I found NTT/KDDI home gateway has this function.
IPv6 customer Edge router act as DHCP-pd requesting router.
And if it recieved dhcp-pd prefix , it also act as delegating router for IPv6 
interia router.
The pool would be configured from delegated prefix automatically.

Should we make the draft or presentation  which explains this feature as 
informational?
or is this well known feature?


                     +-------+-------+                     \
                     |   Service     |                      \
                     |   Provider    |                       | Service
                     |    Router     |                       | Provider
                     +-------+-------+                       | network
                             |                              /
                             | Customer                    /
                             | Internet connection
                             |
                      +------+--------+                    \
                      |     IPv6      |                     \
                      | Customer Edge |                      \
                      |    Router     |                      |
                      +----+-+---+----+                      |
          Network A        | |   |      Network B(E)         |
    ----+-------------+----+ |   +---+-------------+------+  |
        |             |      |       |             |      |  |
   +----+-----+ +-----+----+ |  +----+-----+ +-----+----+ |  |
   |IPv6 Host | |IPv6 Host | |  | IPv6 Host| |IPv6 Host | |  |
   |    H1    | |    H2    | |  |    H3    | |    H4    | |  |
   +----------+ +----------+ |  +----------+ +----------+ |  |
                             |        |             |     |  |
                      Link F |     ---+------+------+-----+  |
                             |               | Network E(B)  |
                      +------+--------+      |               | End-User
                      |     IPv6      |      |               | networks
                      |   Interior    +------+               |
                      |    Router     |                      |
                      +---+-------+-+-+                      |
          Network C       |       |   Network D              |
    ----+-------------+---+       +---+-------------+---     |
        |             |               |             |        |
   +----+-----+ +-----+----+     +----+-----+ +-----+----+   |
   |IPv6 Host | |IPv6 Host |     | IPv6 Host| |IPv6 Host |   |
   |   H5     | |   H6     |     |    H7    | |    H8    |   /
   +----------+ +----------+     +----------+ +----------+  /


Regards,
-Shishio
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