@NanduNaada
Thanks.
USB tethering with W8968 did not work. Router did not recognise the mobile.
But your reference of range extender reminded me of the old TPLink MR3020 that I earlier used and I remembered it had some AP option. Fished it out. Searched on the web and found a few videos. In AP configuration it had the option of Repeater. Seems to be working. Though MR3020 does not provide as much range as W8968, still it now provides enough signal to access from most parts of my flat.
Only downside is, to use my printer via network, I have to switch to W6968.