1. A method comprising:
receiving a request to establish an end-to-end network communication session between a subscriber unit in a wireless communication system and a data network access server through a first basestation;
determining whether the received request is a request for a new session or a request to handoff an existing session from a second basestation wherein determining comprises analyzing attribute-value pair(s) (AVP) of the received request to identify a callType AVP and identifying the received request as a request for a new session if an identified callType AVP associated with the received request denotes a new call;
generating, if the received request is a request for a new session, a communication session identifier that follows the session and the subscriber unit as the subscriber unit moves from one basestation coverage area to another basestation coverage area;
authenticating, if the request is a request to handoff the existing session, an existing communication session identifier received with the request; and
wherein generating the communication session identifier further comprises:
composing a deterministic element of the communication session identifier;
composing a random element of the communication session identifier; and
employing a mathematical function to generate the communication session identifier using the deterministic element and the random element.
2. The method of claim 1, wherein the deterministic element is comprised of one or more of an electronic serial number (ESN) of the accessing subscriber unit, a media access control (MAC) address of the subscriber unit, andor a telephone number associated with the subscriber unit.
3. The method of claim 1, wherein the random element is comprised of one or more of a pseudo-random number, andor a true random number generated from radio frequency (RF) energy of thermal noise associated with the communication session.
4. The method of claim 1, wherein the mathematical function employed concatenates the deterministic element and the random element to generate the communication session identifier.
5. The method of claim 1, wherein the mathematical function employed generates a hash of the deterministic element and the random element to generate the communication session identifier.
6. An apparatus comprising:
a network interface to receive a request for an end-to-end network communication session between a wireless communication system subscriber unit and the apparatus through a first basestation;
a memory to store a communications agent to analyze attribute-value pair(s) (AVP) of a received incoming call request control command and identify, a callType AVP to determine whether the received request is a request for a new session or a request to handoff an existing session from a second basestation;
a session identification generator, invoked by the communications agent if the received request is a request for a new session, to generate a communication session identifier that follows the session and the subscriber unit as the subscriber unit moves from one basestation coverage area to another basestation coverage area;
a security module, invoked by the communications agent if the request to handoff the existing session, to authenticate an existing communication session identifier with the request; and
wherein the session identification generator further composes a deterministic element of the communication session identifier; a random element of the communication session identifier; and
employs a mathematical function to generate the communication session identifier using the deterministic element and the random element.
7. The apparatus of claim 6, wherein the communication session identifier generated by the session identification generator comprises at least a deterministic element and a random element.
8. The apparatus of claim 7, wherein the session identification generator composes the deterministic element using one or more of an electronic serial number (ESN) of the accessing subscriber unit, a media access control (MAC) address of the subscriber unit, andor a telephone number of the subscriber unit.
9. The apparatus of claim 7, wherein the session identification generator composes the random element of the session identifier utilizing a pseudo-random number generator.
10. The apparatus of claim 7, wherein the session identification generator composes the random element of the session identifier by generating a true random number from radio frequency (RF) thermal noise.
11. An article of manufacture comprising a machine accessible storage medium having stored therein a plurality of executable instructions which, when executed by an accessing computing device, cause an electronic system to:
receive a request to establish an end-to-end network communication session between a subscriber unit in a wireless communication system and a data network access server through a first basestation;
analyze attribute-value pair(s) (AVP) of the received request and identify a callType AVP to determine whether the received request is a request for a new session or a request to handoff an existing session from a second basestation wherein the received request is identified as a request for a new session if the callType AVP is absent from the incoming call request or if an identified callType AVP associated with the received request denotes a new call;
generate, if the received request is a request for a new session, a communication session identifier that follows the session and the subscriber unit as the subscriber unit moves from one basestation coverage area to another basestation coverage area;
authenticate, if the request is a request to handoff the existing session, an existing communication session identifier received with the request; and
wherein generate the communication session identifier further comprises:
compose a deterministic element of the communication session identifier;
compose a random element of the communication session identifier; and
employs a mathematical function to generate the communication session identifier using the deterministic element and the random element.
12. The article of manufacture of claim 11 further to authenticate, if the request is a request to handoff an existing session, an existing and valid communication session identifier received with the request.
13. The article of manufacture of claim 11, wherein the communication session identifier comprises a deterministic element and a random element.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A positioning method of a warpage-preventive rail for supporting a board from below to prevent downward warpage of the board when a component is flow-soldered onto the board in a molten solder bath, the positioning method comprising the steps of:
forming a mark provided with a slit having a width approximately equal to a width, perpendicular to a dip direction, of a surface of the warpage-preventive rail facing the board, at an end of a surface opposite to a flow solder surface of the board; and
adjusting a position of the warpage-preventive rail to the slit.
2. A positioning method of a warpage-preventive rail for supporting a board from below to prevent downward warpage of the board when a component is flow-soldered onto the board in a molten solder bath, the positioning method comprising the steps of:
forming a notch having a width approximately equal to a width, perpendicular to a dip direction, of a surface of the warpage-preventive rail facing the board, at an end of a surface opposite to a flow solder surface of the board;
forming a mark around the notch; and
adjusting a position of the warpage-preventive rail to the notch.
3. The positioning method according to claim 1 or 2, wherein the mark is formed by silk-screen printing.
4. A board that is supported from below by a warpage-preventive rail for preventing downward warpage of the board when a component is flow-soldered onto the board in a molten solder bath, the board comprising:
a mark provided with a slit having a width approximately equal to a width, perpendicular to a dip direction, of a surface of the warpage-preventive rail facing the board, at an end of a surface opposite to a flow solder surface of the board.
5. A board that is supported from below by a warpage-preventive rail for preventing downward warpage of the board when a component is flow-soldered onto the board in a molten solder bath, the board comprising:
a notch having a width approximately equal to a width, perpendicular to a dip direction, of a surface of the warpage-preventive rail facing the board, at an end of a surface opposite to a flow solder surface of the board; and
a mark formed around the notch.
6. The board according to claim 4 or 5, wherein the mark is formed by silk-screen printing.