Overlay unicast or mbsfn data transmission on top of mbsfn transmission

Patent metadata

Field	Value
Publication number	US-2016013897-A1
Application number	US-201514743395-A
Country	US
Kind code	A1
Filing date	Jun 18, 2015
Priority date	Jul 11, 2014
Publication date	Jan 14, 2016
Grant date	—

Abstract

Methods, systems, and devices are described for increased wireless communications system capacity through hierarchical modulation of multiple transmission layers during certain transmission subframes in a wireless communications system. Various deployment scenarios may be supported that may provide communications modulated on both a base modulation layer as well as on an enhancement modulation layer that is superpositioned on the base modulation layer. Reference signals may be provided for channel estimation for both the base modulation layer and enhancement modulation layer.

First claim

What is claimed is:

1 . A method for wireless communications, comprising:
transmitting a multicast broadcast single frequency network (MBSFN) transmission during a first transmission period on a base modulation layer; and transmitting a unicast transmission during the first transmission period on an enhancement modulation layer that is superpositioned on the base modulation layer.

2 . The method of claim 1 , further comprising:
transmitting a reference signal for use in decoding information transmitted in the unicast transmission on the enhancement modulation layer during the first transmission period.

3 . The method of claim 2 , wherein the reference signal is a user equipment (UE) specific reference signal (UE-RS) that is transmitted by a first transmitter on the enhancement modulation layer concurrently with a transmission of a MBSFN reference signal (MBSFN-RS) that is transmitted on the base modulation layer.

4 . The method of claim 2 , wherein the reference signal punctures one or more data resource elements of the base modulation layer.

5 . The method of claim 1 , wherein both the unicast transmission and the MBSFN transmission are transmitted using an extended cyclic prefix.

6 . The method of claim 2 , wherein the reference signal is transmitted in dedicated reference signal transmission resources.

7 . The method of claim 2 , wherein the reference signal is transmitted in reference signal transmission resources shared with a physical downlink control channel (PDCCH).

8 . The method of claim 2 , wherein the unicast transmission is transmitted using a set of code blocks transmitted during the first transmission period, and a data rate for each code block of the set of code blocks is determined based at least in part on a transmission time within the first transmission period.

9 . The method of claim 8 , wherein a data rate for one or more of the code blocks is a function of a time duration between the code blocks and the reference signal.

10 . The method of claim 9 , further comprising:
transmitting control information indicating data rates for the set of code blocks.

11 . The method of claim 2 , wherein one or more other unicast transmissions are transmitted on the base modulation layer outside of the first transmission period, and wherein one or more transmission parameters of the other unicast transmissions are based at least in part on a first channel state information (CSI) report associated with transmission resources of the other unicast transmissions, and
wherein one or more transmission parameters of the unicast transmission on the enhancement modulation layer are based at least in part on a second CSI report associated with transmission resources of the enhancement modulation layer.

12 . The method of claim 11 , wherein channel estimation for the enhancement modulation layer unicast transmission is determined based at least in part on a common reference signal (CRS) and a noise estimation for the enhancement modulation layer unicast transmission is determined based at least in part on a MBSFN reference signal.

13 . A method for wireless communications, comprising:
receiving a first reference signal for use in decoding information from at least a first multicast broadcast single frequency network (MBSFN) transmission and at least one other transmission that is concurrently transmitted with the MBSFN transmission; receiving a signal comprising a multicast broadcast single frequency network (MBSFN) transmission on a base modulation layer and a second transmission on an enhancement modulation layer that is superpositioned on the base modulation layer; determining that data is to be decoded from the enhancement modulation layer; performing interference mitigation on the received signal to mitigate interference from the base modulation layer based at least in part on the received first reference signal; and decoding the enhancement modulation layer based at least in part on the received first reference signal.

14 . The method of claim 13 , wherein the at least one other transmission is a unicast transmission transmitted on the enhancement modulation layer.

15 . The method of claim 14 , further comprising:
receiving control signaling indicating timing for receiving the first reference signal and at least a second reference signal related to the unicast transmission.

16 . The method of claim 15 , wherein the second reference signal is a user equipment (UE) specific reference signal (UE-RS) that is transmitted by a first transmitter on the base modulation layer concurrently with a transmission of the first reference signal that is transmitted on the base modulation layer.

17 . The method of claim 14 , further comprising:
performing channel estimation based on the first reference signal.

18 . The method of claim 14 , wherein the unicast transmission is transmitted using a set of code blocks transmitted during a first transmission period, and a data rate for each code block of the set of code blocks is determined based at least in part on a transmission time within the first transmission period.

19 . The method of claim 14 , further comprising:
performing channel estimation for the unicast transmission transmitted on the enhancement modulation layer based at least in part on the first reference signal, wherein the first reference signal is a common reference signal (CRS); and performing a noise estimation for the unicast transmission transmitted on the enhancement modulation layer based at least in part on a MBSFN reference signal.

20 . An apparatus for wireless communications, comprising a processor, memory in electronic communication with the processor and instructions stored in the memory, the instructions being executable by the processor to:
transmit a multicast broadcast single frequency network (MBSFN) transmission during a first transmission period on a base modulation layer; and transmit a unicast transmission during the first transmission period on an enhancement modulation layer that is superpositioned on the base modulation layer.

21 . The apparatus of claim 20 , wherein the instructions are further executable by the processor to:
transmit a reference signal for use in decoding information transmitted in the unicast transmission on the enhancement modulation layer during the first transmission period.

22 . The apparatus of claim 21 , wherein the reference signal is a user equipment (UE) specific reference signal (UE-RS) that is transmitted by a first transmitter on the enhancement modulation layer concurrently with a transmission of a MBSFN reference signal (MBSFN-RS) that is transmitted on the base modulation layer.

23 . The apparatus of claim 21 , wherein the reference signal punctures one or more data resource elements of the base modulation layer.

24 . The apparatus of claim 20 , wherein both the unicast transmission and the MBSFN transmission are transmitted using an extended cyclic prefix.

25 . The apparatus of claim 21 , wherein the reference signal is transmitted in dedicated reference signal transmission resources.

26 . The apparatus of claim 21 , wherein the reference signal is transmitted in reference signal transmission resources shared with a physical downlink control channel (PDCCH).

27 . The apparatus of claim 21 , wherein the unicast transmission is transmitted using a set

Assignees

• Qualcomm Inc

Inventors

• Sun Jing
• Luo Tao
• Zhang Xiaoxia
• Malladi Durga Prasad
• Xu Hao
• Wei Yongbin

Classifications

• H04L27/2607

  Cyclic extensions · CPC title

• H04L1/0058

  Block-coded modulation · CPC title

• H04L12/18

  for broadcast or conference {, e.g. multicast} · CPC title

• H04L5/005 Primary

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title