US20030021260A1 - System and method for frame selection in IP-based CDMA network - Google Patents

System and method for frame selection in IP-based CDMA network Download PDF

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US20030021260A1
US20030021260A1 US09/916,047 US91604701A US2003021260A1 US 20030021260 A1 US20030021260 A1 US 20030021260A1 US 91604701 A US91604701 A US 91604701A US 2003021260 A1 US2003021260 A1 US 2003021260A1
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communication device
base station
access point
selector
system
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Robert Daley
Dan Vassilovski
Maria Marshall
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Qualcomm Inc
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Qualcomm Inc
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/02Communication control; Communication processing
    • H04L29/06Communication control; Communication processing characterised by a protocol
    • H04L29/0602Protocols characterised by their application
    • H04L29/06027Protocols for multimedia communication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/66Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Abstract

A wireless telephone without IP capability nonetheless communicates with an infrastructure that uses IP. Virtual IP endpoints such as base stations (BTS) not only communicate with the infrastructure using IP and with the telephone using over-the-air protocol such as CDMA, but one of the endpoints also selects the best frame over a call received by multiple endpoints, alleviating the need for a base station controller (BSC) in the infrastructure. A handoff assist entity causes frame selection to be transferred to a second BTS in accordance with a handoff algorithm.

Description

    I. FIELD OF THE INVENTION
  • The present invention relates generally to enabling a wireless telephone that is not required or generally configured to support voice over Internet Protocols (VOIP) to nonetheless communicate with wireless telephone infrastructure that uses IP structures or architectures, with IP-based communication between the wireless telephone infrastructure and any VOIP-based infrastructure being supported. [0001]
  • II. BACKGROUND OF THE INVENTION
  • Wireless telephones, such as but not limited to wireless telephones that communicate using Code Division Multiple Access (CDMA) spread spectrum modulation techniques, communicate over the air with system infrastructure using wireless telephone over-the-air communication protocols, e.g., the CDMA protocols known as IS-95A, IS-95B, and IS-2000. The system infrastructure, which can include base stations (BTS), base station controllers (BSC), and other components, connects the wireless telephone to another communication device, such as a through land line or another wireless communication system. [0002]
  • In the case of CDMA, voice data is sent over the air in packets that are collected by the infrastructure and assembled into a voice stream, transparently to the speakers who are talking to each other. As might be expected, the over-the-air protocol is tailored to optimize wireless communication. For instance, to maximize over-the-air capacity, the over-the-air protocol contains a minimum of signalling information, and the size of a voice data packet is relatively small. [0003]
  • With the growth of the Internet, computer-to-computer communication using Internet Protocols (IP) has become ubiquitous. Furthermore, it has become desirable not only to facilitate computer data communication using IP, but to facilitate voice communication using IP as well. As but one advantage afforded by using IP in a telephony infrastructure, much hardware such as switches can be eliminated, and existing computers and software can be used instead, reducing cost. To this end, so-called voice over IP (VOIP) has been introduced. [0004]
  • To support VOIP, a communication device must have, among other requirements, IP capability, i.e., the device must itself be able to communicate using IP, and it must have an IP address. [0005]
  • The present invention critically observes, however, that requiring a wireless telephone to use VOIP diminishes over-the-air capacity because VOIP is not necessarily designed to maximize such capacity. Instead, VOIP accounts for design considerations that are not necessarily related to wireless telephony. As an example, the data packet size of VOIP is relatively large, compared to the packet size used throughout the wireless communication industry such as in wireless telephones using over-the-air protocols such as IS-95. Indeed, a typical packet size in the IS-95 protocol is less than the size of a single packet header employed in a typical IP. Moreover, configuring a wireless telephone to communicate using both IP and over-the-air protocols complicates telephone design, adversely strains available resources (e.g., power, computing cycles, coding, and so on), and increases costs. [0006]
  • Nonetheless, the present invention understands that it would be desirable to enable wireless telephone communication using an infrastructure that transmits data in accordance with IP principles. With the above considerations in mind, the present invention provides the solutions disclosed below. [0007]
  • SUMMARY OF THE INVENTION
  • A voice over Internet (VOIP) system includes plural access points communicating with wireless communication devices using a wireless communication device over-the-air protocol that is different from Internet protocol (IP). Each wireless communication device transmits frames of information, and a first access point undertakes frame selection for a first communication device. A second access point assumes frame selection for the first communication device when a predetermined threshold is reached. [0008]
  • In a preferred embodiment, the wireless communication device protocol is a code division multiple access (CDMA) protocol, and each first and second access point is a respective first and second CDMA access point (CAP). In a particularly preferred, non-limiting embodiment, the access point is a base station (BTS), enhanced with the logic described herein, and the infrastructure need not include a base station controller (BSC). [0009]
  • As set forth in greater detail below, the preferred implementation distributes a selector functionality over the CAPs. The functionality that is distributed over the CAPs can be thought of as a selector entity that receives first communication device frames from the first CAP when a first threshold is reached, and monitors frame selection by the first CAP for the first communication device. Moreover, a selector entity assumes frame selection for the first communication device when a second threshold is reached. At this point, the second CAP proposes frame selections for the first communication device and forwards the frame selections to the selector entity for monitoring thereby. When the selector entity determines that frame selections from the second CAP are within a predetermined correctness threshold, the selector entity causes the second CAP to assume frame selection for the first communication device. [0010]
  • In another aspect, a method for frame selection in a wireless communication device infrastructure includes establishing communication between at least a first base station (BTS) and at least one wireless communication device using a non-Internet protocol (IP) over-the-air (OTA) protocol. The first base station is one of a plurality of base stations in an infrastructure. The method includes selecting frames from the wireless communication device at the first base station (BTS), and then selecting frames from the wireless communication device at a second base station (BTS). [0011]
  • In still another aspect, a computer program product includes logic means for dynamically establishing a selector base station (BTS) in a wireless telephony infrastructure that uses IP. Logic means establish CDMA over-the-air communication between at least one base station in the infrastructure and a CDMA wireless communication device. Also, logic means hand off the selecting of frames of information from the communication device from the selector base station to a substitute base station upon reaching a threshold. [0012]
  • In another aspect, a communication system includes at least two wireless endpoints configured for CDMA communication with a wireless communication device. The endpoints communicate with each other using IP. At least a first one of the endpoints is dynamically selected as a selector endpoint that undertakes a frame selection service for the wireless communication device and that undertakes handoff assistance for transferring frame selection from the selector endpoint to a substitute endpoint in accordance with a handoff algorithm. [0013]
  • In yet another aspect, a voice over Internet (VOIP) system includes plural access points communicating with plural wireless communication devices using a wireless communication device over-the-air protocol that is different from Internet protocol (IP). Each wireless communication device transmits frames of information, and at least one access point undertakes frame selection, including the addition and subtraction of access point sectors to a call. [0014]
  • The details of the present invention, both as to its structure and operation, can best be understood in reference to the accompanying drawings, in which like reference numerals refer to like parts, and in which: [0015]
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a block diagram of one preferred implementation of the wireless telephone system of the present invention; [0016]
  • FIG. 2 is a flow chart of the logic for frame selection at one of the CDMA Access Points (CAP) of the present invention; and [0017]
  • FIG. 3 is a flow chart of the logic for handing off frame selection between CDMA access points (CAPs). [0018]
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Referring initially to FIG. 1, a system is shown, generally designated [0019] 10, for effecting communication between a target wireless communication device 12 such as but not limited to a telephone that does not support Internet Protocol (IP) and a telephony infrastructure 14 that does support IP. This invention is directed to distributing the frame selection and handoff functionality of a selector entity among plural base stations.
  • By “does not support VOIP” or “does not support IP” is meant that the device [0020] 12 either has no IP or VOIP capability, or that it has such capability but for improved performance uses a standard over the air (OTA) protocol such as a spread spectrum scheme like CDMA or WCDMA or other wireless protocol such as but not limited to TDMA, UMTS, TD-SCDMA, etc. to communicate with the infrastructure 14. In one non-limiting embodiment the device 12 is a mobile telephone made by Kyocera, Samsung, or other manufacturer that uses Code Division Multiple Access (CDMA) principles and CDMA over-the-air (OTA) communication air interface and includes protocols such as defined in but not limited IS-95A, IS-95B, UCDMA, IS-2000, and others to communicate with the infrastructure 14.
  • For instance, the wireless communication systems to which the present invention can apply, in amplification to those noted above, include Personal Communications Service (PCS) and cellular systems, such as Analog Advanced Mobile Phone System (AMPS) and the following digital systems: CDMA, Time Division Multiple Access (TDMA), and hybrid systems that use both TDMA and CDMA technologies. A CDMA cellular system is described in the Telecommunications Industry Association/Electronic Industries Association (TIA/EIA) Standard IS-95. Combined AMPS and CDMA systems are described in TIA/EIA Standard IS-98. Other communications systems are described in the International Mobile Telecommunications System 2000/Universal Mobile Telecommunications Systems (IMT-2000/UM), standards covering what are referred to as wideband CDMA (WCDMA), cdma2000 (such as cdma2000 1× or 3× standards, for example) or TD-SCDMA. [0021]
  • The present invention applies to any wireless communication device [0022] 12; for illustration it will be assumed that the device 12 is a telephone 12. In general, wireless communication devices to which the present invention applies may include but are not limited to a wireless handset or telephone, a cellular phone, a data transceiver, or a paging and position determination receiver, and can be hand-held, or portable as in vehicle-mounted (including cars, trucks, boats, planes, trains), as desired. However, while wireless communication devices are generally viewed as being mobile, it is to be understood that the present invention can be applied to “fixed” units in some implementations. Also, the present invention applies to data modules or modems used to transfer voice and/or data information including digitized video information, and may communicate with other devices using wired or wireless links. Further, commands might be used to cause modems or modules to work in a predetermined coordinated or associated manner to transfer information over multiple communication channels. Wireless communication devices are also sometimes referred to as user terminals, mobile stations, mobile units, subscriber units, mobile radios or radiotelephones, wireless units, or simply as “users” and “mobiles” in some communication systems.
  • As shown in FIG. 1, the wireless telephone [0023] 12 communicates with at least one first infrastructure component 16. The first component 16 is a code division multiple access (CDMA) access point (CAP), and preferably is a base station (BTS). As intended herein, the BTS does not communicate with a base station controller (BSC) that is external to the BTS, i.e., the infrastructure 14 does not contain a BSC. Less desirably, a BSC can be included in the infrastructure, but with the below-disclosed frame selection function being undertaken by a BTS.
  • A second CAP [0024] 18 is also established by a BTS of the infrastructure 14. While for clarity of disclosure FIG. 1 shows only two CAP 16, 18, it is to be understood that more than two CAPs can be incorporated into the system 10. In any case, the functions of frame selection and handoff control are distributed among the CAP 16, 18.
  • In the presently preferred embodiment, communication within the infrastructure [0025] 14 is via Internet Protocol (IP). The CAPs 16, 18 thus communicate with wireless telephones 12 using OTA protocol, preferably using CDMA, but communicate internally to the infrastructure 14 using IP, thereby relieving the wireless telephone 12 from having to support IP. Also, by using IP internally to the infrastructure 14 and OTA protocol to the telephone 12, the advantages of using IP internal to the infrastructure 14 are realized, whereas the advantages of OTA protocol in wireless communication to the telephone 12 are preserved to maximize the over-the-air capacity of the system 10. Accordingly, the CAPs 16, 18 can be thought of as virtual IP endpoints, with the actual communication endpoint being the telephone 12.
  • FIG. 1 further shows that the target wireless telephone [0026] 12 can also communicate with communication devices outside the infrastructure 14. Specifically, the infrastructure 14 can include a VOIP gateway for communicating, in accordance with principles known in the art, with a public switch telephone network (PSTN) 20. The communication between the VOIP gateway and the PSTN 20 can be via a signalling protocol such as ISUP using a physical system such as SS7. In turn, the PSTN includes one or more landline devices such as telephones or modems, to complete the communication pathway between the target wireless telephone 12 and the landline devices.
  • Additionally, the target wireless telephone [0027] 12 can communicate with the Internet 22, including Internet-based communication devices such as personal computers (PC) or other computers, via the infrastructure 14. Still further, the infrastructure 14 can communicate with wireless telephone systems 24 that are outside the infrastructure 14. Communication between the infrastructure 14 and the other wireless/cellular systems 24 can be via IS-41 protocol or IP.
  • With the above overview of the present architecture in mind, it is to be understood that the present logic is executed on the architecture shown in FIG. 1 in accordance with the flow chart discussed below. The flow charts herein illustrate the structure of the logic of the present invention as embodied in computer program software. Those skilled in the art will appreciate that the flow charts illustrate the structures of logic elements, such as computer program code elements or electronic logic circuits, that function according to this invention. Manifestly, the invention is practiced in its essential embodiment by a machine component that renders the logic elements in a form that instructs a digital processing apparatus (that is, a computer) to perform a sequence of function steps corresponding to those shown. [0028]
  • In other words, the logic may be embodied by a computer program that is executed by a processor within, e.g., the CAPs [0029] 16 and/or 18 as a series of computer-executable instructions. These instructions may reside, for example, in RAM or on a hard drive or optical drive, or the instructions may be stored on magnetic tape, electronic read-only memory, or other appropriate data storage device.
  • Now referring to FIG. 2, the logic of the present invention in selecting frames is shown. Commencing at step [0030] 26, once communication using an appropriate over-the-air (OTA) protocol is established between the telephone 12 and the first CAP 16, i.e., between the telephone 12 and the virtual IP endpoint of the present invention, the CAPs 16, 18 negotiate among themselves or otherwise establish which CAP will initially function as the frame selector CAP. That is, the CAPs can determine which one will have frame selecting responsibility for the telephone 12 when the telephone 12 logs into the infrastructure 14. Frame selection also controls the addition of base station/CAP sectors to a call as a mobile device 12 moves. Moreover, the frame selection CAP can assume the below-described handoff function, or less preferably another CAP can be assigned that function.
  • For instance, when the pilot signal is received from the telephone [0031] 12 by only a single CAP, that CAP assumes frame selection responsibility for the telephone, and informs the infrastructure 14 of this. On the other hand, when two or more CAPs initially detect the telephone 12, the CAPs can use a negotiation protocol to determine which CAP will undertake frame selection. In one non-limiting embodiment used for illustration, the negotiation protocol can include designating the CAP initially receiving the strongest signal from the telephone 12 as the frame selector for the telephone 12. Determining a frame selector CAP can thus be done dynamically as the telephone 12 logs into the infrastructure 14.
  • In any case, when a wireless device [0032] 12 establishes communication with a selector CAP, the selector CAP assigns the device 12 a temporary IP address for all call setup functions involving other communication endpoints. When an endpoint requests a resource from an additional CAP or is handed off thereto, the selector CAP associates a second IP address (such as an IP-port number pair), and disseminates this second IP address to the candidate CAP only. All IP packets from the endpoint arriving at the candidate CAP are delivered to the second IP address, while all call setup requests are delivered to the selector CAP. Additional CAP can be treated similarly. The above-described multi-address feature supports frame selection and handoff described below.
  • Proceeding to step [0033] 28, the selector CAP directs other CAPs in the infrastructure 14 to forward all reverse-link frames (i.e., frames representing information transmitted by the telephone 12) to the selector CAP. At step 29, the selector CAP undertakes frame selection in accordance with frame selection principles known in the art to select the “best” frame from the various CAPs to be the frame for the call. Moreover, at step 30 the selector CAP sends forward link frames (i.e., frames intended for the telephone 12) to all CAPs (i.e., to all BTS) that are participating in the call, for transmission thereof to the telephone 12.
  • In the preferred IP implementation of the infrastructure [0034] 14, when communication is established, OTA packets such as OTA voice packets from the wireless telephone 12 are transformed or otherwise converted to IP at the virtual IP endpoints, i.e., at the CAPs 16, 18, etc. that are participating in the call. To make this transformation, the contents of the OTA voice packets are rearranged as appropriate to conform to IP packet requirements. The information in IP is sent through the infrastructure 14 toward the recipient.
  • Likewise, IP packets representing information intended for the telephone [0035] 12 move through the infrastructure 14 and are converted to OTA packets by the virtual IP endpoints (CAPs). The OTA packets are sent to the telephone 12. The transformation from IP to OTA protocol is the reverse of the process for converting OTA packets to IP packets, i.e., each IP packet might be separated into a set of smaller OTA packets as appropriate to conform to the OTA protocol used by the telephone 12.
  • The present invention recognizes that it might be desirable to hand off the frame selection process between CAPs as the telephone moves between CAPs. The present invention further recognizes that it would be desirable to reduce “dropped” calls as frame selection is handed off between CAPs. With these critical observations in mind, attention is now drawn to the logic flow chart of FIG. 3. [0036]
  • Commencing at step [0037] 40, the first CAP 16 is initially selected as a frame selector CAP for the wireless telephone 12. The first CAP 16 can be the first BTS of the infrastructure 14 that detects the wireless telephone 12. The first CAP 16 performs frame selection in accordance with CDMA frame selection principles known in the art.
  • Moving to decision diamond [0038] 42, it is determined whether a first threshold is reached. In one non-limiting exemplary embodiment, the first threshold can be a predetermined pilot channel signal strength provided from the telephone 12 and indicating a signal strength from the second CAP 18. Or, the first threshold can be a predetermined pilot channel signal strength provided from the second CAP 18 and indicating a signal strength from the telephone 12. Or yet again, the first threshold can be another type of signal strength or other network parameter.
  • When the first threshold is reached, the process proceeds to step [0039] 44, wherein the first CAP 16 continues frame selection, and also forwards both all frames received and “best” frame selections to a selector entity, which can be a software or hardware-implemented entity at the selector CAP or other CAP. That is, the handoff functionality of a selector entity, formerly centralized at a base station controller (BSC), is distributed among the CAP in the present invention. Thus, the “selector entity” referred to herein is implemented by one or more CAP, and indeed the functionality of the selector entity can move from CAP to CAP just as frame selection is distributed.
  • The selector entity can be incorporated anywhere in the infrastructure [0040] 14, and can be implemented by hardware or software. In any case, the selector entity, at step 46, informs the second CAP 18 to send its frames from the telephone 12 to the selector entity, instead of to the first CAP 16. The second CAP 18 makes this change simply by changing the IP address of the frames to match the IP address of the selector entity. The selector entity can then relay the frames to the first CAP 16 to support continued frame selection at the first CAP 16, while simultaneously monitoring frame selection as reported back by the first CAP 16.
  • The process then monitors for the occurrence of a second threshold. this step of the process is indicated at decision diamond [0041] 48 in FIG. 3. The second threshold can be, e.g., a higher predetermined pilot channel strength than the first threshold. When the second threshold is reached, the selector entity assumes frame selection and halts the frame selection process by the first CAP 16 at step 50. Moreover, the selector entity informs the second CAP 18 to propose “best” frame selections while continuing to forward frames to the selector entity, and the selector entity monitors the proposed frame selections from the second CAP 18.
  • When the propose frame selections are “correct” within a predetermined correctness threshold, as indicated at decision diamond [0042] 52, the selector entity causes the second CAP 18 to assume frame selection at step 54. The selector entity then halts its own frame selection and relieves the second CAP 18 from forwarding frames to the selector entity. The above logic essentially effects a “soft” handoff of the frame selection function from the first CAP 16 to the second CAP 18, thereby reducing the likelihood of dropped calls as the telephone moves between the CAPs 16, 18.
  • While the particular SYSTEM AND METHOD FOR FRAME SELECTION IN IP-BASED CDMA NETWORK as herein shown and described in detail is fully capable of attaining the above-described objects of the invention, it is to be understood that it is the presently preferred embodiment of the present invention and is thus representative of the subject matter which is broadly contemplated by the present invention, that the scope of the present invention fully encompasses other embodiments which may become obvious to those skilled in the art, and that the scope of the present invention is accordingly to be limited by nothing other than the appended claims, in which reference to an element in the singular is not intended to mean “one and only one” unless explicitly so stated, but rather “one or more”. All structural and functional equivalents to the elements of the above-described preferred embodiment that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the present claims. Moreover, it is not necessary for a device or method to address each and every problem sought to be solved by the present invention, for it to be encompassed by the present claims. [0043]
  • Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. No claim element herein is to be construed under the provisions of 35 U.S.C. § 112, sixth paragraph, unless the element is expressly recited using the phrase “means for” or, in the case of a method claim, the element is recited as a “step” instead of an “act”.[0044]

Claims (49)

We claim:
1. A voice over Internet (VOIP) system, comprising:
plural access points communicating with plural wireless communication devices using a wireless communication device over-the-air protocol different from Internet protocol (IP),
each wireless communication device transmitting frames of information, at least a first access point undertaking selection functionality including frame selection and handoff control.
2. The system of claim 1, wherein the selection functionality is undertaken for at least a first communication device, and at least a second access point assumes frame selection for the first communication device when a predetermined threshold is reached.
3. The system of claim 2, wherein the wireless communication device protocol is a code division multiple access (CDMA) protocol, and each first and second access point is a respective first and second CDMA access point (CAP).
4. The system of claim 2, wherein the access point is a base station (BTS).
5. The system of claim 2, wherein the infrastructure does not include a base station controller (BSC) external to any access point and communicating therewith.
6. The system of claim 2, comprising a selector entity in communication with the CAPs.
7. The system of claim 6, wherein the selector entity receives first communication device frames from the first CAP when a first threshold is reached, the selector entity monitoring frame selection by the first CAP for the first communication device.
8. The system of claim 7, wherein the selector entity assumes frame selection for the first communication device when a second threshold is reached, the second CAP proposing frame selections for the first communication device and forwarding the frame selections to the selector entity for monitoring thereby.
9. The system of claim 8, wherein the selector entity determines whether frame selections from the second CAP are within a predetermined correctness threshold, and if so, causing the second CAP to assume frame selection for the first communication device.
10. A method for frame selection in a wireless communication device infrastructure, comprising:
establishing communication between at least a first base station (BTS) and at least one wireless communication device using a non-Internet protocol (IP) over-the-air (OTA) protocol, the first base station being one of a plurality of base stations in an infrastructure;
selecting frames from the wireless communication device at the first base station (BTS); then
selecting frames from the wireless communication device at a second base station (BTS).
11. The method of claim 10, further comprising:
receiving first communication device frames from the first BTS at a selector entity when a first threshold is reached.
12. The method of claim 11, further comprising:
monitoring frame selection by the first BTS for the first communication device at the selector entity.
13. The method of claim 12, further comprising:
assuming frame selection for the first communication device at the selector entity when a second threshold is reached.
14. The method of claim 13, further comprising:
proposing frame selections for the first communication device at the second BTS; and
forwarding the frame selections to the selector entity for monitoring thereby.
15. The method of claim 14, further comprising determining whether frame selections from the second BTS are within a predetermined correctness threshold.
16. The method of claim 15, further comprising causing the second BTS to assume frame selection for the first communication device when frame selections from the second BTS are within a predetermined correctness threshold.
17. A computer program product, comprising:
means for dynamically establishing a selector base station (BTS) in a wireless telephony infrastructure, the infrastructure using IP;
means for establishing CDMA over-the-air communication between at least one base station in the infrastructure and a CDMA wireless communication device; and
means for handing off the selecting of frames of information from the communication device from the selector base station to a substitute base station upon reaching a threshold.
18. The product of claim 17, wherein the means for handing off causes the substitute base station to assume frame selection for the first communication device when frame selections from the substitute base station are within a predetermined correctness threshold. The product of claim 18, further comprising means for receiving first communication device frames from the selector base station at a selector entity when a first threshold is reached.
20. The product of claim 19, further comprising:
means for monitoring frame selection by the selector base station for the first communication device at the selector entity.
21. The product of claim 20, further comprising:
means for assuming frame selection for the first communication device at the selector entity when a second threshold is reached.
22. The product of claim 21, further comprising:
means for proposing frame selections for the first communication device at the substitute base station; and
means for forwarding the frame selections to the selector entity for monitoring thereby.
23. The product of claim 22, further comprising means for determining whether frame selections from the substitute base station are within a predetermined correctness threshold.
24. A communication system, comprising:
at least two communication endpoints configured for CDMA communication with a wireless communication device;
the endpoints communicating with each other using IP;
at least a first one of the endpoints being dynamically selected as a selector endpoint;
the selector endpoint undertaking a frame selection service for the wireless communication device; and
a selector entity transferring frame selection from the selector endpoint to a substitute endpoint in accordance with a handoff algorithm.
25. The system of claim 24, wherein the handoff algorithm includes:
receiving first communication device frames from the selector endpoint at a selector entity when a first threshold is reached.
26. The system of claim 25, wherein the algorithm further comprises:
monitoring frame selection by the selector endpoint for the first communication device at the selector entity.
27. The system of claim 26, wherein the algorithm further comprises:
assuming frame selection for the first communication device at the selector entity when a second threshold is reached.
28. The system of claim 27, wherein the algorithm further comprises:
proposing frame selections for the first communication device at the substitute endpoint; and
forwarding the frame selections to the selector entity for monitoring thereby.
29. The system of claim 28, wherein the algorithm further comprises determining whether frame selections from the substitute endpoint are within a predetermined correctness threshold.
30. The system of claim 29, wherein the algorithm further comprises causing the substitute endpoint to assume frame selection for the first communication device when frame selections from the substitute endpoint are within a predetermined correctness threshold.
31. A voice over Internet (VOIP) system, comprising:
plural access points communicating with plural wireless communication devices using a wireless communication device over-the-air protocol different from Internet protocol (IP), each wireless communication device transmitting frames of information, at least one access point undertaking frame selection, including the addition and subtraction of access point sectors to a call.
32. The system of claim 31, wherein the wireless communication device protocol is a code division multiple access (CDMA) protocol, and each access point is a CDMA access point (CAP).
33. The system of claim 31, wherein the access point is a base station (BTS).
34. The system of claim 31, wherein the infrastructure does not include a base station controller (BSC) external to any access point and communicating therewith.
35. The system of claim 31, wherein the access point converts OTA protocol packets to IP packets.
36. The system of claim 31, wherein the access point converts IP packets to OTA protocol packets.
37. The system of claim 31, wherein the access point is a first access point, and the first access point directs at least a second access point in the infrastructure to forward, to the first access point, reverse-link frames received by the second access point from the wireless communication device.
38. The system of claim 31, wherein the access point is a first access point, and the first access point sends to at least a second access point in the infrastructure forward link frames to be sent by the second access point to the communication device.
39. The system of claim 31, wherein the access point is a first access point, and the first access point is dynamically established from among the plural access points.
40. A method for frame selection in a wireless communication device infrastructure, comprising:
establishing communication between at least a first base station (BTS) and at least one wireless communication device using a non-Internet protocol (IP) over-the-air (OTA) protocol, the first base station being one of a plurality of base stations in an infrastructure, wherein no base station communicates with a base station controller (BSC) external to a base station;
selecting frames from the wireless communication device at the first base station (BTS).
41. The method of claim 40, wherein the selecting act includes dynamically establishing base station sectors during a call.
42. The method of claim 41, further comprising:
directing, at the first base station, at least a second base station to forward, to the first base station, reverse-link frames received by the second base station from the wireless communication device.
43. The method of claim 41, further comprising:
sending, from the first base station to at least a second base station, reverse-link frames received by the first base station from the wireless communication device.
44. The method of claim 40, further comprising dynamically determining a frame selector base station from among the plurality of base stations.
45. The method of claim 40, wherein at least one base station converts OTA protocol packets to IP packets and IP packets to OTA protocol packets.
46. The method of claim 40, comprising communicating within the infrastructure using IP.
47. The system of claim 1, wherein the wireless communication device is assigned a first IP address corresponding to a first access point and a second IP address corresponding to a second access point.
48. The method of claim 10, comprising assigning the wireless communication device a first IP address corresponding to the first base station and a second IP address corresponding to the second base station.
49. The product of claim 17, further comprising:
means for assigning the communication device a first IP address corresponding to the selector base station and a second IP address corresponding to the substitute base station.
50. The system of claim 24, wherein the wireless communication device is assigned a first IP address corresponding to the selector endpoint and a second IP address corresponding to the substitute endpoint.
US09/916,047 2001-07-25 2001-07-25 System and method for frame selection in IP-based CDMA network Abandoned US20030021260A1 (en)

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BR0211444A BR0211444A (en) 2001-07-25 2002-07-25 System and method for frame selection on an ip-based cdma network
KR10-2004-7001101A KR20040018511A (en) 2001-07-25 2002-07-25 System and method for frame selection in ip-based cdma network
IL16004002A IL160040D0 (en) 2001-07-25 2002-07-25 System and method for frame selection in ip-based cdma network
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KR20040018511A (en) 2004-03-03
WO2003010908A1 (en) 2003-02-06
US20050201329A1 (en) 2005-09-15
BR0211444A (en) 2004-11-09
US7936718B2 (en) 2011-05-03

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