Inserting virtual carrier in conventional ofdm host carrier in communications system

Patent metadata

Field	Value
Publication number	US-2023231666-A1
Application number	US-202318126536-A
Country	US
Kind code	A1
Filing date	Mar 27, 2023
Priority date	Feb 4, 2011
Publication date	Jul 20, 2023
Grant date	—

Abstract

A mobile telecommunications system including mobile terminals of first type and second type configured to transmit uplink data to a network over a radio interface using plural sub-carriers. The mobile terminals of first type configured to transmit uplink data on a first group of the sub-carriers over a first bandwidth and the mobile terminals of second type configured to transmit uplink data on a second group of the sub-carriers within the first group of sub-carrier over a second bandwidth smaller than the first bandwidth. The mobile terminals of first type transmit random access request messages to a base station of the network requesting uplink radio resources on a first random access channel. The mobile terminals of second type transmit random access request messages to the base station of the network requesting uplink radio resources on a second random access channel on sub-carriers within the second sub-carrier group.

First claim

1 . (canceled)

2 . A base station, comprising:
processing circuitry configured to
communicate with a first mobile terminal of a first type and a second mobile terminal of a second type;
receive, from the first mobile terminal, first uplink data on a first group of sub-carriers of a plurality of sub-carriers over a first bandwidth;
receive, from the second mobile terminal, second uplink data on a second group of sub-carriers of the plurality of sub-carriers, the second group of sub-carriers being within the first group of sub-carriers over a second bandwidth, and the second bandwidth being smaller than the first bandwidth;
receive, on a sub-carrier within the second group of sub-carriers, a random access request message requesting uplink radio resources on a random access channel;
transmit first downlink data on a third group of sub-carriers of the plurality of sub-carriers over a third bandwidth; and
transmit second downlink data on a fourth group of sub-carriers over a fourth bandwidth of the plurality of sub-carriers, wherein
the fourth bandwidth is different than the second bandwidth, the fourth bandwidth is smaller than the third bandwidth, and the fourth group of sub-carriers is within the third group of sub-carriers.

3 . The base station according to claim 2 , wherein the processing circuitry is further configured to transmit a signal indicating a position of the random access channel on a downlink signaling channel.

4 . The base station according to claim 2 , wherein the base station is arranged in accordance with 3GPP Long Term Evolution specifications.

5 . The base station according to claim 2 , wherein the random access request message is transmitted on a same group of sub-carriers of the first group of sub-carriers and at a same time as random access request messages transmitted on the random access channel by another mobile terminal of the first type.

6 . The base station according to claim 2 , wherein the processing circuitry is configured to receive the random access request message on the random access channel in accordance with an allocation of the random access channel, the allocation comprising a time period common to a plurality of mobile terminals of the second type and differing from an allocation for another mobile terminal of the first type.

7 . The base station according to claim 2 , wherein the random access request message comprises one of a first plurality of random access preambles, the first plurality of random access preambles being commonly allocated to a plurality of mobile terminals of the second type and differing from a second plurality of preambles for use by a mobile terminal of the first type.

8 . The base station according to claim 2 , wherein
the second group of sub-carriers of the plurality of sub-carriers form a virtual carrier inserted within the first bandwidth, and a remaining plurality of the sub-carriers of the first group of sub-carriers form a host carrier.

9 . A base station, comprising:
processing circuitry configured to
communicate with a first mobile terminal of a first type and a second mobile terminal of a second type;
receive, from the first mobile terminal, first uplink data on a first group of sub-carriers of a plurality of sub-carriers over a first bandwidth;
receive, from the second mobile terminal, second uplink data on a second group of sub-carriers of the plurality of sub-carriers, the second group of sub-carriers being within the first group of sub-carriers over a second bandwidth, and the second bandwidth being smaller than the first bandwidth;
receive, on a sub-carrier outside of the second group of sub-carriers but within remaining sub-carriers of the first group of sub-carriers, a random access request message requesting uplink radio resources on a random access channel;
transmit first downlink data on a third group of sub-carriers of the plurality of sub-carriers over a third bandwidth;
transmit second downlink data on a fourth group of sub-carriers over a fourth bandwidth, wherein
the fourth bandwidth is different than the second bandwidth, the fourth bandwidth is smaller than the third bandwidth, and the fourth group of sub-carriers is within the third group of sub-carriers.

10 . The base station according to claim 9 , wherein the processing circuitry is further configured to transmit a signal indicating a position of the random access channel on a downlink signaling channel.

11 . The base station according to claim 9 , wherein the base station is arranged in accordance with 3GPP Long Term Evolution specifications.

12 . The base station according to claim 9 , wherein the random access request message is transmitted on a same group of sub-carriers of the first group of sub-carriers and at a same time as random access request messages transmitted on the random access channel by another mobile terminal of the first type.

13 . The base station according to claim 9 , wherein the processing circuitry is configured to receive the random access request message on the random access channel in accordance with an allocation of the random access channel, the allocation comprising a time period common to a plurality of mobile terminals of the second type and differing from an allocation for another mobile terminal of the first type.

14 . The base station according to claim 9 , wherein the random access request message comprises one of a first plurality of random access preambles, the first plurality of random access preambles being commonly allocated to a plurality of mobile terminals of the second type and differing from a second plurality of preambles for use by a mobile terminal of the first type.

15 . The base station according to claim 9 , wherein
the second group of sub-carriers of the plurality of sub-carriers form a virtual carrier inserted within the first bandwidth, and the remaining sub-carriers of the first group of sub-carriers form a host carrier.

16 . A method for a base station, the method comprising:
communicating, by processing circuitry of the base station, with a first mobile terminal of a first type and a second mobile terminal of a second type; receiving, from the first mobile terminal, first uplink data on a first group of sub-carriers of a plurality of sub-carriers over a first bandwidth; receiving, from the second mobile terminal, second uplink data on a second group of sub-carriers of the plurality of sub-carriers, the second group of sub-carriers being within the first group of sub-carriers over a second bandwidth, and the second bandwidth being smaller than the first bandwidth; receiving, on a sub-carrier within the second group of sub-carriers, a random access request message requesting uplink radio resources on a random access channel; transmitting first downlink data on a third group of sub-carriers of the plurality of sub-carriers over a third bandwidth; and transmitting second downlink data on a fourth group of sub-carriers over a fourth bandwidth of the plurality of sub-carriers, wherein the fourth bandwidth is different than the second bandwidth, the fourth bandwidth is smaller than the third bandwidth, and the fourth group of sub-carriers is within the third group of sub-carriers.

17 . The method according to claim 16 , further comprising transmitting a signal indicating a position of the random access channel on a downlink signaling channel.

18 . The method according to claim 16 , wherein the random access request message is transmitted on a same group of sub-carriers of the first group of sub-carriers

Assignees

• Sca Ipla Holdings Inc

Inventors

• Mcnamara Darren
• Lillie Andrew
• Darwood Peter
• Beale Martin

Classifications

• H04W74/0833

  Random access procedures, e.g. with 4-step access · CPC title

• H04L5/0007 Primary

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L5/0064

  Rate requirement of the data, e.g. scalable bandwidth, data priority · CPC title

• H04L5/0094

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

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title