Small area mbsfn enhancement

Patent metadata

Field	Value
Publication number	US-2016308684-A1
Application number	US-201515100932-A
Country	US
Kind code	A1
Filing date	Jan 2, 2015
Priority date	Jan 8, 2014
Publication date	Oct 20, 2016
Grant date	—

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be a UE. The UE determines whether the UE is located within a sub-region of an MBSFN area based on one or more parameters. The UE receives based on the determination a service over broadcast in the sub-region of the MBSFN area or over unicast outside the sub-region. In an aspect, the MBSFN area may be smaller than a unicast area. In an aspect, adaptive retransmission with a group NACK approach may be used to improve an SNR and reliability.

First claim

What is claimed is:

1 . A method of wireless communication by a user equipment (UE), comprising:
determining whether the UE is located within a sub-region of a multicast broadcast single-frequency network (MBSFN) area based on one or more parameters; and receiving, based on the determination, a service over broadcast when the UE is located within the sub-region of the MBSFN area or over unicast when the UE is not located within the sub-region, wherein the MBSFN area is smaller than a unicast area.

2 . The method of claim 1 , wherein the one or more parameters comprise:
a characteristic associated with a broadcast service, a characteristic associated with a unicast service, a timing advance value, a location of the UE, a path loss value, a parameter of the sub-region of the MBSFN area, a geometry, or a combination thereof.

3 . The method of claim 1 , wherein the UE receives the service over broadcast and the method further comprises:
switching from reception of the service over broadcast to reception of the service over unicast based on the one or more parameters.

4 . The method of claim 1 , further comprising:
receiving, from a base station, one or more thresholds associated with the one or more parameters; and switching between reception of the service over broadcast and reception of the service over unicast based on the one or more thresholds and the one or more parameters.

5 . The method of claim 1 , wherein the UE receives the service over broadcast and the method further comprises:
receiving a handover command from a base station, wherein the handover command is generated by the base station based on the one or more parameters; and switching from reception of the service over broadcast to reception of the service over unicast based on the handover command.

6 . The method of claim 1 , wherein the UE receives the service over unicast and the method further comprises:
measuring signal quality from the MBSFN area; and switching from reception of the service over unicast to reception of the service over broadcast based on the measured signal quality.

7 . The method of claim 1 , wherein the UE receives the service over unicast and the method further comprises:
performing a unicast measurement of the UE, an MBSFN measurement, or a combination thereof; transmitting the unicast measurement of the UE, the MBSFN measurement, or a combination thereof, to a base station; receiving a command from the base station to switch from reception of the service over unicast to reception of the service over broadcast based the transmission; and switching from reception of the service over unicast to reception of the service over broadcast based on the command.

8 . A method of wireless communication by a user equipment (UE), comprising:
receiving, from a base station, a retransmission indicator; receiving, from the base station, a broadcast retransmission of a signal corresponding to the retransmission indicator upon reception of the retransmission indicator; and combining the broadcast retransmission of the signal and an initial transmission of the signal previously received by the UE to decode the signal.

9 . The method of claim 8 , wherein the broadcast retransmission is performed in the same multicast channel scheduling period (MSP) as the initial transmission of the signal or a different MSP from the initial transmission of the signal.

10 . The method of claim 8 , further comprising:
receiving, from the base station, information associated with a common negative acknowledgement (NACK) resource; and transmitting a NACK via the common NACK resource to the base station when the UE fails to decode the signal, wherein the common NACK resource is shared by a group of UEs including the UE, wherein the UE receives the broadcast retransmission of the signal from the base station based on a determination by a multicast coordination entity (MCE) to retransmit the signal based on an energy metric of the transmitted NACK.

11 . The method of claim 10 , wherein the information associated with the NACK resource is received at the UE via a system information block 13 (SIB 13), a multicast control channel (MCCH), dedicated signaling, or a combination there of.

12 . The method of claim 10 , wherein the broadcast retransmission of the signal is received in one or more packets of a next MSP.

13 . The method of claim 10 , wherein the UE receives the retransmission indicator in a multicast channel scheduling information (MSI) before the broadcast retransmission to differentiate an initial transmission of the signal and the broadcast retransmission.

14 . The method of claim 8 , further comprising:
receiving information associated with a common NACK resource and a group radio network temporary identifier (G-RNTI) from the base station; and transmitting a NACK via the common NACK resource from the UE when the UE fails to decode the signal, wherein the common NACK resource is shared by a group of UEs including the UE, wherein the UE receives the broadcast retransmission of the signal based on scheduling on the G-RNTI and the retransmission indicator.

15 . A user equipment (UE) for wireless communication, comprising:
a memory; and at least one processor coupled to the memory and configured to:
determine whether the UE is located within a sub-region of a multicast broadcast single-frequency network (MBSFN) area based on one or more parameters; and
receive, based on the determination, a service over broadcast when the UE is located within the sub-region of the MBSFN area or over unicast when the UE is not located within the sub-region, wherein the MBSFN area is smaller than a unicast area.

16 . The UE of claim 15 , wherein the one or more parameters:
a characteristic associated with a broadcast service, a characteristic associated with a unicast service, a timing advance value, a location of the UE, a path loss value, a parameter of the sub-region of the MBSFN area, a geometry, or a combination thereof.

17 . The UE of claim 15 , wherein the UE receives the service over broadcast and the at least one processor is further configured to:
switch from reception of the service over broadcast to reception of the service over unicast based on the one or more parameters.

18 . The UE of claim 15 , wherein the at least one processor is further configured to:
receive, from a base station, one or more thresholds associated with the one or more parameters; and switch between reception of the service over broadcast and reception of the service over unicast based on the one or more thresholds and the one or more parameters.

19 . The UE of claim 15 , wherein the UE receives the service over broadcast and the method further comprises:
receiving a handover command from a base station, wherein the handover command is generated by the base station based on the one or more parameters; and switching from reception of the service over broadcast to reception of the service over unicast based on the handover command.

20 . The UE of claim 15 , wherein the UE receives the service over unicast and the at least one processor is further configured to:
measure signal quality from the MBSFN area; and switch from reception of the service over unicast to reception of the service over broadcast based on the measured signal quality.

21 . The UE of claim 15 , wherein the UE receives the service over unicast and the at least one processor is further configu

Assignees

• Zhu Xipeng
• Wang Jun
• Zhang Xiaoxia
• Bao Gang
• Qualcomm Inc

Inventors

• Zhu Xipeng
• Wang Jun
• Zhang Xiaoxia
• Bao Gang

Classifications

• H04W36/0011

  for data sessions of end-to-end connection · CPC title

• H04W64/00

  Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management · CPC title

• H04W4/06 Primary

  Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services · CPC title

• H04W72/30 Primary

  Resource management for broadcast services · CPC title

• H04W4/021 Primary

  Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences · CPC title