ## Claims ### Claim 1 A method for operating a primary transmission point in a multiple point transmission system, the method comprising: distributing a plurality of packet data convergence protocol (PDCP) layer packets of a single bearer to N transmission points for transmission to a user equipment (UE), where N is an integer value greater than or equal to two, and wherein the primary transmission point is one of the N transmission points; and receiving feedback information for the PDCP layer packets distributed to a secondary transmission point of the N transmission points, from the secondary transmission point or from the UE. ### Claim 2 (depends on 1) The method of claim 1, wherein distributing the plurality of PDCP layer packets of the single bearer comprises distributing the plurality of PDCP layer packets according to a distribution rule. ### Claim 3 (depends on 2) The method of claim 2, further comprising receiving the distribution rule from a network entity. ### Claim 4 (depends on 2) The method of claim 2, further comprising adjusting the distribution rule according to the feedback information. ### Claim 5 (depends on 1) The method of claim 1, wherein the feedback information is from the secondary transmission point. ### Claim 6 (depends on 1) The method of claim 1, wherein the feedback information further comprises one or more of: available resources at the secondary transmission point, a capability of the secondary transmission point, a channel condition at the secondary transmission point, or a buffer load of the secondary transmission point. ### Claim 7 (depends on 6) The method of claim 6, wherein a number of the PDCP layer packets distributed to the secondary transmission point is decreased if the secondary transmission point is less capable. ### Claim 8 (depends on 6) The method of claim 6, wherein a number of the PDCP layer packets distributed to the secondary transmission point is increased if the secondary transmission point is more capable. ### Claim 9 (depends on 1) The method of claim 1, wherein receiving the feedback information comprises receiving a notification of a PDCP layer packet previously distributed to the secondary transmission point and of which delivery is incomplete. ### Claim 10 (depends on 9) The method of claim 9, further comprising redistributing the PDCP layer packet to one or more of the N transmission points. ### Claim 11 (depends on 9) The method of claim 9, wherein the notification is received from the secondary transmission point. ### Claim 12 (depends on 9) The method of claim 9, wherein the notification is received from the UE. ### Claim 13 (depends on 12) The method of claim 12, wherein the notification is a PDCP status report. ### Claim 14 (depends on 12) The method of claim 12, wherein the notification is received upon one or more of: a radio link control (RLC) entity is configured on the secondary transmission point, a RLC entity is released on the secondary transmission point, a RLC entity is re-established on the secondary transmission point, or a radio link failure (RLF) occurs in transmission from the secondary transmission point. ### Claim 15 (depends on 12) The method of claim 12, wherein the notification is received from the UE if a PDCP layer packet is missing for a period of time. ### Claim 16 (depends on 1) The method of claim 1, wherein receiving the feedback information comprises receiving a notification of successfully delivered PDCP layer packets previously distributed to the secondary transmission point. ### Claim 17 A primary transmission point in a multiple point transmission system, the primary transmission point comprising: a transmitter; a processor coupled to the transmitter, the processor in conjunction with the transmitter configured for distributing a plurality of packet data convergence protocol (PDCP) layer packets of a single bearer to N transmission points for transmission to a user equipment (UE), where N is an integer value greater than or equal to two, and wherein the primary transmission point is one of the N transmission points; and a receiver coupled to the processor and configured for receiving feedback information for the PDCP layer packets distributed to a secondary transmission point of the N transmission points, from the secondary transmission point or from the UE. ### Claim 18 (depends on 17) The primary transmission point of claim 17, wherein the processor in conjunction with the transmitter configured for distributing the plurality of PDCP layer packets of the single bearer comprises the processor in conjunction with the transmitter configured for distributing the plurality of PDCP layer packets according to a distribution rule. ### Claim 19 (depends on 18) The primary transmission point of claim 18, wherein the receiver is further configured for receiving the distribution rule from a network entity. ### Claim 20 (depends on 18) The primary transmission point of claim 18, wherein the processor is further configured for adjusting the distribution rule according to the feedback information. ### Claim 21 (depends on 17) The primary transmission point of claim 17, wherein the feedback information is from the secondary transmission point. ### Claim 22 (depends on 17) The primary transmission point of claim 17, wherein the feedback information further comprises one or more of: available resources at the secondary transmission point, a capability of the secondary transmission point, a channel condition at the secondary transmission point, or a buffer load of the secondary transmission point. ### Claim 23 (depends on 22) The primary transmission point of claim 22, wherein the processor in conjunction with the transmitter is configured for distributing a decreased number of the PDCP layer packets to the secondary transmission point if the secondary transmission point is less capable. ### Claim 24 (depends on 22) The primary transmission point of claim 22, wherein the processor in conjunction with the transmitter is configured for distributing an increased number of the PDCP layer packets to the secondary transmission point if the secondary transmission point is more capable. ### Claim 25 (depends on 17) The primary transmission point of claim 17, wherein the receiver configured for receiving the feedback information comprises the receiver configured for receiving a notification of a PDCP layer packet previously distributed to the secondary transmission point and of which delivery is incomplete. ### Claim 26 (depends on 25) The primary transmission point of claim 25, wherein the processor in conjunction with the transmitter is further configured for redistributing the PDCP layer packet to one or more of the N transmission points. ### Claim 27 (depends on 25) The primary transmission point of claim 25, wherein the receiver is configured for receiving the notification from the secondary transmission point. ### Claim 28 (depends on 25) The primary transmission point of claim 25, wherein the receiver is configured for receiving the notification from the UE. ### Claim 29 (depends on 28) The primary transmission point of claim 28, wherein the notification is a PDCP status report. ### Claim 30 (depends on 28) The primary transmission point of claim 28, wherein the receiver is configured for receiving the notification upon one or more of: a radio link control (RLC) entity is configured on the secondary transmission point, a RLC entity is released on the secondary transmission point, a RLC entity is re-established on the secondary transmission point, or a radio link failure (RLF) occurs in transmission from the secondary transmission point. ### Claim 31 (depends on 28) The primary transmission point of claim 28, wherein the receiver is configured for receiving the notification from the UE if a PDCP layer packet is missing for a period of time. ### Claim 32 (depends on 17) The primary transmission point of claim 17, wherein the receiver configured for receiving the feedback information comprises the receiver configured for receiving a notification of successfully delivered PDCP layer packets previously distributed to the secondary transmission point. ### Claim 33 A method for operating a secondary transmission point in a multiple point transmission system, the method comprising: receiving, by the secondary transmission point from a primary transmission point in the multiple point transmission system, a plurality of packet data convergence protocol (PDCP) layer packets of a single bearer for transmission to a user equipment; and providing, by the secondary transmission point to the primary transmission point, feedback information for the plurality of PDCP layer packets received by the secondary transmission point from the primary transmission point. ### Claim 34 (depends on 33) The method of claim 33, wherein the feedback information further comprises one or more of: available resources at the secondary transmission point, a capability of the secondary transmission point, a channel condition at the secondary transmission point, or a buffer load of the secondary transmission point. ### Claim 35 A secondary transmission point in a multiple point transmission system, the secondary transmission point comprising: a receiver configured for receiving, from a primary transmission point in the multiple point transmission system, a plurality of packet data convergence protocol (PDCP) layer packets of a single bearer for transmission to a user equipment; a processor coupled to the receiver and configured for determining feedback information for the plurality of PDCP layer packets received by the secondary transmission point from the primary transmission point; and a transmitter coupled to the processor and configured for providing, to the primary transmission point, the feedback information for the plurality of PDCP layer packets received by the secondary transmission point from the primary transmission point. ### Claim 36 (depends on 35) The secondary transmission point of claim 35, wherein the feedback information further comprises one or more of: available resources at the secondary transmission point, a capability of the secondary transmission point, a channel condition at the secondary transmission point, or a buffer load of the secondary transmission point.