Signaling of multiple short tti transmissions

Abstract

Systems and methods are described herein for scheduling multiple short Transmission Time Internal (sTTI) transmissions. In some embodiments, a method of operation of a network node of a wireless communication network for scheduling multiple sTTI transmissions comprises transmitting a control information message to a wireless device for two or more sTTI transmissions, wherein the control information message comprises scheduling information indicating two or more scheduled sTTIs for the two or more sTTI transmissions, respectively, and/or an indication of a timing for the two or more scheduled sTTIs for the two or more sTTI transmissions and/or an indication of a Demodulation Reference Signal (DMRS) configuration for the two or more scheduled sTTIs for the two or more sTTI transmissions. By using multi-sTTI scheduling, control signaling overhead is reduced.

1 - 51 . (canceled) 
     
     
         52 . A method of operation of a network node of a wireless communication network for scheduling multiple short Transmission Time Interval, sTTI, transmissions, comprising:
 transmitting a control information message to a wireless device for two or more sTTI transmissions;   wherein the control information message comprises:
 downlink scheduling information indicating two or more scheduled downlink sTTIs for the two or more sTTI transmissions, the downlink scheduling information including an indication of a timing for the two or more scheduled downlink sTTIs for the two or more sTTI transmissions and an indication of a number of the scheduled downlink sTTIs; and optionally 
 uplink scheduling information indicating two or more scheduled uplink sTTIs for the two or more sTTI transmissions, the uplink scheduling information including either one or both of: an indication of a timing for the two or more scheduled uplink sTTIs for the two or more sTTI transmissions; and an indication of a Demodulation Reference Signal, DMRS, configuration for the two or more scheduled uplink sTTIs for the two or more sTTI transmissions. 
   
     
     
         53 . The method of  claim 52  wherein the two or more scheduled downlink sTTIs are consecutive in the time domain, and optionally wherein the two or more scheduled uplink sTTIs are consecutive in the time domain. 
     
     
         54 . The method of  claim 52  wherein the control information message is transmitted on either a physical downlink control channel or a short physical downlink control channel. 
     
     
         55 . The method of  claim 54  wherein a short physical downlink control channel is transmitted in each downlink sTTI transmission, except for a legacy control region. 
     
     
         56 . The method of  claim 52  wherein the control information message comprises a bit field that indicates the number of scheduled downlink sTTIs. 
     
     
         57 . The method of  claim 56  wherein the two or more scheduled downlink sTTIs are determined by a fixed scheduling timing and the bit field of the control information message that indicates the number of scheduled downlink sTTIs. 
     
     
         58 . The method of  claim 56  wherein:
 a plurality of possible combinations of two or more downlink sTTIs are predefined; and 
 the bit field comprised in the control information message together with an index of a downlink sTTI transmission containing the control information message explicitly indicates one of the plurality of possible combinations of two or more downlink sTTIs as a selected combination of downlink sTTIs for the two or more sTTI transmissions. 
 
     
     
         59 . The method of  claim 58  wherein any one of:
 a Demodulation Reference Signal, DMRS, configuration for each of the plurality of possible combinations of two or more sTTI transmissions is preconfigured; 
 the control information message comprises a second bit field that indicates a Demodulation Reference Signal, DMRS, configuration for the two or more sTTI transmissions; and 
 the control information message comprises a second bit field that, together with the number of scheduled sTTIs, indicates a DMRS configuration for the two or more sTTI transmissions. 
 
     
     
         60 . The method of  claim 59  wherein the DRMS configuration comprises either one or both of: a number of DMRS symbols for the two or more scheduled sTTIs; and a number of DMRS symbol positions for the two or more scheduled sTTIs. 
     
     
         61 . The method of  claim 56  wherein:
 a plurality of possible combinations of two or more downlink sTTIs are predefined; and 
 the bit field comprised in the control information message explicitly indicates one of the plurality of possible combinations of two or more downlink sTTIs as a selected combination of downlink sTTIs for the two or more sTTI transmissions and, optionally, 
 wherein the control information message is comprised in a physical downlink control channel for a Transmission Time Interval, TTI, that comprises a plurality of sTTIs. 
 
     
     
         62 . The method of  claim 61  wherein any one of:
 a Demodulation Reference Signal, DMRS, configuration for each of the plurality of possible combinations of two or more sTTI transmissions is preconfigured; 
 the control information message comprises a second bit field that indicates a Demodulation Reference Signal, DMRS, configuration for the two or more sTTI transmissions; and 
 the control information message comprises a second bit field that, together with the number of scheduled sTTIs, indicates a DMRS configuration for the two or more sTTI transmissions. 
 
     
     
         63 . The method of  claim 62  wherein the DRMS configuration comprises either one or both of: a number of DMRS symbols for the two or more scheduled sTTIs; and a number of DMRS symbol positions for the two or more scheduled sTTIs. 
     
     
         64 . A network node for a wireless communication network for scheduling multiple short Transmission Time Interval, sTTI, transmissions, comprising:
 at least one processor; and   memory storing instructions executable by the at least one processor whereby the network node is operable to perform a method for scheduling multiple short Transmission Time Interval, sTTI, transmissions, comprising:
 transmitting a control information message to a wireless device for two or more sTTI transmissions; 
 wherein the control information message comprises:
 downlink scheduling information indicating two or more scheduled downlink sTTIs for the two or more sTTI transmissions, the downlink scheduling information including an indication of a timing for the two or more scheduled downlink sTTIs for the two or more sTTI transmissions and an indication of a number of the scheduled downlink sTTIs; and optionally 
 uplink scheduling information indicating two or more scheduled uplink sTTIs for the two or more sTTI transmissions, the uplink scheduling information including either one or both of: an indication of a timing for the two or more scheduled uplink sTTIs for the two or more sTTI transmissions; and an indication of a Demodulation Reference Signal, DMRS, configuration for the two or more scheduled uplink sTTIs for the two or more sTTI transmissions. 
 
   
     
     
         65 . A method of operation of a wireless device in a wireless communication network, comprising:
 receiving, from a network node, a control information message for two or more short Transmission Time Interval, sTTI, transmissions, wherein the control information message comprises:
 downlink scheduling information indicating two or more scheduled downlink sTTIs for the two or more sTTI transmissions, the downlink scheduling information including an indication of a timing for the two or more scheduled downlink sTTIs for the two or more sTTI transmissions and an indication of a number of the scheduled downlink sTTIs; and optionally 
 uplink scheduling information indicating two or more scheduled uplink sTTIs for the two or more sTTI transmissions, the uplink scheduling information including either one or both of an indication of a timing for the two or more scheduled uplink sTTIs for the two or more sTTI transmissions; and an indication of a Demodulation Reference Signal, DMRS, configuration for the two or more scheduled uplink sTTIs for the two or more sTTI transmissions; and 
   transmitting and/or receiving the two or more sTTI transmissions in accordance with the control information message.   
     
     
         66 . A wireless device for a wireless communication network, comprising:
 at least one transceiver; and   circuitry associated with the at least one transceiver, the circuitry operable to:
 receive, from a network node via the at least one transceiver, a control information message for one or more short Transmission Time Interval, sTTI, transmissions, wherein the control information message comprises:
 downlink scheduling information indicating one or more scheduled downlink sTTI for the one or more sTTI transmissions, the downlink scheduling information including an indication of a timing for the two or more scheduled downlink sTTIs for the two or more sTTI transmissions and an indication of a number of scheduled downlink sTTIs; and optionally 
 uplink scheduling information indicating two or more scheduled uplink sTTIs for the two or more sTTI transmissions, the uplink scheduling information including either one or both of an indication of a timing for the two or more scheduled uplink sTTIs for the two or more sTTI transmissions; and an indication of a Demodulation Reference Signal, DMRS, configuration for the two or more scheduled uplink sTTIs for the two or more sTTI transmissions; and 
 
 transmit and/or receive, via the at least one transceiver, the one or more sTTI transmissions in accordance with the control information message. 
   
     
     
         67 . A non-transitory computer readable medium storing computer program instructions which, when executed on at least one processor, cause the at least one processor to carry out a method for scheduling multiple short Transmission Time Interval, sTTI, transmissions, comprising:
 transmitting a control information message to a wireless device for two or more sTTI transmissions;   wherein the control information message comprises:
 downlink scheduling information indicating two or more scheduled downlink sTTIs for the two or more sTTI transmissions, the downlink scheduling information including an indication of a timing for the two or more scheduled downlink sTTIs for the two or more sTTI transmissions and an indication of a number of the scheduled downlink sTTIs; and optionally 
 uplink scheduling information indicating two or more scheduled uplink sTTIs for the two or more sTTI transmissions, the uplink scheduling information including either one or both of: an indication of a timing for the two or more scheduled uplink sTTIs for the two or more sTTI transmissions; and an indication of a Demodulation Reference Signal, DMRS, configuration for the two or more scheduled uplink sTTIs for the two or more sTTI transmissions.