Identification of downlink messages using repeated transmission

Patent metadata

Field	Value
Publication number	US-2016345314-A1
Application number	US-201415112522-A
Country	US
Kind code	A1
Filing date	Nov 13, 2014
Priority date	Jan 30, 2014
Publication date	Nov 24, 2016
Grant date	—

Abstract

A wireless telecommunication system comprises a base station arranged to communicate messages to one or more terminal devices over a radio interface. The radio interface has a radio frame structure comprising a plurality of subframes, wherein a message may be transmitted in accordance with a first transmission scheme using transmission resources in a first number of radio subframes (e.g. one subframe) or transmitted in accordance with a second transmission scheme using transmission resources in a second number of radio subframes (e.g. with repeat transmissions in a plurality of subframes). The message is transmitted in association with an identifier to indicate a terminal device to which the message is addressed. A characteristic for the identifier, for example a value or control region search space for the identifier, is dependent on whether the message is to be transmitted in accordance with the first transmission scheme or the second transmission scheme. A terminal device to which the message is addressed determines the transmission scheme from the characteristic of the identifier and receives the message accordingly.

First claim

1 . A method of operating a base station for communicating a message to one or more terminal devices in a wireless telecommunications system over a radio interface having a radio frame structure comprising a plurality of subframes, wherein the message may be transmitted in accordance with a first transmission scheme using transmission resources in a first number of radio subframes or transmitted in accordance with a second transmission scheme using transmission resources in a second number of radio subframes, wherein the second number is greater than the first number, wherein the message is associated with an identifier to indicate a terminal device to which the message is addressed, and wherein the method comprises selecting a characteristic for the identifier in dependence on whether the message is to be transmitted in accordance with the first transmission scheme or the second transmission scheme.

2 . The method of claim 1 , wherein the first number of radio subframes comprises a single radio subframe and the second number of radio subframes comprises a plurality of radio subframes.

3 . The method of claim 1 , wherein terminal devices in the wireless telecommunications system comprise a first set of terminal devices and a second set of terminal devices, and wherein the method comprises determining whether to transmit the message in accordance with the first transmission scheme or the second transmission scheme in dependence on whether a terminal device to which the message is to be transmitted is a member of the first set of terminal devices or the second set of terminal devices.

4 . The method of claim 1 , wherein the method comprises determining whether to transmit the message in accordance with the first transmission scheme or the second transmission scheme in dependence on a radio propagation parameter associated with radio communications between the base station and a terminal device to which the message is to be transmitted.

5 . The method of claim 4 , wherein the radio propagation parameter is selected from the group comprising: a path loss; an error rate; a positive acknowledgment, ACK, signalling rate; and a negative acknowledgment signalling, NACK, rate.

6 . The method of claim 1 , wherein the method comprises determining whether to transmit the message in accordance with the first transmission scheme or the second transmission scheme in dependence on an identity and/or type of a terminal device to which the message is to be transmitted.

7 . The method of claim 1 , wherein the radio interface supports a downlink control channel for conveying control messages from the base station to terminal devices and a downlink data channel for conveying other messages from the base station to terminal devices, wherein the control messages convey information on resource allocations for the other messages on the downlink data channel, and wherein the message comprises a control message transmitted on the downlink control channel.

8 . The method of claim 1 , wherein the radio interface supports a downlink control channel for conveying control messages from the base station to terminal devices and a downlink data channel for conveying other messages from the base station to terminal devices, wherein the control messages convey information on resource allocations for the other messages on the downlink data channel, and wherein the message comprises one of the other messages transmitted on the downlink data channel.

9 . The method of claim 1 , wherein the identifier to indicate a terminal device to which the message is addressed is transmitted separately from the message.

10 . The method of claim 1 , wherein the identifier comprises a radio network temporary identifier, RNTI.

11 . The method of claim 1 , wherein the identifier is a common to a plurality of terminal devices.

12 . The method of claim 1 , wherein the message comprises a broadcast message.

13 . The method of claim 1 , wherein the message comprises a multicast message.

14 . The method of claim 1 , wherein for a given type of message the characteristic for the identifier is selected from a first predefined characteristic for the identifier associated with the given type of message and a second predefined characteristic for the identifier associated with the given type of message according to whether the message is to be transmitted in accordance with the first transmission scheme or the second transmission scheme.

15 . The method of claim 1 , wherein the message is selected from the group comprising: (i) a message associated with transmitting system information; (ii) a message associated with transmitting a paging message; (iii) a message associated with transmitting a random access response message; (iv) a message associated with transmitting power control information for an uplink control channel; (v) a message associated with transmitting power control information for an uplink data channel; and (vi) a message associated with a broadcast and/or multicast service.

16 . The method of claim 1 , wherein for a message to be transmitted in accordance with the second transmission scheme, a component of the message transmitted in one of the second number of subframes is associated with a characteristic for the identifier corresponding to that which would be used if the message were to be transmitted in accordance with the first transmission scheme.

17 . The method of claim 1 , wherein the characteristic for the identifier comprises a value for the identifier.

18 . The method of claim 1 , wherein the characteristic for the identifier comprises a search space in which a terminal device searches using the identifier to determine if a message has been addressed to the terminal device.

19 . The method of claim 1 , wherein the method comprises selecting the characteristic for the identifier from a plurality of different characteristics associated with different types of message.

20 . The method of claim 1 , wherein the characteristic for the identifier to be selected for a message to be transmitted in accordance with the second transmission scheme is defined in accordance with an operating standard for the wireless telecommunications system.

21 . The method of claim 1 , further comprising the base station pre-defining the characteristic for the identifier to be selected for a message to be transmitted in accordance with the second transmission scheme.

22 . The method of claim 21 , wherein the pre-defining the characteristic for the identifier is a value for the identifier selected from among a plurality of values.

23 . A base station for communicating a message to one or more terminal devices in a wireless telecommunications system over a radio interface having a radio frame structure comprising a plurality of subframes, wherein the base station comprises a controller unit and a transceiver unit configured to operate together such that the message may be transmitted in accordance with a first transmission scheme using transmission resources in a first number of radio subframes or transmitted in accordance with a second transmission scheme using transmission resources in a second number of radio subframes, wherein the second number is greater than the first number, wherein the message is associated with an identifier to indicate a terminal device to which the message is addressed, and wherein a characteristic for the identifier is selected in dependence on whether the message is to be transmitted in accordance

Assignees

• Sony Corp

Inventors

• Webb Matthew William
• Wakabayashi Hideji

Classifications

• H04W72/23

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

• H04W72/042

  Electricity · mapped topic

• H04W52/146

  Uplink power control · CPC title

• H04L5/0055

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title

• H04W72/0446 Primary

  Resources in time domain, e.g. slots or frames · CPC title