Signaling of system information to MTC-devices

Patent metadata

Field	Value
Publication number	US-9668162-B2
Application number	US-201313980986-A
Country	US
Kind code	B2
Filing date	Jun 20, 2013
Priority date	Apr 15, 2013
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

Network node and UE, and methods therein for signaling system information, SI, to UEs. The method in the network node comprises transmitting SI to one or more UEs, where the SI comprises multiple alternative sets, where each set assigns different values to one or multiple radio system parameters. The method further comprises determining which set, out of the multiple alternative sets, that should currently be applied for a UE, and transmitting an SI selection signal to the UE, the SI selection signal indicating the determined set,
thus enabling the UE to apply currently appropriate radio system parameters also in unfavorable radio conditions. The UE may be an MTC device (Machine Type Communication).

First claim

The invention claimed is:

1. A method for updating system information, performed by a network node in a wireless communication system, the method comprising:
transmitting multiple alternative sets of system information, SI, from the network node to one or more User Equipments, UEs, the multiple alternative sets comprising different respective values for at least one common radio system parameter, wherein the at least one common radio system parameter is for cell access by the UE or for cell barring;
determining to bar system access by a first group of UEs while permitting system access by a second group of UEs;
determining a set, among the multiple alternative sets, to be applied by the first group of UEs to bar access by the first group of UEs; and
transmitting an SI selection signal from the network node to the UE, the SI selection signal indicating the determined set to be applied by the UE.

2. The method of claim 1 , wherein the UE is a Machine Type Communication, MTC, device.

3. A method for updating system information, performed by a User equipment, UE, in a wireless communication system, the method comprising:
receiving multiple alternative sets of system information, SI, from a network node, the multiple alternative sets comprising different respective values for at least one common radio system parameter, wherein the at least one common radio system parameter is for cell access by the UE or for cell barring;
receiving an SI selection signal from the network node, the SI selection signal indicating one of the alternative sets and being adapted to selectively bar system access by a first group of UEs while permitting system access by a second group of UEs; and
responsive to receiving the SI selection signal, applying the set indicated by the SI selection signal to bar system access by the UE.

4. The method of claim 3 , wherein the UE is a Machine Type Communication, MTC, device.

5. The method of claim 1 , wherein determining the set comprises determining that a first alternative set among the multiple alternative sets should be applied by the UE, and wherein transmitting the SI selection signal comprises transmitting a first synchronization signal from the network node to the UE responsive to determining that the first alternative set should be applied by the UE, and wherein the first synchronization signal indicates that the first alternative set should be applied by the UE thus enabling the UE to apply the radio system parameter with a first value included in the first alternative set, the method further comprising:
after transmitting the first synchronization signal, determining that a second alternative set among the multiple alternative sets should be applied by the UE; and
responsive to determining the second alternative set should be applied by the UE, transmitting a second synchronization signal from the network node to the UE wherein the second synchronization signal indicates that the second alternative set should be applied by the UE thus enabling the UE to apply the radio system parameter with a second value included in the second alternative set, and wherein the first and second synchronization signals are different.

6. The method of claim 5 wherein the first synchronization signal includes a first Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), wherein the second synchronization signal includes a second PSS and the SSS, wherein the first and second Primary Synchronization Signals are different, and wherein the first and second synchronization signals correspond to a same cell of the network node.

7. The method of claim 3 , wherein receiving the SI selection comprises receiving a first synchronization signal from the network node at the UE, and wherein the first synchronization signal indicates that a first alternative set among the multiple alternative sets should be applied by the UE, the method further comprising:
responsive to receiving the first synchronization signal, applying the radio system parameter with a first value included in the first alternative set for operation of the UE;
after receiving the first synchronization signal, receiving a second synchronization signal from the network node at the UE, wherein the second synchronization signal indicates that a second alternative set among the multiple alternative sets should be applied by the UE, and wherein the first and second synchronization signals are different; and
responsive to receiving the second synchronization signal, applying the radio system parameter with a second value included in the second alternative set for operation of the UE.

8. The method of claim 7 wherein the first synchronization signal includes a first Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), wherein the second synchronization signal includes a second Primary Synchronization Signal and the Secondary Synchronization Signal, wherein the first and second Primary Synchronization Signals are different, and wherein the first and second synchronization signals correspond to a same cell of the network node.

9. The method of claim 5 , wherein the first alternative set defines the first value for the radio system parameter for cell access, the second alternative set defines the second value for the radio system parameter for cell access, and the first and second values for the radio system parameter for cell access are different.

10. The method of claim 7 , wherein the first alternative set defines the first value for the radio system parameter for cell access, the second alternative set defines the second value for the radio system parameter for cell access, and the first and second values for the radio system parameter for cell access are different.

11. The method of claim 9 wherein the first alternative set defines the first value for the radio system parameter for cell barring, the second alternative set defines the second value for the radio system parameter for cell barring, and the first and second values for the radio system parameter for cell barring are different.

12. The method of claim 10 wherein the first alternative set defines the first value for the radio system parameter for cell barring, the second alternative set defines the second value for the radio system parameter for cell barring, and the first and second values for the radio system parameter for cell barring are different.

13. The method of claim 1 , wherein the first group of UEs is a group of deep coverage UEs and the second group is a group of legacy UEs.

14. The method of claim 13 , wherein the deep coverage UEs receive enhanced coverage by repetitive transmission from the network node.

15. The method of claim 13 , wherein the deep coverage UEs receive control information within a data region of an existing Long Term Evolution (LTE) carrier.

16. The method of claim 1 , further comprising:
detecting a high load in a cell, and determining to bar system access by the first group of UEs in response to detection of the high load; and
thereafter detecting a low load in the cell and determining to allow system access by the first group of UEs in response to detection of the low load.

17. A network node for updating system information, being used in a wireless communication system, the network node comprising:
a transmitter, adapted to transmit multiple alternative sets of system information, SI, from the network node to one or more User Equipments, UEs, the multiple alternative sets comprising different respective values for at least one common radio system parameter, wherein t

Assignees

• Ericsson Telefon Ab L M
• Telefonaktiebolaget Lm Ericcson (Publ)

Inventors

• Frenger Pål
• Dimou Konstantinos
• Baldemair Robert
• Bergman Johan
• Eriksson Erik

Classifications

• H04W48/08

  Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) · CPC title

• H04W28/0215 Primary

  based on user or device properties, e.g. MTC-capable devices (services for machine-to-machine communication [M2M] or machine type communication [MTC] H04W4/70; wireless resource selection or allocation plan definition based on terminal or device properties H04W72/51) · CPC title

• H04W48/12

  using downlink control channel · CPC title

• H04W4/005

  Electricity · mapped topic

• H04W4/06

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