# US 2019/0173613 A1 · Reducing overhead in sidelink transmissions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173613 A1 - Document ID: US20190173613A1 - Status: Published application - Kind: A1 - Application number: 16/324,255 - Filed: 2017-08-11 - Published: 2019-06-06 - Earliest claimed: 2016-08-12 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Stefano SORRENTINO; Ricardo BLASCO SERRANO; Hieu DO - Web page: https://patentgrep.com/patent/US20190173613A1 ## CPC - H04L 1/0029: {Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling (power control H04W52/04)} - H04L 1/0038: {Blind format detection (for detection of modulation format H04L27/0012)} - H04L 5/0023: {Time-frequency-space} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 25/0222: {Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency} - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method includes receiving a first transmission; assessing a channel property of the first transmission; receiving a second transmission; determining if a corresponding channel property of the second transmission can be estimated based on the channel property of the first transmission; in response to determining that the corresponding channel property of the second transmission can be estimated based on the channel property of the first transmission by determining that transmission resources used for the first and second transmissions are sufficiently close in time and/or frequency domains that a channel property is common to both transmissions, estimating the corresponding channel property of the second transmission based on the channel property of the first transmission; and detecting the second transmission using the estimated corresponding channel property of the second transmission. ## Claims ### Claim 1 A method by a user equipment, UE, comprising: receiving a first transmission; assessing a channel property of the first transmission; receiving a second transmission; determining if a corresponding channel property of the second transmission can be estimated based on the channel property of the first transmission; in response to determining that the corresponding channel property of the second transmission can be estimated based on the channel property of the first transmission, estimating the corresponding channel property of the second transmission based on the channel property of the first transmission; and detecting the second transmission using the estimated corresponding channel property of the second transmission; wherein determining if a corresponding channel property of the second transmission can be estimated based on the channel property of the first transmission comprises determining that transmission resources used for the first and second transmissions are sufficiently close in time and/or frequency domains that a channel property is common to both transmissions. ### Claim 2 (depends on 1) The method of claim 1, further comprising: in response to determining that the corresponding channel property of the second transmission cannot be estimated based on the channel property of the first transmission, estimating the corresponding channel property of the second transmission based on the second transmission. ### Claim 3 (depends on 1) The method of claim 1, wherein estimating the corresponding channel property of the second transmission comprises estimating the corresponding channel property of the second transmission based on the channel property of the first transmission and based on the second transmission. ### Claim 4 (canceled) ### Claim 5 (canceled) ### Claim 6 (depends on 1) The method of claim 1, wherein determining if a corresponding channel property of the second transmission can be estimated based on the channel property of the first transmission comprises determining that spatial precoders used for the first and second transmissions are sufficiently close that a large scale channel property is common to both transmissions. ### Claim 7 (depends on 1) The method of claim 1, wherein determining if a corresponding channel property of the second transmission can be estimated based on the channel property of the first transmission comprises determining that the first and second transmissions comprise contiguous subframes. ### Claim 8 (depends on 1) The method of claim 1, wherein determining if a corresponding channel property of the second transmission can be estimated based on the channel property of the first transmission comprises determining that the first and second transmissions utilize the same bandwidth. ### Claim 9 (depends on 1) The method of claim 1, wherein the channel property comprises received power level, the method further comprising: in response to determining that the corresponding channel property of the second transmission cannot be estimated based on the channel property of the first transmission, adjusting an automatic gain control based on an initial portion of the second transmission. ### Claim 10 (canceled) ### Claim 11 A user equipment, UE comprising: a transceiver; at least one processor circuit; and at least one memory coupled to the at least one processor circuit and the transceiver, and storing program code that when executed by the at least one processor circuit causes the at least one processor circuit to perform operations comprising: receiving a first transmission; assessing a channel property of the first transmission; receiving a second transmission; determining if a corresponding channel property of the second transmission can be estimated based on the channel property of the first transmission; in response to determining that the corresponding channel property of the second transmission can be estimated based on the channel property of the first transmission, estimating the corresponding channel property of the second transmission based on the channel property of the first transmission; and detecting the second transmission using the estimated corresponding channel property of the second transmission; wherein determining if a corresponding channel property of the second transmission can be estimated based on the channel property of the first transmission comprises determining that transmission resources used for the first and second transmissions are sufficiently close in time and/or frequency domains that a channel property is common to both transmissions. ### Claim 12 A method by a scheduler, comprising: scheduling first and second sidelink transmissions of a wireless transmitting node such that they are close enough in a dimension that they will be regarded at a wireless receiving node as quasi co-located transmissions; and causing the wireless transmitting node to transmit the second sidelink transmission to the wireless receiving node without at least one overhead symbol that is present in the first transmission. ### Claim 13 (canceled) ### Claim 14 (depends on 8) The method of claim 8, further comprising causing the wireless transmitting node to increase a coding redundancy of the second transmission. ### Claim 15 (canceled) ### Claim 16 (canceled) ### Claim 17 (depends on 8) The method of claim 8, further comprising transmitting a data symbol in place of the at least one overhead symbol. ### Claim 18 (canceled) ### Claim 19 (canceled) ### Claim 20 An apparatus, comprising: at least one processor circuit; and at least one memory coupled to the at least one processor circuit and storing program code that when executed by the at least one processor circuit causes the at least one processor circuit to perform operations comprising: scheduling first and second sidelink transmissions of a wireless transmitting node such that they are close enough in a dimension that they will be regarded at a wireless receiving node as quasi co-located transmissions; and causing the wireless transmitting node to transmit the second sidelink transmission to the wireless receiving node without at least one overhead symbol that is present in the first sidelink transmission. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the dimension comprises time, frequency and/or space. ### Claim 22 (depends on 20) The apparatus of claim 20, wherein the at least one overhead symbol comprises one of an automatic gain control, AGC, training symbol and a guard period, GP. ### Claim 23 (depends on 20) The apparatus of claim 20, wherein the apparatus comprises a user equipment or a network node. ### Claim 24 (depends on 11) The user equipment of claim 11, wherein the at least one processor circuit estimates the corresponding channel property of the second transmission by estimating the corresponding channel property of the second transmission based on the channel property of the first transmission and based on the second transmission. ### Claim 25 (depends on 11) The user equipment of claim 11, wherein the channel property of the first transmission and the corresponding channel property of the second transmission comprise a large scale channel property. ### Claim 26 (depends on 11) The user equipment of claim 11, wherein the channel property of the first transmission and the corresponding channel property of the second transmission comprise at least one of a channel gain, a received power level, a Doppler spread, a Doppler shift and a delay spread. ### Claim 27 (depends on 1) A computer program product, comprising: a non-transitory computer readable storage medium comprising computer program instructions that, when executed on a processing circuit, cause the processing circuit to perform the method according to claim 1. ### Claim 28 (depends on 12) A computer program product, comprising: a non-transitory computer readable storage medium comprising computer program instructions that, when executed on a processing circuit, cause the processing circuit to perform the method according to claim 12.