System and method for using synchronization signal for demodulation reference

Patent metadata

Field	Value
Publication number	US-2016119901-A1
Application number	US-201414889925-A
Country	US
Kind code	A1
Filing date	May 7, 2014
Priority date	May 9, 2013
Publication date	Apr 28, 2016
Grant date	—

Abstract

A method of using synchronization signal as demodulation reference signal is performed at an eNB in case that the demodulation reference signal is punctured by synchronization signal in a wireless communication network. The method comprises: determining whether there is a resource element collision between the demodulation reference signal and the synchronization signal; in accordance with a determination that there is a resource element collision between the two signals: using the synchronization signal as the demodulation reference signal in a PRB pair containing the synchronization signal; and transmitting the synchronization signal as the demodulation reference signal to a UE.

First claim

1 - 19 . (canceled)

20 . For use in a wireless communication network, a method for an eNB to use a synchronization signal as a demodulation reference signal, the method comprising:
determining whether there is a resource element collision between the demodulation reference signal and the synchronization signal; in accordance with a determination that there is a resource element collision between the two signals:
using the synchronization signal as the demodulation reference signal in a PRB pair containing the synchronization signal; and
transmitting the synchronization signal as the demodulation reference signal to a UE.

21 . The method of claim 20 , further comprising:
before transmitting the synchronization signal to the UE,
generating an information element, the information element defining a signal format relationship between the synchronization signal and the demodulation reference signal; and
transmitting the information element to the UE.

22 . The method of claim 21 , wherein the information element includes at least one of an on-off switch indication, a PCID, and a power offset between the synchronization signal and the demodulation reference signal.

23 . The method of claim 22 , wherein the on-off switch indication indicates whether the synchronization signal can be used as the demodulation reference signal by the UE.

24 . The method of claim 22 , wherein, when no PCID is transmitted to the UE, the synchronization signal is assumed to be generated from the eNB for both PDSCH and EPDCCH transmission.

25 . The method of claim 22 , wherein, when only one PCID is transmitted to the UE, the synchronization signal is assumed to be generated from an eNB having that PCID for both PDSCH and EPDCCH transmission.

26 . The method of claim 22 , wherein, when multiple PCIDs are transmitted to the UE for EPDCCH transmission, each PCID being associated with one member of an EPDCCH candidate set, the synchronization signal is assumed to be generated from an eNB having that PCID associated with the corresponding EPDCCH candidate set for the EPDCCH transmission.

27 . The method of claim 22 , wherein, when multiple PCIDs are transmitted to the UE for PDSCH transmission, a dynamic selection indicator is transmitted to the UE via a downlink control channel to inform UE of which of the multiple PCIDs is applied to generate the synchronization signal for the PDSCH transmission.

28 . The method of claim 27 , wherein the dynamic selection indicator is one existing bit in the downlink control channel comprising at least one of NDI bit, n SCID bit or a combination of the two.

29 . The method of claim 22 , wherein, when no power offset is transmitted to the UE, the synchronization signal and the demodulation reference signal are deemed to have equal power.

30 . The method of claim 22 , wherein, when one power offset is transmitted to the UE, the power offset is applied to the demodulation reference signal and the synchronization signal over all layers for both PDSCH and EPDCCH transmissions.

31 . The method of claim 22 , wherein, when multiple power offsets are transmitted to the UE and each of the multiple power offsets is associated with one member of an EPDCCH candidate set, each power offset is applied to the demodulation reference signal and the synchronization signal for the corresponding member of the EPDCCH candidate set for the EPDCCH transmission.

32 . The method of claim 22 , wherein, when multiple power offsets are transmitted to the UE, a dynamic selection indicator is transmitted to the UE via a downlink control channel to inform UE of which of the multiple power offsets is applied to the demodulation reference signal and the synchronization signal for the PDSCH transmission.

33 . The method of claim 20 , wherein the synchronization signal is used as the demodulation reference signal on one logical antenna port.

34 . The method of claim 33 , wherein the logical antenna port is port 7 for PDSCH transmission.

35 . The method of claim 33 , wherein the logical antenna port is port 107 for EPDCCH transmission.

36 . The method of claim 20 , wherein the synchronization signal is used as the demodulation reference signal on one of four logical antenna ports { 107 , 108 , 109 , 110 } for EPDCCH transmission.

37 . For use in a wireless communication network, a base station including one or more processors, memory, and one or more program modules stored in the memory and executed by the one or more processors, the one or more program modules further including:
a transmission module for determining whether there is a resource element collision between the demodulation reference signal and the synchronization signal; in accordance with a determination that there is a resource element collision between the two signals: using the synchronization signal as the demodulation reference signal in a PRB pair containing the synchronization signal; and transmitting the synchronization signal as the demodulation reference signal to a UE; and a signaling module for generating an information element, the information element defining a signal format relationship between the synchronization signal and the demodulation reference signal and transmitting the information element to the UE.

Assignees

• Zte Usa Inc

Inventors

• Zhang Wenfeng
• Guo Senbao
• Sun Yunfeng
• Xia Shuqiang

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W56/0015

  one node acting as a reference for the others · CPC title

• H04W72/042 Primary

  Electricity · mapped topic

• H04L5/0094

  Indication of how sub-channels of the path are allocated · CPC title

• H04L27/261

  Details of reference signals · CPC title