Source: http://www.google.com/patents/US7602749?dq=%22daniel+j+shapiro%22
Timestamp: 2017-03-24 00:17:13
Document Index: 799372367

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Patent US7602749 - Fast acquisition of traffic channels for a highly variable data rate reverse ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA service option overlay for a CDMA wireless communication in which multiple allocatable subchannels are defined on a reverse link by assigning different code phases of a given long pseudonoise (PN) code to each subchannel. The instantaneous bandwidth needs of each on-line subscriber unit are then met...http://www.google.com/patents/US7602749?utm_source=gb-gplus-sharePatent US7602749 - Fast acquisition of traffic channels for a highly variable data rate reverse link of a CDMA wireless communication systemAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7602749 B2Publication typeGrantApplication numberUS 10/179,121Publication dateOct 13, 2009Filing dateJun 24, 2002Priority dateJun 1, 1998Fee statusPaidAlso published asCA2333654A1, CA2333654C, CA2636713A1, CA2636713C, CA2834031A1, CA2834031C, CN1257654C, CN1304625A, CN1882184A, DE69929050D1, DE69929050T2, EP1084587A2, EP1084587B1, EP1631113A2, EP1631113A3, EP1631113B1, EP2262177A1, EP2262177B1, US6222832, US6452913, US6678260, US6707804, US6928064, US6940842, US7480280, US7746830, US8139546, US8792458, US20010002904, US20020054581, US20020163898, US20040208147, US20040213176, US20050249168, US20050259624, US20100208708, US20130201962, WO1999063682A2, WO1999063682A3Publication number10179121, 179121, US 7602749 B2, US 7602749B2, US-B2-7602749, US7602749 B2, US7602749B2InventorsJames A. Proctor, Jr.Original AssigneeInterdigital CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (107), Non-Patent Citations (65), Referenced by (7), Classifications (72), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetFast acquisition of traffic channels for a highly variable data rate reverse link of a CDMA wireless communication system
US 7602749 B2Abstract
A service option overlay for a CDMA wireless communication in which multiple allocatable subchannels are defined on a reverse link by assigning different code phases of a given long pseudonoise (PN) code to each subchannel. The instantaneous bandwidth needs of each on-line subscriber unit are then met by dynamically allocating none, one, or multiple subchannels on an as needed basis for each network layer connection. The system efficiently provides a relatively large number of virtual physical connections between the subscriber units and the base stations on the reverse link for extended idle periods such as when computers connected to the subscriber units are powered on, but not presently actively sending or receiving data. These maintenance subchannels permit the base station and the subscriber units to remain in phase and time synchronism. This in turn allows fast acquisition of additional subchannels as needed by allocating new code phase subchannels. Preferably, the code phases of the new channels are assigned according to a predetermined code phase relationship with respect to the code phase of the corresponding maintenance subchannel.
1. A code division multiple access (CDMA) user device comprising:
a controller configured to control a CDMA transceiver such that a CDMA connection with a network is established in accordance with a protocol architecture, the protocol architecture having a plurality of protocol layers including a physical layer, a CDMA control channel is established, data is transmitted over allocable code channels wherein the code channels are divided in time by radio frames that are further subdivided into sub-frames, code channels are allocated on a sub-frame basis to support the transmitted data wherein allocation of code channels includes adding and removing code channels assigned to the CDMA user device, and the network connection is maintained when the CDMA user device does not have any allocated code channels to transmit the data, wherein a state of at least one of the plurality of protocol layers above the physical layer is maintained during the CDMA connection after all of the allocable code channels assigned to the CDMA user device are released.
2. The CDMA user device according to claim 1 wherein the sub-frame includes at least one time slot.
3. The CDMA user device according to claim 1 wherein the CDMIA transceiver is configured to operate over a plurality of allocable radio frequency channels.
4. The CDMA user device according to claim 1 wherein the CDMA control channel enables the code channels to be reallocated without reestablishing a code phase lock over the CDMA connection when the transceiver is not actively sending data.
5. The CDMA user device according to claim 1 wherein a bandwidth management function is configured for allocating the code channels on an as-needed basis, with the number of allocable code channels being variable during a duration of a communication session.
6. The CDMA user device according to claim 5 wherein the bandwidth management function is configured to deallocate an initially assigned code channel when there is no data to transmit from the CDMA user device.
7. The CDMA user device according to claim 1 wherein the CDMA transceiver sends a message over the CDMA control channel to facilitate a higher data service rate.
8. The CDMA user device according to claim 1, further comprising:
a modem configured to establish a communications session over the CDMA connection wherein the modem is configured to convert data and voice signals to a standard format.
9. The CDMA user device according to claim 1 wherein the data includes web browser data which is displayed on the CDMA user device.
This application is a continuation of U.S. application Ser. No. 09/515,487, filed Feb. 29, 2000 now U.S. Pat. No. 6,452,913, entitled “Fast Acquisition of Traffic Channels for a Highly Variable Data Rate Reverse Link of a CDMA Wireless Communication System,” which is a continuation in part of U.S. application Ser. No. 09/088,413 filed Jun. 1, 1998, now U.S. Pat. No. 6,222,832, entitled “Fast Acquisition of Traffic Channels for a Highly Variable Data Rate Reverse Link of a CDMA Wireless Communication System,” which itself is related to a prior pending U.S. patent application Ser. No. 08/992,760 filed Dec. 17, 1997, now U.S. Pat. No. 6,081,536, entitled “Dynamic Bandwidth Allocation to Transmit a Wireless Protocol Across a Code Division Multiple Access (CDMA) Radio Link” and a prior pending U.S. patent application Ser. No. 08/992,759 filed Dec. 17, 1997, now U.S. Pat. No. 6,151,332, entitled “Protocol Conversion and Bandwidth Reduction Technique Providing Multiple nB+D ISDN Basic Rate Interface Links Over a Wireless Code Division Multiple Access Communication System,” and a prior pending U.S. patent application Ser. No. 09/030,049 filed Feb. 24, 1998, now U.S. Pat. No. 6,236,647, entitled “Dynamic Frame Size Adjustment and Selective Reject On a Multi-Link Channel to Improve Effective Throughput and Bit Error Rate,” each of which are assigned to the assignee of the present invention and all five of which are hereby incorporated by reference in their entirety.
There still is no widely available satisfactory solution for providing low cost, high speed access to the Internet, private intranets, and other networks using the existing wireless infrastructure. This situation is most likely an artifact of several unfortunate circumstances. For one, the typical manner of providing high speed data service in the business environment over the wireline network is not readily adaptable to the voice grade service available in most homes or offices. Such standard high speed data services also do not lend themselves well to efficient transmission over standard cellular wireless handsets. Furthermore, the existing cellular network was originally designed only to deliver voice services. As a result, the emphasis in present day digital wireless communication schemes lies with voice, although certain schemes such as CDMA do provide some measure of asymmetrical behavior for the accommodation of data transmission. For example, the data rate on an IS-95 forward traffic channel can be adjusted in increments from 1.2 kbps up to 9.6 kbps for so-called Rate Set 1 and in for increments from 1.8 kbps up to 14.4 kbps for Rate Set 2. On the reverse link traffic channel, however, the data rate is fixed at 4.8 kbps.
What is needed is an efficient scheme for supporting wireless data communication such as from portable computers to computer networks such as the Internet and private intranets using widely available infrastructure. Unfortunately, even the most modern wireless standards in widespread use such as CDMA do not provide adequate structure for supporting the most common activities, such as web page browsing. In the forward link direction, the maximum available channel bandwidth in an IS-95 type CDMA system is only 14.4 kbps. In the reverse link direction, data rates are fixed at 4.8 kbps, meaning that it is possible to support only about 100 subscribers at the same time on a 1.25 MHz bandwidth radio frequency carrier signal.
In addition, the existing CDMA system requires certain operations before a channel can be used. Both access and traffic channels are non-coherently modulated by so-called long code pseudonoise (PN) sequences; therefore, in order for the receiver to work properly it must first be synchronized with the transmitter. The setting up and tearing down of channels therefore requires overhead to perform such synchronization. This overhead results in a noticeable delay to the user of the subscriber unit.
The sharing of channels in both the forward and reverse link directions is therefore an attractive option, especially with the ease of obtaining multiple access with CDMA; additional users can be supported by simply adding additional codes or code phases. Ideally, this subchannel overhead would be minimized so that when additional subchannels need to be allocated to a connection, they are available as rapidly as possible.
It is therefore advantageous to provide the sub-channels in such a way that the lowest possible speed connection is provided on a reverse link while at the same time maintaining efficient and fast ramp-up of additional code phase channels on demand. This in turn would maximize the number of available connections while minimizing the impact on the overall system capacity.
The present invention is a service option overlay for a CDMA wireless communication system which accomplishes the above requirements. In particular, a number of subchannels for a forward link are defined within a single CDMA radio channel bandwidth, such as by assigning different orthogonal codes to each sub-channel. Multiple subchannels are defined on the reverse link by assigning different code phases of a given long pseudonoise (PN) code to each subchannel. The instantaneous bandwidth needs of each on-line subscriber unit are then met by dynamically allocating none, one, or multiple subchannels on an as needed basis for each network layer connection.
The heartbeat messages are preferably sent in time slots formed on the subchannels defined by the code phases. The use of time slotting allows a minimum number of dedicated base station receivers to maintain the idle reverse links. In particular, the reverse channel links are provided using multiple phases of the same long code as well as by assigning a time slot on such code to each subscriber unit. This reduces the overhead of maintaining a large number of connections at the base station.
Because of the time slotted nature of the reverse channel, the base station receiver can also be time shared among the various reverse links. To permit this, during each time slot allocated to a particular subscriber unit, the base station receiver first loads information concerning the last known state of its phase lock such as the last known state of early-late correlators. It then trains the early-late correlators for the required time to ensure that phase lock is still valid, and stores the state of the correlators at the end of the time slot.
The subscriber unit 101 itself consists of an ISDN modem 120, a device referred to herein as the protocol converter 130 that performs the various functions according to the invention including spoofing 132 and bandwidth management 134, a CDMA transceiver 140, and subscriber unit antenna 150. The various components of the subscriber unit 101 may be realized in discrete devices or as an integrated unit. For example, an existing conventional ISDN modem 120 such as is readily available from any number of manufacturers may be used together with existing CDMA transceivers 140. In this case, the unique functions are provided entirely by the protocol converter 130 which may be sold as a separate device. Alternatively, the ISDN modem 120, protocol converter 130, and CDMA transceiver 140 may be integrated as a complete unit and sold as a single subscriber unit device 101. Other types of interface connections such as Ethernet or PCMCIA may be used to connect the computing device to the protocol converter 130.
In contrast to this, the present invention subdivides the available approximately 500 to 600 kbps data rate into a relatively large number of subchannels. In the illustrated example, the bandwidth is divided into sixty-four (64) subchannels 300, each providing an 8 kbps data rate. A given subchannel 300 is physically implemented by encoding a transmission with one of a number of different assignable pseudorandom codes. For example, the 64 subchannels 300 may be defined within a single CDMA RF carrier by using a different orthogonal code for each defined subchannel 300.
A relatively large number, N, such as 1000 individual subscriber units are then supported by using a single long pseudonoise (PN) code in a particular way. First, a number, p, of code phases are selected from the available 242−1 different code phases. The p code phase shifts are then used to provide p subchannels. Next, each of the p subchannels are further divided into s time slots. Therefore, the maximum supportable number of supportable subscriber units, N, is p times s. Use of the same PN code with different phases and time slots provides many different subchannels with permits using a single rake receiver in the base station 104.
In the above mentioned channel allocation scheme, radio resources are expected to be allocated on an as-needed basis. However, consideration must also be given to the fact that normally, in order set up a new CDMA channel, a given reverse link channel must be given time to acquire code phase lock at the receiver. The present invention avoids the need to wait for each channel to acquire code phase lock each time that it is set up by several mechanisms which are describe more fully below. In general, the technique is to send a maintenance signal at a rate which is sufficient to maintain code phase lock for each subchannel even in the absence of data.
To be consistent with certain power control group timing requirements, the time slot duration can be relaxed somewhat. For example, in the IS-95 standard, a power control group timing requirement requires a power output sample from each subscriber unit every 1.25 ms. Even in such an implementation, approximately 1.25 ms/130 μs, or at least 961 time slots can be made available on each code phase carrier.
FIG. 4 is a state diagram for a reverse link bandwidth management function in the subscriber unit. In an idle mode 400, a first state 401 is entered in which the subscriber unit receives a time slot assignment for its idle or fundamental channel in the form of a phase code, p, and a time slot, s.
If, however, the subscriber unit does have data to be sent, then the active mode 450 is entered. In the first state 451 of this mode, if new code phase channels are required, then new code phases are calculated in state 452. Specifically, the subscriber unit knows that it is assigned code phase channels in a predetermined relationship to the code phase channel of its fundamental channel, i.e.,
where Pn+1 is the code phase for the new channel (n+1), and Po is the code phase assigned to the fundamental channel for the particular subscriber. Such a code phase relationship may be, for example, to select uniformly from the available 242 codes, every 242/210'th or every 232'th code phase in a system which is supporting 1024 (210) reverse links.
In a next state 453, the subscriber unit begins transmitting its data on its assigned code phase channels. In state 454, it continues to monitor its internal data buffers and its associated forward access channel to determine when to return to the idle mode 400, to state 451, to determine if new code phase channels must be assigned, or to state 455, where they are deallocated.
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KgUniversal broadband broadcasting* Cited by examinerClassifications U.S. Classification370/335, 370/342, 370/441International ClassificationH04J3/06, H04L12/56, H04W28/20, H04J11/00, H04Q11/04, H04L27/26, H04L7/06, H04W52/02, H04W56/00, H04L1/00, H04W74/00, H04L1/18, H04W28/22, H04B7/212, H04W84/14, H04L25/14, H04B1/707, H04J13/18, H04B1/7075, H04J13/16, H04J13/00, H04B7/216, H04L12/28, H04L1/16, H04W74/04, H04W72/04Cooperative ClassificationH04B2201/70709, H04W84/14, H04B2001/70706, H04Q2213/1327, H04J13/004, H04Q11/0428, H04Q2213/13204, H04W72/044, H04W72/0453, H04W24/00, H04W74/04, H04B2201/70703, H04L1/0007, H04Q2213/13202, H04W72/0446, H04W72/0413, H04Q2213/1336, H04L27/2601, H04W28/20, H04L1/165, H04Q2213/13216, H04B7/2628, H04J13/0022, H04W56/00, H04W56/0045, H04W56/0075, H04B2201/70715, H04L25/14, H04Q2213/13098, H04J13/18, H04L1/1809, H04Q2213/13389, H04Q2213/13209, H04Q2213/13298, H04W76/048, H04W74/00, H04Q2213/13332, H04B1/7075, H04W72/0466, H04J13/16, H04L7/06, H04W28/22, H04B1/70754Legal EventsDateCodeEventDescriptionJul 24, 2003ASAssignmentOwner name: IPR HOLDINGS DELAWARE, INC., PENNSYLVANIAFree format text: SECURITY INTEREST;ASSIGNOR:TANTIVY COMMUNICATIONS, INC.;REEL/FRAME:014289/0207Effective date: 20030722Feb 19, 2004ASAssignmentOwner name: INTERDIGITAL PATENT CORPORATION, DELAWAREFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:INTERDIGITAL ACQUISITION CORPORATION;REEL/FRAME:014351/0777Effective date: 20040218Feb 26, 2004ASAssignmentOwner name: INTERDIGITAL ACQUISITION CORP., DELAWAREFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TANTIVY COMMUNICATIONS, INC.;REEL/FRAME:015000/0141Effective date: 20030730Owner name: INTERDIGITAL PATENT CORPORATION, DELAWAREFree format text: MERGER;ASSIGNOR:INTERDIGITAL ACQUISITION CORP.;REEL/FRAME:015000/0577Effective date: 20040218Owner name: TANTIVY COMMUNICATIONS, INC., DELAWAREFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:INTERDIGITAL PATENT CORPORATION;REEL/FRAME:015017/0577Effective date: 20040225Oct 5, 2010CCCertificate of correctionFeb 23, 2011ASAssignmentOwner name: IPR LICENSING, INC., DELAWAREFree format text: MERGER;ASSIGNOR:TANTIVY COMMUNICATIONS, INC.;REEL/FRAME:025852/0304Effective date: 20101130Jan 2, 2013ASAssignmentOwner name: INTEL CORPORATION, CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IPR LICENSING, INC.;REEL/FRAME:029555/0660Effective date: 20120904Mar 6, 2013FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services