X50-20071105-020 QCOM X.P0054-610 DHCP and DNS lookup

							 1
 2
 3     Title:                      DHCP and DNS Lookup for UMB-HRPD Handoff
 4
 5
 6     Abstract:                   This contribution proposed a method    to discover the IP address of the
 7                                 HRPD AN that is used for pre-establish the HRPD session and PPP
 8                                 session before the AT switches its active air-interface to HRPD.
 9
10
11     Source:

12                                 Peerapol Tinnakornsrisuphap/Jun Wang
13                                 QUALCOMM Inc.
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18     Date:                       November 05, 2007
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20     Recommendation:             Review and adopt it in X.P00xx-610.

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 1   2. References
 2


 3   2.1   Normative References
 4           [1]   IETF: RFC 2131, R. Droms, et al. ‘Dynamic Host Configuration Protocol’, March 1997.
 5           [2]   IETF: RFC 2132, S. Alexander, et al. ‘DHCP Options and BOOTP Vendor Extensions’,
 6                 March 1997.
 7           [3]   IETF: RFC 3315, R. Droms, Ed. et al. ‘Dynamic Host Configuration Protocol for IPv6
 8                 (DHCPv6)’, July 2003
 9           [4]   IETF: RFC 3646, R. Droms, Ed. ‘DNS Configuration options for Dynamic Host
10                 Configuration Protocol for IPv6 (DHCPv6)’, December 2003.
11           [5]   3GPP2: C.S0024
12           [6]   3GPP2: X.0054-100
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14


15   2.2   Informative References
16           1.    xxx

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 1   4.     HRPD AN Discovery
 2              During UMB-HRPD active handoff, the AT needs to discover the IP address of the HRPD AN that
 3              is used to pre-establish the HRPD session and PPP session before the AT switches its active
 4              air-interface to HRPD. The HRPD AN IP address discovery occurs in two steps. The first step
 5              (section 4.1) is HRPD AN Domain Name Discovery where the AT discovers the domain name that
 6              the AT will use in the formation of a FQDN when handoff is required. This step may occur as part
 7              of IP address assignment of the AT during power-up. The next step (section 4.2) is the AT uses the
 8              FQDN to perform DNS query for resolution of HRPD AN IP address. This step should occur when
 9              the HRPD session establishment through the inter-technology tunnel is required.


10   4.1    HRPD AN Domain Name Discovery
11              This section defines requirements for the HRPD AN Domain Name Discovery. The AT should
12              discover the HRPD Operator Domain Name via DHCP using DHCP Pption or DHCPv6 Option.
13              Upon discovery of HRPD AN Domain Name, the AT shall use the discovered domain name for
14              HRPD AN IP address resolution (see section 4.2).

15        4.1.1 DHCPv4 Option
16              The AT uses the DHCPINFORM message to acquire HRPD AN domain name using DHCP
17              Option 15 (see [2]).

18              The DHCP server includes HRPD AN Domain Name in Domain Name Option in the DHCPACK
19              message to send HRPD AN Domain Name to the AT.

20          4.1.1.1     AT Requirements

21              See [6] for DHCP requirements on the AT.

22              The AT shall support DHCP Option 15 as specifred in [2] if the HRPD AN Domain Name
23              Discovery is used to discover HRPD domain name.

24              The AT shall use the DHCPINFORM message to acquire the domain name of the HRPD AN as per
25              [2].

26          4.1.1.2     DHCP Server Requirements

27              Upon receiving a DHCPINFORM message or a Relay message containing a DHCPINFORM
28              message, if the DHCP server is configured with the Domain Name information, the DHCP server
29              shall respond with DHCPACK which includes the Domain Name using DCHP Opton 15 as
30              defined in [2].

31        4.1.2 DHCPv6 Option
32              The AT uses Option-Request-Option in the INFORMATION-REQUEST message with option
33              code set for requesting Domain Search List Option (see [4] and [3]).

34              The DHCPv6 server includes Domain Search List Option in the REPLY message to send Domain
35              Name list to the AT.
 1             4.1.2.1       AT Requirements

 2                 The AT shall support DHCPv6 Domain Search List Option as specifed in [4] if the HRPD AN
 3                 Domain Name Discovery is used to discover HRPD domain name.

 4                 See [6] for additional DHCPv6 requirements for the AT.

 5                 If the AT sends INFORMATION-REQUEST message to request Domain Name, the AT shall use
 6                 Option-Request-Option in the INFORMATION-REQUEST message with option-code set to 24
 7                 for requesting domain serch name list (see [4] and [3]).

 8   4.1.2.2                 DHCPv6 Server Requirements

 9                 See [6] for additional DHCPv6 server requirements.

10                 Upon receiving an Information-Request message or a Relay-Forward message containing an
11                 Information-Request message containing an Option-Request-Option indicating domain search list,
12                 the DHCPv6 server shall include in a Reply the Domain Search List Option.


13      4.2    HRPD AN IP Address Resolution
14                 The AT resolves the IP address of the HRPD AN for establishing inter-technology handoff tunnel
15                 by performing a DNS query on the following FQDN.
16                 The AT shall form the FQDN as follows for DNS query:
17                 <HRPD-sectorID-LSB24>.<HRPD-sectorID-MSB104>.RAN.HRPD.<domain-name>
18                 where:
19                       -    <domain-name> is discovered via DHCP (section 4.1 and section 4.2)
20                       -    <HRPD-sectorID-MSB104> is the hex representation in ASCII of the 104 MSBs of
21                            HRPD sectorID of the HRPD pilot provided to the AT via the HRPD air-interface (See
22                            [5]).
23                       -    <HRPD-sectorID-LSB24> is the hex representation in ASCII of the 24 LSBs of HRPD
24                            sectorID of the HRPD pilot provided to the AT via the HRPD air-interface (See [6]).
25