System and method for improving spectral efficiency and coverage for user equipments

Patent metadata

Field	Value
Publication number	US-2016100422-A1
Application number	US-201514868189-A
Country	US
Kind code	A1
Filing date	Sep 28, 2015
Priority date	Oct 1, 2014
Publication date	Apr 7, 2016
Grant date	—

Abstract

Methods and apparatus are provided to improve spectral efficiency, coverage, and data rates for communication between a base station and user equipments (UEs). In a first case, mechanisms to reduce a size of a random access response message are provided. In a second case, mechanisms to support UE-group scheduling are provided. In a third case, control signaling designs according to a coverage requirement for a UE are provided. In a fourth case, designs for allocation of downlink (DL) subframes and uplink (UL) subframes in order to adjust a data rate and minimize switching between DL and UL for a half-duplex FDD UE are provided.

First claim

What is claimed is:

1 . A base station comprising:
a controller configured to generate a first random access response (RAR) message or a second RAR message; and a transmitter configured to transmit the first RAR message or the second RAR message, wherein a size of an information element (IE) in the second RAR message is smaller than a size of the IE in the first RAR message.

2 . The base station of claim 1 , wherein the first RAR message triggers a transmission of an Msg3 from the UE of the first type over one subframe and the second RAR message triggers a transmission of an Msg3 from the UE of the second type over multiple subframes.

3 . The base station of claim 1 , wherein the IE is a frequency hopping (FH) flag for a transmission of an Msg3, the FH flag has a size of one binary element in the first RAR message, and the FH flag is not included in the second RAR message.

4 . The base station of claim 1 , wherein the IE is a transmission power control (TPC) command for a transmission of an Msg3, the TPC has a size of three binary elements in the first RAR message, and the TPC command is not included in the second RAR message.

5 . The base station of claim 1 , wherein the IE is an UL delay for a transmission of an Msg3, the UL delay has a size of one binary element in the first RAR message, and the UL delay is not included in the second RAR message.

6 . The base station of claim 1 , wherein the IE is temporary cell radio network temporary identifier (TC-RNTI), the TC-RNTI has a size of sixteen binary elements in the first RAR message, and the TC-RNTI is not included in the second RAR message.

7 . A base station comprising:
an encoder configured to encode a first downlink control information (DCI) format or a second DCI format; and a transmitter configured to transmit information configuring a user equipment (UE) to receive either the first DCI format or the second DCI format and to transmit the first DCI format or the second DCI format, wherein both the first DCI format and the second DCI format schedule either data transmission to the UE or data transmission from the UE and correspond to a same data transmission mode, and wherein a size of an information element (IE) in the second DCI format is smaller than a size of the IE in the first DCI format.

8 . The base station of claim 7 , wherein the IE indicates a number of hybrid automatic repeat request (HARQ) processes and both the first DCI format and the second DCI format schedule data transmission.

9 . The base station of claim 7 , wherein the IE indicates a redundancy version (RV), the RV has a size of two binary elements in the first DCI format, the RV is not included in the second DCI format, and both the first DCI format and the second DCI format schedule data transmission.

10 . The base station of claim 7 , wherein the IE indicates a downlink assignment index (DAI), the DAI has a size of two binary elements in the first DCI format, the DAI is not included in the second DCI format, and both the first DCI format and the second DCI format schedule data transmission.

11 . A user equipment comprising:
a receiver configured to receive information configuring reception of either a first downlink control information (DCI) format or a second DCI format and to receive the first DCI format or the second DCI format, wherein both the first DCI format and the second DCI format schedule either data transmission to the user equipment or data transmission from the user equipment and correspond to a same data transmission mode, and wherein a size of an information element (IE) in the second DCI format is smaller than a size of the IE in the first DCI format; and a decoder configured to decode the first DCI format or the second DCI format.

12 . The user equipment of claim 11 , wherein the IE indicates a number of hybrid automatic repeat request (HARQ) processes and both the first DCI format and the second DCI format schedule data transmission.

13 . The user equipment of claim 11 , wherein the IE indicates a redundancy version (RV), the RV has a size of two binary elements in the first DCI format, the RV is not included in the second DCI format, and both the first DCI format and the second DCI format schedule data transmission.

14 . The user equipment of claim 11 , wherein the IE indicates a downlink assignment index (DAI), the DAI has a size of two binary elements in the first DCI format, the DAI is not included in the second DCI format, and both the first DCI format and the second DCI format schedule data transmission.

15 . A method comprising:
transmitting, by a base station, a first random access response (RAR) message to a user equipment (UE) of a first type in response to a detection of a first random access (RA) preamble from the UE of the first type; and transmitting, by the base station, a second RAR message to a UE of a second type in response to a detection of a second RA preamble from the UE of the second type wherein a size of an information element (IE) in the second RAR message is smaller than a size of the IE in the first RAR message.

16 . The method of claim 15 , wherein the IE is an UL delay for a transmission of an Msg3, the UL delay has a size of one binary element in the first RAR message, and the UL delay is not included in the second RAR message.

17 . The method of claim 15 , wherein the IE is temporary cell radio network temporary identifier (TC-RNTI), the TC-RNTI has a size of sixteen binary elements in the first RAR message, and the TC-RNTI is not included in the second RAR message.

18 . A method comprising:
transmitting, by a base station to a user equipment (UE), information configuring the UE to receive a first downlink control information (DCI) format or a second DCI format; and transmitting, by the base station, either the first DCI format or the second DCI format, wherein both the first DCI format and the second DCI format schedule either data transmission to the UE or data transmission from the UE and correspond to a same data transmission mode, and wherein a size of an information element (IE) in the second DCI format is smaller than a size of the IE in the first DCI format.

19 . The method of claim 18 , wherein the IE indicates a redundancy version (RV), the RV has a size of two binary elements in the first DCI format, the RV is not included in the second DCI format, and both the first DCI format and the second DCI format schedule data transmission.

20 . The method of claim 18 , wherein the IE indicates a downlink assignment index (DAI), the DAI has a size of two binary elements in the first DCI format, the DAI is not included in the second DCI format, and both the first DCI format and the second DCI format schedule data transmission.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Papasakellariou Aris
• Ng Boon Loong

Classifications

• H04W72/23 Primary

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

• H04L1/0072 Primary

  Error control for data other than payload data, e.g. control data · CPC title

• H04L1/22

  using redundant apparatus to increase reliability · CPC title

• H04L1/1861

  Physical mapping arrangements (for ACK signaling see also H04L5/0053) · CPC title

• H04W28/06

  Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} · CPC title