extend swap space

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I have a RHEL box with 16G Ram and 8G swap. I want to extend the swap space to 16G (+8G).

There is not enough space for extending swap lvm so I would like to reallocate some space from /home to swap.

Please kindly advise the steps by steps for this reallocation.

Version : RHEL 7.2 workstation

$ df
Filesystem            1K-blocks     Used Available Use% Mounted on
/dev/mapper/rhel-root  52403200  8841648  43561552  17% /
devtmpfs                8063804        0   8063804   0% /dev
tmpfs                   8080448       24   8080424   1% /dev/shm
tmpfs                   8080448   429828   7650620   6% /run
tmpfs                   8080448        0   8080448   0% /sys/fs/cgroup
/dev/nvme0n1p2           508588   212216    296372  42% /boot
/dev/nvme0n1p1           204580     9964    194616   5% /boot/efi
/dev/mapper/rhel-home 188561452 63225364 125336088  34% /home
tmpfs                   1616092      136   1615956   1% /run/user/1000
/dev/sda1               3947824  3947824         0 100% /run/media/xxxx/RHEL-7.2 Server.x86_64

$ sudo lvdisplay 
[sudo] password for xxxx: 
  --- Logical volume ---
  LV Path                /dev/rhel/swap
  LV Name                swap
  VG Name                rhel
  LV UUID                nztdi1-tX67-eH1e-5W9K-r6LZ-yJYX-MM5dhm
  LV Write Access        read/write
  LV Creation host, time localhost, 2018-04-07 19:19:21 +0800
  LV Status              available
  # open                 2
  LV Size                7.81 GiB
  Current LE             2000
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

  --- Logical volume ---
  LV Path                /dev/rhel/home
  LV Name                home
  VG Name                rhel
  LV UUID                YS62cD-arv7-OJEo-D60g-eavo-Kklu-K6WPzz
  LV Write Access        read/write
  LV Creation host, time localhost, 2018-04-07 19:19:21 +0800
  LV Status              available
  # open                 1
  LV Size                179.91 GiB
  Current LE             46058
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

  --- Logical volume ---
  LV Path                /dev/rhel/root
  LV Name                root
  VG Name                rhel
  LV UUID                fAyjNt-XULs-SS61-7QrX-JLO8-aXZF-9eHGmx
  LV Write Access        read/write
  LV Creation host, time localhost, 2018-04-07 19:19:22 +0800
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

$ sudo vgs
 VG   #PV #LV #SN Attr   VSize    VFree 
  rhel   1   3   0 wz--n- <237.79g 64.00m
KT

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